The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_adhoc.c

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    1 /*-
    2  * Copyright (c) 2007-2009 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/10.0/sys/net80211/ieee80211_adhoc.c 246930 2013-02-18 01:37:55Z adrian $");
   29 #endif
   30 
   31 /*
   32  * IEEE 802.11 IBSS 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_adhoc.h>
   59 #include <net80211/ieee80211_input.h>
   60 #ifdef IEEE80211_SUPPORT_SUPERG
   61 #include <net80211/ieee80211_superg.h>
   62 #endif
   63 #ifdef IEEE80211_SUPPORT_TDMA
   64 #include <net80211/ieee80211_tdma.h>
   65 #endif
   66 #include <net80211/ieee80211_sta.h>
   67 
   68 #define IEEE80211_RATE2MBS(r)   (((r) & IEEE80211_RATE_VAL) / 2)
   69 
   70 static  void adhoc_vattach(struct ieee80211vap *);
   71 static  int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   72 static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
   73 static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
   74         int subtype, int, int);
   75 static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
   76         int subtype, int, int);
   77 static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
   78 
   79 void
   80 ieee80211_adhoc_attach(struct ieee80211com *ic)
   81 {
   82         ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
   83         ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
   84 }
   85 
   86 void
   87 ieee80211_adhoc_detach(struct ieee80211com *ic)
   88 {
   89 }
   90 
   91 static void
   92 adhoc_vdetach(struct ieee80211vap *vap)
   93 {
   94 }
   95 
   96 static void
   97 adhoc_vattach(struct ieee80211vap *vap)
   98 {
   99         vap->iv_newstate = adhoc_newstate;
  100         vap->iv_input = adhoc_input;
  101         if (vap->iv_opmode == IEEE80211_M_IBSS)
  102                 vap->iv_recv_mgmt = adhoc_recv_mgmt;
  103         else
  104                 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
  105         vap->iv_recv_ctl = adhoc_recv_ctl;
  106         vap->iv_opdetach = adhoc_vdetach;
  107 #ifdef IEEE80211_SUPPORT_TDMA
  108         /*
  109          * Throw control to tdma support.  Note we do this
  110          * after setting up our callbacks so it can piggyback
  111          * on top of us.
  112          */
  113         if (vap->iv_caps & IEEE80211_C_TDMA)
  114                 ieee80211_tdma_vattach(vap);
  115 #endif
  116 }
  117 
  118 static void
  119 sta_leave(void *arg, struct ieee80211_node *ni)
  120 {
  121         struct ieee80211vap *vap = arg;
  122 
  123         if (ni->ni_vap == vap && ni != vap->iv_bss)
  124                 ieee80211_node_leave(ni);
  125 }
  126 
  127 /*
  128  * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
  129  */
  130 static int
  131 adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  132 {
  133         struct ieee80211com *ic = vap->iv_ic;
  134         struct ieee80211_node *ni;
  135         enum ieee80211_state ostate;
  136 
  137         IEEE80211_LOCK_ASSERT(vap->iv_ic);
  138 
  139         ostate = vap->iv_state;
  140         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  141             __func__, ieee80211_state_name[ostate],
  142             ieee80211_state_name[nstate], arg);
  143         vap->iv_state = nstate;                 /* state transition */
  144         if (ostate != IEEE80211_S_SCAN)
  145                 ieee80211_cancel_scan(vap);     /* background scan */
  146         ni = vap->iv_bss;                       /* NB: no reference held */
  147         switch (nstate) {
  148         case IEEE80211_S_INIT:
  149                 switch (ostate) {
  150                 case IEEE80211_S_SCAN:
  151                         ieee80211_cancel_scan(vap);
  152                         break;
  153                 default:
  154                         break;
  155                 }
  156                 if (ostate != IEEE80211_S_INIT) {
  157                         /* NB: optimize INIT -> INIT case */
  158                         ieee80211_reset_bss(vap);
  159                 }
  160                 break;
  161         case IEEE80211_S_SCAN:
  162                 switch (ostate) {
  163                 case IEEE80211_S_RUN:           /* beacon miss */
  164                         /* purge station table; entries are stale */
  165                         ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
  166                         /* fall thru... */
  167                 case IEEE80211_S_INIT:
  168                         if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
  169                             !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
  170                                 /*
  171                                  * Already have a channel; bypass the
  172                                  * scan and startup immediately.
  173                                  */
  174                                 ieee80211_create_ibss(vap,
  175                                     ieee80211_ht_adjust_channel(ic,
  176                                     vap->iv_des_chan, vap->iv_flags_ht));
  177                                 break;
  178                         }
  179                         /*
  180                          * Initiate a scan.  We can come here as a result
  181                          * of an IEEE80211_IOC_SCAN_REQ too in which case
  182                          * the vap will be marked with IEEE80211_FEXT_SCANREQ
  183                          * and the scan request parameters will be present
  184                          * in iv_scanreq.  Otherwise we do the default.
  185                          */
  186                         if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
  187                                 ieee80211_check_scan(vap,
  188                                     vap->iv_scanreq_flags,
  189                                     vap->iv_scanreq_duration,
  190                                     vap->iv_scanreq_mindwell,
  191                                     vap->iv_scanreq_maxdwell,
  192                                     vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
  193                                 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
  194                         } else
  195                                 ieee80211_check_scan_current(vap);
  196                         break;
  197                 case IEEE80211_S_SCAN:
  198                         /*
  199                          * This can happen because of a change in state
  200                          * that requires a reset.  Trigger a new scan
  201                          * unless we're in manual roaming mode in which
  202                          * case an application must issue an explicit request.
  203                          */
  204                         if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
  205                                 ieee80211_check_scan_current(vap);
  206                         break;
  207                 default:
  208                         goto invalid;
  209                 }
  210                 break;
  211         case IEEE80211_S_RUN:
  212                 if (vap->iv_flags & IEEE80211_F_WPA) {
  213                         /* XXX validate prerequisites */
  214                 }
  215                 switch (ostate) {
  216                 case IEEE80211_S_SCAN:
  217 #ifdef IEEE80211_DEBUG
  218                         if (ieee80211_msg_debug(vap)) {
  219                                 ieee80211_note(vap,
  220                                     "synchronized with %s ssid ",
  221                                     ether_sprintf(ni->ni_bssid));
  222                                 ieee80211_print_essid(vap->iv_bss->ni_essid,
  223                                     ni->ni_esslen);
  224                                 /* XXX MCS/HT */
  225                                 printf(" channel %d start %uMb\n",
  226                                     ieee80211_chan2ieee(ic, ic->ic_curchan),
  227                                     IEEE80211_RATE2MBS(ni->ni_txrate));
  228                         }
  229 #endif
  230                         break;
  231                 default:
  232                         goto invalid;
  233                 }
  234                 /*
  235                  * When 802.1x is not in use mark the port authorized
  236                  * at this point so traffic can flow.
  237                  */
  238                 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  239                         ieee80211_node_authorize(ni);
  240                 /*
  241                  * Fake association when joining an existing bss.
  242                  */
  243                 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
  244                     ic->ic_newassoc != NULL)
  245                         ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
  246                 break;
  247         case IEEE80211_S_SLEEP:
  248                 vap->iv_sta_ps(vap, 0);
  249                 break;
  250         default:
  251         invalid:
  252                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
  253                     "%s: unexpected state transition %s -> %s\n", __func__,
  254                     ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
  255                 break;
  256         }
  257         return 0;
  258 }
  259 
  260 /*
  261  * Decide if a received management frame should be
  262  * printed when debugging is enabled.  This filters some
  263  * of the less interesting frames that come frequently
  264  * (e.g. beacons).
  265  */
  266 static __inline int
  267 doprint(struct ieee80211vap *vap, int subtype)
  268 {
  269         switch (subtype) {
  270         case IEEE80211_FC0_SUBTYPE_BEACON:
  271                 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
  272         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  273                 return 1;
  274         }
  275         return 1;
  276 }
  277 
  278 /*
  279  * Process a received frame.  The node associated with the sender
  280  * should be supplied.  If nothing was found in the node table then
  281  * the caller is assumed to supply a reference to iv_bss instead.
  282  * The RSSI and a timestamp are also supplied.  The RSSI data is used
  283  * during AP scanning to select a AP to associate with; it can have
  284  * any units so long as values have consistent units and higher values
  285  * mean ``better signal''.  The receive timestamp is currently not used
  286  * by the 802.11 layer.
  287  */
  288 static int
  289 adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
  290 {
  291 #define HAS_SEQ(type)   ((type & 0x4) == 0)
  292         struct ieee80211vap *vap = ni->ni_vap;
  293         struct ieee80211com *ic = ni->ni_ic;
  294         struct ifnet *ifp = vap->iv_ifp;
  295         struct ieee80211_frame *wh;
  296         struct ieee80211_key *key;
  297         struct ether_header *eh;
  298         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */   
  299         uint8_t dir, type, subtype, qos;
  300         uint8_t *bssid;
  301         uint16_t rxseq;
  302 
  303         if (m->m_flags & M_AMPDU_MPDU) {
  304                 /*
  305                  * Fastpath for A-MPDU reorder q resubmission.  Frames
  306                  * w/ M_AMPDU_MPDU marked have already passed through
  307                  * here but were received out of order and been held on
  308                  * the reorder queue.  When resubmitted they are marked
  309                  * with the M_AMPDU_MPDU flag and we can bypass most of
  310                  * the normal processing.
  311                  */
  312                 wh = mtod(m, struct ieee80211_frame *);
  313                 type = IEEE80211_FC0_TYPE_DATA;
  314                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  315                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
  316                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
  317                 goto resubmit_ampdu;
  318         }
  319 
  320         KASSERT(ni != NULL, ("null node"));
  321         ni->ni_inact = ni->ni_inact_reload;
  322 
  323         type = -1;                      /* undefined */
  324 
  325         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  326                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  327                     ni->ni_macaddr, NULL,
  328                     "too short (1): len %u", m->m_pkthdr.len);
  329                 vap->iv_stats.is_rx_tooshort++;
  330                 goto out;
  331         }
  332         /*
  333          * Bit of a cheat here, we use a pointer for a 3-address
  334          * frame format but don't reference fields past outside
  335          * ieee80211_frame_min w/o first validating the data is
  336          * present.
  337          */
  338         wh = mtod(m, struct ieee80211_frame *);
  339 
  340         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  341             IEEE80211_FC0_VERSION_0) {
  342                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  343                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  344                     wh->i_fc[0], wh->i_fc[1]);
  345                 vap->iv_stats.is_rx_badversion++;
  346                 goto err;
  347         }
  348 
  349         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  350         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  351         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  352         if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
  353                 if (dir != IEEE80211_FC1_DIR_NODS)
  354                         bssid = wh->i_addr1;
  355                 else if (type == IEEE80211_FC0_TYPE_CTL)
  356                         bssid = wh->i_addr1;
  357                 else {
  358                         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  359                                 IEEE80211_DISCARD_MAC(vap,
  360                                     IEEE80211_MSG_ANY, ni->ni_macaddr,
  361                                     NULL, "too short (2): len %u",
  362                                     m->m_pkthdr.len);
  363                                 vap->iv_stats.is_rx_tooshort++;
  364                                 goto out;
  365                         }
  366                         bssid = wh->i_addr3;
  367                 }
  368                 /*
  369                  * Validate the bssid.
  370                  */
  371                 if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) &&
  372                     !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
  373                         /* not interested in */
  374                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  375                             bssid, NULL, "%s", "not to bss");
  376                         vap->iv_stats.is_rx_wrongbss++;
  377                         goto out;
  378                 }
  379                 /*
  380                  * Data frame, cons up a node when it doesn't
  381                  * exist. This should probably done after an ACL check.
  382                  */
  383                 if (type == IEEE80211_FC0_TYPE_DATA &&
  384                     ni == vap->iv_bss &&
  385                     !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
  386                         /*
  387                          * Beware of frames that come in too early; we
  388                          * can receive broadcast frames and creating sta
  389                          * entries will blow up because there is no bss
  390                          * channel yet.
  391                          */
  392                         if (vap->iv_state != IEEE80211_S_RUN) {
  393                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  394                                     wh, "data", "not in RUN state (%s)",
  395                                     ieee80211_state_name[vap->iv_state]);
  396                                 vap->iv_stats.is_rx_badstate++;
  397                                 goto err;
  398                         }
  399                         /*
  400                          * Fake up a node for this newly
  401                          * discovered member of the IBSS.
  402                          */
  403                         ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2);
  404                         if (ni == NULL) {
  405                                 /* NB: stat kept for alloc failure */
  406                                 goto err;
  407                         }
  408                 }
  409                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  410                 ni->ni_noise = nf;
  411                 if (HAS_SEQ(type)) {
  412                         uint8_t tid = ieee80211_gettid(wh);
  413                         if (IEEE80211_QOS_HAS_SEQ(wh) &&
  414                             TID_TO_WME_AC(tid) >= WME_AC_VI)
  415                                 ic->ic_wme.wme_hipri_traffic++;
  416                         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  417                         if (! ieee80211_check_rxseq(ni, wh)) {
  418                                 /* duplicate, discard */
  419                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  420                                     bssid, "duplicate",
  421                                     "seqno <%u,%u> fragno <%u,%u> tid %u",
  422                                     rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
  423                                     ni->ni_rxseqs[tid] >>
  424                                         IEEE80211_SEQ_SEQ_SHIFT,
  425                                     rxseq & IEEE80211_SEQ_FRAG_MASK,
  426                                     ni->ni_rxseqs[tid] &
  427                                         IEEE80211_SEQ_FRAG_MASK,
  428                                     tid);
  429                                 vap->iv_stats.is_rx_dup++;
  430                                 IEEE80211_NODE_STAT(ni, rx_dup);
  431                                 goto out;
  432                         }
  433                         ni->ni_rxseqs[tid] = rxseq;
  434                 }
  435         }
  436 
  437         switch (type) {
  438         case IEEE80211_FC0_TYPE_DATA:
  439                 hdrspace = ieee80211_hdrspace(ic, wh);
  440                 if (m->m_len < hdrspace &&
  441                     (m = m_pullup(m, hdrspace)) == NULL) {
  442                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  443                             ni->ni_macaddr, NULL,
  444                             "data too short: expecting %u", hdrspace);
  445                         vap->iv_stats.is_rx_tooshort++;
  446                         goto out;               /* XXX */
  447                 }
  448                 if (dir != IEEE80211_FC1_DIR_NODS) {
  449                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  450                             wh, "data", "incorrect dir 0x%x", dir);
  451                         vap->iv_stats.is_rx_wrongdir++;
  452                         goto out;
  453                 }
  454                 /* XXX no power-save support */
  455 
  456                 /*
  457                  * Handle A-MPDU re-ordering.  If the frame is to be
  458                  * processed directly then ieee80211_ampdu_reorder
  459                  * will return 0; otherwise it has consumed the mbuf
  460                  * and we should do nothing more with it.
  461                  */
  462                 if ((m->m_flags & M_AMPDU) &&
  463                     ieee80211_ampdu_reorder(ni, m) != 0) {
  464                         m = NULL;
  465                         goto out;
  466                 }
  467         resubmit_ampdu:
  468 
  469                 /*
  470                  * Handle privacy requirements.  Note that we
  471                  * must not be preempted from here until after
  472                  * we (potentially) call ieee80211_crypto_demic;
  473                  * otherwise we may violate assumptions in the
  474                  * crypto cipher modules used to do delayed update
  475                  * of replay sequence numbers.
  476                  */
  477                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  478                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  479                                 /*
  480                                  * Discard encrypted frames when privacy is off.
  481                                  */
  482                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  483                                     wh, "WEP", "%s", "PRIVACY off");
  484                                 vap->iv_stats.is_rx_noprivacy++;
  485                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
  486                                 goto out;
  487                         }
  488                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  489                         if (key == NULL) {
  490                                 /* NB: stats+msgs handled in crypto_decap */
  491                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
  492                                 goto out;
  493                         }
  494                         wh = mtod(m, struct ieee80211_frame *);
  495                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  496                 } else {
  497                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
  498                         key = NULL;
  499                 }
  500 
  501                 /*
  502                  * Save QoS bits for use below--before we strip the header.
  503                  */
  504                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  505                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  506                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  507                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
  508                 } else
  509                         qos = 0;
  510 
  511                 /*
  512                  * Next up, any fragmentation.
  513                  */
  514                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  515                         m = ieee80211_defrag(ni, m, hdrspace);
  516                         if (m == NULL) {
  517                                 /* Fragment dropped or frame not complete yet */
  518                                 goto out;
  519                         }
  520                 }
  521                 wh = NULL;              /* no longer valid, catch any uses */
  522 
  523                 /*
  524                  * Next strip any MSDU crypto bits.
  525                  */
  526                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  527                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  528                             ni->ni_macaddr, "data", "%s", "demic error");
  529                         vap->iv_stats.is_rx_demicfail++;
  530                         IEEE80211_NODE_STAT(ni, rx_demicfail);
  531                         goto out;
  532                 }
  533 
  534                 /* copy to listener after decrypt */
  535                 if (ieee80211_radiotap_active_vap(vap))
  536                         ieee80211_radiotap_rx(vap, m);
  537                 need_tap = 0;
  538 
  539                 /*
  540                  * Finally, strip the 802.11 header.
  541                  */
  542                 m = ieee80211_decap(vap, m, hdrspace);
  543                 if (m == NULL) {
  544                         /* XXX mask bit to check for both */
  545                         /* don't count Null data frames as errors */
  546                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  547                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  548                                 goto out;
  549                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  550                             ni->ni_macaddr, "data", "%s", "decap error");
  551                         vap->iv_stats.is_rx_decap++;
  552                         IEEE80211_NODE_STAT(ni, rx_decap);
  553                         goto err;
  554                 }
  555                 eh = mtod(m, struct ether_header *);
  556                 if (!ieee80211_node_is_authorized(ni)) {
  557                         /*
  558                          * Deny any non-PAE frames received prior to
  559                          * authorization.  For open/shared-key
  560                          * authentication the port is mark authorized
  561                          * after authentication completes.  For 802.1x
  562                          * the port is not marked authorized by the
  563                          * authenticator until the handshake has completed.
  564                          */
  565                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  566                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  567                                     eh->ether_shost, "data",
  568                                     "unauthorized port: ether type 0x%x len %u",
  569                                     eh->ether_type, m->m_pkthdr.len);
  570                                 vap->iv_stats.is_rx_unauth++;
  571                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  572                                 goto err;
  573                         }
  574                 } else {
  575                         /*
  576                          * When denying unencrypted frames, discard
  577                          * any non-PAE frames received without encryption.
  578                          */
  579                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  580                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
  581                             eh->ether_type != htons(ETHERTYPE_PAE)) {
  582                                 /*
  583                                  * Drop unencrypted frames.
  584                                  */
  585                                 vap->iv_stats.is_rx_unencrypted++;
  586                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
  587                                 goto out;
  588                         }
  589                 }
  590                 /* XXX require HT? */
  591                 if (qos & IEEE80211_QOS_AMSDU) {
  592                         m = ieee80211_decap_amsdu(ni, m);
  593                         if (m == NULL)
  594                                 return IEEE80211_FC0_TYPE_DATA;
  595                 } else {
  596 #ifdef IEEE80211_SUPPORT_SUPERG
  597                         m = ieee80211_decap_fastframe(vap, ni, m);
  598                         if (m == NULL)
  599                                 return IEEE80211_FC0_TYPE_DATA;
  600 #endif
  601                 }
  602                 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
  603                         ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
  604                 else
  605                         ieee80211_deliver_data(vap, ni, m);
  606                 return IEEE80211_FC0_TYPE_DATA;
  607 
  608         case IEEE80211_FC0_TYPE_MGT:
  609                 vap->iv_stats.is_rx_mgmt++;
  610                 IEEE80211_NODE_STAT(ni, rx_mgmt);
  611                 if (dir != IEEE80211_FC1_DIR_NODS) {
  612                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  613                             wh, "data", "incorrect dir 0x%x", dir);
  614                         vap->iv_stats.is_rx_wrongdir++;
  615                         goto err;
  616                 }
  617                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  618                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  619                             ni->ni_macaddr, "mgt", "too short: len %u",
  620                             m->m_pkthdr.len);
  621                         vap->iv_stats.is_rx_tooshort++;
  622                         goto out;
  623                 }
  624 #ifdef IEEE80211_DEBUG
  625                 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
  626                     ieee80211_msg_dumppkts(vap)) {
  627                         if_printf(ifp, "received %s from %s rssi %d\n",
  628                             ieee80211_mgt_subtype_name[subtype >>
  629                                 IEEE80211_FC0_SUBTYPE_SHIFT],
  630                             ether_sprintf(wh->i_addr2), rssi);
  631                 }
  632 #endif
  633                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  634                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  635                             wh, NULL, "%s", "WEP set but not permitted");
  636                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  637                         goto out;
  638                 }
  639                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
  640                 goto out;
  641 
  642         case IEEE80211_FC0_TYPE_CTL:
  643                 vap->iv_stats.is_rx_ctl++;
  644                 IEEE80211_NODE_STAT(ni, rx_ctrl);
  645                 vap->iv_recv_ctl(ni, m, subtype);
  646                 goto out;
  647 
  648         default:
  649                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  650                     wh, "bad", "frame type 0x%x", type);
  651                 /* should not come here */
  652                 break;
  653         }
  654 err:
  655         ifp->if_ierrors++;
  656 out:
  657         if (m != NULL) {
  658                 if (need_tap && ieee80211_radiotap_active_vap(vap))
  659                         ieee80211_radiotap_rx(vap, m);
  660                 m_freem(m);
  661         }
  662         return type;
  663 }
  664 
  665 static int
  666 is11bclient(const uint8_t *rates, const uint8_t *xrates)
  667 {
  668         static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
  669         int i;
  670 
  671         /* NB: the 11b clients we care about will not have xrates */
  672         if (xrates != NULL || rates == NULL)
  673                 return 0;
  674         for (i = 0; i < rates[1]; i++) {
  675                 int r = rates[2+i] & IEEE80211_RATE_VAL;
  676                 if (r > 2*11 || ((1<<r) & brates) == 0)
  677                         return 0;
  678         }
  679         return 1;
  680 }
  681 
  682 static void
  683 adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
  684         int subtype, int rssi, int nf)
  685 {
  686         struct ieee80211vap *vap = ni->ni_vap;
  687         struct ieee80211com *ic = ni->ni_ic;
  688         struct ieee80211_frame *wh;
  689         uint8_t *frm, *efrm, *sfrm;
  690         uint8_t *ssid, *rates, *xrates;
  691 #if 0
  692         int ht_state_change = 0;
  693 #endif
  694 
  695         wh = mtod(m0, struct ieee80211_frame *);
  696         frm = (uint8_t *)&wh[1];
  697         efrm = mtod(m0, uint8_t *) + m0->m_len;
  698         switch (subtype) {
  699         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  700         case IEEE80211_FC0_SUBTYPE_BEACON: {
  701                 struct ieee80211_scanparams scan;
  702                 /*
  703                  * We process beacon/probe response
  704                  * frames to discover neighbors.
  705                  */ 
  706                 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
  707                         return;
  708                 /*
  709                  * Count frame now that we know it's to be processed.
  710                  */
  711                 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
  712                         vap->iv_stats.is_rx_beacon++;           /* XXX remove */
  713                         IEEE80211_NODE_STAT(ni, rx_beacons);
  714                 } else
  715                         IEEE80211_NODE_STAT(ni, rx_proberesp);
  716                 /*
  717                  * If scanning, just pass information to the scan module.
  718                  */
  719                 if (ic->ic_flags & IEEE80211_F_SCAN) {
  720                         if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
  721                                 /*
  722                                  * Actively scanning a channel marked passive;
  723                                  * send a probe request now that we know there
  724                                  * is 802.11 traffic present.
  725                                  *
  726                                  * XXX check if the beacon we recv'd gives
  727                                  * us what we need and suppress the probe req
  728                                  */
  729                                 ieee80211_probe_curchan(vap, 1);
  730                                 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
  731                         }
  732                         ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf);
  733                         return;
  734                 }
  735                 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
  736                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
  737                                 /*
  738                                  * Create a new entry in the neighbor table.
  739                                  */
  740                                 ni = ieee80211_add_neighbor(vap, wh, &scan);
  741                         } else if (ni->ni_capinfo == 0) {
  742                                 /*
  743                                  * Update faked node created on transmit.
  744                                  * Note this also updates the tsf.
  745                                  */
  746                                 ieee80211_init_neighbor(ni, wh, &scan);
  747                         } else {
  748                                 /*
  749                                  * Record tsf for potential resync.
  750                                  */
  751                                 memcpy(ni->ni_tstamp.data, scan.tstamp,
  752                                         sizeof(ni->ni_tstamp));
  753                         }
  754                         /*
  755                          * This isn't enabled yet - otherwise it would
  756                          * update the HT parameters and channel width
  757                          * from any node, which could lead to lots of
  758                          * strange behaviour if the 11n nodes aren't
  759                          * exactly configured to match.
  760                          */
  761 #if 0
  762                         if (scan.htcap != NULL && scan.htinfo != NULL &&
  763                             (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
  764                                 if (ieee80211_ht_updateparams(ni,
  765                                     scan.htcap, scan.htinfo))
  766                                         ht_state_change = 1;
  767                         }
  768 #endif
  769                         if (ni != NULL) {
  770                                 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  771                                 ni->ni_noise = nf;
  772                         }
  773                         /*
  774                          * Same here - the channel width change should
  775                          * be applied to the specific peer node, not
  776                          * to the ic.  Ie, the interface configuration
  777                          * should stay in its current channel width;
  778                          * but it should change the rate control and
  779                          * any queued frames for the given node only.
  780                          *
  781                          * Since there's no (current) way to inform
  782                          * the driver that a channel width change has
  783                          * occured for a single node, just stub this
  784                          * out.
  785                          */
  786 #if 0
  787                         if (ht_state_change)
  788                                 ieee80211_update_chw(ic);
  789 #endif
  790                 }
  791                 break;
  792         }
  793 
  794         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  795                 if (vap->iv_state != IEEE80211_S_RUN) {
  796                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  797                             wh, NULL, "wrong state %s",
  798                             ieee80211_state_name[vap->iv_state]);
  799                         vap->iv_stats.is_rx_mgtdiscard++;
  800                         return;
  801                 }
  802                 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
  803                         /* frame must be directed */
  804                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  805                             wh, NULL, "%s", "not unicast");
  806                         vap->iv_stats.is_rx_mgtdiscard++;       /* XXX stat */
  807                         return;
  808                 }
  809 
  810                 /*
  811                  * prreq frame format
  812                  *      [tlv] ssid
  813                  *      [tlv] supported rates
  814                  *      [tlv] extended supported rates
  815                  */
  816                 ssid = rates = xrates = NULL;
  817                 sfrm = frm;
  818                 while (efrm - frm > 1) {
  819                         IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
  820                         switch (*frm) {
  821                         case IEEE80211_ELEMID_SSID:
  822                                 ssid = frm;
  823                                 break;
  824                         case IEEE80211_ELEMID_RATES:
  825                                 rates = frm;
  826                                 break;
  827                         case IEEE80211_ELEMID_XRATES:
  828                                 xrates = frm;
  829                                 break;
  830                         }
  831                         frm += frm[1] + 2;
  832                 }
  833                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
  834                 if (xrates != NULL)
  835                         IEEE80211_VERIFY_ELEMENT(xrates,
  836                                 IEEE80211_RATE_MAXSIZE - rates[1], return);
  837                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
  838                 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
  839                 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
  840                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  841                             wh, NULL,
  842                             "%s", "no ssid with ssid suppression enabled");
  843                         vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
  844                         return;
  845                 }
  846 
  847                 /* XXX find a better class or define it's own */
  848                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
  849                     "%s", "recv probe req");
  850                 /*
  851                  * Some legacy 11b clients cannot hack a complete
  852                  * probe response frame.  When the request includes
  853                  * only a bare-bones rate set, communicate this to
  854                  * the transmit side.
  855                  */
  856                 ieee80211_send_proberesp(vap, wh->i_addr2,
  857                     is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
  858                 break;
  859 
  860         case IEEE80211_FC0_SUBTYPE_ACTION:
  861         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
  862                 if (ni == vap->iv_bss) {
  863                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  864                             wh, NULL, "%s", "unknown node");
  865                         vap->iv_stats.is_rx_mgtdiscard++;
  866                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
  867                     !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  868                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  869                             wh, NULL, "%s", "not for us");
  870                         vap->iv_stats.is_rx_mgtdiscard++;
  871                 } else if (vap->iv_state != IEEE80211_S_RUN) {
  872                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  873                             wh, NULL, "wrong state %s",
  874                             ieee80211_state_name[vap->iv_state]);
  875                         vap->iv_stats.is_rx_mgtdiscard++;
  876                 } else {
  877                         if (ieee80211_parse_action(ni, m0) == 0)
  878                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
  879                 }
  880                 break;
  881 
  882         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
  883         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
  884         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
  885         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
  886         case IEEE80211_FC0_SUBTYPE_ATIM:
  887         case IEEE80211_FC0_SUBTYPE_DISASSOC:
  888         case IEEE80211_FC0_SUBTYPE_AUTH:
  889         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  890                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  891                     wh, NULL, "%s", "not handled");
  892                 vap->iv_stats.is_rx_mgtdiscard++;
  893                 break;
  894 
  895         default:
  896                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  897                     wh, "mgt", "subtype 0x%x not handled", subtype);
  898                 vap->iv_stats.is_rx_badsubtype++;
  899                 break;
  900         }
  901 }
  902 #undef IEEE80211_VERIFY_LENGTH
  903 #undef IEEE80211_VERIFY_ELEMENT
  904 
  905 static void
  906 ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
  907         int subtype, int rssi, int nf)
  908 {
  909         struct ieee80211vap *vap = ni->ni_vap;
  910         struct ieee80211com *ic = ni->ni_ic;
  911         struct ieee80211_frame *wh;
  912 
  913         /*
  914          * Process management frames when scanning; useful for doing
  915          * a site-survey.
  916          */
  917         if (ic->ic_flags & IEEE80211_F_SCAN)
  918                 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
  919         else {
  920                 wh = mtod(m0, struct ieee80211_frame *);
  921                 switch (subtype) {
  922                 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
  923                 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
  924                 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
  925                 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
  926                 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  927                 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  928                 case IEEE80211_FC0_SUBTYPE_BEACON:
  929                 case IEEE80211_FC0_SUBTYPE_ATIM:
  930                 case IEEE80211_FC0_SUBTYPE_DISASSOC:
  931                 case IEEE80211_FC0_SUBTYPE_AUTH:
  932                 case IEEE80211_FC0_SUBTYPE_DEAUTH:
  933                 case IEEE80211_FC0_SUBTYPE_ACTION:
  934                 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
  935                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  936                              wh, NULL, "%s", "not handled");
  937                         vap->iv_stats.is_rx_mgtdiscard++;
  938                         break;
  939                 default:
  940                         IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  941                              wh, "mgt", "subtype 0x%x not handled", subtype);
  942                         vap->iv_stats.is_rx_badsubtype++;
  943                         break;
  944                 }
  945         }
  946 }
  947 
  948 static void
  949 adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
  950 {
  951 
  952         switch (subtype) {
  953         case IEEE80211_FC0_SUBTYPE_BAR:
  954                 ieee80211_recv_bar(ni, m);
  955                 break;
  956         }
  957 }

Cache object: 83ab9aee0b95fa7b250f1df1ac1f8c4b


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