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_wds.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/11.0/sys/net80211/ieee80211_wds.c 299575 2016-05-12 22:17:00Z avos $");
   29 #endif
   30 
   31 /*
   32  * IEEE 802.11 WDS mode support.
   33  */
   34 #include "opt_inet.h"
   35 #include "opt_wlan.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h> 
   39 #include <sys/mbuf.h>   
   40 #include <sys/malloc.h>
   41 #include <sys/kernel.h>
   42 
   43 #include <sys/socket.h>
   44 #include <sys/sockio.h>
   45 #include <sys/endian.h>
   46 #include <sys/errno.h>
   47 #include <sys/proc.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_var.h>
   52 #include <net/if_media.h>
   53 #include <net/if_llc.h>
   54 #include <net/ethernet.h>
   55 
   56 #include <net/bpf.h>
   57 
   58 #include <net80211/ieee80211_var.h>
   59 #include <net80211/ieee80211_wds.h>
   60 #include <net80211/ieee80211_input.h>
   61 #ifdef IEEE80211_SUPPORT_SUPERG
   62 #include <net80211/ieee80211_superg.h>
   63 #endif
   64 
   65 static void wds_vattach(struct ieee80211vap *);
   66 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   67 static  int wds_input(struct ieee80211_node *ni, struct mbuf *m,
   68             const struct ieee80211_rx_stats *rxs, int, int);
   69 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
   70         const struct ieee80211_rx_stats *, int, int);
   71 
   72 void
   73 ieee80211_wds_attach(struct ieee80211com *ic)
   74 {
   75         ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
   76 }
   77 
   78 void
   79 ieee80211_wds_detach(struct ieee80211com *ic)
   80 {
   81 }
   82 
   83 static void
   84 wds_vdetach(struct ieee80211vap *vap)
   85 {
   86         if (vap->iv_bss != NULL) {
   87                 /* XXX locking? */
   88                 if (vap->iv_bss->ni_wdsvap == vap)
   89                         vap->iv_bss->ni_wdsvap = NULL;
   90         }
   91 }
   92 
   93 static void
   94 wds_vattach(struct ieee80211vap *vap)
   95 {
   96         vap->iv_newstate = wds_newstate;
   97         vap->iv_input = wds_input;
   98         vap->iv_recv_mgmt = wds_recv_mgmt;
   99         vap->iv_opdetach = wds_vdetach;
  100 }
  101 
  102 static void
  103 wds_flush(struct ieee80211_node *ni)
  104 {
  105         struct ieee80211com *ic = ni->ni_ic;
  106         struct mbuf *m, *next;
  107         int8_t rssi, nf;
  108 
  109         m = ieee80211_ageq_remove(&ic->ic_stageq,
  110             (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
  111         if (m == NULL)
  112                 return;
  113 
  114         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
  115             "%s", "flush wds queue");
  116         ic->ic_node_getsignal(ni, &rssi, &nf);
  117         for (; m != NULL; m = next) {
  118                 next = m->m_nextpkt;
  119                 m->m_nextpkt = NULL;
  120                 ieee80211_input(ni, m, rssi, nf);
  121         }
  122 }
  123 
  124 static int
  125 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
  126 {
  127         struct ieee80211com *ic = vap->iv_ic;
  128         struct ieee80211_node_table *nt = &ic->ic_sta;
  129         struct ieee80211_node *ni, *obss;
  130 
  131         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  132              "%s: creating link to %s on channel %u\n", __func__,
  133              ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
  134 
  135         /* NB: vap create must specify the bssid for the link */
  136         KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
  137         /* NB: we should only be called on RUN transition */
  138         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
  139 
  140         if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
  141                 /*
  142                  * Dynamic/non-legacy WDS.  Reference the associated
  143                  * station specified by the desired bssid setup at vap
  144                  * create.  Point ni_wdsvap at the WDS vap so 4-address
  145                  * frames received through the associated AP vap will
  146                  * be dispatched upward (e.g. to a bridge) as though
  147                  * they arrived on the WDS vap.
  148                  */
  149                 IEEE80211_NODE_LOCK(nt);
  150                 obss = NULL;
  151                 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
  152                 if (ni == NULL) {
  153                         /*
  154                          * Node went away before we could hookup.  This
  155                          * should be ok; no traffic will flow and a leave
  156                          * event will be dispatched that should cause
  157                          * the vap to be destroyed.
  158                          */
  159                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  160                             "%s: station %s went away\n",
  161                             __func__, ether_sprintf(vap->iv_des_bssid));
  162                         /* XXX stat? */
  163                 } else if (ni->ni_wdsvap != NULL) {
  164                         /*
  165                          * Node already setup with a WDS vap; we cannot
  166                          * allow multiple references so disallow.  If
  167                          * ni_wdsvap points at us that's ok; we should
  168                          * do nothing anyway.
  169                          */
  170                         /* XXX printf instead? */
  171                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  172                             "%s: station %s in use with %s\n",
  173                             __func__, ether_sprintf(vap->iv_des_bssid),
  174                             ni->ni_wdsvap->iv_ifp->if_xname);
  175                         /* XXX stat? */
  176                 } else {
  177                         /*
  178                          * Committed to new node, setup state.
  179                          */
  180                         obss = vap->iv_bss;
  181                         vap->iv_bss = ni;
  182                         ni->ni_wdsvap = vap;
  183                 }
  184                 IEEE80211_NODE_UNLOCK(nt);
  185                 if (obss != NULL) {
  186                         /* NB: deferred to avoid recursive lock */
  187                         ieee80211_free_node(obss);
  188                 }
  189         } else {
  190                 /*
  191                  * Legacy WDS vap setup.
  192                  */
  193                 /*
  194                  * The far end does not associate so we just create
  195                  * create a new node and install it as the vap's
  196                  * bss node.  We must simulate an association and
  197                  * authorize the port for traffic to flow.
  198                  * XXX check if node already in sta table?
  199                  */
  200                 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
  201                 if (ni != NULL) {
  202                         obss = vap->iv_bss;
  203                         vap->iv_bss = ieee80211_ref_node(ni);
  204                         ni->ni_flags |= IEEE80211_NODE_AREF;
  205                         if (obss != NULL)
  206                                 ieee80211_free_node(obss);
  207                         /* give driver a chance to setup state like ni_txrate */
  208                         if (ic->ic_newassoc != NULL)
  209                                 ic->ic_newassoc(ni, 1);
  210                         /* tell the authenticator about new station */
  211                         if (vap->iv_auth->ia_node_join != NULL)
  212                                 vap->iv_auth->ia_node_join(ni);
  213                         if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  214                                 ieee80211_node_authorize(ni);
  215 
  216                         ieee80211_notify_node_join(ni, 1 /*newassoc*/);
  217                         /* XXX inject l2uf frame */
  218                 }
  219         }
  220 
  221         /*
  222          * Flush any pending frames now that were setup.
  223          */
  224         if (ni != NULL)
  225                 wds_flush(ni);
  226         return (ni == NULL ? ENOENT : 0);
  227 }
  228 
  229 /*
  230  * Propagate multicast frames of an ap vap to all DWDS links.
  231  * The caller is assumed to have verified this frame is multicast.
  232  */
  233 void
  234 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
  235 {
  236         struct ieee80211com *ic = vap0->iv_ic;
  237         const struct ether_header *eh = mtod(m, const struct ether_header *);
  238         struct ieee80211_node *ni;
  239         struct ieee80211vap *vap;
  240         struct ifnet *ifp;
  241         struct mbuf *mcopy;
  242         int err;
  243 
  244         KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
  245             ("%s not mcast", ether_sprintf(eh->ether_dhost)));
  246 
  247         /* XXX locking */
  248         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  249                 /* only DWDS vaps are interesting */
  250                 if (vap->iv_opmode != IEEE80211_M_WDS ||
  251                     (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
  252                         continue;
  253                 /* if it came in this interface, don't send it back out */
  254                 ifp = vap->iv_ifp;
  255                 if (ifp == m->m_pkthdr.rcvif)
  256                         continue;
  257                 /*
  258                  * Duplicate the frame and send it.
  259                  */
  260                 mcopy = m_copypacket(m, M_NOWAIT);
  261                 if (mcopy == NULL) {
  262                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  263                         /* XXX stat + msg */
  264                         continue;
  265                 }
  266                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
  267                 if (ni == NULL) {
  268                         /* NB: ieee80211_find_txnode does stat+msg */
  269                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  270                         m_freem(mcopy);
  271                         continue;
  272                 }
  273                 /* calculate priority so drivers can find the tx queue */
  274                 if (ieee80211_classify(ni, mcopy)) {
  275                         IEEE80211_DISCARD_MAC(vap,
  276                             IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
  277                             eh->ether_dhost, NULL,
  278                             "%s", "classification failure");
  279                         vap->iv_stats.is_tx_classify++;
  280                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  281                         m_freem(mcopy);
  282                         ieee80211_free_node(ni);
  283                         continue;
  284                 }
  285 
  286                 BPF_MTAP(ifp, m);               /* 802.3 tx */
  287 
  288                 /*
  289                  * Encapsulate the packet in prep for transmission.
  290                  */
  291                 IEEE80211_TX_LOCK(ic);
  292                 mcopy = ieee80211_encap(vap, ni, mcopy);
  293                 if (mcopy == NULL) {
  294                         /* NB: stat+msg handled in ieee80211_encap */
  295                         IEEE80211_TX_UNLOCK(ic);
  296                         ieee80211_free_node(ni);
  297                         continue;
  298                 }
  299                 mcopy->m_flags |= M_MCAST;
  300                 mcopy->m_pkthdr.rcvif = (void *) ni;
  301 
  302                 err = ieee80211_parent_xmitpkt(ic, mcopy);
  303                 IEEE80211_TX_UNLOCK(ic);
  304                 if (!err) {
  305                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
  306                         if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
  307                         if_inc_counter(ifp, IFCOUNTER_OBYTES,
  308                             m->m_pkthdr.len);
  309                 }
  310         }
  311 }
  312 
  313 /*
  314  * Handle DWDS discovery on receipt of a 4-address frame in
  315  * ap mode.  Queue the frame and post an event for someone
  316  * to plumb the necessary WDS vap for this station.  Frames
  317  * received prior to the vap set running will then be reprocessed
  318  * as if they were just received.
  319  */
  320 void
  321 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
  322 {
  323         struct ieee80211com *ic = ni->ni_ic;
  324 
  325         /*
  326          * Save the frame with an aging interval 4 times
  327          * the listen interval specified by the station. 
  328          * Frames that sit around too long are reclaimed
  329          * using this information.
  330          * XXX handle overflow?
  331          * XXX per/vap beacon interval?
  332          */
  333         m->m_pkthdr.rcvif = (void *)(uintptr_t)
  334             ieee80211_mac_hash(ic, ni->ni_macaddr);
  335         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
  336             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
  337         ieee80211_notify_wds_discover(ni);
  338 }
  339 
  340 /*
  341  * IEEE80211_M_WDS vap state machine handler.
  342  */
  343 static int
  344 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  345 {
  346         struct ieee80211com *ic = vap->iv_ic;
  347         enum ieee80211_state ostate;
  348         int error;
  349 
  350         IEEE80211_LOCK_ASSERT(ic);
  351 
  352         ostate = vap->iv_state;
  353         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
  354                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
  355         vap->iv_state = nstate;                 /* state transition */
  356         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
  357         if (ostate != IEEE80211_S_SCAN)
  358                 ieee80211_cancel_scan(vap);     /* background scan */
  359         error = 0;
  360         switch (nstate) {
  361         case IEEE80211_S_INIT:
  362                 switch (ostate) {
  363                 case IEEE80211_S_SCAN:
  364                         ieee80211_cancel_scan(vap);
  365                         break;
  366                 default:
  367                         break;
  368                 }
  369                 if (ostate != IEEE80211_S_INIT) {
  370                         /* NB: optimize INIT -> INIT case */
  371                         ieee80211_reset_bss(vap);
  372                 }
  373                 break;
  374         case IEEE80211_S_SCAN:
  375                 switch (ostate) {
  376                 case IEEE80211_S_INIT:
  377                         ieee80211_check_scan_current(vap);
  378                         break;
  379                 default:
  380                         break;
  381                 }
  382                 break;
  383         case IEEE80211_S_RUN:
  384                 if (ostate == IEEE80211_S_INIT) {
  385                         /*
  386                          * Already have a channel; bypass the scan
  387                          * and startup immediately.
  388                          */
  389                         error = ieee80211_create_wds(vap, ic->ic_curchan);
  390                 }
  391                 break;
  392         default:
  393                 break;
  394         }
  395         return error;
  396 }
  397 
  398 /*
  399  * Process a received frame.  The node associated with the sender
  400  * should be supplied.  If nothing was found in the node table then
  401  * the caller is assumed to supply a reference to iv_bss instead.
  402  * The RSSI and a timestamp are also supplied.  The RSSI data is used
  403  * during AP scanning to select a AP to associate with; it can have
  404  * any units so long as values have consistent units and higher values
  405  * mean ``better signal''.  The receive timestamp is currently not used
  406  * by the 802.11 layer.
  407  */
  408 static int
  409 wds_input(struct ieee80211_node *ni, struct mbuf *m,
  410     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
  411 {
  412         struct ieee80211vap *vap = ni->ni_vap;
  413         struct ieee80211com *ic = ni->ni_ic;
  414         struct ifnet *ifp = vap->iv_ifp;
  415         struct ieee80211_frame *wh;
  416         struct ieee80211_key *key;
  417         struct ether_header *eh;
  418         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
  419         uint8_t dir, type, subtype, qos;
  420 
  421         if (m->m_flags & M_AMPDU_MPDU) {
  422                 /*
  423                  * Fastpath for A-MPDU reorder q resubmission.  Frames
  424                  * w/ M_AMPDU_MPDU marked have already passed through
  425                  * here but were received out of order and been held on
  426                  * the reorder queue.  When resubmitted they are marked
  427                  * with the M_AMPDU_MPDU flag and we can bypass most of
  428                  * the normal processing.
  429                  */
  430                 wh = mtod(m, struct ieee80211_frame *);
  431                 type = IEEE80211_FC0_TYPE_DATA;
  432                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  433                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
  434                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
  435                 goto resubmit_ampdu;
  436         }
  437 
  438         KASSERT(ni != NULL, ("null node"));
  439 
  440         type = -1;                      /* undefined */
  441 
  442         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  443                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  444                     ni->ni_macaddr, NULL,
  445                     "too short (1): len %u", m->m_pkthdr.len);
  446                 vap->iv_stats.is_rx_tooshort++;
  447                 goto out;
  448         }
  449         /*
  450          * Bit of a cheat here, we use a pointer for a 3-address
  451          * frame format but don't reference fields past outside
  452          * ieee80211_frame_min w/o first validating the data is
  453          * present.
  454          */
  455         wh = mtod(m, struct ieee80211_frame *);
  456 
  457         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
  458                 ni->ni_inact = ni->ni_inact_reload;
  459 
  460         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  461             IEEE80211_FC0_VERSION_0) {
  462                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  463                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  464                     wh->i_fc[0], wh->i_fc[1]);
  465                 vap->iv_stats.is_rx_badversion++;
  466                 goto err;
  467         }
  468 
  469         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  470         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  471         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  472 
  473         /* NB: WDS vap's do not scan */
  474         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
  475                 IEEE80211_DISCARD_MAC(vap,
  476                     IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
  477                     "too short (3): len %u", m->m_pkthdr.len);
  478                 vap->iv_stats.is_rx_tooshort++;
  479                 goto out;
  480         }
  481         /* NB: the TA is implicitly verified by finding the wds peer node */
  482         if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
  483             !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
  484                 /* not interested in */
  485                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  486                     wh->i_addr1, NULL, "%s", "not to bss");
  487                 vap->iv_stats.is_rx_wrongbss++;
  488                 goto out;
  489         }
  490         IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  491         ni->ni_noise = nf;
  492         if (IEEE80211_HAS_SEQ(type, subtype)) {
  493                 uint8_t tid = ieee80211_gettid(wh);
  494                 if (IEEE80211_QOS_HAS_SEQ(wh) &&
  495                     TID_TO_WME_AC(tid) >= WME_AC_VI)
  496                         ic->ic_wme.wme_hipri_traffic++;
  497                 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1))
  498                         goto out;
  499         }
  500         switch (type) {
  501         case IEEE80211_FC0_TYPE_DATA:
  502                 hdrspace = ieee80211_hdrspace(ic, wh);
  503                 if (m->m_len < hdrspace &&
  504                     (m = m_pullup(m, hdrspace)) == NULL) {
  505                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  506                             ni->ni_macaddr, NULL,
  507                             "data too short: expecting %u", hdrspace);
  508                         vap->iv_stats.is_rx_tooshort++;
  509                         goto out;               /* XXX */
  510                 }
  511                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
  512                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  513                             wh, "data", "incorrect dir 0x%x", dir);
  514                         vap->iv_stats.is_rx_wrongdir++;
  515                         goto out;
  516                 }
  517                 /*
  518                  * Only legacy WDS traffic should take this path.
  519                  */
  520                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
  521                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  522                             wh, "data", "%s", "not legacy wds");
  523                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
  524                         goto out;
  525                 }
  526                 /*
  527                  * Handle A-MPDU re-ordering.  If the frame is to be
  528                  * processed directly then ieee80211_ampdu_reorder
  529                  * will return 0; otherwise it has consumed the mbuf
  530                  * and we should do nothing more with it.
  531                  */
  532                 if ((m->m_flags & M_AMPDU) &&
  533                     ieee80211_ampdu_reorder(ni, m) != 0) {
  534                         m = NULL;
  535                         goto out;
  536                 }
  537         resubmit_ampdu:
  538 
  539                 /*
  540                  * Handle privacy requirements.  Note that we
  541                  * must not be preempted from here until after
  542                  * we (potentially) call ieee80211_crypto_demic;
  543                  * otherwise we may violate assumptions in the
  544                  * crypto cipher modules used to do delayed update
  545                  * of replay sequence numbers.
  546                  */
  547                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
  548                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  549                                 /*
  550                                  * Discard encrypted frames when privacy is off.
  551                                  */
  552                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  553                                     wh, "WEP", "%s", "PRIVACY off");
  554                                 vap->iv_stats.is_rx_noprivacy++;
  555                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
  556                                 goto out;
  557                         }
  558                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  559                         if (key == NULL) {
  560                                 /* NB: stats+msgs handled in crypto_decap */
  561                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
  562                                 goto out;
  563                         }
  564                         wh = mtod(m, struct ieee80211_frame *);
  565                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
  566                 } else {
  567                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
  568                         key = NULL;
  569                 }
  570 
  571                 /*
  572                  * Save QoS bits for use below--before we strip the header.
  573                  */
  574                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  575                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  576                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  577                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
  578                 } else
  579                         qos = 0;
  580 
  581                 /*
  582                  * Next up, any fragmentation.
  583                  */
  584                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  585                         m = ieee80211_defrag(ni, m, hdrspace);
  586                         if (m == NULL) {
  587                                 /* Fragment dropped or frame not complete yet */
  588                                 goto out;
  589                         }
  590                 }
  591                 wh = NULL;              /* no longer valid, catch any uses */
  592 
  593                 /*
  594                  * Next strip any MSDU crypto bits.
  595                  */
  596                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  597                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  598                             ni->ni_macaddr, "data", "%s", "demic error");
  599                         vap->iv_stats.is_rx_demicfail++;
  600                         IEEE80211_NODE_STAT(ni, rx_demicfail);
  601                         goto out;
  602                 }
  603 
  604                 /* copy to listener after decrypt */
  605                 if (ieee80211_radiotap_active_vap(vap))
  606                         ieee80211_radiotap_rx(vap, m);
  607                 need_tap = 0;
  608 
  609                 /*
  610                  * Finally, strip the 802.11 header.
  611                  */
  612                 m = ieee80211_decap(vap, m, hdrspace);
  613                 if (m == NULL) {
  614                         /* XXX mask bit to check for both */
  615                         /* don't count Null data frames as errors */
  616                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  617                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  618                                 goto out;
  619                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  620                             ni->ni_macaddr, "data", "%s", "decap error");
  621                         vap->iv_stats.is_rx_decap++;
  622                         IEEE80211_NODE_STAT(ni, rx_decap);
  623                         goto err;
  624                 }
  625                 eh = mtod(m, struct ether_header *);
  626                 if (!ieee80211_node_is_authorized(ni)) {
  627                         /*
  628                          * Deny any non-PAE frames received prior to
  629                          * authorization.  For open/shared-key
  630                          * authentication the port is mark authorized
  631                          * after authentication completes.  For 802.1x
  632                          * the port is not marked authorized by the
  633                          * authenticator until the handshake has completed.
  634                          */
  635                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  636                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  637                                     eh->ether_shost, "data",
  638                                     "unauthorized port: ether type 0x%x len %u",
  639                                     eh->ether_type, m->m_pkthdr.len);
  640                                 vap->iv_stats.is_rx_unauth++;
  641                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  642                                 goto err;
  643                         }
  644                 } else {
  645                         /*
  646                          * When denying unencrypted frames, discard
  647                          * any non-PAE frames received without encryption.
  648                          */
  649                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  650                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
  651                             eh->ether_type != htons(ETHERTYPE_PAE)) {
  652                                 /*
  653                                  * Drop unencrypted frames.
  654                                  */
  655                                 vap->iv_stats.is_rx_unencrypted++;
  656                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
  657                                 goto out;
  658                         }
  659                 }
  660                 /* XXX require HT? */
  661                 if (qos & IEEE80211_QOS_AMSDU) {
  662                         m = ieee80211_decap_amsdu(ni, m);
  663                         if (m == NULL)
  664                                 return IEEE80211_FC0_TYPE_DATA;
  665                 } else {
  666 #ifdef IEEE80211_SUPPORT_SUPERG
  667                         m = ieee80211_decap_fastframe(vap, ni, m);
  668                         if (m == NULL)
  669                                 return IEEE80211_FC0_TYPE_DATA;
  670 #endif
  671                 }
  672                 ieee80211_deliver_data(vap, ni, m);
  673                 return IEEE80211_FC0_TYPE_DATA;
  674 
  675         case IEEE80211_FC0_TYPE_MGT:
  676                 vap->iv_stats.is_rx_mgmt++;
  677                 IEEE80211_NODE_STAT(ni, rx_mgmt);
  678                 if (dir != IEEE80211_FC1_DIR_NODS) {
  679                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  680                             wh, "data", "incorrect dir 0x%x", dir);
  681                         vap->iv_stats.is_rx_wrongdir++;
  682                         goto err;
  683                 }
  684                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  685                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  686                             ni->ni_macaddr, "mgt", "too short: len %u",
  687                             m->m_pkthdr.len);
  688                         vap->iv_stats.is_rx_tooshort++;
  689                         goto out;
  690                 }
  691 #ifdef IEEE80211_DEBUG
  692                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
  693                         if_printf(ifp, "received %s from %s rssi %d\n",
  694                             ieee80211_mgt_subtype_name(subtype),
  695                             ether_sprintf(wh->i_addr2), rssi);
  696                 }
  697 #endif
  698                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
  699                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  700                             wh, NULL, "%s", "WEP set but not permitted");
  701                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  702                         goto out;
  703                 }
  704                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
  705                 goto out;
  706 
  707         case IEEE80211_FC0_TYPE_CTL:
  708                 vap->iv_stats.is_rx_ctl++;
  709                 IEEE80211_NODE_STAT(ni, rx_ctrl);
  710                 goto out;
  711 
  712         default:
  713                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  714                     wh, "bad", "frame type 0x%x", type);
  715                 /* should not come here */
  716                 break;
  717         }
  718 err:
  719         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
  720 out:
  721         if (m != NULL) {
  722                 if (need_tap && ieee80211_radiotap_active_vap(vap))
  723                         ieee80211_radiotap_rx(vap, m);
  724                 m_freem(m);
  725         }
  726         return type;
  727 }
  728 
  729 static void
  730 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
  731     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
  732 {
  733         struct ieee80211vap *vap = ni->ni_vap;
  734         struct ieee80211com *ic = ni->ni_ic;
  735         struct ieee80211_frame *wh;
  736         u_int8_t *frm, *efrm;
  737 
  738         wh = mtod(m0, struct ieee80211_frame *);
  739         frm = (u_int8_t *)&wh[1];
  740         efrm = mtod(m0, u_int8_t *) + m0->m_len;
  741         switch (subtype) {
  742         case IEEE80211_FC0_SUBTYPE_ACTION:
  743         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
  744                 if (ni == vap->iv_bss) {
  745                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  746                             wh, NULL, "%s", "unknown node");
  747                         vap->iv_stats.is_rx_mgtdiscard++;
  748                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
  749                         /* NB: not interested in multicast frames. */
  750                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  751                             wh, NULL, "%s", "not for us");
  752                         vap->iv_stats.is_rx_mgtdiscard++;
  753                 } else if (vap->iv_state != IEEE80211_S_RUN) {
  754                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  755                             wh, NULL, "wrong state %s",
  756                             ieee80211_state_name[vap->iv_state]);
  757                         vap->iv_stats.is_rx_mgtdiscard++;
  758                 } else {
  759                         if (ieee80211_parse_action(ni, m0) == 0)
  760                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
  761                 }
  762                 break;
  763 
  764         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
  765         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
  766         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
  767         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
  768         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  769         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  770         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
  771         case IEEE80211_FC0_SUBTYPE_BEACON:
  772         case IEEE80211_FC0_SUBTYPE_ATIM:
  773         case IEEE80211_FC0_SUBTYPE_DISASSOC:
  774         case IEEE80211_FC0_SUBTYPE_AUTH:
  775         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  776                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  777                     wh, NULL, "%s", "not handled");
  778                 vap->iv_stats.is_rx_mgtdiscard++;
  779                 break;
  780 
  781         default:
  782                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  783                     wh, "mgt", "subtype 0x%x not handled", subtype);
  784                 vap->iv_stats.is_rx_badsubtype++;
  785                 break;
  786         }
  787 }

Cache object: f59030007f7d85844223fab9f97faf18


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