The Design and Implementation of the FreeBSD Operating System, Second Edition
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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: stable/9/sys/net80211/ieee80211_wds.c 221418 2011-05-04 02:23:59Z adrian $");
   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_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_wds.h>
   59 #include <net80211/ieee80211_input.h>
   60 #ifdef IEEE80211_SUPPORT_SUPERG
   61 #include <net80211/ieee80211_superg.h>
   62 #endif
   63 
   64 static void wds_vattach(struct ieee80211vap *);
   65 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   66 static  int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int);
   67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
   68             int subtype, int, int);
   69 
   70 void
   71 ieee80211_wds_attach(struct ieee80211com *ic)
   72 {
   73         ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
   74 }
   75 
   76 void
   77 ieee80211_wds_detach(struct ieee80211com *ic)
   78 {
   79 }
   80 
   81 static void
   82 wds_vdetach(struct ieee80211vap *vap)
   83 {
   84         if (vap->iv_bss != NULL) {
   85                 /* XXX locking? */
   86                 if (vap->iv_bss->ni_wdsvap == vap)
   87                         vap->iv_bss->ni_wdsvap = NULL;
   88         }
   89 }
   90 
   91 static void
   92 wds_vattach(struct ieee80211vap *vap)
   93 {
   94         vap->iv_newstate = wds_newstate;
   95         vap->iv_input = wds_input;
   96         vap->iv_recv_mgmt = wds_recv_mgmt;
   97         vap->iv_opdetach = wds_vdetach;
   98 }
   99 
  100 static void
  101 wds_flush(struct ieee80211_node *ni)
  102 {
  103         struct ieee80211com *ic = ni->ni_ic;
  104         struct mbuf *m, *next;
  105         int8_t rssi, nf;
  106 
  107         m = ieee80211_ageq_remove(&ic->ic_stageq,
  108             (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
  109         if (m == NULL)
  110                 return;
  111 
  112         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
  113             "%s", "flush wds queue");
  114         ic->ic_node_getsignal(ni, &rssi, &nf);
  115         for (; m != NULL; m = next) {
  116                 next = m->m_nextpkt;
  117                 m->m_nextpkt = NULL;
  118                 ieee80211_input(ni, m, rssi, nf);
  119         }
  120 }
  121 
  122 static int
  123 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
  124 {
  125         struct ieee80211com *ic = vap->iv_ic;
  126         struct ieee80211_node_table *nt = &ic->ic_sta;
  127         struct ieee80211_node *ni, *obss;
  128 
  129         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  130              "%s: creating link to %s on channel %u\n", __func__,
  131              ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
  132 
  133         /* NB: vap create must specify the bssid for the link */
  134         KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
  135         /* NB: we should only be called on RUN transition */
  136         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
  137 
  138         if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
  139                 /*
  140                  * Dynamic/non-legacy WDS.  Reference the associated
  141                  * station specified by the desired bssid setup at vap
  142                  * create.  Point ni_wdsvap at the WDS vap so 4-address
  143                  * frames received through the associated AP vap will
  144                  * be dispatched upward (e.g. to a bridge) as though
  145                  * they arrived on the WDS vap.
  146                  */
  147                 IEEE80211_NODE_LOCK(nt);
  148                 obss = NULL;
  149                 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
  150                 if (ni == NULL) {
  151                         /*
  152                          * Node went away before we could hookup.  This
  153                          * should be ok; no traffic will flow and a leave
  154                          * event will be dispatched that should cause
  155                          * the vap to be destroyed.
  156                          */
  157                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  158                             "%s: station %s went away\n",
  159                             __func__, ether_sprintf(vap->iv_des_bssid));
  160                         /* XXX stat? */
  161                 } else if (ni->ni_wdsvap != NULL) {
  162                         /*
  163                          * Node already setup with a WDS vap; we cannot
  164                          * allow multiple references so disallow.  If
  165                          * ni_wdsvap points at us that's ok; we should
  166                          * do nothing anyway.
  167                          */
  168                         /* XXX printf instead? */
  169                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
  170                             "%s: station %s in use with %s\n",
  171                             __func__, ether_sprintf(vap->iv_des_bssid),
  172                             ni->ni_wdsvap->iv_ifp->if_xname);
  173                         /* XXX stat? */
  174                 } else {
  175                         /*
  176                          * Committed to new node, setup state.
  177                          */
  178                         obss = vap->iv_bss;
  179                         vap->iv_bss = ni;
  180                         ni->ni_wdsvap = vap;
  181                 }
  182                 IEEE80211_NODE_UNLOCK(nt);
  183                 if (obss != NULL) {
  184                         /* NB: deferred to avoid recursive lock */
  185                         ieee80211_free_node(obss);
  186                 }
  187         } else {
  188                 /*
  189                  * Legacy WDS vap setup.
  190                  */
  191                 /*
  192                  * The far end does not associate so we just create
  193                  * create a new node and install it as the vap's
  194                  * bss node.  We must simulate an association and
  195                  * authorize the port for traffic to flow.
  196                  * XXX check if node already in sta table?
  197                  */
  198                 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
  199                 if (ni != NULL) {
  200                         obss = vap->iv_bss;
  201                         vap->iv_bss = ieee80211_ref_node(ni);
  202                         ni->ni_flags |= IEEE80211_NODE_AREF;
  203                         if (obss != NULL)
  204                                 ieee80211_free_node(obss);
  205                         /* give driver a chance to setup state like ni_txrate */
  206                         if (ic->ic_newassoc != NULL)
  207                                 ic->ic_newassoc(ni, 1);
  208                         /* tell the authenticator about new station */
  209                         if (vap->iv_auth->ia_node_join != NULL)
  210                                 vap->iv_auth->ia_node_join(ni);
  211                         if (ni->ni_authmode != IEEE80211_AUTH_8021X)
  212                                 ieee80211_node_authorize(ni);
  213 
  214                         ieee80211_notify_node_join(ni, 1 /*newassoc*/);
  215                         /* XXX inject l2uf frame */
  216                 }
  217         }
  218 
  219         /*
  220          * Flush any pending frames now that were setup.
  221          */
  222         if (ni != NULL)
  223                 wds_flush(ni);
  224         return (ni == NULL ? ENOENT : 0);
  225 }
  226 
  227 /*
  228  * Propagate multicast frames of an ap vap to all DWDS links.
  229  * The caller is assumed to have verified this frame is multicast.
  230  */
  231 void
  232 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
  233 {
  234         struct ieee80211com *ic = vap0->iv_ic;
  235         struct ifnet *parent = ic->ic_ifp;
  236         const struct ether_header *eh = mtod(m, const struct ether_header *);
  237         struct ieee80211_node *ni;
  238         struct ieee80211vap *vap;
  239         struct ifnet *ifp;
  240         struct mbuf *mcopy;
  241         int err;
  242 
  243         KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
  244             ("%s not mcast", ether_sprintf(eh->ether_dhost)));
  245 
  246         /* XXX locking */
  247         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  248                 /* only DWDS vaps are interesting */
  249                 if (vap->iv_opmode != IEEE80211_M_WDS ||
  250                     (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
  251                         continue;
  252                 /* if it came in this interface, don't send it back out */
  253                 ifp = vap->iv_ifp;
  254                 if (ifp == m->m_pkthdr.rcvif)
  255                         continue;
  256                 /*
  257                  * Duplicate the frame and send it.
  258                  */
  259                 mcopy = m_copypacket(m, M_DONTWAIT);
  260                 if (mcopy == NULL) {
  261                         ifp->if_oerrors++;
  262                         /* XXX stat + msg */
  263                         continue;
  264                 }
  265                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
  266                 if (ni == NULL) {
  267                         /* NB: ieee80211_find_txnode does stat+msg */
  268                         ifp->if_oerrors++;
  269                         m_freem(mcopy);
  270                         continue;
  271                 }
  272                 /* calculate priority so drivers can find the tx queue */
  273                 if (ieee80211_classify(ni, mcopy)) {
  274                         IEEE80211_DISCARD_MAC(vap,
  275                             IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
  276                             eh->ether_dhost, NULL,
  277                             "%s", "classification failure");
  278                         vap->iv_stats.is_tx_classify++;
  279                         ifp->if_oerrors++;
  280                         m_freem(mcopy);
  281                         ieee80211_free_node(ni);
  282                         continue;
  283                 }
  284 
  285                 BPF_MTAP(ifp, m);               /* 802.3 tx */
  286 
  287                 /*
  288                  * Encapsulate the packet in prep for transmission.
  289                  */
  290                 mcopy = ieee80211_encap(vap, ni, mcopy);
  291                 if (mcopy == NULL) {
  292                         /* NB: stat+msg handled in ieee80211_encap */
  293                         ieee80211_free_node(ni);
  294                         continue;
  295                 }
  296                 mcopy->m_flags |= M_MCAST;
  297                 mcopy->m_pkthdr.rcvif = (void *) ni;
  298 
  299                 err = parent->if_transmit(parent, mcopy);
  300                 if (err) {
  301                         /* NB: IFQ_HANDOFF reclaims mbuf */
  302                         ifp->if_oerrors++;
  303                         ieee80211_free_node(ni);
  304                 } else
  305                         ifp->if_opackets++;
  306         }
  307 }
  308 
  309 /*
  310  * Handle DWDS discovery on receipt of a 4-address frame in
  311  * ap mode.  Queue the frame and post an event for someone
  312  * to plumb the necessary WDS vap for this station.  Frames
  313  * received prior to the vap set running will then be reprocessed
  314  * as if they were just received.
  315  */
  316 void
  317 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
  318 {
  319         struct ieee80211com *ic = ni->ni_ic;
  320 
  321         /*
  322          * Save the frame with an aging interval 4 times
  323          * the listen interval specified by the station. 
  324          * Frames that sit around too long are reclaimed
  325          * using this information.
  326          * XXX handle overflow?
  327          * XXX per/vap beacon interval?
  328          */
  329         m->m_pkthdr.rcvif = (void *)(uintptr_t)
  330             ieee80211_mac_hash(ic, ni->ni_macaddr);
  331         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
  332             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
  333         ieee80211_notify_wds_discover(ni);
  334 }
  335 
  336 /*
  337  * IEEE80211_M_WDS vap state machine handler.
  338  */
  339 static int
  340 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  341 {
  342         struct ieee80211com *ic = vap->iv_ic;
  343         struct ieee80211_node *ni;
  344         enum ieee80211_state ostate;
  345         int error;
  346 
  347         IEEE80211_LOCK_ASSERT(ic);
  348 
  349         ostate = vap->iv_state;
  350         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
  351                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
  352         vap->iv_state = nstate;                 /* state transition */
  353         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
  354         if (ostate != IEEE80211_S_SCAN)
  355                 ieee80211_cancel_scan(vap);     /* background scan */
  356         ni = vap->iv_bss;                       /* NB: no reference held */
  357         error = 0;
  358         switch (nstate) {
  359         case IEEE80211_S_INIT:
  360                 switch (ostate) {
  361                 case IEEE80211_S_SCAN:
  362                         ieee80211_cancel_scan(vap);
  363                         break;
  364                 default:
  365                         break;
  366                 }
  367                 if (ostate != IEEE80211_S_INIT) {
  368                         /* NB: optimize INIT -> INIT case */
  369                         ieee80211_reset_bss(vap);
  370                 }
  371                 break;
  372         case IEEE80211_S_SCAN:
  373                 switch (ostate) {
  374                 case IEEE80211_S_INIT:
  375                         ieee80211_check_scan_current(vap);
  376                         break;
  377                 default:
  378                         break;
  379                 }
  380                 break;
  381         case IEEE80211_S_RUN:
  382                 if (ostate == IEEE80211_S_INIT) {
  383                         /*
  384                          * Already have a channel; bypass the scan
  385                          * and startup immediately.
  386                          */
  387                         error = ieee80211_create_wds(vap, ic->ic_curchan);
  388                 }
  389                 break;
  390         default:
  391                 break;
  392         }
  393         return error;
  394 }
  395 
  396 /*
  397  * Process a received frame.  The node associated with the sender
  398  * should be supplied.  If nothing was found in the node table then
  399  * the caller is assumed to supply a reference to iv_bss instead.
  400  * The RSSI and a timestamp are also supplied.  The RSSI data is used
  401  * during AP scanning to select a AP to associate with; it can have
  402  * any units so long as values have consistent units and higher values
  403  * mean ``better signal''.  The receive timestamp is currently not used
  404  * by the 802.11 layer.
  405  */
  406 static int
  407 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
  408 {
  409 #define HAS_SEQ(type)   ((type & 0x4) == 0)
  410         struct ieee80211vap *vap = ni->ni_vap;
  411         struct ieee80211com *ic = ni->ni_ic;
  412         struct ifnet *ifp = vap->iv_ifp;
  413         struct ieee80211_frame *wh;
  414         struct ieee80211_key *key;
  415         struct ether_header *eh;
  416         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
  417         uint8_t dir, type, subtype, qos;
  418         uint16_t rxseq;
  419 
  420         if (m->m_flags & M_AMPDU_MPDU) {
  421                 /*
  422                  * Fastpath for A-MPDU reorder q resubmission.  Frames
  423                  * w/ M_AMPDU_MPDU marked have already passed through
  424                  * here but were received out of order and been held on
  425                  * the reorder queue.  When resubmitted they are marked
  426                  * with the M_AMPDU_MPDU flag and we can bypass most of
  427                  * the normal processing.
  428                  */
  429                 wh = mtod(m, struct ieee80211_frame *);
  430                 type = IEEE80211_FC0_TYPE_DATA;
  431                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  432                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
  433                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
  434                 goto resubmit_ampdu;
  435         }
  436 
  437         KASSERT(ni != NULL, ("null node"));
  438 
  439         type = -1;                      /* undefined */
  440 
  441         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
  442                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  443                     ni->ni_macaddr, NULL,
  444                     "too short (1): len %u", m->m_pkthdr.len);
  445                 vap->iv_stats.is_rx_tooshort++;
  446                 goto out;
  447         }
  448         /*
  449          * Bit of a cheat here, we use a pointer for a 3-address
  450          * frame format but don't reference fields past outside
  451          * ieee80211_frame_min w/o first validating the data is
  452          * present.
  453          */
  454         wh = mtod(m, struct ieee80211_frame *);
  455 
  456         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
  457                 ni->ni_inact = ni->ni_inact_reload;
  458 
  459         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  460             IEEE80211_FC0_VERSION_0) {
  461                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  462                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
  463                     wh->i_fc[0], wh->i_fc[1]);
  464                 vap->iv_stats.is_rx_badversion++;
  465                 goto err;
  466         }
  467 
  468         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  469         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  470         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  471 
  472         /* NB: WDS vap's do not scan */
  473         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
  474                 IEEE80211_DISCARD_MAC(vap,
  475                     IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
  476                     "too short (3): len %u", m->m_pkthdr.len);
  477                 vap->iv_stats.is_rx_tooshort++;
  478                 goto out;
  479         }
  480         /* NB: the TA is implicitly verified by finding the wds peer node */
  481         if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
  482             !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
  483                 /* not interested in */
  484                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  485                     wh->i_addr1, NULL, "%s", "not to bss");
  486                 vap->iv_stats.is_rx_wrongbss++;
  487                 goto out;
  488         }
  489         IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
  490         ni->ni_noise = nf;
  491         if (HAS_SEQ(type)) {
  492                 uint8_t tid = ieee80211_gettid(wh);
  493                 if (IEEE80211_QOS_HAS_SEQ(wh) &&
  494                     TID_TO_WME_AC(tid) >= WME_AC_VI)
  495                         ic->ic_wme.wme_hipri_traffic++;
  496                 rxseq = le16toh(*(uint16_t *)wh->i_seq);
  497                 if (! ieee80211_check_rxseq(ni, wh)) {
  498                         /* duplicate, discard */
  499                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  500                             wh->i_addr1, "duplicate",
  501                             "seqno <%u,%u> fragno <%u,%u> tid %u",
  502                             rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
  503                             ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
  504                             rxseq & IEEE80211_SEQ_FRAG_MASK,
  505                             ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
  506                             tid);
  507                         vap->iv_stats.is_rx_dup++;
  508                         IEEE80211_NODE_STAT(ni, rx_dup);
  509                         goto out;
  510                 }
  511                 ni->ni_rxseqs[tid] = rxseq;
  512         }
  513         switch (type) {
  514         case IEEE80211_FC0_TYPE_DATA:
  515                 hdrspace = ieee80211_hdrspace(ic, wh);
  516                 if (m->m_len < hdrspace &&
  517                     (m = m_pullup(m, hdrspace)) == NULL) {
  518                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  519                             ni->ni_macaddr, NULL,
  520                             "data too short: expecting %u", hdrspace);
  521                         vap->iv_stats.is_rx_tooshort++;
  522                         goto out;               /* XXX */
  523                 }
  524                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
  525                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  526                             wh, "data", "incorrect dir 0x%x", dir);
  527                         vap->iv_stats.is_rx_wrongdir++;
  528                         goto out;
  529                 }
  530                 /*
  531                  * Only legacy WDS traffic should take this path.
  532                  */
  533                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
  534                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  535                             wh, "data", "%s", "not legacy wds");
  536                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
  537                         goto out;
  538                 }
  539                 /*
  540                  * Handle A-MPDU re-ordering.  If the frame is to be
  541                  * processed directly then ieee80211_ampdu_reorder
  542                  * will return 0; otherwise it has consumed the mbuf
  543                  * and we should do nothing more with it.
  544                  */
  545                 if ((m->m_flags & M_AMPDU) &&
  546                     ieee80211_ampdu_reorder(ni, m) != 0) {
  547                         m = NULL;
  548                         goto out;
  549                 }
  550         resubmit_ampdu:
  551 
  552                 /*
  553                  * Handle privacy requirements.  Note that we
  554                  * must not be preempted from here until after
  555                  * we (potentially) call ieee80211_crypto_demic;
  556                  * otherwise we may violate assumptions in the
  557                  * crypto cipher modules used to do delayed update
  558                  * of replay sequence numbers.
  559                  */
  560                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  561                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
  562                                 /*
  563                                  * Discard encrypted frames when privacy is off.
  564                                  */
  565                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  566                                     wh, "WEP", "%s", "PRIVACY off");
  567                                 vap->iv_stats.is_rx_noprivacy++;
  568                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
  569                                 goto out;
  570                         }
  571                         key = ieee80211_crypto_decap(ni, m, hdrspace);
  572                         if (key == NULL) {
  573                                 /* NB: stats+msgs handled in crypto_decap */
  574                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
  575                                 goto out;
  576                         }
  577                         wh = mtod(m, struct ieee80211_frame *);
  578                         wh->i_fc[1] &= ~IEEE80211_FC1_WEP;
  579                 } else {
  580                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
  581                         key = NULL;
  582                 }
  583 
  584                 /*
  585                  * Save QoS bits for use below--before we strip the header.
  586                  */
  587                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
  588                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
  589                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
  590                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
  591                 } else
  592                         qos = 0;
  593 
  594                 /*
  595                  * Next up, any fragmentation.
  596                  */
  597                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  598                         m = ieee80211_defrag(ni, m, hdrspace);
  599                         if (m == NULL) {
  600                                 /* Fragment dropped or frame not complete yet */
  601                                 goto out;
  602                         }
  603                 }
  604                 wh = NULL;              /* no longer valid, catch any uses */
  605 
  606                 /*
  607                  * Next strip any MSDU crypto bits.
  608                  */
  609                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
  610                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  611                             ni->ni_macaddr, "data", "%s", "demic error");
  612                         vap->iv_stats.is_rx_demicfail++;
  613                         IEEE80211_NODE_STAT(ni, rx_demicfail);
  614                         goto out;
  615                 }
  616 
  617                 /* copy to listener after decrypt */
  618                 if (ieee80211_radiotap_active_vap(vap))
  619                         ieee80211_radiotap_rx(vap, m);
  620                 need_tap = 0;
  621 
  622                 /*
  623                  * Finally, strip the 802.11 header.
  624                  */
  625                 m = ieee80211_decap(vap, m, hdrspace);
  626                 if (m == NULL) {
  627                         /* XXX mask bit to check for both */
  628                         /* don't count Null data frames as errors */
  629                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
  630                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
  631                                 goto out;
  632                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  633                             ni->ni_macaddr, "data", "%s", "decap error");
  634                         vap->iv_stats.is_rx_decap++;
  635                         IEEE80211_NODE_STAT(ni, rx_decap);
  636                         goto err;
  637                 }
  638                 eh = mtod(m, struct ether_header *);
  639                 if (!ieee80211_node_is_authorized(ni)) {
  640                         /*
  641                          * Deny any non-PAE frames received prior to
  642                          * authorization.  For open/shared-key
  643                          * authentication the port is mark authorized
  644                          * after authentication completes.  For 802.1x
  645                          * the port is not marked authorized by the
  646                          * authenticator until the handshake has completed.
  647                          */
  648                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
  649                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
  650                                     eh->ether_shost, "data",
  651                                     "unauthorized port: ether type 0x%x len %u",
  652                                     eh->ether_type, m->m_pkthdr.len);
  653                                 vap->iv_stats.is_rx_unauth++;
  654                                 IEEE80211_NODE_STAT(ni, rx_unauth);
  655                                 goto err;
  656                         }
  657                 } else {
  658                         /*
  659                          * When denying unencrypted frames, discard
  660                          * any non-PAE frames received without encryption.
  661                          */
  662                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
  663                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
  664                             eh->ether_type != htons(ETHERTYPE_PAE)) {
  665                                 /*
  666                                  * Drop unencrypted frames.
  667                                  */
  668                                 vap->iv_stats.is_rx_unencrypted++;
  669                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
  670                                 goto out;
  671                         }
  672                 }
  673                 /* XXX require HT? */
  674                 if (qos & IEEE80211_QOS_AMSDU) {
  675                         m = ieee80211_decap_amsdu(ni, m);
  676                         if (m == NULL)
  677                                 return IEEE80211_FC0_TYPE_DATA;
  678                 } else {
  679 #ifdef IEEE80211_SUPPORT_SUPERG
  680                         m = ieee80211_decap_fastframe(vap, ni, m);
  681                         if (m == NULL)
  682                                 return IEEE80211_FC0_TYPE_DATA;
  683 #endif
  684                 }
  685                 ieee80211_deliver_data(vap, ni, m);
  686                 return IEEE80211_FC0_TYPE_DATA;
  687 
  688         case IEEE80211_FC0_TYPE_MGT:
  689                 vap->iv_stats.is_rx_mgmt++;
  690                 IEEE80211_NODE_STAT(ni, rx_mgmt);
  691                 if (dir != IEEE80211_FC1_DIR_NODS) {
  692                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  693                             wh, "data", "incorrect dir 0x%x", dir);
  694                         vap->iv_stats.is_rx_wrongdir++;
  695                         goto err;
  696                 }
  697                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  698                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  699                             ni->ni_macaddr, "mgt", "too short: len %u",
  700                             m->m_pkthdr.len);
  701                         vap->iv_stats.is_rx_tooshort++;
  702                         goto out;
  703                 }
  704 #ifdef IEEE80211_DEBUG
  705                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
  706                         if_printf(ifp, "received %s from %s rssi %d\n",
  707                             ieee80211_mgt_subtype_name[subtype >>
  708                                 IEEE80211_FC0_SUBTYPE_SHIFT],
  709                             ether_sprintf(wh->i_addr2), rssi);
  710                 }
  711 #endif
  712                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  713                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  714                             wh, NULL, "%s", "WEP set but not permitted");
  715                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
  716                         goto out;
  717                 }
  718                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
  719                 goto out;
  720 
  721         case IEEE80211_FC0_TYPE_CTL:
  722                 vap->iv_stats.is_rx_ctl++;
  723                 IEEE80211_NODE_STAT(ni, rx_ctrl);
  724                 goto out;
  725 
  726         default:
  727                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  728                     wh, "bad", "frame type 0x%x", type);
  729                 /* should not come here */
  730                 break;
  731         }
  732 err:
  733         ifp->if_ierrors++;
  734 out:
  735         if (m != NULL) {
  736                 if (need_tap && ieee80211_radiotap_active_vap(vap))
  737                         ieee80211_radiotap_rx(vap, m);
  738                 m_freem(m);
  739         }
  740         return type;
  741 }
  742 
  743 static void
  744 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
  745         int subtype, int rssi, int nf)
  746 {
  747         struct ieee80211vap *vap = ni->ni_vap;
  748         struct ieee80211com *ic = ni->ni_ic;
  749         struct ieee80211_frame *wh;
  750         u_int8_t *frm, *efrm;
  751 
  752         wh = mtod(m0, struct ieee80211_frame *);
  753         frm = (u_int8_t *)&wh[1];
  754         efrm = mtod(m0, u_int8_t *) + m0->m_len;
  755         switch (subtype) {
  756         case IEEE80211_FC0_SUBTYPE_ACTION:
  757         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
  758                 if (ni == vap->iv_bss) {
  759                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  760                             wh, NULL, "%s", "unknown node");
  761                         vap->iv_stats.is_rx_mgtdiscard++;
  762                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
  763                         /* NB: not interested in multicast frames. */
  764                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  765                             wh, NULL, "%s", "not for us");
  766                         vap->iv_stats.is_rx_mgtdiscard++;
  767                 } else if (vap->iv_state != IEEE80211_S_RUN) {
  768                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  769                             wh, NULL, "wrong state %s",
  770                             ieee80211_state_name[vap->iv_state]);
  771                         vap->iv_stats.is_rx_mgtdiscard++;
  772                 } else {
  773                         if (ieee80211_parse_action(ni, m0) == 0)
  774                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
  775                 }
  776                 break;
  777 
  778         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
  779         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
  780         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
  781         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
  782         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  783         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  784         case IEEE80211_FC0_SUBTYPE_BEACON:
  785         case IEEE80211_FC0_SUBTYPE_ATIM:
  786         case IEEE80211_FC0_SUBTYPE_DISASSOC:
  787         case IEEE80211_FC0_SUBTYPE_AUTH:
  788         case IEEE80211_FC0_SUBTYPE_DEAUTH:
  789                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
  790                     wh, NULL, "%s", "not handled");
  791                 vap->iv_stats.is_rx_mgtdiscard++;
  792                 break;
  793 
  794         default:
  795                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
  796                     wh, "mgt", "subtype 0x%x not handled", subtype);
  797                 vap->iv_stats.is_rx_badsubtype++;
  798                 break;
  799         }
  800 }

Cache object: 63f384738937b61b831191d5805b172b


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