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


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_input.c

Version: -  FREEBSD  -  FREEBSD-13-STABLE  -  FREEBSD-13-0  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  l41  -  OPENBSD  -  linux-2.6  -  MK84  -  PLAN9  -  xnu-8792 
SearchContext: -  none  -  3  -  10 

    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("$FreeBSD$");
   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_var.h>
   44 #include <net/if_llc.h>
   45 #include <net/if_media.h>
   46 #include <net/if_vlan_var.h>
   47 
   48 #include <net80211/ieee80211_var.h>
   49 #include <net80211/ieee80211_input.h>
   50 #ifdef IEEE80211_SUPPORT_MESH
   51 #include <net80211/ieee80211_mesh.h>
   52 #endif
   53 
   54 #include <net/bpf.h>
   55 
   56 #ifdef INET
   57 #include <netinet/in.h>
   58 #include <net/ethernet.h>
   59 #endif
   60 
   61 static void
   62 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
   63 {
   64         int i;
   65 
   66         /* Verify the required MIMO bits are set */
   67         if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
   68             (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
   69                 return;
   70 
   71         /* XXX This assumes the MIMO radios have both ctl and ext chains */
   72         for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
   73                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
   74                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
   75         }
   76 
   77         /* XXX This also assumes the MIMO radios have both ctl and ext chains */
   78         for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
   79                 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
   80                 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
   81         }
   82         ni->ni_mimo_chains = rx->c_chain;
   83 }
   84 
   85 int
   86 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m,
   87     struct ieee80211_rx_stats *rx)
   88 {
   89         struct ieee80211_rx_stats rxs;
   90 
   91         if (rx) {
   92                 memcpy(&rxs, rx, sizeof(*rx));
   93         } else {
   94                 /* try to read from mbuf */
   95                 bzero(&rxs, sizeof(rxs));
   96                 ieee80211_get_rx_params(m, &rxs);
   97         }
   98 
   99         /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
  100         ieee80211_process_mimo(ni, &rxs);
  101 
  102         //return ieee80211_input(ni, m, rx->rssi, rx->nf);
  103         return ni->ni_vap->iv_input(ni, m, &rxs, rxs.rssi, rxs.nf);
  104 }
  105 
  106 int
  107 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
  108 {
  109         struct ieee80211_rx_stats rx;
  110 
  111         rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
  112         rx.nf = nf;
  113         rx.rssi = rssi;
  114         return ieee80211_input_mimo_all(ic, m, &rx);
  115 }
  116 
  117 int
  118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m,
  119     struct ieee80211_rx_stats *rx)
  120 {
  121         struct ieee80211_rx_stats rxs;
  122         struct ieee80211vap *vap;
  123         int type = -1;
  124 
  125         m->m_flags |= M_BCAST;          /* NB: mark for bpf tap'ing */
  126 
  127         if (rx) {
  128                 memcpy(&rxs, rx, sizeof(*rx));
  129         } else {
  130                 /* try to read from mbuf */
  131                 bzero(&rxs, sizeof(rxs));
  132                 ieee80211_get_rx_params(m, &rxs);
  133         }
  134 
  135         /* XXX locking */
  136         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
  137                 struct ieee80211_node *ni;
  138                 struct mbuf *mcopy;
  139 
  140                 /* NB: could check for IFF_UP but this is cheaper */
  141                 if (vap->iv_state == IEEE80211_S_INIT)
  142                         continue;
  143                 /*
  144                  * WDS vap's only receive directed traffic from the
  145                  * station at the ``far end''.  That traffic should
  146                  * be passed through the AP vap the station is associated
  147                  * to--so don't spam them with mcast frames.
  148                  */
  149                 if (vap->iv_opmode == IEEE80211_M_WDS)
  150                         continue;
  151                 if (TAILQ_NEXT(vap, iv_next) != NULL) {
  152                         /*
  153                          * Packet contents are changed by ieee80211_decap
  154                          * so do a deep copy of the packet.
  155                          */
  156                         mcopy = m_dup(m, M_NOWAIT);
  157                         if (mcopy == NULL) {
  158                                 /* XXX stat+msg */
  159                                 continue;
  160                         }
  161                 } else {
  162                         mcopy = m;
  163                         m = NULL;
  164                 }
  165                 ni = ieee80211_ref_node(vap->iv_bss);
  166                 type = ieee80211_input_mimo(ni, mcopy, &rxs);
  167                 ieee80211_free_node(ni);
  168         }
  169         if (m != NULL)                  /* no vaps, reclaim mbuf */
  170                 m_freem(m);
  171         return type;
  172 }
  173 
  174 /*
  175  * This function reassembles fragments.
  176  *
  177  * XXX should handle 3 concurrent reassemblies per-spec.
  178  */
  179 struct mbuf *
  180 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
  181 {
  182         struct ieee80211vap *vap = ni->ni_vap;
  183         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  184         struct ieee80211_frame *lwh;
  185         uint16_t rxseq;
  186         uint8_t fragno;
  187         uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
  188         struct mbuf *mfrag;
  189 
  190         KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
  191 
  192         rxseq = le16toh(*(uint16_t *)wh->i_seq);
  193         fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
  194 
  195         /* Quick way out, if there's nothing to defragment */
  196         if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
  197                 return m;
  198 
  199         /*
  200          * Remove frag to insure it doesn't get reaped by timer.
  201          */
  202         if (ni->ni_table == NULL) {
  203                 /*
  204                  * Should never happen.  If the node is orphaned (not in
  205                  * the table) then input packets should not reach here.
  206                  * Otherwise, a concurrent request that yanks the table
  207                  * should be blocked by other interlocking and/or by first
  208                  * shutting the driver down.  Regardless, be defensive
  209                  * here and just bail
  210                  */
  211                 /* XXX need msg+stat */
  212                 m_freem(m);
  213                 return NULL;
  214         }
  215         IEEE80211_NODE_LOCK(ni->ni_table);
  216         mfrag = ni->ni_rxfrag[0];
  217         ni->ni_rxfrag[0] = NULL;
  218         IEEE80211_NODE_UNLOCK(ni->ni_table);
  219 
  220         /*
  221          * Validate new fragment is in order and
  222          * related to the previous ones.
  223          */
  224         if (mfrag != NULL) {
  225                 uint16_t last_rxseq;
  226 
  227                 lwh = mtod(mfrag, struct ieee80211_frame *);
  228                 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
  229                 /* NB: check seq # and frag together */
  230                 if (rxseq == last_rxseq+1 &&
  231                     IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
  232                     IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
  233                         /* XXX clear MORE_FRAG bit? */
  234                         /* track last seqnum and fragno */
  235                         *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
  236 
  237                         m_adj(m, hdrspace);             /* strip header */
  238                         m_catpkt(mfrag, m);             /* concatenate */
  239                 } else {
  240                         /*
  241                          * Unrelated fragment or no space for it,
  242                          * clear current fragments.
  243                          */
  244                         m_freem(mfrag);
  245                         mfrag = NULL;
  246                 }
  247         }
  248 
  249         if (mfrag == NULL) {
  250                 if (fragno != 0) {              /* !first fragment, discard */
  251                         vap->iv_stats.is_rx_defrag++;
  252                         IEEE80211_NODE_STAT(ni, rx_defrag);
  253                         m_freem(m);
  254                         return NULL;
  255                 }
  256                 mfrag = m;
  257         }
  258         if (more_frag) {                        /* more to come, save */
  259                 ni->ni_rxfragstamp = ticks;
  260                 ni->ni_rxfrag[0] = mfrag;
  261                 mfrag = NULL;
  262         }
  263         return mfrag;
  264 }
  265 
  266 void
  267 ieee80211_deliver_data(struct ieee80211vap *vap,
  268         struct ieee80211_node *ni, struct mbuf *m)
  269 {
  270         struct ether_header *eh = mtod(m, struct ether_header *);
  271         struct ifnet *ifp = vap->iv_ifp;
  272 
  273         /* clear driver/net80211 flags before passing up */
  274         m->m_flags &= ~(M_MCAST | M_BCAST);
  275         m_clrprotoflags(m);
  276 
  277         /* NB: see hostap_deliver_data, this path doesn't handle hostap */
  278         KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
  279         /*
  280          * Do accounting.
  281          */
  282         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
  283         IEEE80211_NODE_STAT(ni, rx_data);
  284         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
  285         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  286                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
  287                         m->m_flags |= M_BCAST;
  288                 else
  289                         m->m_flags |= M_MCAST;
  290                 IEEE80211_NODE_STAT(ni, rx_mcast);
  291         } else
  292                 IEEE80211_NODE_STAT(ni, rx_ucast);
  293         m->m_pkthdr.rcvif = ifp;
  294 
  295         if (ni->ni_vlan != 0) {
  296                 /* attach vlan tag */
  297                 m->m_pkthdr.ether_vtag = ni->ni_vlan;
  298                 m->m_flags |= M_VLANTAG;
  299         }
  300         ifp->if_input(ifp, m);
  301 }
  302 
  303 struct mbuf *
  304 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
  305 {
  306         struct ieee80211_qosframe_addr4 wh;
  307         struct ether_header *eh;
  308         struct llc *llc;
  309 
  310         KASSERT(hdrlen <= sizeof(wh),
  311             ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
  312 
  313         if (m->m_len < hdrlen + sizeof(*llc) &&
  314             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
  315                 vap->iv_stats.is_rx_tooshort++;
  316                 /* XXX msg */
  317                 return NULL;
  318         }
  319         memcpy(&wh, mtod(m, caddr_t), hdrlen);
  320         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
  321         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
  322             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
  323             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
  324             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
  325             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
  326               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
  327                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
  328                 llc = NULL;
  329         } else {
  330                 m_adj(m, hdrlen - sizeof(*eh));
  331         }
  332         eh = mtod(m, struct ether_header *);
  333         switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
  334         case IEEE80211_FC1_DIR_NODS:
  335                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
  336                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
  337                 break;
  338         case IEEE80211_FC1_DIR_TODS:
  339                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
  340                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
  341                 break;
  342         case IEEE80211_FC1_DIR_FROMDS:
  343                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
  344                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
  345                 break;
  346         case IEEE80211_FC1_DIR_DSTODS:
  347                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
  348                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
  349                 break;
  350         }
  351 #ifndef __NO_STRICT_ALIGNMENT
  352         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
  353                 m = ieee80211_realign(vap, m, sizeof(*eh));
  354                 if (m == NULL)
  355                         return NULL;
  356         }
  357 #endif /* !__NO_STRICT_ALIGNMENT */
  358         if (llc != NULL) {
  359                 eh = mtod(m, struct ether_header *);
  360                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
  361         }
  362         return m;
  363 }
  364 
  365 /*
  366  * Decap a frame encapsulated in a fast-frame/A-MSDU.
  367  */
  368 struct mbuf *
  369 ieee80211_decap1(struct mbuf *m, int *framelen)
  370 {
  371 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
  372         struct ether_header *eh;
  373         struct llc *llc;
  374 
  375         /*
  376          * The frame has an 802.3 header followed by an 802.2
  377          * LLC header.  The encapsulated frame length is in the
  378          * first header type field; save that and overwrite it 
  379          * with the true type field found in the second.  Then
  380          * copy the 802.3 header up to where it belongs and
  381          * adjust the mbuf contents to remove the void.
  382          */
  383         if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
  384                 return NULL;
  385         eh = mtod(m, struct ether_header *);    /* 802.3 header is first */
  386         llc = (struct llc *)&eh[1];             /* 802.2 header follows */
  387         *framelen = ntohs(eh->ether_type)       /* encap'd frame size */
  388                   + sizeof(struct ether_header) - sizeof(struct llc);
  389         eh->ether_type = llc->llc_un.type_snap.ether_type;
  390         ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
  391                 sizeof(struct ether_header));
  392         m_adj(m, sizeof(struct llc));
  393         return m;
  394 #undef FF_LLC_SIZE
  395 }
  396 
  397 /*
  398  * Install received rate set information in the node's state block.
  399  */
  400 int
  401 ieee80211_setup_rates(struct ieee80211_node *ni,
  402         const uint8_t *rates, const uint8_t *xrates, int flags)
  403 {
  404         struct ieee80211vap *vap = ni->ni_vap;
  405         struct ieee80211_rateset *rs = &ni->ni_rates;
  406 
  407         memset(rs, 0, sizeof(*rs));
  408         rs->rs_nrates = rates[1];
  409         memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
  410         if (xrates != NULL) {
  411                 uint8_t nxrates;
  412                 /*
  413                  * Tack on 11g extended supported rate element.
  414                  */
  415                 nxrates = xrates[1];
  416                 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
  417                         nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
  418                         IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
  419                             "extended rate set too large; only using "
  420                             "%u of %u rates", nxrates, xrates[1]);
  421                         vap->iv_stats.is_rx_rstoobig++;
  422                 }
  423                 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
  424                 rs->rs_nrates += nxrates;
  425         }
  426         return ieee80211_fix_rate(ni, rs, flags);
  427 }
  428 
  429 /*
  430  * Send a management frame error response to the specified
  431  * station.  If ni is associated with the station then use
  432  * it; otherwise allocate a temporary node suitable for
  433  * transmitting the frame and then free the reference so
  434  * it will go away as soon as the frame has been transmitted.
  435  */
  436 void
  437 ieee80211_send_error(struct ieee80211_node *ni,
  438         const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
  439 {
  440         struct ieee80211vap *vap = ni->ni_vap;
  441         int istmp;
  442 
  443         if (ni == vap->iv_bss) {
  444                 if (vap->iv_state != IEEE80211_S_RUN) {
  445                         /*
  446                          * XXX hack until we get rid of this routine.
  447                          * We can be called prior to the vap reaching
  448                          * run state under certain conditions in which
  449                          * case iv_bss->ni_chan will not be setup.
  450                          * Check for this explicitly and and just ignore
  451                          * the request.
  452                          */
  453                         return;
  454                 }
  455                 ni = ieee80211_tmp_node(vap, mac);
  456                 if (ni == NULL) {
  457                         /* XXX msg */
  458                         return;
  459                 }
  460                 istmp = 1;
  461         } else
  462                 istmp = 0;
  463         IEEE80211_SEND_MGMT(ni, subtype, arg);
  464         if (istmp)
  465                 ieee80211_free_node(ni);
  466 }
  467 
  468 int
  469 ieee80211_alloc_challenge(struct ieee80211_node *ni)
  470 {
  471         if (ni->ni_challenge == NULL)
  472                 ni->ni_challenge = (uint32_t *)
  473                     IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
  474                       M_80211_NODE, IEEE80211_M_NOWAIT);
  475         if (ni->ni_challenge == NULL) {
  476                 IEEE80211_NOTE(ni->ni_vap,
  477                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
  478                     "%s", "shared key challenge alloc failed");
  479                 /* XXX statistic */
  480         }
  481         return (ni->ni_challenge != NULL);
  482 }
  483 
  484 /*
  485  * Parse a Beacon or ProbeResponse frame and return the
  486  * useful information in an ieee80211_scanparams structure.
  487  * Status is set to 0 if no problems were found; otherwise
  488  * a bitmask of IEEE80211_BPARSE_* items is returned that
  489  * describes the problems detected.
  490  */
  491 int
  492 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
  493         struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
  494 {
  495         struct ieee80211vap *vap = ni->ni_vap;
  496         struct ieee80211com *ic = ni->ni_ic;
  497         struct ieee80211_frame *wh;
  498         uint8_t *frm, *efrm;
  499 
  500         wh = mtod(m, struct ieee80211_frame *);
  501         frm = (uint8_t *)&wh[1];
  502         efrm = mtod(m, uint8_t *) + m->m_len;
  503         scan->status = 0;
  504         /*
  505          * beacon/probe response frame format
  506          *      [8] time stamp
  507          *      [2] beacon interval
  508          *      [2] capability information
  509          *      [tlv] ssid
  510          *      [tlv] supported rates
  511          *      [tlv] country information
  512          *      [tlv] channel switch announcement (CSA)
  513          *      [tlv] parameter set (FH/DS)
  514          *      [tlv] erp information
  515          *      [tlv] extended supported rates
  516          *      [tlv] WME
  517          *      [tlv] WPA or RSN
  518          *      [tlv] HT capabilities
  519          *      [tlv] HT information
  520          *      [tlv] Atheros capabilities
  521          *      [tlv] Mesh ID
  522          *      [tlv] Mesh Configuration
  523          */
  524         IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
  525             return (scan->status = IEEE80211_BPARSE_BADIELEN));
  526         memset(scan, 0, sizeof(*scan));
  527         scan->tstamp  = frm;                            frm += 8;
  528         scan->bintval = le16toh(*(uint16_t *)frm);      frm += 2;
  529         scan->capinfo = le16toh(*(uint16_t *)frm);      frm += 2;
  530         scan->bchan = ieee80211_chan2ieee(ic, rxchan);
  531         scan->chan = scan->bchan;
  532         scan->ies = frm;
  533         scan->ies_len = efrm - frm;
  534 
  535         while (efrm - frm > 1) {
  536                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
  537                     return (scan->status = IEEE80211_BPARSE_BADIELEN));
  538                 switch (*frm) {
  539                 case IEEE80211_ELEMID_SSID:
  540                         scan->ssid = frm;
  541                         break;
  542                 case IEEE80211_ELEMID_RATES:
  543                         scan->rates = frm;
  544                         break;
  545                 case IEEE80211_ELEMID_COUNTRY:
  546                         scan->country = frm;
  547                         break;
  548                 case IEEE80211_ELEMID_CSA:
  549                         scan->csa = frm;
  550                         break;
  551                 case IEEE80211_ELEMID_QUIET:
  552                         scan->quiet = frm;
  553                         break;
  554                 case IEEE80211_ELEMID_FHPARMS:
  555                         if (ic->ic_phytype == IEEE80211_T_FH) {
  556                                 scan->fhdwell = le16dec(&frm[2]);
  557                                 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
  558                                 scan->fhindex = frm[6];
  559                         }
  560                         break;
  561                 case IEEE80211_ELEMID_DSPARMS:
  562                         /*
  563                          * XXX hack this since depending on phytype
  564                          * is problematic for multi-mode devices.
  565                          */
  566                         if (ic->ic_phytype != IEEE80211_T_FH)
  567                                 scan->chan = frm[2];
  568                         break;
  569                 case IEEE80211_ELEMID_TIM:
  570                         /* XXX ATIM? */
  571                         scan->tim = frm;
  572                         scan->timoff = frm - mtod(m, uint8_t *);
  573                         break;
  574                 case IEEE80211_ELEMID_IBSSPARMS:
  575                 case IEEE80211_ELEMID_CFPARMS:
  576                 case IEEE80211_ELEMID_PWRCNSTR:
  577                 case IEEE80211_ELEMID_BSSLOAD:
  578                 case IEEE80211_ELEMID_APCHANREP:
  579                         /* NB: avoid debugging complaints */
  580                         break;
  581                 case IEEE80211_ELEMID_XRATES:
  582                         scan->xrates = frm;
  583                         break;
  584                 case IEEE80211_ELEMID_ERP:
  585                         if (frm[1] != 1) {
  586                                 IEEE80211_DISCARD_IE(vap,
  587                                     IEEE80211_MSG_ELEMID, wh, "ERP",
  588                                     "bad len %u", frm[1]);
  589                                 vap->iv_stats.is_rx_elem_toobig++;
  590                                 break;
  591                         }
  592                         scan->erp = frm[2] | 0x100;
  593                         break;
  594                 case IEEE80211_ELEMID_HTCAP:
  595                         scan->htcap = frm;
  596                         break;
  597                 case IEEE80211_ELEMID_RSN:
  598                         scan->rsn = frm;
  599                         break;
  600                 case IEEE80211_ELEMID_HTINFO:
  601                         scan->htinfo = frm;
  602                         break;
  603 #ifdef IEEE80211_SUPPORT_MESH
  604                 case IEEE80211_ELEMID_MESHID:
  605                         scan->meshid = frm;
  606                         break;
  607                 case IEEE80211_ELEMID_MESHCONF:
  608                         scan->meshconf = frm;
  609                         break;
  610 #endif
  611                 /* Extended capabilities; nothing handles it for now */
  612                 case IEEE80211_ELEMID_EXTCAP:
  613                         break;
  614                 case IEEE80211_ELEMID_VENDOR:
  615                         if (iswpaoui(frm))
  616                                 scan->wpa = frm;
  617                         else if (iswmeparam(frm) || iswmeinfo(frm))
  618                                 scan->wme = frm;
  619 #ifdef IEEE80211_SUPPORT_SUPERG
  620                         else if (isatherosoui(frm))
  621                                 scan->ath = frm;
  622 #endif
  623 #ifdef IEEE80211_SUPPORT_TDMA
  624                         else if (istdmaoui(frm))
  625                                 scan->tdma = frm;
  626 #endif
  627                         else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
  628                                 /*
  629                                  * Accept pre-draft HT ie's if the
  630                                  * standard ones have not been seen.
  631                                  */
  632                                 if (ishtcapoui(frm)) {
  633                                         if (scan->htcap == NULL)
  634                                                 scan->htcap = frm;
  635                                 } else if (ishtinfooui(frm)) {
  636                                         if (scan->htinfo == NULL)
  637                                                 scan->htcap = frm;
  638                                 }
  639                         }
  640                         break;
  641                 default:
  642                         IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
  643                             wh, "unhandled",
  644                             "id %u, len %u", *frm, frm[1]);
  645                         vap->iv_stats.is_rx_elem_unknown++;
  646                         break;
  647                 }
  648                 frm += frm[1] + 2;
  649         }
  650         IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
  651             scan->status |= IEEE80211_BPARSE_RATES_INVALID);
  652         if (scan->rates != NULL && scan->xrates != NULL) {
  653                 /*
  654                  * NB: don't process XRATES if RATES is missing.  This
  655                  * avoids a potential null ptr deref and should be ok
  656                  * as the return code will already note RATES is missing
  657                  * (so callers shouldn't otherwise process the frame).
  658                  */
  659                 IEEE80211_VERIFY_ELEMENT(scan->xrates,
  660                     IEEE80211_RATE_MAXSIZE - scan->rates[1],
  661                     scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
  662         }
  663         IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
  664             scan->status |= IEEE80211_BPARSE_SSID_INVALID);
  665         if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
  666                 /*
  667                  * Frame was received on a channel different from the
  668                  * one indicated in the DS params element id;
  669                  * silently discard it.
  670                  *
  671                  * NB: this can happen due to signal leakage.
  672                  *     But we should take it for FH phy because
  673                  *     the rssi value should be correct even for
  674                  *     different hop pattern in FH.
  675                  */
  676                 IEEE80211_DISCARD(vap,
  677                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
  678                     wh, NULL, "for off-channel %u (bchan=%u)",
  679                     scan->chan, scan->bchan);
  680                 vap->iv_stats.is_rx_chanmismatch++;
  681                 scan->status |= IEEE80211_BPARSE_OFFCHAN;
  682         }
  683         if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
  684               scan->bintval <= IEEE80211_BINTVAL_MAX)) {
  685                 IEEE80211_DISCARD(vap,
  686                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
  687                     wh, NULL, "bogus beacon interval (%d TU)",
  688                     (int) scan->bintval);
  689                 vap->iv_stats.is_rx_badbintval++;
  690                 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
  691         }
  692         if (scan->country != NULL) {
  693                 /*
  694                  * Validate we have at least enough data to extract
  695                  * the country code.  Not sure if we should return an
  696                  * error instead of discarding the IE; consider this
  697                  * being lenient as we don't depend on the data for
  698                  * correct operation.
  699                  */
  700                 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
  701                     scan->country = NULL);
  702         }
  703         if (scan->csa != NULL) {
  704                 /*
  705                  * Validate Channel Switch Announcement; this must
  706                  * be the correct length or we toss the frame.
  707                  */
  708                 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
  709                     scan->status |= IEEE80211_BPARSE_CSA_INVALID);
  710         }
  711 #ifdef IEEE80211_SUPPORT_MESH
  712         if (scan->meshid != NULL) {
  713                 IEEE80211_VERIFY_ELEMENT(scan->meshid, IEEE80211_MESHID_LEN,
  714                     scan->status |= IEEE80211_BPARSE_RATES_INVALID);
  715         }
  716 #endif
  717         /*
  718          * Process HT ie's.  This is complicated by our
  719          * accepting both the standard ie's and the pre-draft
  720          * vendor OUI ie's that some vendors still use/require.
  721          */
  722         if (scan->htcap != NULL) {
  723                 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
  724                      scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
  725                          4 + sizeof(struct ieee80211_ie_htcap)-2 :
  726                          sizeof(struct ieee80211_ie_htcap)-2,
  727                      scan->htcap = NULL);
  728         }
  729         if (scan->htinfo != NULL) {
  730                 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
  731                      scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
  732                          4 + sizeof(struct ieee80211_ie_htinfo)-2 :
  733                          sizeof(struct ieee80211_ie_htinfo)-2,
  734                      scan->htinfo = NULL);
  735         }
  736         return scan->status;
  737 }
  738 
  739 /*
  740  * Parse an Action frame.  Return 0 on success, non-zero on failure.
  741  */
  742 int
  743 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
  744 {
  745         struct ieee80211vap *vap = ni->ni_vap;
  746         const struct ieee80211_action *ia;
  747         struct ieee80211_frame *wh;
  748         uint8_t *frm, *efrm;
  749 
  750         /*
  751          * action frame format:
  752          *      [1] category
  753          *      [1] action
  754          *      [tlv] parameters
  755          */
  756         wh = mtod(m, struct ieee80211_frame *);
  757         frm = (u_int8_t *)&wh[1];
  758         efrm = mtod(m, u_int8_t *) + m->m_len;
  759         IEEE80211_VERIFY_LENGTH(efrm - frm,
  760                 sizeof(struct ieee80211_action), return EINVAL);
  761         ia = (const struct ieee80211_action *) frm;
  762 
  763         vap->iv_stats.is_rx_action++;
  764         IEEE80211_NODE_STAT(ni, rx_action);
  765 
  766         /* verify frame payloads but defer processing */
  767         switch (ia->ia_category) {
  768         case IEEE80211_ACTION_CAT_BA:
  769                 switch (ia->ia_action) {
  770                 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
  771                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  772                             sizeof(struct ieee80211_action_ba_addbarequest),
  773                             return EINVAL);
  774                         break;
  775                 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
  776                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  777                             sizeof(struct ieee80211_action_ba_addbaresponse),
  778                             return EINVAL);
  779                         break;
  780                 case IEEE80211_ACTION_BA_DELBA:
  781                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  782                             sizeof(struct ieee80211_action_ba_delba),
  783                             return EINVAL);
  784                         break;
  785                 }
  786                 break;
  787         case IEEE80211_ACTION_CAT_HT:
  788                 switch (ia->ia_action) {
  789                 case IEEE80211_ACTION_HT_TXCHWIDTH:
  790                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  791                             sizeof(struct ieee80211_action_ht_txchwidth),
  792                             return EINVAL);
  793                         break;
  794                 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
  795                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  796                             sizeof(struct ieee80211_action_ht_mimopowersave),
  797                             return EINVAL);
  798                         break;
  799                 }
  800                 break;
  801 #ifdef IEEE80211_SUPPORT_MESH
  802         case IEEE80211_ACTION_CAT_MESH:
  803                 switch (ia->ia_action) {
  804                 case IEEE80211_ACTION_MESH_LMETRIC:
  805                         /*
  806                          * XXX: verification is true only if we are using
  807                          * Airtime link metric (default)
  808                          */
  809                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  810                             sizeof(struct ieee80211_meshlmetric_ie),
  811                             return EINVAL);
  812                         break;
  813                 case IEEE80211_ACTION_MESH_HWMP:
  814                         /* verify something */
  815                         break;
  816                 case IEEE80211_ACTION_MESH_GANN:
  817                         IEEE80211_VERIFY_LENGTH(efrm - frm,
  818                             sizeof(struct ieee80211_meshgann_ie),
  819                             return EINVAL);
  820                         break;
  821                 case IEEE80211_ACTION_MESH_CC:
  822                 case IEEE80211_ACTION_MESH_MCCA_SREQ:
  823                 case IEEE80211_ACTION_MESH_MCCA_SREP:
  824                 case IEEE80211_ACTION_MESH_MCCA_AREQ:
  825                 case IEEE80211_ACTION_MESH_MCCA_ADVER:
  826                 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
  827                 case IEEE80211_ACTION_MESH_TBTT_REQ:
  828                 case IEEE80211_ACTION_MESH_TBTT_RES:
  829                         /* reject these early on, not implemented */
  830                         IEEE80211_DISCARD(vap,
  831                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
  832                             wh, NULL, "not implemented yet, act=0x%02X",
  833                             ia->ia_action);
  834                         return EINVAL;
  835                 }
  836                 break;
  837         case IEEE80211_ACTION_CAT_SELF_PROT:
  838                 /* If TA or RA group address discard silently */
  839                 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
  840                         IEEE80211_IS_MULTICAST(wh->i_addr2))
  841                         return EINVAL;
  842                 /*
  843                  * XXX: Should we verify complete length now or it is
  844                  * to varying in sizes?
  845                  */
  846                 switch (ia->ia_action) {
  847                 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
  848                 case IEEE80211_ACTION_MESHPEERING_CLOSE:
  849                         /* is not a peering candidate (yet) */
  850                         if (ni == vap->iv_bss)
  851                                 return EINVAL;
  852                         break;
  853                 }
  854                 break;
  855 #endif
  856         }
  857         return 0;
  858 }
  859 
  860 #ifdef IEEE80211_DEBUG
  861 /*
  862  * Debugging support.
  863  */
  864 void
  865 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
  866         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
  867 {
  868         printf("[%s] discard %s frame, ssid mismatch: ",
  869                 ether_sprintf(mac), tag);
  870         ieee80211_print_essid(ssid + 2, ssid[1]);
  871         printf("\n");
  872 }
  873 
  874 /*
  875  * Return the bssid of a frame.
  876  */
  877 static const uint8_t *
  878 ieee80211_getbssid(const struct ieee80211vap *vap,
  879         const struct ieee80211_frame *wh)
  880 {
  881         if (vap->iv_opmode == IEEE80211_M_STA)
  882                 return wh->i_addr2;
  883         if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
  884                 return wh->i_addr1;
  885         if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
  886                 return wh->i_addr1;
  887         return wh->i_addr3;
  888 }
  889 
  890 #include <machine/stdarg.h>
  891 
  892 void
  893 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
  894 {
  895         char buf[128];          /* XXX */
  896         va_list ap;
  897 
  898         va_start(ap, fmt);
  899         vsnprintf(buf, sizeof(buf), fmt, ap);
  900         va_end(ap);
  901 
  902         if_printf(vap->iv_ifp, "%s", buf);      /* NB: no \n */
  903 }
  904 
  905 void
  906 ieee80211_note_frame(const struct ieee80211vap *vap,
  907         const struct ieee80211_frame *wh,
  908         const char *fmt, ...)
  909 {
  910         char buf[128];          /* XXX */
  911         va_list ap;
  912 
  913         va_start(ap, fmt);
  914         vsnprintf(buf, sizeof(buf), fmt, ap);
  915         va_end(ap);
  916         if_printf(vap->iv_ifp, "[%s] %s\n",
  917                 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
  918 }
  919 
  920 void
  921 ieee80211_note_mac(const struct ieee80211vap *vap,
  922         const uint8_t mac[IEEE80211_ADDR_LEN],
  923         const char *fmt, ...)
  924 {
  925         char buf[128];          /* XXX */
  926         va_list ap;
  927 
  928         va_start(ap, fmt);
  929         vsnprintf(buf, sizeof(buf), fmt, ap);
  930         va_end(ap);
  931         if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
  932 }
  933 
  934 void
  935 ieee80211_discard_frame(const struct ieee80211vap *vap,
  936         const struct ieee80211_frame *wh,
  937         const char *type, const char *fmt, ...)
  938 {
  939         va_list ap;
  940 
  941         if_printf(vap->iv_ifp, "[%s] discard ",
  942                 ether_sprintf(ieee80211_getbssid(vap, wh)));
  943         printf("%s frame, ", type != NULL ? type :
  944             ieee80211_mgt_subtype_name(wh->i_fc[0]));
  945         va_start(ap, fmt);
  946         vprintf(fmt, ap);
  947         va_end(ap);
  948         printf("\n");
  949 }
  950 
  951 void
  952 ieee80211_discard_ie(const struct ieee80211vap *vap,
  953         const struct ieee80211_frame *wh,
  954         const char *type, const char *fmt, ...)
  955 {
  956         va_list ap;
  957 
  958         if_printf(vap->iv_ifp, "[%s] discard ",
  959                 ether_sprintf(ieee80211_getbssid(vap, wh)));
  960         if (type != NULL)
  961                 printf("%s information element, ", type);
  962         else
  963                 printf("information element, ");
  964         va_start(ap, fmt);
  965         vprintf(fmt, ap);
  966         va_end(ap);
  967         printf("\n");
  968 }
  969 
  970 void
  971 ieee80211_discard_mac(const struct ieee80211vap *vap,
  972         const uint8_t mac[IEEE80211_ADDR_LEN],
  973         const char *type, const char *fmt, ...)
  974 {
  975         va_list ap;
  976 
  977         if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
  978         if (type != NULL)
  979                 printf("%s frame, ", type);
  980         else
  981                 printf("frame, ");
  982         va_start(ap, fmt);
  983         vprintf(fmt, ap);
  984         va_end(ap);
  985         printf("\n");
  986 }
  987 #endif /* IEEE80211_DEBUG */

Cache object: f866f4b6215fcc8d15d5561057860ffe


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.