The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_input.c

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.1/sys/net80211/ieee80211_input.c 206355 2010-04-07 14:59:07Z rpaulo $");
   29 
   30 #include "opt_wlan.h"
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/mbuf.h>   
   35 #include <sys/malloc.h>
   36 #include <sys/endian.h>
   37 #include <sys/kernel.h>
   38  
   39 #include <sys/socket.h>
   40  
   41 #include <net/ethernet.h>
   42 #include <net/if.h>
   43 #include <net/if_llc.h>
   44 #include <net/if_media.h>
   45 #include <net/if_vlan_var.h>
   46 
   47 #include <net80211/ieee80211_var.h>
   48 #include <net80211/ieee80211_input.h>
   49 #ifdef IEEE80211_SUPPORT_MESH
   50 #include <net80211/ieee80211_mesh.h>
   51 #endif
   52 
   53 #include <net/bpf.h>
   54 
   55 #ifdef INET
   56 #include <netinet/in.h>
   57 #include <net/ethernet.h>
   58 #endif
   59 
   60 int
   61 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
   62 {
   63         struct ieee80211vap *vap;
   64         int type = -1;
   65 
   66         m->m_flags |= M_BCAST;          /* NB: mark for bpf tap'ing */
   67 
   68         /* XXX locking */
   69         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
   70                 struct ieee80211_node *ni;
   71                 struct mbuf *mcopy;
   72 
   73                 /* NB: could check for IFF_UP but this is cheaper */
   74                 if (vap->iv_state == IEEE80211_S_INIT)
   75                         continue;
   76                 /*
   77                  * WDS vap's only receive directed traffic from the
   78                  * station at the ``far end''.  That traffic should
   79                  * be passed through the AP vap the station is associated
   80                  * to--so don't spam them with mcast frames.
   81                  */
   82                 if (vap->iv_opmode == IEEE80211_M_WDS)
   83                         continue;
   84                 if (TAILQ_NEXT(vap, iv_next) != NULL) {
   85                         /*
   86                          * Packet contents are changed by ieee80211_decap
   87                          * so do a deep copy of the packet.
   88                          */
   89                         mcopy = m_dup(m, M_DONTWAIT);
   90                         if (mcopy == NULL) {
   91                                 /* XXX stat+msg */
   92                                 continue;
   93                         }
   94                 } else {
   95                         mcopy = m;
   96                         m = NULL;
   97                 }
   98                 ni = ieee80211_ref_node(vap->iv_bss);
   99                 type = ieee80211_input(ni, mcopy, rssi, nf);
  100                 ieee80211_free_node(ni);
  101         }
  102         if (m != NULL)                  /* no vaps, reclaim mbuf */
  103                 m_freem(m);
  104         return type;
  105 }
  106 
  107 /*
  108  * This function reassembles fragments.
  109  *
  110  * XXX should handle 3 concurrent reassemblies per-spec.
  111  */
  112 struct mbuf *
  113 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
  114 {
  115         struct ieee80211vap *vap = ni->ni_vap;
  116         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  117         struct ieee80211_frame *lwh;
  118         uint16_t rxseq;
  119         uint8_t fragno;
  120         uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
  121         struct mbuf *mfrag;
  122 
  123         KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
  124 
  125         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  126         fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
  127 
  128         /* Quick way out, if there's nothing to defragment */
  129         if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
  130                 return m;
  131 
  132         /*
  133          * Remove frag to insure it doesn't get reaped by timer.
  134          */
  135         if (ni->ni_table == NULL) {
  136                 /*
  137                  * Should never happen.  If the node is orphaned (not in
  138                  * the table) then input packets should not reach here.
  139                  * Otherwise, a concurrent request that yanks the table
  140                  * should be blocked by other interlocking and/or by first
  141                  * shutting the driver down.  Regardless, be defensive
  142                  * here and just bail
  143                  */
  144                 /* XXX need msg+stat */
  145                 m_freem(m);
  146                 return NULL;
  147         }
  148         IEEE80211_NODE_LOCK(ni->ni_table);
  149         mfrag = ni->ni_rxfrag[0];
  150         ni->ni_rxfrag[0] = NULL;
  151         IEEE80211_NODE_UNLOCK(ni->ni_table);
  152 
  153         /*
  154          * Validate new fragment is in order and
  155          * related to the previous ones.
  156          */
  157         if (mfrag != NULL) {
  158                 uint16_t last_rxseq;
  159 
  160                 lwh = mtod(mfrag, struct ieee80211_frame *);
  161                 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
  162                 /* NB: check seq # and frag together */
  163                 if (rxseq != last_rxseq+1 ||
  164                     !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) ||
  165                     !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
  166                         /*
  167                          * Unrelated fragment or no space for it,
  168                          * clear current fragments.
  169                          */
  170                         m_freem(mfrag);
  171                         mfrag = NULL;
  172                 }
  173         }
  174 
  175         if (mfrag == NULL) {
  176                 if (fragno != 0) {              /* !first fragment, discard */
  177                         vap->iv_stats.is_rx_defrag++;
  178                         IEEE80211_NODE_STAT(ni, rx_defrag);
  179                         m_freem(m);
  180                         return NULL;
  181                 }
  182                 mfrag = m;
  183         } else {                                /* concatenate */
  184                 m_adj(m, hdrspace);             /* strip header */
  185                 m_cat(mfrag, m);
  186                 /* NB: m_cat doesn't update the packet header */
  187                 mfrag->m_pkthdr.len += m->m_pkthdr.len;
  188                 /* track last seqnum and fragno */
  189                 lwh = mtod(mfrag, struct ieee80211_frame *);
  190                 *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
  191         }
  192         if (more_frag) {                        /* more to come, save */
  193                 ni->ni_rxfragstamp = ticks;
  194                 ni->ni_rxfrag[0] = mfrag;
  195                 mfrag = NULL;
  196         }
  197         return mfrag;
  198 }
  199 
  200 void
  201 ieee80211_deliver_data(struct ieee80211vap *vap,
  202         struct ieee80211_node *ni, struct mbuf *m)
  203 {
  204         struct ether_header *eh = mtod(m, struct ether_header *);
  205         struct ifnet *ifp = vap->iv_ifp;
  206 
  207         /* clear driver/net80211 flags before passing up */
  208         m->m_flags &= ~(M_80211_RX | M_MCAST | M_BCAST);
  209 
  210         /* NB: see hostap_deliver_data, this path doesn't handle hostap */
  211         KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
  212         /*
  213          * Do accounting.
  214          */
  215         ifp->if_ipackets++;
  216         IEEE80211_NODE_STAT(ni, rx_data);
  217         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
  218         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  219                 m->m_flags |= M_MCAST;          /* XXX M_BCAST? */
  220                 IEEE80211_NODE_STAT(ni, rx_mcast);
  221         } else
  222                 IEEE80211_NODE_STAT(ni, rx_ucast);
  223         m->m_pkthdr.rcvif = ifp;
  224 
  225         if (ni->ni_vlan != 0) {
  226                 /* attach vlan tag */
  227                 m->m_pkthdr.ether_vtag = ni->ni_vlan;
  228                 m->m_flags |= M_VLANTAG;
  229         }
  230         ifp->if_input(ifp, m);
  231 }
  232 
  233 struct mbuf *
  234 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
  235 {
  236         struct ieee80211_qosframe_addr4 wh;
  237         struct ether_header *eh;
  238         struct llc *llc;
  239 
  240         KASSERT(hdrlen <= sizeof(wh),
  241             ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
  242 
  243         if (m->m_len < hdrlen + sizeof(*llc) &&
  244             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
  245                 vap->iv_stats.is_rx_tooshort++;
  246                 /* XXX msg */
  247                 return NULL;
  248         }
  249         memcpy(&wh, mtod(m, caddr_t), hdrlen);
  250         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
  251         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
  252             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
  253             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
  254             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
  255             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
  256               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
  257                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
  258                 llc = NULL;
  259         } else {
  260                 m_adj(m, hdrlen - sizeof(*eh));
  261         }
  262         eh = mtod(m, struct ether_header *);
  263         switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
  264         case IEEE80211_FC1_DIR_NODS:
  265                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
  266                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
  267                 break;
  268         case IEEE80211_FC1_DIR_TODS:
  269                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
  270                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
  271                 break;
  272         case IEEE80211_FC1_DIR_FROMDS:
  273                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
  274                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
  275                 break;
  276         case IEEE80211_FC1_DIR_DSTODS:
  277                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
  278                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
  279                 break;
  280         }
  281 #ifdef ALIGNED_POINTER
  282         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
  283                 m = ieee80211_realign(vap, m, sizeof(*eh));
  284                 if (m == NULL)
  285                         return NULL;
  286         }
  287 #endif /* ALIGNED_POINTER */
  288         if (llc != NULL) {
  289                 eh = mtod(m, struct ether_header *);
  290                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
  291         }
  292         return m;
  293 }
  294 
  295 /*
  296  * Decap a frame encapsulated in a fast-frame/A-MSDU.
  297  */
  298 struct mbuf *
  299 ieee80211_decap1(struct mbuf *m, int *framelen)
  300 {
  301 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
  302         struct ether_header *eh;
  303         struct llc *llc;
  304 
  305         /*
  306          * The frame has an 802.3 header followed by an 802.2
  307          * LLC header.  The encapsulated frame length is in the
  308          * first header type field; save that and overwrite it 
  309          * with the true type field found in the second.  Then
  310          * copy the 802.3 header up to where it belongs and
  311          * adjust the mbuf contents to remove the void.
  312          */
  313         if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
  314                 return NULL;
  315         eh = mtod(m, struct ether_header *);    /* 802.3 header is first */
  316         llc = (struct llc *)&eh[1];             /* 802.2 header follows */
  317         *framelen = ntohs(eh->ether_type)       /* encap'd frame size */
  318                   + sizeof(struct ether_header) - sizeof(struct llc);
  319         eh->ether_type = llc->llc_un.type_snap.ether_type;
  320         ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
  321                 sizeof(struct ether_header));
  322         m_adj(m, sizeof(struct llc));
  323         return m;
  324 #undef FF_LLC_SIZE
  325 }
  326 
  327 /*
  328  * Install received rate set information in the node's state block.
  329  */
  330 int
  331 ieee80211_setup_rates(struct ieee80211_node *ni,
  332         const uint8_t *rates, const uint8_t *xrates, int flags)
  333 {
  334         struct ieee80211vap *vap = ni->ni_vap;
  335         struct ieee80211_rateset *rs = &ni->ni_rates;
  336 
  337         memset(rs, 0, sizeof(*rs));
  338         rs->rs_nrates = rates[1];
  339         memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
  340         if (xrates != NULL) {
  341                 uint8_t nxrates;
  342                 /*
  343                  * Tack on 11g extended supported rate element.
  344                  */
  345                 nxrates = xrates[1];
  346                 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
  347                         nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
  348                         IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
  349                             "extended rate set too large; only using "
  350                             "%u of %u rates", nxrates, xrates[1]);
  351                         vap->iv_stats.is_rx_rstoobig++;
  352                 }
  353                 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
  354                 rs->rs_nrates += nxrates;
  355         }
  356         return ieee80211_fix_rate(ni, rs, flags);
  357 }
  358 
  359 /*
  360  * Send a management frame error response to the specified
  361  * station.  If ni is associated with the station then use
  362  * it; otherwise allocate a temporary node suitable for
  363  * transmitting the frame and then free the reference so
  364  * it will go away as soon as the frame has been transmitted.
  365  */
  366 void
  367 ieee80211_send_error(struct ieee80211_node *ni,
  368         const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
  369 {
  370         struct ieee80211vap *vap = ni->ni_vap;
  371         int istmp;
  372 
  373         if (ni == vap->iv_bss) {
  374                 if (vap->iv_state != IEEE80211_S_RUN) {
  375                         /*
  376                          * XXX hack until we get rid of this routine.
  377                          * We can be called prior to the vap reaching
  378                          * run state under certain conditions in which
  379                          * case iv_bss->ni_chan will not be setup.
  380                          * Check for this explicitly and and just ignore
  381                          * the request.
  382                          */
  383                         return;
  384                 }
  385                 ni = ieee80211_tmp_node(vap, mac);
  386                 if (ni == NULL) {
  387                         /* XXX msg */
  388                         return;
  389                 }
  390                 istmp = 1;
  391         } else
  392                 istmp = 0;
  393         IEEE80211_SEND_MGMT(ni, subtype, arg);
  394         if (istmp)
  395                 ieee80211_free_node(ni);
  396 }
  397 
  398 int
  399 ieee80211_alloc_challenge(struct ieee80211_node *ni)
  400 {
  401         if (ni->ni_challenge == NULL)
  402                 ni->ni_challenge = (uint32_t *) malloc(IEEE80211_CHALLENGE_LEN,
  403                     M_80211_NODE, M_NOWAIT);
  404         if (ni->ni_challenge == NULL) {
  405                 IEEE80211_NOTE(ni->ni_vap,
  406                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
  407                     "%s", "shared key challenge alloc failed");
  408                 /* XXX statistic */
  409         }
  410         return (ni->ni_challenge != NULL);
  411 }
  412 
  413 /*
  414  * Parse a Beacon or ProbeResponse frame and return the
  415  * useful information in an ieee80211_scanparams structure.
  416  * Status is set to 0 if no problems were found; otherwise
  417  * a bitmask of IEEE80211_BPARSE_* items is returned that
  418  * describes the problems detected.
  419  */
  420 int
  421 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
  422         struct ieee80211_scanparams *scan)
  423 {
  424         struct ieee80211vap *vap = ni->ni_vap;
  425         struct ieee80211com *ic = ni->ni_ic;
  426         struct ieee80211_frame *wh;
  427         uint8_t *frm, *efrm;
  428 
  429         wh = mtod(m, struct ieee80211_frame *);
  430         frm = (uint8_t *)&wh[1];
  431         efrm = mtod(m, uint8_t *) + m->m_len;
  432         scan->status = 0;
  433         /*
  434          * beacon/probe response frame format
  435          *      [8] time stamp
  436          *      [2] beacon interval
  437          *      [2] capability information
  438          *      [tlv] ssid
  439          *      [tlv] supported rates
  440          *      [tlv] country information
  441          *      [tlv] channel switch announcement (CSA)
  442          *      [tlv] parameter set (FH/DS)
  443          *      [tlv] erp information
  444          *      [tlv] extended supported rates
  445          *      [tlv] WME
  446          *      [tlv] WPA or RSN
  447          *      [tlv] HT capabilities
  448          *      [tlv] HT information
  449          *      [tlv] Atheros capabilities
  450          *      [tlv] Mesh ID
  451          *      [tlv] Mesh Configuration
  452          */
  453         IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
  454             return (scan->status = IEEE80211_BPARSE_BADIELEN));
  455         memset(scan, 0, sizeof(*scan));
  456         scan->tstamp  = frm;                            frm += 8;
  457         scan->bintval = le16toh(*(uint16_t *)frm);      frm += 2;
  458         scan->capinfo = le16toh(*(uint16_t *)frm);      frm += 2;
  459         scan->bchan = ieee80211_chan2ieee(ic, ic->ic_curchan);
  460         scan->chan = scan->bchan;
  461         scan->ies = frm;
  462         scan->ies_len = efrm - frm;
  463 
  464         while (efrm - frm > 1) {
  465                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
  466                     return (scan->status = IEEE80211_BPARSE_BADIELEN));
  467                 switch (*frm) {
  468                 case IEEE80211_ELEMID_SSID:
  469                         scan->ssid = frm;
  470                         break;
  471                 case IEEE80211_ELEMID_RATES:
  472                         scan->rates = frm;
  473                         break;
  474                 case IEEE80211_ELEMID_COUNTRY:
  475                         scan->country = frm;
  476                         break;
  477                 case IEEE80211_ELEMID_CSA:
  478                         scan->csa = frm;
  479                         break;
  480                 case IEEE80211_ELEMID_FHPARMS:
  481                         if (ic->ic_phytype == IEEE80211_T_FH) {
  482                                 scan->fhdwell = LE_READ_2(&frm[2]);
  483                                 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
  484                                 scan->fhindex = frm[6];
  485                         }
  486                         break;
  487                 case IEEE80211_ELEMID_DSPARMS:
  488                         /*
  489                          * XXX hack this since depending on phytype
  490                          * is problematic for multi-mode devices.
  491                          */
  492                         if (ic->ic_phytype != IEEE80211_T_FH)
  493                                 scan->chan = frm[2];
  494                         break;
  495                 case IEEE80211_ELEMID_TIM:
  496                         /* XXX ATIM? */
  497                         scan->tim = frm;
  498                         scan->timoff = frm - mtod(m, uint8_t *);
  499                         break;
  500                 case IEEE80211_ELEMID_IBSSPARMS:
  501                 case IEEE80211_ELEMID_CFPARMS:
  502                 case IEEE80211_ELEMID_PWRCNSTR:
  503                         /* NB: avoid debugging complaints */
  504                         break;
  505                 case IEEE80211_ELEMID_XRATES:
  506                         scan->xrates = frm;
  507                         break;
  508                 case IEEE80211_ELEMID_ERP:
  509                         if (frm[1] != 1) {
  510                                 IEEE80211_DISCARD_IE(vap,
  511                                     IEEE80211_MSG_ELEMID, wh, "ERP",
  512                                     "bad len %u", frm[1]);
  513                                 vap->iv_stats.is_rx_elem_toobig++;
  514                                 break;
  515                         }
  516                         scan->erp = frm[2] | 0x100;
  517                         break;
  518                 case IEEE80211_ELEMID_HTCAP:
  519                         scan->htcap = frm;
  520                         break;
  521                 case IEEE80211_ELEMID_RSN:
  522                         scan->rsn = frm;
  523                         break;
  524                 case IEEE80211_ELEMID_HTINFO:
  525                         scan->htinfo = frm;
  526                         break;
  527 #ifdef IEEE80211_SUPPORT_MESH
  528                 case IEEE80211_ELEMID_MESHID:
  529                         scan->meshid = frm;
  530                         break;
  531                 case IEEE80211_ELEMID_MESHCONF:
  532                         scan->meshconf = frm;
  533                         break;
  534 #endif
  535                 case IEEE80211_ELEMID_VENDOR:
  536                         if (iswpaoui(frm))
  537                                 scan->wpa = frm;
  538                         else if (iswmeparam(frm) || iswmeinfo(frm))
  539                                 scan->wme = frm;
  540 #ifdef IEEE80211_SUPPORT_SUPERG
  541                         else if (isatherosoui(frm))
  542                                 scan->ath = frm;
  543 #endif
  544 #ifdef IEEE80211_SUPPORT_TDMA
  545                         else if (istdmaoui(frm))
  546                                 scan->tdma = frm;
  547 #endif
  548                         else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
  549                                 /*
  550                                  * Accept pre-draft HT ie's if the
  551                                  * standard ones have not been seen.
  552                                  */
  553                                 if (ishtcapoui(frm)) {
  554                                         if (scan->htcap == NULL)
  555                                                 scan->htcap = frm;
  556                                 } else if (ishtinfooui(frm)) {
  557                                         if (scan->htinfo == NULL)
  558                                                 scan->htcap = frm;
  559                                 }
  560                         }
  561                         break;
  562                 default:
  563                         IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
  564                             wh, "unhandled",
  565                             "id %u, len %u", *frm, frm[1]);
  566                         vap->iv_stats.is_rx_elem_unknown++;
  567                         break;
  568                 }
  569                 frm += frm[1] + 2;
  570         }
  571         IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
  572             scan->status |= IEEE80211_BPARSE_RATES_INVALID);
  573         if (scan->rates != NULL && scan->xrates != NULL) {
  574                 /*
  575                  * NB: don't process XRATES if RATES is missing.  This
  576                  * avoids a potential null ptr deref and should be ok
  577                  * as the return code will already note RATES is missing
  578                  * (so callers shouldn't otherwise process the frame).
  579                  */
  580                 IEEE80211_VERIFY_ELEMENT(scan->xrates,
  581                     IEEE80211_RATE_MAXSIZE - scan->rates[1],
  582                     scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
  583         }
  584         IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
  585             scan->status |= IEEE80211_BPARSE_SSID_INVALID);
  586         if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
  587                 /*
  588                  * Frame was received on a channel different from the
  589                  * one indicated in the DS params element id;
  590                  * silently discard it.
  591                  *
  592                  * NB: this can happen due to signal leakage.
  593                  *     But we should take it for FH phy because
  594                  *     the rssi value should be correct even for
  595                  *     different hop pattern in FH.
  596                  */
  597                 IEEE80211_DISCARD(vap,
  598                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
  599                     wh, NULL, "for off-channel %u", scan->chan);
  600                 vap->iv_stats.is_rx_chanmismatch++;
  601                 scan->status |= IEEE80211_BPARSE_OFFCHAN;
  602         }
  603         if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
  604               scan->bintval <= IEEE80211_BINTVAL_MAX)) {
  605                 IEEE80211_DISCARD(vap,
  606                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
  607                     wh, NULL, "bogus beacon interval", scan->bintval);
  608                 vap->iv_stats.is_rx_badbintval++;
  609                 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
  610         }
  611         if (scan->country != NULL) {
  612                 /*
  613                  * Validate we have at least enough data to extract
  614                  * the country code.  Not sure if we should return an
  615                  * error instead of discarding the IE; consider this
  616                  * being lenient as we don't depend on the data for
  617                  * correct operation.
  618                  */
  619                 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
  620                     scan->country = NULL);
  621         }
  622         if (scan->csa != NULL) {
  623                 /*
  624                  * Validate Channel Switch Announcement; this must
  625                  * be the correct length or we toss the frame.
  626                  */
  627                 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
  628                     scan->status |= IEEE80211_BPARSE_CSA_INVALID);
  629         }
  630         /*
  631          * Process HT ie's.  This is complicated by our
  632          * accepting both the standard ie's and the pre-draft
  633          * vendor OUI ie's that some vendors still use/require.
  634          */
  635         if (scan->htcap != NULL) {
  636                 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
  637                      scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
  638                          4 + sizeof(struct ieee80211_ie_htcap)-2 :
  639                          sizeof(struct ieee80211_ie_htcap)-2,
  640                      scan->htcap = NULL);
  641         }
  642         if (scan->htinfo != NULL) {
  643                 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
  644                      scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
  645                          4 + sizeof(struct ieee80211_ie_htinfo)-2 :
  646                          sizeof(struct ieee80211_ie_htinfo)-2,
  647                      scan->htinfo = NULL);
  648         }
  649         return scan->status;
  650 }
  651 
  652 /*
  653  * Parse an Action frame.  Return 0 on success, non-zero on failure.
  654  */
  655 int
  656 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
  657 {
  658         struct ieee80211vap *vap = ni->ni_vap;
  659         const struct ieee80211_action *ia;
  660         struct ieee80211_frame *wh;
  661         uint8_t *frm, *efrm;
  662 
  663         /*
  664          * action frame format:
  665          *      [1] category
  666          *      [1] action
  667          *      [tlv] parameters
  668          */
  669         wh = mtod(m, struct ieee80211_frame *);
  670         frm = (u_int8_t *)&wh[1];
  671         efrm = mtod(m, u_int8_t *) + m->m_len;
  672         IEEE80211_VERIFY_LENGTH(efrm - frm,
  673                 sizeof(struct ieee80211_action), return EINVAL);
  674         ia = (const struct ieee80211_action *) frm;
  675 
  676         vap->iv_stats.is_rx_action++;
  677         IEEE80211_NODE_STAT(ni, rx_action);
  678 
  679         /* verify frame payloads but defer processing */
  680         /* XXX maybe push this to method */
  681         switch (ia->ia_category) {
  682         case IEEE80211_ACTION_CAT_BA:
  683                 switch (ia->ia_action) {
  684                 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
  685                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  686                             sizeof(struct ieee80211_action_ba_addbarequest),
  687                             return EINVAL);
  688                         break;
  689                 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
  690                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  691                             sizeof(struct ieee80211_action_ba_addbaresponse),
  692                             return EINVAL);
  693                         break;
  694                 case IEEE80211_ACTION_BA_DELBA:
  695                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  696                             sizeof(struct ieee80211_action_ba_delba),
  697                             return EINVAL);
  698                         break;
  699                 }
  700                 break;
  701         case IEEE80211_ACTION_CAT_HT:
  702                 switch (ia->ia_action) {
  703                 case IEEE80211_ACTION_HT_TXCHWIDTH:
  704                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  705                             sizeof(struct ieee80211_action_ht_txchwidth),
  706                             return EINVAL);
  707                         break;
  708                 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
  709                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  710                             sizeof(struct ieee80211_action_ht_mimopowersave),
  711                             return EINVAL);
  712                         break;
  713                 }
  714                 break;
  715         }
  716         return 0;
  717 }
  718 
  719 #ifdef IEEE80211_DEBUG
  720 /*
  721  * Debugging support.
  722  */
  723 void
  724 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
  725         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
  726 {
  727         printf("[%s] discard %s frame, ssid mismatch: ",
  728                 ether_sprintf(mac), tag);
  729         ieee80211_print_essid(ssid + 2, ssid[1]);
  730         printf("\n");
  731 }
  732 
  733 /*
  734  * Return the bssid of a frame.
  735  */
  736 static const uint8_t *
  737 ieee80211_getbssid(const struct ieee80211vap *vap,
  738         const struct ieee80211_frame *wh)
  739 {
  740         if (vap->iv_opmode == IEEE80211_M_STA)
  741                 return wh->i_addr2;
  742         if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
  743                 return wh->i_addr1;
  744         if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
  745                 return wh->i_addr1;
  746         return wh->i_addr3;
  747 }
  748 
  749 #include <machine/stdarg.h>
  750 
  751 void
  752 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
  753 {
  754         char buf[128];          /* XXX */
  755         va_list ap;
  756 
  757         va_start(ap, fmt);
  758         vsnprintf(buf, sizeof(buf), fmt, ap);
  759         va_end(ap);
  760 
  761         if_printf(vap->iv_ifp, "%s", buf);      /* NB: no \n */
  762 }
  763 
  764 void
  765 ieee80211_note_frame(const struct ieee80211vap *vap,
  766         const struct ieee80211_frame *wh,
  767         const char *fmt, ...)
  768 {
  769         char buf[128];          /* XXX */
  770         va_list ap;
  771 
  772         va_start(ap, fmt);
  773         vsnprintf(buf, sizeof(buf), fmt, ap);
  774         va_end(ap);
  775         if_printf(vap->iv_ifp, "[%s] %s\n",
  776                 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
  777 }
  778 
  779 void
  780 ieee80211_note_mac(const struct ieee80211vap *vap,
  781         const uint8_t mac[IEEE80211_ADDR_LEN],
  782         const char *fmt, ...)
  783 {
  784         char buf[128];          /* XXX */
  785         va_list ap;
  786 
  787         va_start(ap, fmt);
  788         vsnprintf(buf, sizeof(buf), fmt, ap);
  789         va_end(ap);
  790         if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
  791 }
  792 
  793 void
  794 ieee80211_discard_frame(const struct ieee80211vap *vap,
  795         const struct ieee80211_frame *wh,
  796         const char *type, const char *fmt, ...)
  797 {
  798         va_list ap;
  799 
  800         if_printf(vap->iv_ifp, "[%s] discard ",
  801                 ether_sprintf(ieee80211_getbssid(vap, wh)));
  802         if (type == NULL) {
  803                 printf("%s frame, ", ieee80211_mgt_subtype_name[
  804                         (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >>
  805                         IEEE80211_FC0_SUBTYPE_SHIFT]);
  806         } else
  807                 printf("%s frame, ", type);
  808         va_start(ap, fmt);
  809         vprintf(fmt, ap);
  810         va_end(ap);
  811         printf("\n");
  812 }
  813 
  814 void
  815 ieee80211_discard_ie(const struct ieee80211vap *vap,
  816         const struct ieee80211_frame *wh,
  817         const char *type, const char *fmt, ...)
  818 {
  819         va_list ap;
  820 
  821         if_printf(vap->iv_ifp, "[%s] discard ",
  822                 ether_sprintf(ieee80211_getbssid(vap, wh)));
  823         if (type != NULL)
  824                 printf("%s information element, ", type);
  825         else
  826                 printf("information element, ");
  827         va_start(ap, fmt);
  828         vprintf(fmt, ap);
  829         va_end(ap);
  830         printf("\n");
  831 }
  832 
  833 void
  834 ieee80211_discard_mac(const struct ieee80211vap *vap,
  835         const uint8_t mac[IEEE80211_ADDR_LEN],
  836         const char *type, const char *fmt, ...)
  837 {
  838         va_list ap;
  839 
  840         if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
  841         if (type != NULL)
  842                 printf("%s frame, ", type);
  843         else
  844                 printf("frame, ");
  845         va_start(ap, fmt);
  846         vprintf(fmt, ap);
  847         va_end(ap);
  848         printf("\n");
  849 }
  850 #endif /* IEEE80211_DEBUG */

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