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


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

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002, 2003 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  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * Alternatively, this software may be distributed under the terms of the
   18  * GNU General Public License ("GPL") version 2 as published by the Free
   19  * Software Foundation.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/5.2/sys/net80211/ieee80211_input.c 121181 2003-10-17 23:59:11Z sam $");
   35 
   36 #include "opt_inet.h"
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h> 
   40 #include <sys/mbuf.h>   
   41 #include <sys/malloc.h>
   42 #include <sys/kernel.h>
   43 #include <sys/socket.h>
   44 #include <sys/sockio.h>
   45 #include <sys/endian.h>
   46 #include <sys/errno.h>
   47 #include <sys/bus.h>
   48 #include <sys/proc.h>
   49 #include <sys/sysctl.h>
   50 
   51 #include <machine/atomic.h>
   52  
   53 #include <net/if.h>
   54 #include <net/if_dl.h>
   55 #include <net/if_media.h>
   56 #include <net/if_arp.h>
   57 #include <net/ethernet.h>
   58 #include <net/if_llc.h>
   59 
   60 #include <net80211/ieee80211_var.h>
   61 
   62 #include <net/bpf.h>
   63 
   64 #ifdef INET
   65 #include <netinet/in.h> 
   66 #include <netinet/if_ether.h>
   67 #endif
   68 
   69 /*
   70  * Process a received frame.  The node associated with the sender
   71  * should be supplied.  If nothing was found in the node table then
   72  * the caller is assumed to supply a reference to ic_bss instead.
   73  * The RSSI and a timestamp are also supplied.  The RSSI data is used
   74  * during AP scanning to select a AP to associate with; it can have
   75  * any units so long as values have consistent units and higher values
   76  * mean ``better signal''.  The receive timestamp is currently not used
   77  * by the 802.11 layer.
   78  */
   79 void
   80 ieee80211_input(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node *ni,
   81         int rssi, u_int32_t rstamp)
   82 {
   83         struct ieee80211com *ic = (void *)ifp;
   84         struct ieee80211_frame *wh;
   85         struct ether_header *eh;
   86         struct mbuf *m1;
   87         int len;
   88         u_int8_t dir, type, subtype;
   89         u_int8_t *bssid;
   90         u_int16_t rxseq;
   91 
   92         KASSERT(ni != NULL, ("null node"));
   93 
   94         /* trim CRC here so WEP can find its own CRC at the end of packet. */
   95         if (m->m_flags & M_HASFCS) {
   96                 m_adj(m, -IEEE80211_CRC_LEN);
   97                 m->m_flags &= ~M_HASFCS;
   98         }
   99         KASSERT(m->m_pkthdr.len >= sizeof(struct ieee80211_frame_min),
  100                 ("frame length too short: %u", m->m_pkthdr.len));
  101 
  102         /*
  103          * In monitor mode, send everything directly to bpf.
  104          * XXX may want to include the CRC
  105          */
  106         if (ic->ic_opmode == IEEE80211_M_MONITOR)
  107                 goto out;
  108 
  109         wh = mtod(m, struct ieee80211_frame *);
  110         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  111             IEEE80211_FC0_VERSION_0) {
  112                 if (ifp->if_flags & IFF_DEBUG)
  113                         if_printf(ifp, "receive packet with wrong version: %x\n",
  114                             wh->i_fc[0]);
  115                 ieee80211_unref_node(&ni);
  116                 ic->ic_stats.is_rx_badversion++;
  117                 goto err;
  118         }
  119 
  120         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
  121         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
  122         /*
  123          * NB: We are not yet prepared to handle control frames,
  124          *     but permitting drivers to send them to us allows
  125          *     them to go through bpf tapping at the 802.11 layer.
  126          */
  127         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
  128                 /* XXX statistic */
  129                 IEEE80211_DPRINTF2(("%s: frame too short, len %u\n",
  130                         __func__, m->m_pkthdr.len));
  131                 ic->ic_stats.is_rx_tooshort++;
  132                 goto out;               /* XXX */
  133         }
  134         if (ic->ic_state != IEEE80211_S_SCAN) {
  135                 switch (ic->ic_opmode) {
  136                 case IEEE80211_M_STA:
  137                         if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) {
  138                                 /* not interested in */
  139                                 IEEE80211_DPRINTF2(("%s: discard frame from "
  140                                         "bss %s\n", __func__,
  141                                         ether_sprintf(wh->i_addr2)));
  142                                 ic->ic_stats.is_rx_wrongbss++;
  143                                 goto out;
  144                         }
  145                         break;
  146                 case IEEE80211_M_IBSS:
  147                 case IEEE80211_M_AHDEMO:
  148                 case IEEE80211_M_HOSTAP:
  149                         if (dir == IEEE80211_FC1_DIR_NODS)
  150                                 bssid = wh->i_addr3;
  151                         else
  152                                 bssid = wh->i_addr1;
  153                         if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) &&
  154                             !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) {
  155                                 /* not interested in */
  156                                 IEEE80211_DPRINTF2(("%s: discard frame from "
  157                                         "bss %s\n", __func__,
  158                                         ether_sprintf(bssid)));
  159                                 ic->ic_stats.is_rx_wrongbss++;
  160                                 goto out;
  161                         }
  162                         break;
  163                 case IEEE80211_M_MONITOR:
  164                         goto out;
  165                 default:
  166                         /* XXX catch bad values */
  167                         break;
  168                 }
  169                 ni->ni_rssi = rssi;
  170                 ni->ni_rstamp = rstamp;
  171                 rxseq = ni->ni_rxseq;
  172                 ni->ni_rxseq =
  173                     le16toh(*(u_int16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT;
  174                 /* TODO: fragment */
  175                 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
  176                     rxseq == ni->ni_rxseq) {
  177                         /* duplicate, silently discarded */
  178                         ic->ic_stats.is_rx_dup++; /* XXX per-station stat */
  179                         goto out;
  180                 }
  181                 ni->ni_inact = 0;
  182         }
  183 
  184         switch (type) {
  185         case IEEE80211_FC0_TYPE_DATA:
  186                 switch (ic->ic_opmode) {
  187                 case IEEE80211_M_STA:
  188                         if (dir != IEEE80211_FC1_DIR_FROMDS) {
  189                                 ic->ic_stats.is_rx_wrongdir++;
  190                                 goto out;
  191                         }
  192                         if ((ifp->if_flags & IFF_SIMPLEX) &&
  193                             IEEE80211_IS_MULTICAST(wh->i_addr1) &&
  194                             IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) {
  195                                 /*
  196                                  * In IEEE802.11 network, multicast packet
  197                                  * sent from me is broadcasted from AP.
  198                                  * It should be silently discarded for
  199                                  * SIMPLEX interface.
  200                                  */
  201                                 ic->ic_stats.is_rx_mcastecho++;
  202                                 goto out;
  203                         }
  204                         break;
  205                 case IEEE80211_M_IBSS:
  206                 case IEEE80211_M_AHDEMO:
  207                         if (dir != IEEE80211_FC1_DIR_NODS) {
  208                                 ic->ic_stats.is_rx_wrongdir++;
  209                                 goto out;
  210                         }
  211                         break;
  212                 case IEEE80211_M_HOSTAP:
  213                         if (dir != IEEE80211_FC1_DIR_TODS) {
  214                                 ic->ic_stats.is_rx_wrongdir++;
  215                                 goto out;
  216                         }
  217                         /* check if source STA is associated */
  218                         if (ni == ic->ic_bss) {
  219                                 IEEE80211_DPRINTF(("%s: data from unknown src "
  220                                         "%s\n", __func__,
  221                                         ether_sprintf(wh->i_addr2)));
  222                                 /* NB: caller deals with reference */
  223                                 ni = ieee80211_dup_bss(ic, wh->i_addr2);
  224                                 if (ni != NULL) {
  225                                         IEEE80211_SEND_MGMT(ic, ni,
  226                                             IEEE80211_FC0_SUBTYPE_DEAUTH,
  227                                             IEEE80211_REASON_NOT_AUTHED);
  228                                         ieee80211_free_node(ic, ni);
  229                                 }
  230                                 ic->ic_stats.is_rx_notassoc++;
  231                                 goto err;
  232                         }
  233                         if (ni->ni_associd == 0) {
  234                                 IEEE80211_DPRINTF(("ieee80211_input: "
  235                                     "data from unassoc src %s\n",
  236                                     ether_sprintf(wh->i_addr2)));
  237                                 IEEE80211_SEND_MGMT(ic, ni,
  238                                     IEEE80211_FC0_SUBTYPE_DISASSOC,
  239                                     IEEE80211_REASON_NOT_ASSOCED);
  240                                 ieee80211_unref_node(&ni);
  241                                 ic->ic_stats.is_rx_notassoc++;
  242                                 goto err;
  243                         }
  244                         break;
  245                 case IEEE80211_M_MONITOR:
  246                         break;
  247                 }
  248                 if (wh->i_fc[1] & IEEE80211_FC1_WEP) {
  249                         if (ic->ic_flags & IEEE80211_F_WEPON) {
  250                                 m = ieee80211_wep_crypt(ifp, m, 0);
  251                                 if (m == NULL) {
  252                                         ic->ic_stats.is_rx_wepfail++;
  253                                         goto err;
  254                                 }
  255                                 wh = mtod(m, struct ieee80211_frame *);
  256                         } else {
  257                                 ic->ic_stats.is_rx_nowep++;
  258                                 goto out;
  259                         }
  260                 }
  261                 /* copy to listener after decrypt */
  262                 if (ic->ic_rawbpf)
  263                         bpf_mtap(ic->ic_rawbpf, m);
  264                 m = ieee80211_decap(ifp, m);
  265                 if (m == NULL) {
  266                         ic->ic_stats.is_rx_decap++;
  267                         goto err;
  268                 }
  269                 ifp->if_ipackets++;
  270 
  271                 /* perform as a bridge within the AP */
  272                 m1 = NULL;
  273                 if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
  274                         eh = mtod(m, struct ether_header *);
  275                         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  276                                 m1 = m_copypacket(m, M_DONTWAIT);
  277                                 if (m1 == NULL)
  278                                         ifp->if_oerrors++;
  279                                 else
  280                                         m1->m_flags |= M_MCAST;
  281                         } else {
  282                                 ni = ieee80211_find_node(ic, eh->ether_dhost);
  283                                 if (ni != NULL) {
  284                                         if (ni->ni_associd != 0) {
  285                                                 m1 = m;
  286                                                 m = NULL;
  287                                         }
  288                                         ieee80211_unref_node(&ni);
  289                                 }
  290                         }
  291                         if (m1 != NULL) {
  292 #ifdef ALTQ
  293                                 if (ALTQ_IS_ENABLED(&ifp->if_snd))
  294                                         altq_etherclassify(&ifp->if_snd, m1,
  295                                             &pktattr);
  296 #endif
  297                                 len = m1->m_pkthdr.len;
  298                                 IF_ENQUEUE(&ifp->if_snd, m1);
  299                                 if (m != NULL)
  300                                         ifp->if_omcasts++;
  301                                 ifp->if_obytes += len;
  302                         }
  303                 }
  304                 if (m != NULL)
  305                         (*ifp->if_input)(ifp, m);
  306                 return;
  307 
  308         case IEEE80211_FC0_TYPE_MGT:
  309                 if (dir != IEEE80211_FC1_DIR_NODS) {
  310                         ic->ic_stats.is_rx_wrongdir++;
  311                         goto err;
  312                 }
  313                 if (ic->ic_opmode == IEEE80211_M_AHDEMO) {
  314                         ic->ic_stats.is_rx_ahdemo_mgt++;
  315                         goto out;
  316                 }
  317                 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
  318 
  319                 /* drop frames without interest */
  320                 if (ic->ic_state == IEEE80211_S_SCAN) {
  321                         if (subtype != IEEE80211_FC0_SUBTYPE_BEACON &&
  322                             subtype != IEEE80211_FC0_SUBTYPE_PROBE_RESP) {
  323                                 ic->ic_stats.is_rx_mgtdiscard++;
  324                                 goto out;
  325                         }
  326                 } else {
  327                         if (ic->ic_opmode != IEEE80211_M_IBSS &&
  328                             subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
  329                                 ic->ic_stats.is_rx_mgtdiscard++;
  330                                 goto out;
  331                         }
  332                 }
  333 
  334                 if (ifp->if_flags & IFF_DEBUG) {
  335                         /* avoid to print too many frames */
  336                         int doprint = 0;
  337 
  338                         switch (subtype) {
  339                         case IEEE80211_FC0_SUBTYPE_BEACON:
  340                                 if (ic->ic_state == IEEE80211_S_SCAN)
  341                                         doprint = 1;
  342                                 break;
  343                         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
  344                                 if (ic->ic_opmode == IEEE80211_M_IBSS)
  345                                         doprint = 1;
  346                                 break;
  347                         default:
  348                                 doprint = 1;
  349                                 break;
  350                         }
  351 #ifdef IEEE80211_DEBUG
  352                         doprint += ieee80211_debug;
  353 #endif
  354                         if (doprint)
  355                                 if_printf(ifp, "received %s from %s rssi %d\n",
  356                                     ieee80211_mgt_subtype_name[subtype
  357                                     >> IEEE80211_FC0_SUBTYPE_SHIFT],
  358                                     ether_sprintf(wh->i_addr2), rssi);
  359                 }
  360                 if (ic->ic_rawbpf)
  361                         bpf_mtap(ic->ic_rawbpf, m);
  362                 (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp);
  363                 m_freem(m);
  364                 return;
  365 
  366         case IEEE80211_FC0_TYPE_CTL:
  367                 ic->ic_stats.is_rx_ctl++;
  368                 goto out;
  369         default:
  370                 IEEE80211_DPRINTF(("%s: bad type %x\n", __func__, type));
  371                 /* should not come here */
  372                 break;
  373         }
  374   err:
  375         ifp->if_ierrors++;
  376   out:
  377         if (m != NULL) {
  378                 if (ic->ic_rawbpf)
  379                         bpf_mtap(ic->ic_rawbpf, m);
  380                 m_freem(m);
  381         }
  382 }
  383 
  384 struct mbuf *
  385 ieee80211_decap(struct ifnet *ifp, struct mbuf *m)
  386 {
  387         struct ether_header *eh;
  388         struct ieee80211_frame wh;
  389         struct llc *llc;
  390 
  391         if (m->m_len < sizeof(wh) + sizeof(*llc)) {
  392                 m = m_pullup(m, sizeof(wh) + sizeof(*llc));
  393                 if (m == NULL)
  394                         return NULL;
  395         }
  396         memcpy(&wh, mtod(m, caddr_t), sizeof(wh));
  397         llc = (struct llc *)(mtod(m, caddr_t) + sizeof(wh));
  398         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
  399             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
  400             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) {
  401                 m_adj(m, sizeof(wh) + sizeof(struct llc) - sizeof(*eh));
  402                 llc = NULL;
  403         } else {
  404                 m_adj(m, sizeof(wh) - sizeof(*eh));
  405         }
  406         eh = mtod(m, struct ether_header *);
  407         switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
  408         case IEEE80211_FC1_DIR_NODS:
  409                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
  410                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
  411                 break;
  412         case IEEE80211_FC1_DIR_TODS:
  413                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
  414                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
  415                 break;
  416         case IEEE80211_FC1_DIR_FROMDS:
  417                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
  418                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
  419                 break;
  420         case IEEE80211_FC1_DIR_DSTODS:
  421                 /* not yet supported */
  422                 IEEE80211_DPRINTF(("%s: DS to DS\n", __func__));
  423                 m_freem(m);
  424                 return NULL;
  425         }
  426 #ifdef ALIGNED_POINTER
  427         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), u_int32_t)) {
  428                 struct mbuf *n, *n0, **np;
  429                 caddr_t newdata;
  430                 int off, pktlen;
  431 
  432                 n0 = NULL;
  433                 np = &n0;
  434                 off = 0;
  435                 pktlen = m->m_pkthdr.len;
  436                 while (pktlen > off) {
  437                         if (n0 == NULL) {
  438                                 MGETHDR(n, M_DONTWAIT, MT_DATA);
  439                                 if (n == NULL) {
  440                                         m_freem(m);
  441                                         return NULL;
  442                                 }
  443                                 M_MOVE_PKTHDR(n, m);
  444                                 n->m_len = MHLEN;
  445                         } else {
  446                                 MGET(n, M_DONTWAIT, MT_DATA);
  447                                 if (n == NULL) {
  448                                         m_freem(m);
  449                                         m_freem(n0);
  450                                         return NULL;
  451                                 }
  452                                 n->m_len = MLEN;
  453                         }
  454                         if (pktlen - off >= MINCLSIZE) {
  455                                 MCLGET(n, M_DONTWAIT);
  456                                 if (n->m_flags & M_EXT)
  457                                         n->m_len = n->m_ext.ext_size;
  458                         }
  459                         if (n0 == NULL) {
  460                                 newdata =
  461                                     (caddr_t)ALIGN(n->m_data + sizeof(*eh)) -
  462                                     sizeof(*eh);
  463                                 n->m_len -= newdata - n->m_data;
  464                                 n->m_data = newdata;
  465                         }
  466                         if (n->m_len > pktlen - off)
  467                                 n->m_len = pktlen - off;
  468                         m_copydata(m, off, n->m_len, mtod(n, caddr_t));
  469                         off += n->m_len;
  470                         *np = n;
  471                         np = &n->m_next;
  472                 }
  473                 m_freem(m);
  474                 m = n0;
  475         }
  476 #endif /* ALIGNED_POINTER */
  477         if (llc != NULL) {
  478                 eh = mtod(m, struct ether_header *);
  479                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
  480         }
  481         return m;
  482 }
  483 
  484 /*
  485  * Install received rate set information in the node's state block.
  486  */
  487 static int
  488 ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni,
  489         u_int8_t *rates, u_int8_t *xrates, int flags)
  490 {
  491         struct ieee80211_rateset *rs = &ni->ni_rates;
  492 
  493         memset(rs, 0, sizeof(*rs));
  494         rs->rs_nrates = rates[1];
  495         memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
  496         if (xrates != NULL) {
  497                 u_int8_t nxrates;
  498                 /*
  499                  * Tack on 11g extended supported rate element.
  500                  */
  501                 nxrates = xrates[1];
  502                 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
  503                         nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
  504                         IEEE80211_DPRINTF(("%s: extended rate set too large;"
  505                                 " only using %u of %u rates\n",
  506                                 __func__, nxrates, xrates[1]));
  507                         ic->ic_stats.is_rx_rstoobig++;
  508                 }
  509                 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
  510                 rs->rs_nrates += nxrates;
  511         }
  512         return ieee80211_fix_rate(ic, ni, flags);
  513 }
  514 
  515 /* Verify the existence and length of __elem or get out. */
  516 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do {                 \
  517         if ((__elem) == NULL) {                                         \
  518                 IEEE80211_DPRINTF(("%s: no " #__elem "in %s frame\n",   \
  519                         __func__, ieee80211_mgt_subtype_name[subtype >> \
  520                                 IEEE80211_FC0_SUBTYPE_SHIFT]));         \
  521                 ic->ic_stats.is_rx_elem_missing++;                      \
  522                 return;                                                 \
  523         }                                                               \
  524         if ((__elem)[1] > (__maxlen)) {                                 \
  525                 IEEE80211_DPRINTF(("%s: bad " #__elem " len %d in %s "  \
  526                         "frame from %s\n", __func__, (__elem)[1],       \
  527                         ieee80211_mgt_subtype_name[subtype >>           \
  528                                 IEEE80211_FC0_SUBTYPE_SHIFT],           \
  529                         ether_sprintf(wh->i_addr2)));                   \
  530                 ic->ic_stats.is_rx_elem_toobig++;                       \
  531                 return;                                                 \
  532         }                                                               \
  533 } while (0)
  534 
  535 #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do {                     \
  536         if ((_len) < (_minlen)) {                                       \
  537                 IEEE80211_DPRINTF(("%s: %s frame too short from %s\n",  \
  538                         __func__,                                       \
  539                         ieee80211_mgt_subtype_name[subtype >>           \
  540                                 IEEE80211_FC0_SUBTYPE_SHIFT],           \
  541                         ether_sprintf(wh->i_addr2)));                   \
  542                 ic->ic_stats.is_rx_elem_toosmall++;                     \
  543                 return;                                                 \
  544         }                                                               \
  545 } while (0)
  546 
  547 void
  548 ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0,
  549         struct ieee80211_node *ni,
  550         int subtype, int rssi, u_int32_t rstamp)
  551 {
  552 #define ISPROBE(_st)    ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP)
  553         struct ifnet *ifp = &ic->ic_if;
  554         struct ieee80211_frame *wh;
  555         u_int8_t *frm, *efrm;
  556         u_int8_t *ssid, *rates, *xrates;
  557         int reassoc, resp, newassoc, allocbs;
  558 
  559         wh = mtod(m0, struct ieee80211_frame *);
  560         frm = (u_int8_t *)&wh[1];
  561         efrm = mtod(m0, u_int8_t *) + m0->m_len;
  562         switch (subtype) {
  563         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  564         case IEEE80211_FC0_SUBTYPE_BEACON: {
  565                 u_int8_t *tstamp, *bintval, *capinfo, *country;
  566                 u_int8_t chan, bchan, fhindex, erp;
  567                 u_int16_t fhdwell;
  568 
  569                 if (ic->ic_opmode != IEEE80211_M_IBSS &&
  570                     ic->ic_state != IEEE80211_S_SCAN) {
  571                         /* XXX: may be useful for background scan */
  572                         return;
  573                 }
  574 
  575                 /*
  576                  * beacon/probe response frame format
  577                  *      [8] time stamp
  578                  *      [2] beacon interval
  579                  *      [2] capability information
  580                  *      [tlv] ssid
  581                  *      [tlv] supported rates
  582                  *      [tlv] country information
  583                  *      [tlv] parameter set (FH/DS)
  584                  *      [tlv] erp information
  585                  *      [tlv] extended supported rates
  586                  */
  587                 IEEE80211_VERIFY_LENGTH(efrm - frm, 12);
  588                 tstamp  = frm;  frm += 8;
  589                 bintval = frm;  frm += 2;
  590                 capinfo = frm;  frm += 2;
  591                 ssid = rates = xrates = country = NULL;
  592                 bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan);
  593                 chan = bchan;
  594                 fhdwell = 0;
  595                 fhindex = 0;
  596                 erp = 0;
  597                 while (frm < efrm) {
  598                         switch (*frm) {
  599                         case IEEE80211_ELEMID_SSID:
  600                                 ssid = frm;
  601                                 break;
  602                         case IEEE80211_ELEMID_RATES:
  603                                 rates = frm;
  604                                 break;
  605                         case IEEE80211_ELEMID_COUNTRY:
  606                                 country = frm;
  607                                 break;
  608                         case IEEE80211_ELEMID_FHPARMS:
  609                                 if (ic->ic_phytype == IEEE80211_T_FH) {
  610                                         fhdwell = (frm[3] << 8) | frm[2];
  611                                         chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
  612                                         fhindex = frm[6];
  613                                 }
  614                                 break;
  615                         case IEEE80211_ELEMID_DSPARMS:
  616                                 /*
  617                                  * XXX hack this since depending on phytype
  618                                  * is problematic for multi-mode devices.
  619                                  */
  620                                 if (ic->ic_phytype != IEEE80211_T_FH)
  621                                         chan = frm[2];
  622                                 break;
  623                         case IEEE80211_ELEMID_TIM:
  624                                 break;
  625                         case IEEE80211_ELEMID_XRATES:
  626                                 xrates = frm;
  627                                 break;
  628                         case IEEE80211_ELEMID_ERP:
  629                                 if (frm[1] != 1) {
  630                                         IEEE80211_DPRINTF(("%s: invalid ERP "
  631                                                 "element; length %u, expecting "
  632                                                 "1\n", __func__, frm[1]));
  633                                         ic->ic_stats.is_rx_elem_toobig++;
  634                                         break;
  635                                 }
  636                                 erp = frm[2];
  637                                 break;
  638                         default:
  639                                 IEEE80211_DPRINTF2(("%s: element id %u/len %u "
  640                                         "ignored\n", __func__, *frm, frm[1]));
  641                                 ic->ic_stats.is_rx_elem_unknown++;
  642                                 break;
  643                         }
  644                         frm += frm[1] + 2;
  645                 }
  646                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
  647                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
  648                 if (
  649 #if IEEE80211_CHAN_MAX < 255
  650                     chan > IEEE80211_CHAN_MAX ||
  651 #endif
  652                     isclr(ic->ic_chan_active, chan)) {
  653                         IEEE80211_DPRINTF(("%s: ignore %s with invalid channel "
  654                                 "%u\n", __func__,
  655                                 ISPROBE(subtype) ? "probe response" : "beacon",
  656                                 chan));
  657                         ic->ic_stats.is_rx_badchan++;
  658                         return;
  659                 }
  660                 if (chan != bchan) {
  661                         /*
  662                          * Frame was received on a channel different from the
  663                          * one indicated in the DS/FH params element id;
  664                          * silently discard it.
  665                          *
  666                          * NB: this can happen due to signal leakage.
  667                          */
  668                         IEEE80211_DPRINTF(("%s: ignore %s on channel %u marked "
  669                                 "for channel %u\n", __func__,
  670                                 ISPROBE(subtype) ? "probe response" : "beacon",
  671                                 bchan, chan));
  672                         ic->ic_stats.is_rx_chanmismatch++;
  673                         return;
  674                 }
  675 
  676                 /*
  677                  * Use mac and channel for lookup so we collect all
  678                  * potential AP's when scanning.  Otherwise we may
  679                  * see the same AP on multiple channels and will only
  680                  * record the last one.  We could filter APs here based
  681                  * on rssi, etc. but leave that to the end of the scan
  682                  * so we can keep the selection criteria in one spot.
  683                  * This may result in a bloat of the scanned AP list but
  684                  * it shouldn't be too much.
  685                  */
  686                 ni = ieee80211_lookup_node(ic, wh->i_addr2,
  687                                 &ic->ic_channels[chan]);
  688 #ifdef IEEE80211_DEBUG
  689                 if (ieee80211_debug &&
  690                     (ni == NULL || ic->ic_state == IEEE80211_S_SCAN)) {
  691                         printf("%s: %s%s on chan %u (bss chan %u) ",
  692                             __func__, (ni == NULL ? "new " : ""),
  693                             ISPROBE(subtype) ? "probe response" : "beacon",
  694                             chan, bchan);
  695                         ieee80211_print_essid(ssid + 2, ssid[1]);
  696                         printf(" from %s\n", ether_sprintf(wh->i_addr2));
  697                         printf("%s: caps 0x%x bintval %u erp 0x%x\n",
  698                                 __func__, le16toh(*(u_int16_t *)capinfo),
  699                                 le16toh(*(u_int16_t *)bintval), erp);
  700                         if (country)
  701                                 printf("%s: country info %*D\n",
  702                                         __func__, country[1], country+2, " ");
  703                 }
  704 #endif
  705                 if (ni == NULL) {
  706                         ni = ieee80211_alloc_node(ic, wh->i_addr2);
  707                         if (ni == NULL) {
  708                                 ic->ic_stats.is_rx_nodealloc++;
  709                                 return;
  710                         }
  711                         ni->ni_esslen = ssid[1];
  712                         memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
  713                         memcpy(ni->ni_essid, ssid + 2, ssid[1]);
  714                 } else if (ssid[1] != 0 && ISPROBE(subtype)) {
  715                         /*
  716                          * Update ESSID at probe response to adopt hidden AP by
  717                          * Lucent/Cisco, which announces null ESSID in beacon.
  718                          */
  719                         ni->ni_esslen = ssid[1];
  720                         memset(ni->ni_essid, 0, sizeof(ni->ni_essid));
  721                         memcpy(ni->ni_essid, ssid + 2, ssid[1]);
  722                 }
  723                 IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3);
  724                 ni->ni_rssi = rssi;
  725                 ni->ni_rstamp = rstamp;
  726                 memcpy(ni->ni_tstamp, tstamp, sizeof(ni->ni_tstamp));
  727                 ni->ni_intval = le16toh(*(u_int16_t *)bintval);
  728                 ni->ni_capinfo = le16toh(*(u_int16_t *)capinfo);
  729                 /* XXX validate channel # */
  730                 ni->ni_chan = &ic->ic_channels[chan];
  731                 ni->ni_fhdwell = fhdwell;
  732                 ni->ni_fhindex = fhindex;
  733                 ni->ni_erp = erp;
  734                 /* NB: must be after ni_chan is setup */
  735                 ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT);
  736                 ieee80211_unref_node(&ni);
  737                 break;
  738         }
  739 
  740         case IEEE80211_FC0_SUBTYPE_PROBE_REQ: {
  741                 u_int8_t rate;
  742 
  743                 if (ic->ic_opmode == IEEE80211_M_STA)
  744                         return;
  745                 if (ic->ic_state != IEEE80211_S_RUN)
  746                         return;
  747 
  748                 /*
  749                  * prreq frame format
  750                  *      [tlv] ssid
  751                  *      [tlv] supported rates
  752                  *      [tlv] extended supported rates
  753                  */
  754                 ssid = rates = xrates = NULL;
  755                 while (frm < efrm) {
  756                         switch (*frm) {
  757                         case IEEE80211_ELEMID_SSID:
  758                                 ssid = frm;
  759                                 break;
  760                         case IEEE80211_ELEMID_RATES:
  761                                 rates = frm;
  762                                 break;
  763                         case IEEE80211_ELEMID_XRATES:
  764                                 xrates = frm;
  765                                 break;
  766                         }
  767                         frm += frm[1] + 2;
  768                 }
  769                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
  770                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
  771                 if (ssid[1] != 0 &&
  772                     (ssid[1] != ic->ic_bss->ni_esslen ||
  773                     memcmp(ssid + 2, ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen) != 0)) {
  774 #ifdef IEEE80211_DEBUG
  775                         if (ieee80211_debug) {
  776                                 printf("%s: ssid unmatch ", __func__);
  777                                 ieee80211_print_essid(ssid + 2, ssid[1]);
  778                                 printf(" from %s\n", ether_sprintf(wh->i_addr2));
  779                         }
  780 #endif
  781                         ic->ic_stats.is_rx_ssidmismatch++;
  782                         return;
  783                 }
  784 
  785                 if (ni == ic->ic_bss) {
  786                         ni = ieee80211_dup_bss(ic, wh->i_addr2);
  787                         if (ni == NULL) {
  788                                 ic->ic_stats.is_rx_nodealloc++;
  789                                 return;
  790                         }
  791                         IEEE80211_DPRINTF(("%s: new req from %s\n",
  792                                 __func__, ether_sprintf(wh->i_addr2)));
  793                         allocbs = 1;
  794                 } else
  795                         allocbs = 0;
  796                 ni->ni_rssi = rssi;
  797                 ni->ni_rstamp = rstamp;
  798                 rate = ieee80211_setup_rates(ic, ni, rates, xrates,
  799                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE
  800                                 | IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
  801                 if (rate & IEEE80211_RATE_BASIC) {
  802                         IEEE80211_DPRINTF(("%s: rate negotiation failed: %s\n",
  803                                 __func__,ether_sprintf(wh->i_addr2)));
  804                 } else {
  805                         IEEE80211_SEND_MGMT(ic, ni,
  806                                 IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0);
  807                 }
  808                 if (allocbs) {
  809                         /* XXX just use free? */
  810                         if (ic->ic_opmode == IEEE80211_M_HOSTAP)
  811                                 ieee80211_free_node(ic, ni);
  812                         else
  813                                 ieee80211_unref_node(&ni);
  814                 }
  815                 break;
  816         }
  817 
  818         case IEEE80211_FC0_SUBTYPE_AUTH: {
  819                 u_int16_t algo, seq, status;
  820                 /*
  821                  * auth frame format
  822                  *      [2] algorithm
  823                  *      [2] sequence
  824                  *      [2] status
  825                  *      [tlv*] challenge
  826                  */
  827                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
  828                 algo   = le16toh(*(u_int16_t *)frm);
  829                 seq    = le16toh(*(u_int16_t *)(frm + 2));
  830                 status = le16toh(*(u_int16_t *)(frm + 4));
  831                 if (algo != IEEE80211_AUTH_ALG_OPEN) {
  832                         /* TODO: shared key auth */
  833                         IEEE80211_DPRINTF(("%s: unsupported auth %d from %s\n",
  834                                 __func__, algo, ether_sprintf(wh->i_addr2)));
  835                         ic->ic_stats.is_rx_auth_unsupported++;
  836                         return;
  837                 }
  838                 switch (ic->ic_opmode) {
  839                 case IEEE80211_M_IBSS:
  840                         if (ic->ic_state != IEEE80211_S_RUN || seq != 1) {
  841                                 IEEE80211_DPRINTF(("%s: discard auth from %s; "
  842                                         "state %u, seq %u\n", __func__,
  843                                         ether_sprintf(wh->i_addr2),
  844                                         ic->ic_state, seq));
  845                                 ic->ic_stats.is_rx_bad_auth++;
  846                                 break;
  847                         }
  848                         ieee80211_new_state(ic, IEEE80211_S_AUTH,
  849                             wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
  850                         break;
  851 
  852                 case IEEE80211_M_AHDEMO:
  853                         /* should not come here */
  854                         break;
  855 
  856                 case IEEE80211_M_HOSTAP:
  857                         if (ic->ic_state != IEEE80211_S_RUN || seq != 1) {
  858                                 IEEE80211_DPRINTF(("%s: discard auth from %s; "
  859                                         "state %u, seq %u\n", __func__,
  860                                         ether_sprintf(wh->i_addr2),
  861                                         ic->ic_state, seq));
  862                                 ic->ic_stats.is_rx_bad_auth++;
  863                                 break;
  864                         }
  865                         if (ni == ic->ic_bss) {
  866                                 ni = ieee80211_alloc_node(ic, wh->i_addr2);
  867                                 if (ni == NULL) {
  868                                         ic->ic_stats.is_rx_nodealloc++;
  869                                         return;
  870                                 }
  871                                 IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
  872                                 ni->ni_rssi = rssi;
  873                                 ni->ni_rstamp = rstamp;
  874                                 ni->ni_chan = ic->ic_bss->ni_chan;
  875                                 allocbs = 1;
  876                         } else
  877                                 allocbs = 0;
  878                         IEEE80211_SEND_MGMT(ic, ni,
  879                                 IEEE80211_FC0_SUBTYPE_AUTH, 2);
  880                         if (ifp->if_flags & IFF_DEBUG)
  881                                 if_printf(ifp, "station %s %s authenticated\n",
  882                                     (allocbs ? "newly" : "already"),
  883                                     ether_sprintf(ni->ni_macaddr));
  884                         break;
  885 
  886                 case IEEE80211_M_STA:
  887                         if (ic->ic_state != IEEE80211_S_AUTH || seq != 2) {
  888                                 IEEE80211_DPRINTF(("%s: discard auth from %s; "
  889                                         "state %u, seq %u\n", __func__,
  890                                         ether_sprintf(wh->i_addr2),
  891                                         ic->ic_state, seq));
  892                                 ic->ic_stats.is_rx_bad_auth++;
  893                                 break;
  894                         }
  895                         if (status != 0) {
  896                                 if_printf(&ic->ic_if,
  897                                     "authentication failed (reason %d) for %s\n",
  898                                     status,
  899                                     ether_sprintf(wh->i_addr3));
  900                                 if (ni != ic->ic_bss)
  901                                         ni->ni_fails++;
  902                                 ic->ic_stats.is_rx_auth_fail++;
  903                                 return;
  904                         }
  905                         ieee80211_new_state(ic, IEEE80211_S_ASSOC,
  906                             wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
  907                         break;
  908                 case IEEE80211_M_MONITOR:
  909                         break;
  910                 }
  911                 break;
  912         }
  913 
  914         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
  915         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: {
  916                 u_int16_t capinfo, bintval;
  917 
  918                 if (ic->ic_opmode != IEEE80211_M_HOSTAP ||
  919                     (ic->ic_state != IEEE80211_S_RUN))
  920                         return;
  921 
  922                 if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
  923                         reassoc = 1;
  924                         resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP;
  925                 } else {
  926                         reassoc = 0;
  927                         resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP;
  928                 }
  929                 /*
  930                  * asreq frame format
  931                  *      [2] capability information
  932                  *      [2] listen interval
  933                  *      [6*] current AP address (reassoc only)
  934                  *      [tlv] ssid
  935                  *      [tlv] supported rates
  936                  *      [tlv] extended supported rates
  937                  */
  938                 IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4));
  939                 if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) {
  940                         IEEE80211_DPRINTF(("%s: ignore other bss from %s\n",
  941                                 __func__, ether_sprintf(wh->i_addr2)));
  942                         ic->ic_stats.is_rx_assoc_bss++;
  943                         return;
  944                 }
  945                 capinfo = le16toh(*(u_int16_t *)frm);   frm += 2;
  946                 bintval = le16toh(*(u_int16_t *)frm);   frm += 2;
  947                 if (reassoc)
  948                         frm += 6;       /* ignore current AP info */
  949                 ssid = rates = xrates = NULL;
  950                 while (frm < efrm) {
  951                         switch (*frm) {
  952                         case IEEE80211_ELEMID_SSID:
  953                                 ssid = frm;
  954                                 break;
  955                         case IEEE80211_ELEMID_RATES:
  956                                 rates = frm;
  957                                 break;
  958                         case IEEE80211_ELEMID_XRATES:
  959                                 xrates = frm;
  960                                 break;
  961                         }
  962                         frm += frm[1] + 2;
  963                 }
  964                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
  965                 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN);
  966                 if (ssid[1] != ic->ic_bss->ni_esslen ||
  967                     memcmp(ssid + 2, ic->ic_bss->ni_essid, ssid[1]) != 0) {
  968 #ifdef IEEE80211_DEBUG
  969                         if (ieee80211_debug) {
  970                                 printf("%s: ssid unmatch ", __func__);
  971                                 ieee80211_print_essid(ssid + 2, ssid[1]);
  972                                 printf(" from %s\n", ether_sprintf(wh->i_addr2));
  973                         }
  974 #endif
  975                         ic->ic_stats.is_rx_ssidmismatch++;
  976                         return;
  977                 }
  978                 if (ni == ic->ic_bss) {
  979                         IEEE80211_DPRINTF(("%s: not authenticated for %s\n",
  980                                 __func__, ether_sprintf(wh->i_addr2)));
  981                         ni = ieee80211_dup_bss(ic, wh->i_addr2);
  982                         if (ni != NULL) {
  983                                 IEEE80211_SEND_MGMT(ic, ni,
  984                                     IEEE80211_FC0_SUBTYPE_DEAUTH,
  985                                     IEEE80211_REASON_ASSOC_NOT_AUTHED);
  986                                 ieee80211_free_node(ic, ni);
  987                         }
  988                         ic->ic_stats.is_rx_assoc_notauth++;
  989                         return;
  990                 }
  991                 /* XXX per-node cipher suite */
  992                 /* XXX some stations use the privacy bit for handling APs
  993                        that suport both encrypted and unencrypted traffic */
  994                 if ((capinfo & IEEE80211_CAPINFO_ESS) == 0 ||
  995                     (capinfo & IEEE80211_CAPINFO_PRIVACY) !=
  996                     ((ic->ic_flags & IEEE80211_F_WEPON) ?
  997                      IEEE80211_CAPINFO_PRIVACY : 0)) {
  998                         IEEE80211_DPRINTF(("%s: capability mismatch %x for %s\n",
  999                                 __func__, capinfo, ether_sprintf(wh->i_addr2)));
 1000                         ni->ni_associd = 0;
 1001                         IEEE80211_SEND_MGMT(ic, ni, resp,
 1002                                 IEEE80211_STATUS_CAPINFO);
 1003                         ic->ic_stats.is_rx_assoc_capmismatch++;
 1004                         return;
 1005                 }
 1006                 ieee80211_setup_rates(ic, ni, rates, xrates,
 1007                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1008                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1009                 if (ni->ni_rates.rs_nrates == 0) {
 1010                         IEEE80211_DPRINTF(("%s: rate unmatch for %s\n",
 1011                                 __func__, ether_sprintf(wh->i_addr2)));
 1012                         ni->ni_associd = 0;
 1013                         IEEE80211_SEND_MGMT(ic, ni, resp,
 1014                                 IEEE80211_STATUS_BASIC_RATE);
 1015                         ic->ic_stats.is_rx_assoc_norate++;
 1016                         return;
 1017                 }
 1018                 ni->ni_rssi = rssi;
 1019                 ni->ni_rstamp = rstamp;
 1020                 ni->ni_intval = bintval;
 1021                 ni->ni_capinfo = capinfo;
 1022                 ni->ni_chan = ic->ic_bss->ni_chan;
 1023                 ni->ni_fhdwell = ic->ic_bss->ni_fhdwell;
 1024                 ni->ni_fhindex = ic->ic_bss->ni_fhindex;
 1025                 if (ni->ni_associd == 0) {
 1026                         /* XXX handle rollover at 2007 */
 1027                         /* XXX guarantee uniqueness */
 1028                         ni->ni_associd = 0xc000 | ic->ic_bss->ni_associd++;
 1029                         newassoc = 1;
 1030                 } else
 1031                         newassoc = 0;
 1032                 /* XXX for 11g must turn off short slot time if long
 1033                    slot time sta associates */
 1034                 IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
 1035                 if (ifp->if_flags & IFF_DEBUG)
 1036                         if_printf(ifp, "station %s %s associated\n",
 1037                             (newassoc ? "newly" : "already"),
 1038                             ether_sprintf(ni->ni_macaddr));
 1039                 /* give driver a chance to setup state like ni_txrate */
 1040                 if (ic->ic_newassoc)
 1041                         (*ic->ic_newassoc)(ic, ni, newassoc);
 1042                 break;
 1043         }
 1044 
 1045         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 1046         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: {
 1047                 u_int16_t status;
 1048 
 1049                 if (ic->ic_opmode != IEEE80211_M_STA ||
 1050                     ic->ic_state != IEEE80211_S_ASSOC)
 1051                         return;
 1052 
 1053                 /*
 1054                  * asresp frame format
 1055                  *      [2] capability information
 1056                  *      [2] status
 1057                  *      [2] association ID
 1058                  *      [tlv] supported rates
 1059                  *      [tlv] extended supported rates
 1060                  */
 1061                 IEEE80211_VERIFY_LENGTH(efrm - frm, 6);
 1062                 ni = ic->ic_bss;
 1063                 ni->ni_capinfo = le16toh(*(u_int16_t *)frm);
 1064                 frm += 2;
 1065 
 1066                 status = le16toh(*(u_int16_t *)frm);
 1067                 frm += 2;
 1068                 if (status != 0) {
 1069                         if_printf(ifp, "association failed (reason %d) for %s\n",
 1070                             status, ether_sprintf(wh->i_addr3));
 1071                         if (ni != ic->ic_bss)
 1072                                 ni->ni_fails++;
 1073                         ic->ic_stats.is_rx_auth_fail++;
 1074                         return;
 1075                 }
 1076                 ni->ni_associd = le16toh(*(u_int16_t *)frm);
 1077                 frm += 2;
 1078 
 1079                 rates = xrates = NULL;
 1080                 while (frm < efrm) {
 1081                         switch (*frm) {
 1082                         case IEEE80211_ELEMID_RATES:
 1083                                 rates = frm;
 1084                                 break;
 1085                         case IEEE80211_ELEMID_XRATES:
 1086                                 xrates = frm;
 1087                                 break;
 1088                         }
 1089                         frm += frm[1] + 2;
 1090                 }
 1091 
 1092                 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE);
 1093                 ieee80211_setup_rates(ic, ni, rates, xrates,
 1094                                 IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE |
 1095                                 IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
 1096                 if (ni->ni_rates.rs_nrates != 0)
 1097                         ieee80211_new_state(ic, IEEE80211_S_RUN,
 1098                                 wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
 1099                 break;
 1100         }
 1101 
 1102         case IEEE80211_FC0_SUBTYPE_DEAUTH: {
 1103                 u_int16_t reason;
 1104                 /*
 1105                  * deauth frame format
 1106                  *      [2] reason
 1107                  */
 1108                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2);
 1109                 reason = le16toh(*(u_int16_t *)frm);
 1110                 ic->ic_stats.is_rx_deauth++;
 1111                 switch (ic->ic_opmode) {
 1112                 case IEEE80211_M_STA:
 1113                         ieee80211_new_state(ic, IEEE80211_S_AUTH,
 1114                             wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
 1115                         break;
 1116                 case IEEE80211_M_HOSTAP:
 1117                         if (ni != ic->ic_bss) {
 1118                                 if (ifp->if_flags & IFF_DEBUG)
 1119                                         if_printf(ifp, "station %s deauthenticated"
 1120                                             " by peer (reason %d)\n",
 1121                                             ether_sprintf(ni->ni_macaddr), reason);
 1122                                 /* node will be free'd on return */
 1123                                 ieee80211_unref_node(&ni);
 1124                         }
 1125                         break;
 1126                 default:
 1127                         break;
 1128                 }
 1129                 break;
 1130         }
 1131 
 1132         case IEEE80211_FC0_SUBTYPE_DISASSOC: {
 1133                 u_int16_t reason;
 1134                 /*
 1135                  * disassoc frame format
 1136                  *      [2] reason
 1137                  */
 1138                 IEEE80211_VERIFY_LENGTH(efrm - frm, 2);
 1139                 reason = le16toh(*(u_int16_t *)frm);
 1140                 ic->ic_stats.is_rx_disassoc++;
 1141                 switch (ic->ic_opmode) {
 1142                 case IEEE80211_M_STA:
 1143                         ieee80211_new_state(ic, IEEE80211_S_ASSOC,
 1144                             wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK);
 1145                         break;
 1146                 case IEEE80211_M_HOSTAP:
 1147                         if (ni != ic->ic_bss) {
 1148                                 if (ifp->if_flags & IFF_DEBUG)
 1149                                         if_printf(ifp, "station %s disassociated"
 1150                                             " by peer (reason %d)\n",
 1151                                             ether_sprintf(ni->ni_macaddr), reason);
 1152                                 ni->ni_associd = 0;
 1153                                 /* XXX node reclaimed how? */
 1154                         }
 1155                         break;
 1156                 default:
 1157                         break;
 1158                 }
 1159                 break;
 1160         }
 1161         default:
 1162                 IEEE80211_DPRINTF(("%s: mgmt frame with subtype 0x%x not "
 1163                         "handled\n", __func__, subtype));
 1164                 ic->ic_stats.is_rx_badsubtype++;
 1165                 break;
 1166         }
 1167 #undef ISPROBE
 1168 }
 1169 #undef IEEE80211_VERIFY_LENGTH
 1170 #undef IEEE80211_VERIFY_ELEMENT

Cache object: 1574eeed886712fd5271a8c5f866a80b


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