The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_output.c

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/8.2/sys/net80211/ieee80211_output.c 199583 2009-11-20 15:27:52Z jhb $");
   29 
   30 #include "opt_inet.h"
   31 #include "opt_inet6.h"
   32 #include "opt_wlan.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h> 
   36 #include <sys/mbuf.h>   
   37 #include <sys/kernel.h>
   38 #include <sys/endian.h>
   39 
   40 #include <sys/socket.h>
   41  
   42 #include <net/bpf.h>
   43 #include <net/ethernet.h>
   44 #include <net/if.h>
   45 #include <net/if_llc.h>
   46 #include <net/if_media.h>
   47 #include <net/if_vlan_var.h>
   48 
   49 #include <net80211/ieee80211_var.h>
   50 #include <net80211/ieee80211_regdomain.h>
   51 #ifdef IEEE80211_SUPPORT_SUPERG
   52 #include <net80211/ieee80211_superg.h>
   53 #endif
   54 #ifdef IEEE80211_SUPPORT_TDMA
   55 #include <net80211/ieee80211_tdma.h>
   56 #endif
   57 #include <net80211/ieee80211_wds.h>
   58 #include <net80211/ieee80211_mesh.h>
   59 
   60 #ifdef INET
   61 #include <netinet/in.h> 
   62 #include <netinet/if_ether.h>
   63 #include <netinet/in_systm.h>
   64 #include <netinet/ip.h>
   65 #endif
   66 #ifdef INET6
   67 #include <netinet/ip6.h>
   68 #endif
   69 
   70 #include <security/mac/mac_framework.h>
   71 
   72 #define ETHER_HEADER_COPY(dst, src) \
   73         memcpy(dst, src, sizeof(struct ether_header))
   74 
   75 /* unalligned little endian access */     
   76 #define LE_WRITE_2(p, v) do {                           \
   77         ((uint8_t *)(p))[0] = (v) & 0xff;               \
   78         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
   79 } while (0)
   80 #define LE_WRITE_4(p, v) do {                           \
   81         ((uint8_t *)(p))[0] = (v) & 0xff;               \
   82         ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff;        \
   83         ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff;       \
   84         ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff;       \
   85 } while (0)
   86 
   87 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *,
   88         u_int hdrsize, u_int ciphdrsize, u_int mtu);
   89 static  void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int);
   90 
   91 #ifdef IEEE80211_DEBUG
   92 /*
   93  * Decide if an outbound management frame should be
   94  * printed when debugging is enabled.  This filters some
   95  * of the less interesting frames that come frequently
   96  * (e.g. beacons).
   97  */
   98 static __inline int
   99 doprint(struct ieee80211vap *vap, int subtype)
  100 {
  101         switch (subtype) {
  102         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
  103                 return (vap->iv_opmode == IEEE80211_M_IBSS);
  104         }
  105         return 1;
  106 }
  107 #endif
  108 
  109 /*
  110  * Start method for vap's.  All packets from the stack come
  111  * through here.  We handle common processing of the packets
  112  * before dispatching them to the underlying device.
  113  */
  114 void
  115 ieee80211_start(struct ifnet *ifp)
  116 {
  117 #define IS_DWDS(vap) \
  118         (vap->iv_opmode == IEEE80211_M_WDS && \
  119          (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0)
  120         struct ieee80211vap *vap = ifp->if_softc;
  121         struct ieee80211com *ic = vap->iv_ic;
  122         struct ifnet *parent = ic->ic_ifp;
  123         struct ieee80211_node *ni;
  124         struct mbuf *m;
  125         struct ether_header *eh;
  126         int error;
  127 
  128         /* NB: parent must be up and running */
  129         if (!IFNET_IS_UP_RUNNING(parent)) {
  130                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  131                     "%s: ignore queue, parent %s not up+running\n",
  132                     __func__, parent->if_xname);
  133                 /* XXX stat */
  134                 return;
  135         }
  136         if (vap->iv_state == IEEE80211_S_SLEEP) {
  137                 /*
  138                  * In power save, wakeup device for transmit.
  139                  */
  140                 ieee80211_new_state(vap, IEEE80211_S_RUN, 0);
  141                 return;
  142         }
  143         /*
  144          * No data frames go out unless we're running.
  145          * Note in particular this covers CAC and CSA
  146          * states (though maybe we should check muting
  147          * for CSA).
  148          */
  149         if (vap->iv_state != IEEE80211_S_RUN) {
  150                 IEEE80211_LOCK(ic);
  151                 /* re-check under the com lock to avoid races */
  152                 if (vap->iv_state != IEEE80211_S_RUN) {
  153                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  154                             "%s: ignore queue, in %s state\n",
  155                             __func__, ieee80211_state_name[vap->iv_state]);
  156                         vap->iv_stats.is_tx_badstate++;
  157                         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  158                         IEEE80211_UNLOCK(ic);
  159                         return;
  160                 }
  161                 IEEE80211_UNLOCK(ic);
  162         }
  163         for (;;) {
  164                 IFQ_DEQUEUE(&ifp->if_snd, m);
  165                 if (m == NULL)
  166                         break;
  167                 /*
  168                  * Sanitize mbuf flags for net80211 use.  We cannot
  169                  * clear M_PWR_SAV or M_MORE_DATA because these may
  170                  * be set for frames that are re-submitted from the
  171                  * power save queue.
  172                  *
  173                  * NB: This must be done before ieee80211_classify as
  174                  *     it marks EAPOL in frames with M_EAPOL.
  175                  */
  176                 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA);
  177                 /*
  178                  * Cancel any background scan.
  179                  */
  180                 if (ic->ic_flags & IEEE80211_F_SCAN)
  181                         ieee80211_cancel_anyscan(vap);
  182                 /* 
  183                  * Find the node for the destination so we can do
  184                  * things like power save and fast frames aggregation.
  185                  *
  186                  * NB: past this point various code assumes the first
  187                  *     mbuf has the 802.3 header present (and contiguous).
  188                  */
  189                 ni = NULL;
  190                 if (m->m_len < sizeof(struct ether_header) &&
  191                    (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
  192                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  193                             "discard frame, %s\n", "m_pullup failed");
  194                         vap->iv_stats.is_tx_nobuf++;    /* XXX */
  195                         ifp->if_oerrors++;
  196                         continue;
  197                 }
  198                 eh = mtod(m, struct ether_header *);
  199                 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  200                         if (IS_DWDS(vap)) {
  201                                 /*
  202                                  * Only unicast frames from the above go out
  203                                  * DWDS vaps; multicast frames are handled by
  204                                  * dispatching the frame as it comes through
  205                                  * the AP vap (see below).
  206                                  */
  207                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS,
  208                                     eh->ether_dhost, "mcast", "%s", "on DWDS");
  209                                 vap->iv_stats.is_dwds_mcast++;
  210                                 m_freem(m);
  211                                 continue;
  212                         }
  213                         if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
  214                                 /*
  215                                  * Spam DWDS vap's w/ multicast traffic.
  216                                  */
  217                                 /* XXX only if dwds in use? */
  218                                 ieee80211_dwds_mcast(vap, m);
  219                         }
  220                 }
  221 #ifdef IEEE80211_SUPPORT_MESH
  222                 if (vap->iv_opmode != IEEE80211_M_MBSS) {
  223 #endif
  224                         ni = ieee80211_find_txnode(vap, eh->ether_dhost);
  225                         if (ni == NULL) {
  226                                 /* NB: ieee80211_find_txnode does stat+msg */
  227                                 ifp->if_oerrors++;
  228                                 m_freem(m);
  229                                 continue;
  230                         }
  231                         if (ni->ni_associd == 0 &&
  232                             (ni->ni_flags & IEEE80211_NODE_ASSOCID)) {
  233                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
  234                                     eh->ether_dhost, NULL,
  235                                     "sta not associated (type 0x%04x)",
  236                                     htons(eh->ether_type));
  237                                 vap->iv_stats.is_tx_notassoc++;
  238                                 ifp->if_oerrors++;
  239                                 m_freem(m);
  240                                 ieee80211_free_node(ni);
  241                                 continue;
  242                         }
  243 #ifdef IEEE80211_SUPPORT_MESH
  244                 } else {
  245                         if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) {
  246                                 /*
  247                                  * Proxy station only if configured.
  248                                  */
  249                                 if (!ieee80211_mesh_isproxyena(vap)) {
  250                                         IEEE80211_DISCARD_MAC(vap,
  251                                             IEEE80211_MSG_OUTPUT |
  252                                                 IEEE80211_MSG_MESH,
  253                                             eh->ether_dhost, NULL,
  254                                             "%s", "proxy not enabled");
  255                                         vap->iv_stats.is_mesh_notproxy++;
  256                                         ifp->if_oerrors++;
  257                                         m_freem(m);
  258                                         continue;
  259                                 }
  260                                 ieee80211_mesh_proxy_check(vap, eh->ether_shost);
  261                         }
  262                         ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m);
  263                         if (ni == NULL) {
  264                                 /*
  265                                  * NB: ieee80211_mesh_discover holds/disposes
  266                                  * frame (e.g. queueing on path discovery).
  267                                  */
  268                                 ifp->if_oerrors++;
  269                                 continue;
  270                         }
  271                 }
  272 #endif
  273                 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
  274                     (m->m_flags & M_PWR_SAV) == 0) {
  275                         /*
  276                          * Station in power save mode; pass the frame
  277                          * to the 802.11 layer and continue.  We'll get
  278                          * the frame back when the time is right.
  279                          * XXX lose WDS vap linkage?
  280                          */
  281                         (void) ieee80211_pwrsave(ni, m);
  282                         ieee80211_free_node(ni);
  283                         continue;
  284                 }
  285                 /* calculate priority so drivers can find the tx queue */
  286                 if (ieee80211_classify(ni, m)) {
  287                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
  288                             eh->ether_dhost, NULL,
  289                             "%s", "classification failure");
  290                         vap->iv_stats.is_tx_classify++;
  291                         ifp->if_oerrors++;
  292                         m_freem(m);
  293                         ieee80211_free_node(ni);
  294                         continue;
  295                 }
  296                 /*
  297                  * Stash the node pointer.  Note that we do this after
  298                  * any call to ieee80211_dwds_mcast because that code
  299                  * uses any existing value for rcvif to identify the
  300                  * interface it (might have been) received on.
  301                  */
  302                 m->m_pkthdr.rcvif = (void *)ni;
  303 
  304                 BPF_MTAP(ifp, m);               /* 802.3 tx */
  305  
  306                 /*
  307                  * Check if A-MPDU tx aggregation is setup or if we
  308                  * should try to enable it.  The sta must be associated
  309                  * with HT and A-MPDU enabled for use.  When the policy
  310                  * routine decides we should enable A-MPDU we issue an
  311                  * ADDBA request and wait for a reply.  The frame being
  312                  * encapsulated will go out w/o using A-MPDU, or possibly
  313                  * it might be collected by the driver and held/retransmit.
  314                  * The default ic_ampdu_enable routine handles staggering
  315                  * ADDBA requests in case the receiver NAK's us or we are
  316                  * otherwise unable to establish a BA stream.
  317                  */
  318                 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) &&
  319                     (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) &&
  320                     (m->m_flags & M_EAPOL) == 0) {
  321                         const int ac = M_WME_GETAC(m);
  322                         struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac];
  323 
  324                         ieee80211_txampdu_count_packet(tap);
  325                         if (IEEE80211_AMPDU_RUNNING(tap)) {
  326                                 /*
  327                                  * Operational, mark frame for aggregation.
  328                                  *
  329                                  * XXX do tx aggregation here
  330                                  */
  331                                 m->m_flags |= M_AMPDU_MPDU;
  332                         } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
  333                             ic->ic_ampdu_enable(ni, tap)) {
  334                                 /*
  335                                  * Not negotiated yet, request service.
  336                                  */
  337                                 ieee80211_ampdu_request(ni, tap);
  338                                 /* XXX hold frame for reply? */
  339                         }
  340                 }
  341 #ifdef IEEE80211_SUPPORT_SUPERG
  342                 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) {
  343                         m = ieee80211_ff_check(ni, m);
  344                         if (m == NULL) {
  345                                 /* NB: any ni ref held on stageq */
  346                                 continue;
  347                         }
  348                 }
  349 #endif /* IEEE80211_SUPPORT_SUPERG */
  350                 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
  351                         /*
  352                          * Encapsulate the packet in prep for transmission.
  353                          */
  354                         m = ieee80211_encap(vap, ni, m);
  355                         if (m == NULL) {
  356                                 /* NB: stat+msg handled in ieee80211_encap */
  357                                 ieee80211_free_node(ni);
  358                                 continue;
  359                         }
  360                 }
  361 
  362                 error = parent->if_transmit(parent, m);
  363                 if (error != 0) {
  364                         /* NB: IFQ_HANDOFF reclaims mbuf */
  365                         ieee80211_free_node(ni);
  366                 } else {
  367                         ifp->if_opackets++;
  368                 }
  369                 ic->ic_lastdata = ticks;
  370         }
  371 #undef IS_DWDS
  372 }
  373 
  374 /*
  375  * 802.11 output routine. This is (currently) used only to
  376  * connect bpf write calls to the 802.11 layer for injecting
  377  * raw 802.11 frames.
  378  */
  379 int
  380 ieee80211_output(struct ifnet *ifp, struct mbuf *m,
  381         struct sockaddr *dst, struct route *ro)
  382 {
  383 #define senderr(e) do { error = (e); goto bad;} while (0)
  384         struct ieee80211_node *ni = NULL;
  385         struct ieee80211vap *vap;
  386         struct ieee80211_frame *wh;
  387         int error;
  388 
  389         if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
  390                 /*
  391                  * Short-circuit requests if the vap is marked OACTIVE
  392                  * as this can happen because a packet came down through
  393                  * ieee80211_start before the vap entered RUN state in
  394                  * which case it's ok to just drop the frame.  This
  395                  * should not be necessary but callers of if_output don't
  396                  * check OACTIVE.
  397                  */
  398                 senderr(ENETDOWN);
  399         }
  400         vap = ifp->if_softc;
  401         /*
  402          * Hand to the 802.3 code if not tagged as
  403          * a raw 802.11 frame.
  404          */
  405         if (dst->sa_family != AF_IEEE80211)
  406                 return vap->iv_output(ifp, m, dst, ro);
  407 #ifdef MAC
  408         error = mac_ifnet_check_transmit(ifp, m);
  409         if (error)
  410                 senderr(error);
  411 #endif
  412         if (ifp->if_flags & IFF_MONITOR)
  413                 senderr(ENETDOWN);
  414         if (!IFNET_IS_UP_RUNNING(ifp))
  415                 senderr(ENETDOWN);
  416         if (vap->iv_state == IEEE80211_S_CAC) {
  417                 IEEE80211_DPRINTF(vap,
  418                     IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
  419                     "block %s frame in CAC state\n", "raw data");
  420                 vap->iv_stats.is_tx_badstate++;
  421                 senderr(EIO);           /* XXX */
  422         }
  423         /* XXX bypass bridge, pfil, carp, etc. */
  424 
  425         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
  426                 senderr(EIO);   /* XXX */
  427         wh = mtod(m, struct ieee80211_frame *);
  428         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  429             IEEE80211_FC0_VERSION_0)
  430                 senderr(EIO);   /* XXX */
  431 
  432         /* locate destination node */
  433         switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
  434         case IEEE80211_FC1_DIR_NODS:
  435         case IEEE80211_FC1_DIR_FROMDS:
  436                 ni = ieee80211_find_txnode(vap, wh->i_addr1);
  437                 break;
  438         case IEEE80211_FC1_DIR_TODS:
  439         case IEEE80211_FC1_DIR_DSTODS:
  440                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame))
  441                         senderr(EIO);   /* XXX */
  442                 ni = ieee80211_find_txnode(vap, wh->i_addr3);
  443                 break;
  444         default:
  445                 senderr(EIO);   /* XXX */
  446         }
  447         if (ni == NULL) {
  448                 /*
  449                  * Permit packets w/ bpf params through regardless
  450                  * (see below about sa_len).
  451                  */
  452                 if (dst->sa_len == 0)
  453                         senderr(EHOSTUNREACH);
  454                 ni = ieee80211_ref_node(vap->iv_bss);
  455         }
  456 
  457         /*
  458          * Sanitize mbuf for net80211 flags leaked from above.
  459          *
  460          * NB: This must be done before ieee80211_classify as
  461          *     it marks EAPOL in frames with M_EAPOL.
  462          */
  463         m->m_flags &= ~M_80211_TX;
  464 
  465         /* calculate priority so drivers can find the tx queue */
  466         /* XXX assumes an 802.3 frame */
  467         if (ieee80211_classify(ni, m))
  468                 senderr(EIO);           /* XXX */
  469 
  470         ifp->if_opackets++;
  471         IEEE80211_NODE_STAT(ni, tx_data);
  472         if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  473                 IEEE80211_NODE_STAT(ni, tx_mcast);
  474                 m->m_flags |= M_MCAST;
  475         } else
  476                 IEEE80211_NODE_STAT(ni, tx_ucast);
  477         /* NB: ieee80211_encap does not include 802.11 header */
  478         IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
  479 
  480         /*
  481          * NB: DLT_IEEE802_11_RADIO identifies the parameters are
  482          * present by setting the sa_len field of the sockaddr (yes,
  483          * this is a hack).
  484          * NB: we assume sa_data is suitably aligned to cast.
  485          */
  486         return vap->iv_ic->ic_raw_xmit(ni, m,
  487             (const struct ieee80211_bpf_params *)(dst->sa_len ?
  488                 dst->sa_data : NULL));
  489 bad:
  490         if (m != NULL)
  491                 m_freem(m);
  492         if (ni != NULL)
  493                 ieee80211_free_node(ni);
  494         ifp->if_oerrors++;
  495         return error;
  496 #undef senderr
  497 }
  498 
  499 /*
  500  * Set the direction field and address fields of an outgoing
  501  * frame.  Note this should be called early on in constructing
  502  * a frame as it sets i_fc[1]; other bits can then be or'd in.
  503  */
  504 void
  505 ieee80211_send_setup(
  506         struct ieee80211_node *ni,
  507         struct mbuf *m,
  508         int type, int tid,
  509         const uint8_t sa[IEEE80211_ADDR_LEN],
  510         const uint8_t da[IEEE80211_ADDR_LEN],
  511         const uint8_t bssid[IEEE80211_ADDR_LEN])
  512 {
  513 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
  514         struct ieee80211vap *vap = ni->ni_vap;
  515         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  516         ieee80211_seq seqno;
  517 
  518         wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
  519         if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
  520                 switch (vap->iv_opmode) {
  521                 case IEEE80211_M_STA:
  522                         wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
  523                         IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
  524                         IEEE80211_ADDR_COPY(wh->i_addr2, sa);
  525                         IEEE80211_ADDR_COPY(wh->i_addr3, da);
  526                         break;
  527                 case IEEE80211_M_IBSS:
  528                 case IEEE80211_M_AHDEMO:
  529                         wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
  530                         IEEE80211_ADDR_COPY(wh->i_addr1, da);
  531                         IEEE80211_ADDR_COPY(wh->i_addr2, sa);
  532                         IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
  533                         break;
  534                 case IEEE80211_M_HOSTAP:
  535                         wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
  536                         IEEE80211_ADDR_COPY(wh->i_addr1, da);
  537                         IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
  538                         IEEE80211_ADDR_COPY(wh->i_addr3, sa);
  539                         break;
  540                 case IEEE80211_M_WDS:
  541                         wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
  542                         IEEE80211_ADDR_COPY(wh->i_addr1, da);
  543                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
  544                         IEEE80211_ADDR_COPY(wh->i_addr3, da);
  545                         IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
  546                         break;
  547                 case IEEE80211_M_MBSS:
  548 #ifdef IEEE80211_SUPPORT_MESH
  549                         /* XXX add support for proxied addresses */
  550                         if (IEEE80211_IS_MULTICAST(da)) {
  551                                 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
  552                                 /* XXX next hop */
  553                                 IEEE80211_ADDR_COPY(wh->i_addr1, da);
  554                                 IEEE80211_ADDR_COPY(wh->i_addr2,
  555                                     vap->iv_myaddr);
  556                         } else {
  557                                 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
  558                                 IEEE80211_ADDR_COPY(wh->i_addr1, da);
  559                                 IEEE80211_ADDR_COPY(wh->i_addr2,
  560                                     vap->iv_myaddr);
  561                                 IEEE80211_ADDR_COPY(wh->i_addr3, da);
  562                                 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
  563                         }
  564 #endif
  565                         break;
  566                 case IEEE80211_M_MONITOR:       /* NB: to quiet compiler */
  567                         break;
  568                 }
  569         } else {
  570                 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
  571                 IEEE80211_ADDR_COPY(wh->i_addr1, da);
  572                 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
  573 #ifdef IEEE80211_SUPPORT_MESH
  574                 if (vap->iv_opmode == IEEE80211_M_MBSS)
  575                         IEEE80211_ADDR_COPY(wh->i_addr3, sa);
  576                 else
  577 #endif
  578                         IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
  579         }
  580         *(uint16_t *)&wh->i_dur[0] = 0;
  581 
  582         seqno = ni->ni_txseqs[tid]++;
  583         *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
  584         M_SEQNO_SET(m, seqno);
  585 
  586         if (IEEE80211_IS_MULTICAST(wh->i_addr1))
  587                 m->m_flags |= M_MCAST;
  588 #undef WH4
  589 }
  590 
  591 /*
  592  * Send a management frame to the specified node.  The node pointer
  593  * must have a reference as the pointer will be passed to the driver
  594  * and potentially held for a long time.  If the frame is successfully
  595  * dispatched to the driver, then it is responsible for freeing the
  596  * reference (and potentially free'ing up any associated storage);
  597  * otherwise deal with reclaiming any reference (on error).
  598  */
  599 int
  600 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
  601         struct ieee80211_bpf_params *params)
  602 {
  603         struct ieee80211vap *vap = ni->ni_vap;
  604         struct ieee80211com *ic = ni->ni_ic;
  605         struct ieee80211_frame *wh;
  606 
  607         KASSERT(ni != NULL, ("null node"));
  608 
  609         if (vap->iv_state == IEEE80211_S_CAC) {
  610                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
  611                     ni, "block %s frame in CAC state",
  612                         ieee80211_mgt_subtype_name[
  613                             (type & IEEE80211_FC0_SUBTYPE_MASK) >>
  614                                 IEEE80211_FC0_SUBTYPE_SHIFT]);
  615                 vap->iv_stats.is_tx_badstate++;
  616                 ieee80211_free_node(ni);
  617                 m_freem(m);
  618                 return EIO;             /* XXX */
  619         }
  620 
  621         M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
  622         if (m == NULL) {
  623                 ieee80211_free_node(ni);
  624                 return ENOMEM;
  625         }
  626 
  627         wh = mtod(m, struct ieee80211_frame *);
  628         ieee80211_send_setup(ni, m,
  629              IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
  630              vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
  631         if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
  632                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
  633                     "encrypting frame (%s)", __func__);
  634                 wh->i_fc[1] |= IEEE80211_FC1_WEP;
  635         }
  636         m->m_flags |= M_ENCAP;          /* mark encapsulated */
  637 
  638         KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
  639         M_WME_SETAC(m, params->ibp_pri);
  640 
  641 #ifdef IEEE80211_DEBUG
  642         /* avoid printing too many frames */
  643         if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
  644             ieee80211_msg_dumppkts(vap)) {
  645                 printf("[%s] send %s on channel %u\n",
  646                     ether_sprintf(wh->i_addr1),
  647                     ieee80211_mgt_subtype_name[
  648                         (type & IEEE80211_FC0_SUBTYPE_MASK) >>
  649                                 IEEE80211_FC0_SUBTYPE_SHIFT],
  650                     ieee80211_chan2ieee(ic, ic->ic_curchan));
  651         }
  652 #endif
  653         IEEE80211_NODE_STAT(ni, tx_mgmt);
  654 
  655         return ic->ic_raw_xmit(ni, m, params);
  656 }
  657 
  658 /*
  659  * Send a null data frame to the specified node.  If the station
  660  * is setup for QoS then a QoS Null Data frame is constructed.
  661  * If this is a WDS station then a 4-address frame is constructed.
  662  *
  663  * NB: the caller is assumed to have setup a node reference
  664  *     for use; this is necessary to deal with a race condition
  665  *     when probing for inactive stations.  Like ieee80211_mgmt_output
  666  *     we must cleanup any node reference on error;  however we
  667  *     can safely just unref it as we know it will never be the
  668  *     last reference to the node.
  669  */
  670 int
  671 ieee80211_send_nulldata(struct ieee80211_node *ni)
  672 {
  673         struct ieee80211vap *vap = ni->ni_vap;
  674         struct ieee80211com *ic = ni->ni_ic;
  675         struct mbuf *m;
  676         struct ieee80211_frame *wh;
  677         int hdrlen;
  678         uint8_t *frm;
  679 
  680         if (vap->iv_state == IEEE80211_S_CAC) {
  681                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
  682                     ni, "block %s frame in CAC state", "null data");
  683                 ieee80211_unref_node(&ni);
  684                 vap->iv_stats.is_tx_badstate++;
  685                 return EIO;             /* XXX */
  686         }
  687 
  688         if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
  689                 hdrlen = sizeof(struct ieee80211_qosframe);
  690         else
  691                 hdrlen = sizeof(struct ieee80211_frame);
  692         /* NB: only WDS vap's get 4-address frames */
  693         if (vap->iv_opmode == IEEE80211_M_WDS)
  694                 hdrlen += IEEE80211_ADDR_LEN;
  695         if (ic->ic_flags & IEEE80211_F_DATAPAD)
  696                 hdrlen = roundup(hdrlen, sizeof(uint32_t));
  697 
  698         m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
  699         if (m == NULL) {
  700                 /* XXX debug msg */
  701                 ieee80211_unref_node(&ni);
  702                 vap->iv_stats.is_tx_nobuf++;
  703                 return ENOMEM;
  704         }
  705         KASSERT(M_LEADINGSPACE(m) >= hdrlen,
  706             ("leading space %zd", M_LEADINGSPACE(m)));
  707         M_PREPEND(m, hdrlen, M_DONTWAIT);
  708         if (m == NULL) {
  709                 /* NB: cannot happen */
  710                 ieee80211_free_node(ni);
  711                 return ENOMEM;
  712         }
  713 
  714         wh = mtod(m, struct ieee80211_frame *);         /* NB: a little lie */
  715         if (ni->ni_flags & IEEE80211_NODE_QOS) {
  716                 const int tid = WME_AC_TO_TID(WME_AC_BE);
  717                 uint8_t *qos;
  718 
  719                 ieee80211_send_setup(ni, m,
  720                     IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
  721                     tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
  722 
  723                 if (vap->iv_opmode == IEEE80211_M_WDS)
  724                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
  725                 else
  726                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
  727                 qos[0] = tid & IEEE80211_QOS_TID;
  728                 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
  729                         qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
  730                 qos[1] = 0;
  731         } else {
  732                 ieee80211_send_setup(ni, m,
  733                     IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
  734                     IEEE80211_NONQOS_TID,
  735                     vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
  736         }
  737         if (vap->iv_opmode != IEEE80211_M_WDS) {
  738                 /* NB: power management bit is never sent by an AP */
  739                 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
  740                     vap->iv_opmode != IEEE80211_M_HOSTAP)
  741                         wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
  742         }
  743         m->m_len = m->m_pkthdr.len = hdrlen;
  744         m->m_flags |= M_ENCAP;          /* mark encapsulated */
  745 
  746         M_WME_SETAC(m, WME_AC_BE);
  747 
  748         IEEE80211_NODE_STAT(ni, tx_data);
  749 
  750         IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
  751             "send %snull data frame on channel %u, pwr mgt %s",
  752             ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
  753             ieee80211_chan2ieee(ic, ic->ic_curchan),
  754             wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
  755 
  756         return ic->ic_raw_xmit(ni, m, NULL);
  757 }
  758 
  759 /* 
  760  * Assign priority to a frame based on any vlan tag assigned
  761  * to the station and/or any Diffserv setting in an IP header.
  762  * Finally, if an ACM policy is setup (in station mode) it's
  763  * applied.
  764  */
  765 int
  766 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
  767 {
  768         const struct ether_header *eh = mtod(m, struct ether_header *);
  769         int v_wme_ac, d_wme_ac, ac;
  770 
  771         /*
  772          * Always promote PAE/EAPOL frames to high priority.
  773          */
  774         if (eh->ether_type == htons(ETHERTYPE_PAE)) {
  775                 /* NB: mark so others don't need to check header */
  776                 m->m_flags |= M_EAPOL;
  777                 ac = WME_AC_VO;
  778                 goto done;
  779         }
  780         /*
  781          * Non-qos traffic goes to BE.
  782          */
  783         if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
  784                 ac = WME_AC_BE;
  785                 goto done;
  786         }
  787 
  788         /* 
  789          * If node has a vlan tag then all traffic
  790          * to it must have a matching tag.
  791          */
  792         v_wme_ac = 0;
  793         if (ni->ni_vlan != 0) {
  794                  if ((m->m_flags & M_VLANTAG) == 0) {
  795                         IEEE80211_NODE_STAT(ni, tx_novlantag);
  796                         return 1;
  797                 }
  798                 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
  799                     EVL_VLANOFTAG(ni->ni_vlan)) {
  800                         IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
  801                         return 1;
  802                 }
  803                 /* map vlan priority to AC */
  804                 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
  805         }
  806 
  807         /* XXX m_copydata may be too slow for fast path */
  808 #ifdef INET
  809         if (eh->ether_type == htons(ETHERTYPE_IP)) {
  810                 uint8_t tos;
  811                 /*
  812                  * IP frame, map the DSCP bits from the TOS field.
  813                  */
  814                 /* NB: ip header may not be in first mbuf */
  815                 m_copydata(m, sizeof(struct ether_header) +
  816                     offsetof(struct ip, ip_tos), sizeof(tos), &tos);
  817                 tos >>= 5;              /* NB: ECN + low 3 bits of DSCP */
  818                 d_wme_ac = TID_TO_WME_AC(tos);
  819         } else {
  820 #endif /* INET */
  821 #ifdef INET6
  822         if (eh->ether_type == htons(ETHERTYPE_IPV6)) {
  823                 uint32_t flow;
  824                 uint8_t tos;
  825                 /*
  826                  * IPv6 frame, map the DSCP bits from the TOS field.
  827                  */
  828                 m_copydata(m, sizeof(struct ether_header) +
  829                     offsetof(struct ip6_hdr, ip6_flow), sizeof(flow),
  830                     (caddr_t) &flow);
  831                 tos = (uint8_t)(ntohl(flow) >> 20);
  832                 tos >>= 5;              /* NB: ECN + low 3 bits of DSCP */
  833                 d_wme_ac = TID_TO_WME_AC(tos);
  834         } else {
  835 #endif /* INET6 */
  836                 d_wme_ac = WME_AC_BE;
  837 #ifdef INET6
  838         }
  839 #endif
  840 #ifdef INET
  841         }
  842 #endif
  843         /*
  844          * Use highest priority AC.
  845          */
  846         if (v_wme_ac > d_wme_ac)
  847                 ac = v_wme_ac;
  848         else
  849                 ac = d_wme_ac;
  850 
  851         /*
  852          * Apply ACM policy.
  853          */
  854         if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
  855                 static const int acmap[4] = {
  856                         WME_AC_BK,      /* WME_AC_BE */
  857                         WME_AC_BK,      /* WME_AC_BK */
  858                         WME_AC_BE,      /* WME_AC_VI */
  859                         WME_AC_VI,      /* WME_AC_VO */
  860                 };
  861                 struct ieee80211com *ic = ni->ni_ic;
  862 
  863                 while (ac != WME_AC_BK &&
  864                     ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
  865                         ac = acmap[ac];
  866         }
  867 done:
  868         M_WME_SETAC(m, ac);
  869         return 0;
  870 }
  871 
  872 /*
  873  * Insure there is sufficient contiguous space to encapsulate the
  874  * 802.11 data frame.  If room isn't already there, arrange for it.
  875  * Drivers and cipher modules assume we have done the necessary work
  876  * and fail rudely if they don't find the space they need.
  877  */
  878 struct mbuf *
  879 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
  880         struct ieee80211_key *key, struct mbuf *m)
  881 {
  882 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
  883         int needed_space = vap->iv_ic->ic_headroom + hdrsize;
  884 
  885         if (key != NULL) {
  886                 /* XXX belongs in crypto code? */
  887                 needed_space += key->wk_cipher->ic_header;
  888                 /* XXX frags */
  889                 /*
  890                  * When crypto is being done in the host we must insure
  891                  * the data are writable for the cipher routines; clone
  892                  * a writable mbuf chain.
  893                  * XXX handle SWMIC specially
  894                  */
  895                 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
  896                         m = m_unshare(m, M_NOWAIT);
  897                         if (m == NULL) {
  898                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  899                                     "%s: cannot get writable mbuf\n", __func__);
  900                                 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
  901                                 return NULL;
  902                         }
  903                 }
  904         }
  905         /*
  906          * We know we are called just before stripping an Ethernet
  907          * header and prepending an LLC header.  This means we know
  908          * there will be
  909          *      sizeof(struct ether_header) - sizeof(struct llc)
  910          * bytes recovered to which we need additional space for the
  911          * 802.11 header and any crypto header.
  912          */
  913         /* XXX check trailing space and copy instead? */
  914         if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
  915                 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
  916                 if (n == NULL) {
  917                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  918                             "%s: cannot expand storage\n", __func__);
  919                         vap->iv_stats.is_tx_nobuf++;
  920                         m_freem(m);
  921                         return NULL;
  922                 }
  923                 KASSERT(needed_space <= MHLEN,
  924                     ("not enough room, need %u got %zu\n", needed_space, MHLEN));
  925                 /*
  926                  * Setup new mbuf to have leading space to prepend the
  927                  * 802.11 header and any crypto header bits that are
  928                  * required (the latter are added when the driver calls
  929                  * back to ieee80211_crypto_encap to do crypto encapsulation).
  930                  */
  931                 /* NB: must be first 'cuz it clobbers m_data */
  932                 m_move_pkthdr(n, m);
  933                 n->m_len = 0;                   /* NB: m_gethdr does not set */
  934                 n->m_data += needed_space;
  935                 /*
  936                  * Pull up Ethernet header to create the expected layout.
  937                  * We could use m_pullup but that's overkill (i.e. we don't
  938                  * need the actual data) and it cannot fail so do it inline
  939                  * for speed.
  940                  */
  941                 /* NB: struct ether_header is known to be contiguous */
  942                 n->m_len += sizeof(struct ether_header);
  943                 m->m_len -= sizeof(struct ether_header);
  944                 m->m_data += sizeof(struct ether_header);
  945                 /*
  946                  * Replace the head of the chain.
  947                  */
  948                 n->m_next = m;
  949                 m = n;
  950         }
  951         return m;
  952 #undef TO_BE_RECLAIMED
  953 }
  954 
  955 /*
  956  * Return the transmit key to use in sending a unicast frame.
  957  * If a unicast key is set we use that.  When no unicast key is set
  958  * we fall back to the default transmit key.
  959  */ 
  960 static __inline struct ieee80211_key *
  961 ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
  962         struct ieee80211_node *ni)
  963 {
  964         if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
  965                 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
  966                     IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
  967                         return NULL;
  968                 return &vap->iv_nw_keys[vap->iv_def_txkey];
  969         } else {
  970                 return &ni->ni_ucastkey;
  971         }
  972 }
  973 
  974 /*
  975  * Return the transmit key to use in sending a multicast frame.
  976  * Multicast traffic always uses the group key which is installed as
  977  * the default tx key.
  978  */ 
  979 static __inline struct ieee80211_key *
  980 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
  981         struct ieee80211_node *ni)
  982 {
  983         if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
  984             IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
  985                 return NULL;
  986         return &vap->iv_nw_keys[vap->iv_def_txkey];
  987 }
  988 
  989 /*
  990  * Encapsulate an outbound data frame.  The mbuf chain is updated.
  991  * If an error is encountered NULL is returned.  The caller is required
  992  * to provide a node reference and pullup the ethernet header in the
  993  * first mbuf.
  994  *
  995  * NB: Packet is assumed to be processed by ieee80211_classify which
  996  *     marked EAPOL frames w/ M_EAPOL.
  997  */
  998 struct mbuf *
  999 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1000     struct mbuf *m)
 1001 {
 1002 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
 1003         struct ieee80211com *ic = ni->ni_ic;
 1004 #ifdef IEEE80211_SUPPORT_MESH
 1005         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1006         struct ieee80211_meshcntl_ae10 *mc;
 1007 #endif
 1008         struct ether_header eh;
 1009         struct ieee80211_frame *wh;
 1010         struct ieee80211_key *key;
 1011         struct llc *llc;
 1012         int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
 1013         ieee80211_seq seqno;
 1014         int meshhdrsize, meshae;
 1015         uint8_t *qos;
 1016 
 1017         /*
 1018          * Copy existing Ethernet header to a safe place.  The
 1019          * rest of the code assumes it's ok to strip it when
 1020          * reorganizing state for the final encapsulation.
 1021          */
 1022         KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
 1023         ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
 1024 
 1025         /*
 1026          * Insure space for additional headers.  First identify
 1027          * transmit key to use in calculating any buffer adjustments
 1028          * required.  This is also used below to do privacy
 1029          * encapsulation work.  Then calculate the 802.11 header
 1030          * size and any padding required by the driver.
 1031          *
 1032          * Note key may be NULL if we fall back to the default
 1033          * transmit key and that is not set.  In that case the
 1034          * buffer may not be expanded as needed by the cipher
 1035          * routines, but they will/should discard it.
 1036          */
 1037         if (vap->iv_flags & IEEE80211_F_PRIVACY) {
 1038                 if (vap->iv_opmode == IEEE80211_M_STA ||
 1039                     !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
 1040                     (vap->iv_opmode == IEEE80211_M_WDS &&
 1041                      (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
 1042                         key = ieee80211_crypto_getucastkey(vap, ni);
 1043                 else
 1044                         key = ieee80211_crypto_getmcastkey(vap, ni);
 1045                 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
 1046                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
 1047                             eh.ether_dhost,
 1048                             "no default transmit key (%s) deftxkey %u",
 1049                             __func__, vap->iv_def_txkey);
 1050                         vap->iv_stats.is_tx_nodefkey++;
 1051                         goto bad;
 1052                 }
 1053         } else
 1054                 key = NULL;
 1055         /*
 1056          * XXX Some ap's don't handle QoS-encapsulated EAPOL
 1057          * frames so suppress use.  This may be an issue if other
 1058          * ap's require all data frames to be QoS-encapsulated
 1059          * once negotiated in which case we'll need to make this
 1060          * configurable.
 1061          */
 1062         addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) &&
 1063                  (m->m_flags & M_EAPOL) == 0;
 1064         if (addqos)
 1065                 hdrsize = sizeof(struct ieee80211_qosframe);
 1066         else
 1067                 hdrsize = sizeof(struct ieee80211_frame);
 1068 #ifdef IEEE80211_SUPPORT_MESH
 1069         if (vap->iv_opmode == IEEE80211_M_MBSS) {
 1070                 /*
 1071                  * Mesh data frames are encapsulated according to the
 1072                  * rules of Section 11B.8.5 (p.139 of D3.0 spec).
 1073                  * o Group Addressed data (aka multicast) originating
 1074                  *   at the local sta are sent w/ 3-address format and
 1075                  *   address extension mode 00
 1076                  * o Individually Addressed data (aka unicast) originating
 1077                  *   at the local sta are sent w/ 4-address format and
 1078                  *   address extension mode 00
 1079                  * o Group Addressed data forwarded from a non-mesh sta are
 1080                  *   sent w/ 3-address format and address extension mode 01
 1081                  * o Individually Address data from another sta are sent
 1082                  *   w/ 4-address format and address extension mode 10
 1083                  */
 1084                 is4addr = 0;            /* NB: don't use, disable */
 1085                 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost))
 1086                         hdrsize += IEEE80211_ADDR_LEN;  /* unicast are 4-addr */
 1087                 meshhdrsize = sizeof(struct ieee80211_meshcntl);
 1088                 /* XXX defines for AE modes */
 1089                 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) {
 1090                         if (!IEEE80211_IS_MULTICAST(eh.ether_dhost))
 1091                                 meshae = 0;
 1092                         else
 1093                                 meshae = 4;             /* NB: pseudo */
 1094                 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) {
 1095                         meshae = 1;
 1096                         meshhdrsize += 1*IEEE80211_ADDR_LEN;
 1097                 } else {
 1098                         meshae = 2;
 1099                         meshhdrsize += 2*IEEE80211_ADDR_LEN;
 1100                 }
 1101         } else {
 1102 #endif
 1103                 /*
 1104                  * 4-address frames need to be generated for:
 1105                  * o packets sent through a WDS vap (IEEE80211_M_WDS)
 1106                  * o packets sent through a vap marked for relaying
 1107                  *   (e.g. a station operating with dynamic WDS)
 1108                  */
 1109                 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
 1110                     ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
 1111                      !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
 1112                 if (is4addr)
 1113                         hdrsize += IEEE80211_ADDR_LEN;
 1114                 meshhdrsize = meshae = 0;
 1115 #ifdef IEEE80211_SUPPORT_MESH
 1116         }
 1117 #endif
 1118         /*
 1119          * Honor driver DATAPAD requirement.
 1120          */
 1121         if (ic->ic_flags & IEEE80211_F_DATAPAD)
 1122                 hdrspace = roundup(hdrsize, sizeof(uint32_t));
 1123         else
 1124                 hdrspace = hdrsize;
 1125 
 1126         if (__predict_true((m->m_flags & M_FF) == 0)) {
 1127                 /*
 1128                  * Normal frame.
 1129                  */
 1130                 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
 1131                 if (m == NULL) {
 1132                         /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
 1133                         goto bad;
 1134                 }
 1135                 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
 1136                 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
 1137                 llc = mtod(m, struct llc *);
 1138                 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 1139                 llc->llc_control = LLC_UI;
 1140                 llc->llc_snap.org_code[0] = 0;
 1141                 llc->llc_snap.org_code[1] = 0;
 1142                 llc->llc_snap.org_code[2] = 0;
 1143                 llc->llc_snap.ether_type = eh.ether_type;
 1144         } else {
 1145 #ifdef IEEE80211_SUPPORT_SUPERG
 1146                 /*
 1147                  * Aggregated frame.
 1148                  */
 1149                 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key);
 1150                 if (m == NULL)
 1151 #endif
 1152                         goto bad;
 1153         }
 1154         datalen = m->m_pkthdr.len;              /* NB: w/o 802.11 header */
 1155 
 1156         M_PREPEND(m, hdrspace + meshhdrsize, M_DONTWAIT);
 1157         if (m == NULL) {
 1158                 vap->iv_stats.is_tx_nobuf++;
 1159                 goto bad;
 1160         }
 1161         wh = mtod(m, struct ieee80211_frame *);
 1162         wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
 1163         *(uint16_t *)wh->i_dur = 0;
 1164         qos = NULL;     /* NB: quiet compiler */
 1165         if (is4addr) {
 1166                 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
 1167                 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
 1168                 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1169                 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
 1170                 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
 1171         } else switch (vap->iv_opmode) {
 1172         case IEEE80211_M_STA:
 1173                 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
 1174                 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
 1175                 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
 1176                 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
 1177                 break;
 1178         case IEEE80211_M_IBSS:
 1179         case IEEE80211_M_AHDEMO:
 1180                 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 1181                 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1182                 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
 1183                 /*
 1184                  * NB: always use the bssid from iv_bss as the
 1185                  *     neighbor's may be stale after an ibss merge
 1186                  */
 1187                 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
 1188                 break;
 1189         case IEEE80211_M_HOSTAP:
 1190                 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
 1191                 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1192                 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
 1193                 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
 1194                 break;
 1195 #ifdef IEEE80211_SUPPORT_MESH
 1196         case IEEE80211_M_MBSS:
 1197                 /* NB: offset by hdrspace to deal with DATAPAD */
 1198                 mc = (struct ieee80211_meshcntl_ae10 *)
 1199                      (mtod(m, uint8_t *) + hdrspace);
 1200                 switch (meshae) {
 1201                 case 0:                 /* ucast, no proxy */
 1202                         wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
 1203                         IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
 1204                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1205                         IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
 1206                         IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
 1207                         mc->mc_flags = 0;
 1208                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
 1209                         break;
 1210                 case 4:                 /* mcast, no proxy */
 1211                         wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
 1212                         IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1213                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1214                         IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
 1215                         mc->mc_flags = 0;               /* NB: AE is really 0 */
 1216                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
 1217                         break;
 1218                 case 1:                 /* mcast, proxy */
 1219                         wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
 1220                         IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1221                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1222                         IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr);
 1223                         mc->mc_flags = 1;
 1224                         IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost);
 1225                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
 1226                         break;
 1227                 case 2:                 /* ucast, proxy */
 1228                         wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
 1229                         IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
 1230                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1231                         /* XXX not right, need MeshDA */
 1232                         IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
 1233                         /* XXX assume are MeshSA */
 1234                         IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr);
 1235                         mc->mc_flags = 2;
 1236                         IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost);
 1237                         IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost);
 1238                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
 1239                         break;
 1240                 default:
 1241                         KASSERT(0, ("meshae %d", meshae));
 1242                         break;
 1243                 }
 1244                 mc->mc_ttl = ms->ms_ttl;
 1245                 ms->ms_seq++;
 1246                 LE_WRITE_4(mc->mc_seq, ms->ms_seq);
 1247                 break;
 1248 #endif
 1249         case IEEE80211_M_WDS:           /* NB: is4addr should always be true */
 1250         default:
 1251                 goto bad;
 1252         }
 1253         if (m->m_flags & M_MORE_DATA)
 1254                 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
 1255         if (addqos) {
 1256                 int ac, tid;
 1257 
 1258                 if (is4addr) {
 1259                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
 1260                 /* NB: mesh case handled earlier */
 1261                 } else if (vap->iv_opmode != IEEE80211_M_MBSS)
 1262                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
 1263                 ac = M_WME_GETAC(m);
 1264                 /* map from access class/queue to 11e header priorty value */
 1265                 tid = WME_AC_TO_TID(ac);
 1266                 qos[0] = tid & IEEE80211_QOS_TID;
 1267                 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
 1268                         qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
 1269                 qos[1] = 0;
 1270                 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
 1271 
 1272                 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
 1273                         /*
 1274                          * NB: don't assign a sequence # to potential
 1275                          * aggregates; we expect this happens at the
 1276                          * point the frame comes off any aggregation q
 1277                          * as otherwise we may introduce holes in the
 1278                          * BA sequence space and/or make window accouting
 1279                          * more difficult.
 1280                          *
 1281                          * XXX may want to control this with a driver
 1282                          * capability; this may also change when we pull
 1283                          * aggregation up into net80211
 1284                          */
 1285                         seqno = ni->ni_txseqs[tid]++;
 1286                         *(uint16_t *)wh->i_seq =
 1287                             htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
 1288                         M_SEQNO_SET(m, seqno);
 1289                 }
 1290         } else {
 1291                 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
 1292                 *(uint16_t *)wh->i_seq =
 1293                     htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
 1294                 M_SEQNO_SET(m, seqno);
 1295         }
 1296 
 1297 
 1298         /* check if xmit fragmentation is required */
 1299         txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
 1300             !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
 1301             (vap->iv_caps & IEEE80211_C_TXFRAG) &&
 1302             (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
 1303         if (key != NULL) {
 1304                 /*
 1305                  * IEEE 802.1X: send EAPOL frames always in the clear.
 1306                  * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
 1307                  */
 1308                 if ((m->m_flags & M_EAPOL) == 0 ||
 1309                     ((vap->iv_flags & IEEE80211_F_WPA) &&
 1310                      (vap->iv_opmode == IEEE80211_M_STA ?
 1311                       !IEEE80211_KEY_UNDEFINED(key) :
 1312                       !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
 1313                         wh->i_fc[1] |= IEEE80211_FC1_WEP;
 1314                         if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
 1315                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
 1316                                     eh.ether_dhost,
 1317                                     "%s", "enmic failed, discard frame");
 1318                                 vap->iv_stats.is_crypto_enmicfail++;
 1319                                 goto bad;
 1320                         }
 1321                 }
 1322         }
 1323         if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
 1324             key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
 1325                 goto bad;
 1326 
 1327         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 1328 
 1329         IEEE80211_NODE_STAT(ni, tx_data);
 1330         if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1331                 IEEE80211_NODE_STAT(ni, tx_mcast);
 1332                 m->m_flags |= M_MCAST;
 1333         } else
 1334                 IEEE80211_NODE_STAT(ni, tx_ucast);
 1335         IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
 1336 
 1337         return m;
 1338 bad:
 1339         if (m != NULL)
 1340                 m_freem(m);
 1341         return NULL;
 1342 #undef WH4
 1343 }
 1344 
 1345 /*
 1346  * Fragment the frame according to the specified mtu.
 1347  * The size of the 802.11 header (w/o padding) is provided
 1348  * so we don't need to recalculate it.  We create a new
 1349  * mbuf for each fragment and chain it through m_nextpkt;
 1350  * we might be able to optimize this by reusing the original
 1351  * packet's mbufs but that is significantly more complicated.
 1352  */
 1353 static int
 1354 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
 1355         u_int hdrsize, u_int ciphdrsize, u_int mtu)
 1356 {
 1357         struct ieee80211_frame *wh, *whf;
 1358         struct mbuf *m, *prev, *next;
 1359         u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
 1360 
 1361         KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
 1362         KASSERT(m0->m_pkthdr.len > mtu,
 1363                 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
 1364 
 1365         wh = mtod(m0, struct ieee80211_frame *);
 1366         /* NB: mark the first frag; it will be propagated below */
 1367         wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
 1368         totalhdrsize = hdrsize + ciphdrsize;
 1369         fragno = 1;
 1370         off = mtu - ciphdrsize;
 1371         remainder = m0->m_pkthdr.len - off;
 1372         prev = m0;
 1373         do {
 1374                 fragsize = totalhdrsize + remainder;
 1375                 if (fragsize > mtu)
 1376                         fragsize = mtu;
 1377                 /* XXX fragsize can be >2048! */
 1378                 KASSERT(fragsize < MCLBYTES,
 1379                         ("fragment size %u too big!", fragsize));
 1380                 if (fragsize > MHLEN)
 1381                         m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
 1382                 else
 1383                         m = m_gethdr(M_DONTWAIT, MT_DATA);
 1384                 if (m == NULL)
 1385                         goto bad;
 1386                 /* leave room to prepend any cipher header */
 1387                 m_align(m, fragsize - ciphdrsize);
 1388 
 1389                 /*
 1390                  * Form the header in the fragment.  Note that since
 1391                  * we mark the first fragment with the MORE_FRAG bit
 1392                  * it automatically is propagated to each fragment; we
 1393                  * need only clear it on the last fragment (done below).
 1394                  */
 1395                 whf = mtod(m, struct ieee80211_frame *);
 1396                 memcpy(whf, wh, hdrsize);
 1397                 *(uint16_t *)&whf->i_seq[0] |= htole16(
 1398                         (fragno & IEEE80211_SEQ_FRAG_MASK) <<
 1399                                 IEEE80211_SEQ_FRAG_SHIFT);
 1400                 fragno++;
 1401 
 1402                 payload = fragsize - totalhdrsize;
 1403                 /* NB: destination is known to be contiguous */
 1404                 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize);
 1405                 m->m_len = hdrsize + payload;
 1406                 m->m_pkthdr.len = hdrsize + payload;
 1407                 m->m_flags |= M_FRAG;
 1408 
 1409                 /* chain up the fragment */
 1410                 prev->m_nextpkt = m;
 1411                 prev = m;
 1412 
 1413                 /* deduct fragment just formed */
 1414                 remainder -= payload;
 1415                 off += payload;
 1416         } while (remainder != 0);
 1417 
 1418         /* set the last fragment */
 1419         m->m_flags |= M_LASTFRAG;
 1420         whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
 1421 
 1422         /* strip first mbuf now that everything has been copied */
 1423         m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
 1424         m0->m_flags |= M_FIRSTFRAG | M_FRAG;
 1425 
 1426         vap->iv_stats.is_tx_fragframes++;
 1427         vap->iv_stats.is_tx_frags += fragno-1;
 1428 
 1429         return 1;
 1430 bad:
 1431         /* reclaim fragments but leave original frame for caller to free */
 1432         for (m = m0->m_nextpkt; m != NULL; m = next) {
 1433                 next = m->m_nextpkt;
 1434                 m->m_nextpkt = NULL;            /* XXX paranoid */
 1435                 m_freem(m);
 1436         }
 1437         m0->m_nextpkt = NULL;
 1438         return 0;
 1439 }
 1440 
 1441 /*
 1442  * Add a supported rates element id to a frame.
 1443  */
 1444 uint8_t *
 1445 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
 1446 {
 1447         int nrates;
 1448 
 1449         *frm++ = IEEE80211_ELEMID_RATES;
 1450         nrates = rs->rs_nrates;
 1451         if (nrates > IEEE80211_RATE_SIZE)
 1452                 nrates = IEEE80211_RATE_SIZE;
 1453         *frm++ = nrates;
 1454         memcpy(frm, rs->rs_rates, nrates);
 1455         return frm + nrates;
 1456 }
 1457 
 1458 /*
 1459  * Add an extended supported rates element id to a frame.
 1460  */
 1461 uint8_t *
 1462 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
 1463 {
 1464         /*
 1465          * Add an extended supported rates element if operating in 11g mode.
 1466          */
 1467         if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
 1468                 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
 1469                 *frm++ = IEEE80211_ELEMID_XRATES;
 1470                 *frm++ = nrates;
 1471                 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
 1472                 frm += nrates;
 1473         }
 1474         return frm;
 1475 }
 1476 
 1477 /* 
 1478  * Add an ssid element to a frame.
 1479  */
 1480 static uint8_t *
 1481 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
 1482 {
 1483         *frm++ = IEEE80211_ELEMID_SSID;
 1484         *frm++ = len;
 1485         memcpy(frm, ssid, len);
 1486         return frm + len;
 1487 }
 1488 
 1489 /*
 1490  * Add an erp element to a frame.
 1491  */
 1492 static uint8_t *
 1493 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
 1494 {
 1495         uint8_t erp;
 1496 
 1497         *frm++ = IEEE80211_ELEMID_ERP;
 1498         *frm++ = 1;
 1499         erp = 0;
 1500         if (ic->ic_nonerpsta != 0)
 1501                 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
 1502         if (ic->ic_flags & IEEE80211_F_USEPROT)
 1503                 erp |= IEEE80211_ERP_USE_PROTECTION;
 1504         if (ic->ic_flags & IEEE80211_F_USEBARKER)
 1505                 erp |= IEEE80211_ERP_LONG_PREAMBLE;
 1506         *frm++ = erp;
 1507         return frm;
 1508 }
 1509 
 1510 /*
 1511  * Add a CFParams element to a frame.
 1512  */
 1513 static uint8_t *
 1514 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
 1515 {
 1516 #define ADDSHORT(frm, v) do {   \
 1517         LE_WRITE_2(frm, v);     \
 1518         frm += 2;               \
 1519 } while (0)
 1520         *frm++ = IEEE80211_ELEMID_CFPARMS;
 1521         *frm++ = 6;
 1522         *frm++ = 0;             /* CFP count */
 1523         *frm++ = 2;             /* CFP period */
 1524         ADDSHORT(frm, 0);       /* CFP MaxDuration (TU) */
 1525         ADDSHORT(frm, 0);       /* CFP CurRemaining (TU) */
 1526         return frm;
 1527 #undef ADDSHORT
 1528 }
 1529 
 1530 static __inline uint8_t *
 1531 add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
 1532 {
 1533         memcpy(frm, ie->ie_data, ie->ie_len);
 1534         return frm + ie->ie_len;
 1535 }
 1536 
 1537 static __inline uint8_t *
 1538 add_ie(uint8_t *frm, const uint8_t *ie)
 1539 {
 1540         memcpy(frm, ie, 2 + ie[1]);
 1541         return frm + 2 + ie[1];
 1542 }
 1543 
 1544 #define WME_OUI_BYTES           0x00, 0x50, 0xf2
 1545 /*
 1546  * Add a WME information element to a frame.
 1547  */
 1548 static uint8_t *
 1549 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
 1550 {
 1551         static const struct ieee80211_wme_info info = {
 1552                 .wme_id         = IEEE80211_ELEMID_VENDOR,
 1553                 .wme_len        = sizeof(struct ieee80211_wme_info) - 2,
 1554                 .wme_oui        = { WME_OUI_BYTES },
 1555                 .wme_type       = WME_OUI_TYPE,
 1556                 .wme_subtype    = WME_INFO_OUI_SUBTYPE,
 1557                 .wme_version    = WME_VERSION,
 1558                 .wme_info       = 0,
 1559         };
 1560         memcpy(frm, &info, sizeof(info));
 1561         return frm + sizeof(info); 
 1562 }
 1563 
 1564 /*
 1565  * Add a WME parameters element to a frame.
 1566  */
 1567 static uint8_t *
 1568 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
 1569 {
 1570 #define SM(_v, _f)      (((_v) << _f##_S) & _f)
 1571 #define ADDSHORT(frm, v) do {   \
 1572         LE_WRITE_2(frm, v);     \
 1573         frm += 2;               \
 1574 } while (0)
 1575         /* NB: this works 'cuz a param has an info at the front */
 1576         static const struct ieee80211_wme_info param = {
 1577                 .wme_id         = IEEE80211_ELEMID_VENDOR,
 1578                 .wme_len        = sizeof(struct ieee80211_wme_param) - 2,
 1579                 .wme_oui        = { WME_OUI_BYTES },
 1580                 .wme_type       = WME_OUI_TYPE,
 1581                 .wme_subtype    = WME_PARAM_OUI_SUBTYPE,
 1582                 .wme_version    = WME_VERSION,
 1583         };
 1584         int i;
 1585 
 1586         memcpy(frm, &param, sizeof(param));
 1587         frm += __offsetof(struct ieee80211_wme_info, wme_info);
 1588         *frm++ = wme->wme_bssChanParams.cap_info;       /* AC info */
 1589         *frm++ = 0;                                     /* reserved field */
 1590         for (i = 0; i < WME_NUM_AC; i++) {
 1591                 const struct wmeParams *ac =
 1592                        &wme->wme_bssChanParams.cap_wmeParams[i];
 1593                 *frm++ = SM(i, WME_PARAM_ACI)
 1594                        | SM(ac->wmep_acm, WME_PARAM_ACM)
 1595                        | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
 1596                        ;
 1597                 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
 1598                        | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
 1599                        ;
 1600                 ADDSHORT(frm, ac->wmep_txopLimit);
 1601         }
 1602         return frm;
 1603 #undef SM
 1604 #undef ADDSHORT
 1605 }
 1606 #undef WME_OUI_BYTES
 1607 
 1608 /*
 1609  * Add an 11h Power Constraint element to a frame.
 1610  */
 1611 static uint8_t *
 1612 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
 1613 {
 1614         const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
 1615         /* XXX per-vap tx power limit? */
 1616         int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
 1617 
 1618         frm[0] = IEEE80211_ELEMID_PWRCNSTR;
 1619         frm[1] = 1;
 1620         frm[2] = c->ic_maxregpower > limit ?  c->ic_maxregpower - limit : 0;
 1621         return frm + 3;
 1622 }
 1623 
 1624 /*
 1625  * Add an 11h Power Capability element to a frame.
 1626  */
 1627 static uint8_t *
 1628 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
 1629 {
 1630         frm[0] = IEEE80211_ELEMID_PWRCAP;
 1631         frm[1] = 2;
 1632         frm[2] = c->ic_minpower;
 1633         frm[3] = c->ic_maxpower;
 1634         return frm + 4;
 1635 }
 1636 
 1637 /*
 1638  * Add an 11h Supported Channels element to a frame.
 1639  */
 1640 static uint8_t *
 1641 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
 1642 {
 1643         static const int ielen = 26;
 1644 
 1645         frm[0] = IEEE80211_ELEMID_SUPPCHAN;
 1646         frm[1] = ielen;
 1647         /* XXX not correct */
 1648         memcpy(frm+2, ic->ic_chan_avail, ielen);
 1649         return frm + 2 + ielen;
 1650 }
 1651 
 1652 /*
 1653  * Add an 11h Channel Switch Announcement element to a frame.
 1654  * Note that we use the per-vap CSA count to adjust the global
 1655  * counter so we can use this routine to form probe response
 1656  * frames and get the current count.
 1657  */
 1658 static uint8_t *
 1659 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
 1660 {
 1661         struct ieee80211com *ic = vap->iv_ic;
 1662         struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
 1663 
 1664         csa->csa_ie = IEEE80211_ELEMID_CSA;
 1665         csa->csa_len = 3;
 1666         csa->csa_mode = 1;              /* XXX force quiet on channel */
 1667         csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
 1668         csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
 1669         return frm + sizeof(*csa);
 1670 }
 1671 
 1672 /*
 1673  * Add an 11h country information element to a frame.
 1674  */
 1675 static uint8_t *
 1676 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
 1677 {
 1678 
 1679         if (ic->ic_countryie == NULL ||
 1680             ic->ic_countryie_chan != ic->ic_bsschan) {
 1681                 /*
 1682                  * Handle lazy construction of ie.  This is done on
 1683                  * first use and after a channel change that requires
 1684                  * re-calculation.
 1685                  */
 1686                 if (ic->ic_countryie != NULL)
 1687                         free(ic->ic_countryie, M_80211_NODE_IE);
 1688                 ic->ic_countryie = ieee80211_alloc_countryie(ic);
 1689                 if (ic->ic_countryie == NULL)
 1690                         return frm;
 1691                 ic->ic_countryie_chan = ic->ic_bsschan;
 1692         }
 1693         return add_appie(frm, ic->ic_countryie);
 1694 }
 1695 
 1696 /*
 1697  * Send a probe request frame with the specified ssid
 1698  * and any optional information element data.
 1699  */
 1700 int
 1701 ieee80211_send_probereq(struct ieee80211_node *ni,
 1702         const uint8_t sa[IEEE80211_ADDR_LEN],
 1703         const uint8_t da[IEEE80211_ADDR_LEN],
 1704         const uint8_t bssid[IEEE80211_ADDR_LEN],
 1705         const uint8_t *ssid, size_t ssidlen)
 1706 {
 1707         struct ieee80211vap *vap = ni->ni_vap;
 1708         struct ieee80211com *ic = ni->ni_ic;
 1709         const struct ieee80211_txparam *tp;
 1710         struct ieee80211_bpf_params params;
 1711         struct ieee80211_frame *wh;
 1712         const struct ieee80211_rateset *rs;
 1713         struct mbuf *m;
 1714         uint8_t *frm;
 1715 
 1716         if (vap->iv_state == IEEE80211_S_CAC) {
 1717                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
 1718                     "block %s frame in CAC state", "probe request");
 1719                 vap->iv_stats.is_tx_badstate++;
 1720                 return EIO;             /* XXX */
 1721         }
 1722 
 1723         /*
 1724          * Hold a reference on the node so it doesn't go away until after
 1725          * the xmit is complete all the way in the driver.  On error we
 1726          * will remove our reference.
 1727          */
 1728         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1729                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 1730                 __func__, __LINE__,
 1731                 ni, ether_sprintf(ni->ni_macaddr),
 1732                 ieee80211_node_refcnt(ni)+1);
 1733         ieee80211_ref_node(ni);
 1734 
 1735         /*
 1736          * prreq frame format
 1737          *      [tlv] ssid
 1738          *      [tlv] supported rates
 1739          *      [tlv] RSN (optional)
 1740          *      [tlv] extended supported rates
 1741          *      [tlv] WPA (optional)
 1742          *      [tlv] user-specified ie's
 1743          */
 1744         m = ieee80211_getmgtframe(&frm,
 1745                  ic->ic_headroom + sizeof(struct ieee80211_frame),
 1746                  2 + IEEE80211_NWID_LEN
 1747                + 2 + IEEE80211_RATE_SIZE
 1748                + sizeof(struct ieee80211_ie_wpa)
 1749                + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 1750                + sizeof(struct ieee80211_ie_wpa)
 1751                + (vap->iv_appie_probereq != NULL ?
 1752                    vap->iv_appie_probereq->ie_len : 0)
 1753         );
 1754         if (m == NULL) {
 1755                 vap->iv_stats.is_tx_nobuf++;
 1756                 ieee80211_free_node(ni);
 1757                 return ENOMEM;
 1758         }
 1759 
 1760         frm = ieee80211_add_ssid(frm, ssid, ssidlen);
 1761         rs = ieee80211_get_suprates(ic, ic->ic_curchan);
 1762         frm = ieee80211_add_rates(frm, rs);
 1763         if (vap->iv_flags & IEEE80211_F_WPA2) {
 1764                 if (vap->iv_rsn_ie != NULL)
 1765                         frm = add_ie(frm, vap->iv_rsn_ie);
 1766                 /* XXX else complain? */
 1767         }
 1768         frm = ieee80211_add_xrates(frm, rs);
 1769         if (vap->iv_flags & IEEE80211_F_WPA1) {
 1770                 if (vap->iv_wpa_ie != NULL)
 1771                         frm = add_ie(frm, vap->iv_wpa_ie);
 1772                 /* XXX else complain? */
 1773         }
 1774         if (vap->iv_appie_probereq != NULL)
 1775                 frm = add_appie(frm, vap->iv_appie_probereq);
 1776         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 1777 
 1778         KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
 1779             ("leading space %zd", M_LEADINGSPACE(m)));
 1780         M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
 1781         if (m == NULL) {
 1782                 /* NB: cannot happen */
 1783                 ieee80211_free_node(ni);
 1784                 return ENOMEM;
 1785         }
 1786 
 1787         wh = mtod(m, struct ieee80211_frame *);
 1788         ieee80211_send_setup(ni, m,
 1789              IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
 1790              IEEE80211_NONQOS_TID, sa, da, bssid);
 1791         /* XXX power management? */
 1792         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 1793 
 1794         M_WME_SETAC(m, WME_AC_BE);
 1795 
 1796         IEEE80211_NODE_STAT(ni, tx_probereq);
 1797         IEEE80211_NODE_STAT(ni, tx_mgmt);
 1798 
 1799         IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
 1800             "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
 1801             ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
 1802             ssidlen, ssid);
 1803 
 1804         memset(&params, 0, sizeof(params));
 1805         params.ibp_pri = M_WME_GETAC(m);
 1806         tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
 1807         params.ibp_rate0 = tp->mgmtrate;
 1808         if (IEEE80211_IS_MULTICAST(da)) {
 1809                 params.ibp_flags |= IEEE80211_BPF_NOACK;
 1810                 params.ibp_try0 = 1;
 1811         } else
 1812                 params.ibp_try0 = tp->maxretry;
 1813         params.ibp_power = ni->ni_txpower;
 1814         return ic->ic_raw_xmit(ni, m, &params);
 1815 }
 1816 
 1817 /*
 1818  * Calculate capability information for mgt frames.
 1819  */
 1820 uint16_t
 1821 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
 1822 {
 1823         struct ieee80211com *ic = vap->iv_ic;
 1824         uint16_t capinfo;
 1825 
 1826         KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
 1827 
 1828         if (vap->iv_opmode == IEEE80211_M_HOSTAP)
 1829                 capinfo = IEEE80211_CAPINFO_ESS;
 1830         else if (vap->iv_opmode == IEEE80211_M_IBSS)
 1831                 capinfo = IEEE80211_CAPINFO_IBSS;
 1832         else
 1833                 capinfo = 0;
 1834         if (vap->iv_flags & IEEE80211_F_PRIVACY)
 1835                 capinfo |= IEEE80211_CAPINFO_PRIVACY;
 1836         if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
 1837             IEEE80211_IS_CHAN_2GHZ(chan))
 1838                 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
 1839         if (ic->ic_flags & IEEE80211_F_SHSLOT)
 1840                 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
 1841         if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
 1842                 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
 1843         return capinfo;
 1844 }
 1845 
 1846 /*
 1847  * Send a management frame.  The node is for the destination (or ic_bss
 1848  * when in station mode).  Nodes other than ic_bss have their reference
 1849  * count bumped to reflect our use for an indeterminant time.
 1850  */
 1851 int
 1852 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
 1853 {
 1854 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
 1855 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
 1856         struct ieee80211vap *vap = ni->ni_vap;
 1857         struct ieee80211com *ic = ni->ni_ic;
 1858         struct ieee80211_node *bss = vap->iv_bss;
 1859         struct ieee80211_bpf_params params;
 1860         struct mbuf *m;
 1861         uint8_t *frm;
 1862         uint16_t capinfo;
 1863         int has_challenge, is_shared_key, ret, status;
 1864 
 1865         KASSERT(ni != NULL, ("null node"));
 1866 
 1867         /*
 1868          * Hold a reference on the node so it doesn't go away until after
 1869          * the xmit is complete all the way in the driver.  On error we
 1870          * will remove our reference.
 1871          */
 1872         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 1873                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 1874                 __func__, __LINE__,
 1875                 ni, ether_sprintf(ni->ni_macaddr),
 1876                 ieee80211_node_refcnt(ni)+1);
 1877         ieee80211_ref_node(ni);
 1878 
 1879         memset(&params, 0, sizeof(params));
 1880         switch (type) {
 1881 
 1882         case IEEE80211_FC0_SUBTYPE_AUTH:
 1883                 status = arg >> 16;
 1884                 arg &= 0xffff;
 1885                 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
 1886                     arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
 1887                     ni->ni_challenge != NULL);
 1888 
 1889                 /*
 1890                  * Deduce whether we're doing open authentication or
 1891                  * shared key authentication.  We do the latter if
 1892                  * we're in the middle of a shared key authentication
 1893                  * handshake or if we're initiating an authentication
 1894                  * request and configured to use shared key.
 1895                  */
 1896                 is_shared_key = has_challenge ||
 1897                      arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
 1898                      (arg == IEEE80211_AUTH_SHARED_REQUEST &&
 1899                       bss->ni_authmode == IEEE80211_AUTH_SHARED);
 1900 
 1901                 m = ieee80211_getmgtframe(&frm,
 1902                           ic->ic_headroom + sizeof(struct ieee80211_frame),
 1903                           3 * sizeof(uint16_t)
 1904                         + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
 1905                                 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
 1906                 );
 1907                 if (m == NULL)
 1908                         senderr(ENOMEM, is_tx_nobuf);
 1909 
 1910                 ((uint16_t *)frm)[0] =
 1911                     (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
 1912                                     : htole16(IEEE80211_AUTH_ALG_OPEN);
 1913                 ((uint16_t *)frm)[1] = htole16(arg);    /* sequence number */
 1914                 ((uint16_t *)frm)[2] = htole16(status);/* status */
 1915 
 1916                 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
 1917                         ((uint16_t *)frm)[3] =
 1918                             htole16((IEEE80211_CHALLENGE_LEN << 8) |
 1919                             IEEE80211_ELEMID_CHALLENGE);
 1920                         memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
 1921                             IEEE80211_CHALLENGE_LEN);
 1922                         m->m_pkthdr.len = m->m_len =
 1923                                 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
 1924                         if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
 1925                                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 1926                                     "request encrypt frame (%s)", __func__);
 1927                                 /* mark frame for encryption */
 1928                                 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
 1929                         }
 1930                 } else
 1931                         m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
 1932 
 1933                 /* XXX not right for shared key */
 1934                 if (status == IEEE80211_STATUS_SUCCESS)
 1935                         IEEE80211_NODE_STAT(ni, tx_auth);
 1936                 else
 1937                         IEEE80211_NODE_STAT(ni, tx_auth_fail);
 1938 
 1939                 if (vap->iv_opmode == IEEE80211_M_STA)
 1940                         ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
 1941                                 (void *) vap->iv_state);
 1942                 break;
 1943 
 1944         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 1945                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 1946                     "send station deauthenticate (reason %d)", arg);
 1947                 m = ieee80211_getmgtframe(&frm,
 1948                         ic->ic_headroom + sizeof(struct ieee80211_frame),
 1949                         sizeof(uint16_t));
 1950                 if (m == NULL)
 1951                         senderr(ENOMEM, is_tx_nobuf);
 1952                 *(uint16_t *)frm = htole16(arg);        /* reason */
 1953                 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
 1954 
 1955                 IEEE80211_NODE_STAT(ni, tx_deauth);
 1956                 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
 1957 
 1958                 ieee80211_node_unauthorize(ni);         /* port closed */
 1959                 break;
 1960 
 1961         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 1962         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 1963                 /*
 1964                  * asreq frame format
 1965                  *      [2] capability information
 1966                  *      [2] listen interval
 1967                  *      [6*] current AP address (reassoc only)
 1968                  *      [tlv] ssid
 1969                  *      [tlv] supported rates
 1970                  *      [tlv] extended supported rates
 1971                  *      [4] power capability (optional)
 1972                  *      [28] supported channels (optional)
 1973                  *      [tlv] HT capabilities
 1974                  *      [tlv] WME (optional)
 1975                  *      [tlv] Vendor OUI HT capabilities (optional)
 1976                  *      [tlv] Atheros capabilities (if negotiated)
 1977                  *      [tlv] AppIE's (optional)
 1978                  */
 1979                 m = ieee80211_getmgtframe(&frm,
 1980                          ic->ic_headroom + sizeof(struct ieee80211_frame),
 1981                          sizeof(uint16_t)
 1982                        + sizeof(uint16_t)
 1983                        + IEEE80211_ADDR_LEN
 1984                        + 2 + IEEE80211_NWID_LEN
 1985                        + 2 + IEEE80211_RATE_SIZE
 1986                        + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 1987                        + 4
 1988                        + 2 + 26
 1989                        + sizeof(struct ieee80211_wme_info)
 1990                        + sizeof(struct ieee80211_ie_htcap)
 1991                        + 4 + sizeof(struct ieee80211_ie_htcap)
 1992 #ifdef IEEE80211_SUPPORT_SUPERG
 1993                        + sizeof(struct ieee80211_ath_ie)
 1994 #endif
 1995                        + (vap->iv_appie_wpa != NULL ?
 1996                                 vap->iv_appie_wpa->ie_len : 0)
 1997                        + (vap->iv_appie_assocreq != NULL ?
 1998                                 vap->iv_appie_assocreq->ie_len : 0)
 1999                 );
 2000                 if (m == NULL)
 2001                         senderr(ENOMEM, is_tx_nobuf);
 2002 
 2003                 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
 2004                     ("wrong mode %u", vap->iv_opmode));
 2005                 capinfo = IEEE80211_CAPINFO_ESS;
 2006                 if (vap->iv_flags & IEEE80211_F_PRIVACY)
 2007                         capinfo |= IEEE80211_CAPINFO_PRIVACY;
 2008                 /*
 2009                  * NB: Some 11a AP's reject the request when
 2010                  *     short premable is set.
 2011                  */
 2012                 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
 2013                     IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
 2014                         capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
 2015                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 2016                     (ic->ic_caps & IEEE80211_C_SHSLOT))
 2017                         capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
 2018                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
 2019                     (vap->iv_flags & IEEE80211_F_DOTH))
 2020                         capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
 2021                 *(uint16_t *)frm = htole16(capinfo);
 2022                 frm += 2;
 2023 
 2024                 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
 2025                 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
 2026                                                     bss->ni_intval));
 2027                 frm += 2;
 2028 
 2029                 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
 2030                         IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
 2031                         frm += IEEE80211_ADDR_LEN;
 2032                 }
 2033 
 2034                 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
 2035                 frm = ieee80211_add_rates(frm, &ni->ni_rates);
 2036                 if (vap->iv_flags & IEEE80211_F_WPA2) {
 2037                         if (vap->iv_rsn_ie != NULL)
 2038                                 frm = add_ie(frm, vap->iv_rsn_ie);
 2039                         /* XXX else complain? */
 2040                 }
 2041                 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
 2042                 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
 2043                         frm = ieee80211_add_powercapability(frm,
 2044                             ic->ic_curchan);
 2045                         frm = ieee80211_add_supportedchannels(frm, ic);
 2046                 }
 2047                 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
 2048                     ni->ni_ies.htcap_ie != NULL &&
 2049                     ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP)
 2050                         frm = ieee80211_add_htcap(frm, ni);
 2051                 if (vap->iv_flags & IEEE80211_F_WPA1) {
 2052                         if (vap->iv_wpa_ie != NULL)
 2053                                 frm = add_ie(frm, vap->iv_wpa_ie);
 2054                         /* XXX else complain */
 2055                 }
 2056                 if ((ic->ic_flags & IEEE80211_F_WME) &&
 2057                     ni->ni_ies.wme_ie != NULL)
 2058                         frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
 2059                 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
 2060                     ni->ni_ies.htcap_ie != NULL &&
 2061                     ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR)
 2062                         frm = ieee80211_add_htcap_vendor(frm, ni);
 2063 #ifdef IEEE80211_SUPPORT_SUPERG
 2064                 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) {
 2065                         frm = ieee80211_add_ath(frm, 
 2066                                 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
 2067                                 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
 2068                                  ni->ni_authmode != IEEE80211_AUTH_8021X) ?
 2069                                 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
 2070                 }
 2071 #endif /* IEEE80211_SUPPORT_SUPERG */
 2072                 if (vap->iv_appie_assocreq != NULL)
 2073                         frm = add_appie(frm, vap->iv_appie_assocreq);
 2074                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2075 
 2076                 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
 2077                         (void *) vap->iv_state);
 2078                 break;
 2079 
 2080         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 2081         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 2082                 /*
 2083                  * asresp frame format
 2084                  *      [2] capability information
 2085                  *      [2] status
 2086                  *      [2] association ID
 2087                  *      [tlv] supported rates
 2088                  *      [tlv] extended supported rates
 2089                  *      [tlv] HT capabilities (standard, if STA enabled)
 2090                  *      [tlv] HT information (standard, if STA enabled)
 2091                  *      [tlv] WME (if configured and STA enabled)
 2092                  *      [tlv] HT capabilities (vendor OUI, if STA enabled)
 2093                  *      [tlv] HT information (vendor OUI, if STA enabled)
 2094                  *      [tlv] Atheros capabilities (if STA enabled)
 2095                  *      [tlv] AppIE's (optional)
 2096                  */
 2097                 m = ieee80211_getmgtframe(&frm,
 2098                          ic->ic_headroom + sizeof(struct ieee80211_frame),
 2099                          sizeof(uint16_t)
 2100                        + sizeof(uint16_t)
 2101                        + sizeof(uint16_t)
 2102                        + 2 + IEEE80211_RATE_SIZE
 2103                        + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2104                        + sizeof(struct ieee80211_ie_htcap) + 4
 2105                        + sizeof(struct ieee80211_ie_htinfo) + 4
 2106                        + sizeof(struct ieee80211_wme_param)
 2107 #ifdef IEEE80211_SUPPORT_SUPERG
 2108                        + sizeof(struct ieee80211_ath_ie)
 2109 #endif
 2110                        + (vap->iv_appie_assocresp != NULL ?
 2111                                 vap->iv_appie_assocresp->ie_len : 0)
 2112                 );
 2113                 if (m == NULL)
 2114                         senderr(ENOMEM, is_tx_nobuf);
 2115 
 2116                 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
 2117                 *(uint16_t *)frm = htole16(capinfo);
 2118                 frm += 2;
 2119 
 2120                 *(uint16_t *)frm = htole16(arg);        /* status */
 2121                 frm += 2;
 2122 
 2123                 if (arg == IEEE80211_STATUS_SUCCESS) {
 2124                         *(uint16_t *)frm = htole16(ni->ni_associd);
 2125                         IEEE80211_NODE_STAT(ni, tx_assoc);
 2126                 } else
 2127                         IEEE80211_NODE_STAT(ni, tx_assoc_fail);
 2128                 frm += 2;
 2129 
 2130                 frm = ieee80211_add_rates(frm, &ni->ni_rates);
 2131                 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
 2132                 /* NB: respond according to what we received */
 2133                 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) {
 2134                         frm = ieee80211_add_htcap(frm, ni);
 2135                         frm = ieee80211_add_htinfo(frm, ni);
 2136                 }
 2137                 if ((vap->iv_flags & IEEE80211_F_WME) &&
 2138                     ni->ni_ies.wme_ie != NULL)
 2139                         frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
 2140                 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) {
 2141                         frm = ieee80211_add_htcap_vendor(frm, ni);
 2142                         frm = ieee80211_add_htinfo_vendor(frm, ni);
 2143                 }
 2144 #ifdef IEEE80211_SUPPORT_SUPERG
 2145                 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS))
 2146                         frm = ieee80211_add_ath(frm, 
 2147                                 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
 2148                                 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
 2149                                  ni->ni_authmode != IEEE80211_AUTH_8021X) ?
 2150                                 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
 2151 #endif /* IEEE80211_SUPPORT_SUPERG */
 2152                 if (vap->iv_appie_assocresp != NULL)
 2153                         frm = add_appie(frm, vap->iv_appie_assocresp);
 2154                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2155                 break;
 2156 
 2157         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 2158                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 2159                     "send station disassociate (reason %d)", arg);
 2160                 m = ieee80211_getmgtframe(&frm,
 2161                         ic->ic_headroom + sizeof(struct ieee80211_frame),
 2162                         sizeof(uint16_t));
 2163                 if (m == NULL)
 2164                         senderr(ENOMEM, is_tx_nobuf);
 2165                 *(uint16_t *)frm = htole16(arg);        /* reason */
 2166                 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
 2167 
 2168                 IEEE80211_NODE_STAT(ni, tx_disassoc);
 2169                 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
 2170                 break;
 2171 
 2172         default:
 2173                 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
 2174                     "invalid mgmt frame type %u", type);
 2175                 senderr(EINVAL, is_tx_unknownmgt);
 2176                 /* NOTREACHED */
 2177         }
 2178 
 2179         /* NB: force non-ProbeResp frames to the highest queue */
 2180         params.ibp_pri = WME_AC_VO;
 2181         params.ibp_rate0 = bss->ni_txparms->mgmtrate;
 2182         /* NB: we know all frames are unicast */
 2183         params.ibp_try0 = bss->ni_txparms->maxretry;
 2184         params.ibp_power = bss->ni_txpower;
 2185         return ieee80211_mgmt_output(ni, m, type, &params);
 2186 bad:
 2187         ieee80211_free_node(ni);
 2188         return ret;
 2189 #undef senderr
 2190 #undef HTFLAGS
 2191 }
 2192 
 2193 /*
 2194  * Return an mbuf with a probe response frame in it.
 2195  * Space is left to prepend and 802.11 header at the
 2196  * front but it's left to the caller to fill in.
 2197  */
 2198 struct mbuf *
 2199 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy)
 2200 {
 2201         struct ieee80211vap *vap = bss->ni_vap;
 2202         struct ieee80211com *ic = bss->ni_ic;
 2203         const struct ieee80211_rateset *rs;
 2204         struct mbuf *m;
 2205         uint16_t capinfo;
 2206         uint8_t *frm;
 2207 
 2208         /*
 2209          * probe response frame format
 2210          *      [8] time stamp
 2211          *      [2] beacon interval
 2212          *      [2] cabability information
 2213          *      [tlv] ssid
 2214          *      [tlv] supported rates
 2215          *      [tlv] parameter set (FH/DS)
 2216          *      [tlv] parameter set (IBSS)
 2217          *      [tlv] country (optional)
 2218          *      [3] power control (optional)
 2219          *      [5] channel switch announcement (CSA) (optional)
 2220          *      [tlv] extended rate phy (ERP)
 2221          *      [tlv] extended supported rates
 2222          *      [tlv] RSN (optional)
 2223          *      [tlv] HT capabilities
 2224          *      [tlv] HT information
 2225          *      [tlv] WPA (optional)
 2226          *      [tlv] WME (optional)
 2227          *      [tlv] Vendor OUI HT capabilities (optional)
 2228          *      [tlv] Vendor OUI HT information (optional)
 2229          *      [tlv] Atheros capabilities
 2230          *      [tlv] AppIE's (optional)
 2231          *      [tlv] Mesh ID (MBSS)
 2232          *      [tlv] Mesh Conf (MBSS)
 2233          */
 2234         m = ieee80211_getmgtframe(&frm,
 2235                  ic->ic_headroom + sizeof(struct ieee80211_frame),
 2236                  8
 2237                + sizeof(uint16_t)
 2238                + sizeof(uint16_t)
 2239                + 2 + IEEE80211_NWID_LEN
 2240                + 2 + IEEE80211_RATE_SIZE
 2241                + 7      /* max(7,3) */
 2242                + IEEE80211_COUNTRY_MAX_SIZE
 2243                + 3
 2244                + sizeof(struct ieee80211_csa_ie)
 2245                + 3
 2246                + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2247                + sizeof(struct ieee80211_ie_wpa)
 2248                + sizeof(struct ieee80211_ie_htcap)
 2249                + sizeof(struct ieee80211_ie_htinfo)
 2250                + sizeof(struct ieee80211_ie_wpa)
 2251                + sizeof(struct ieee80211_wme_param)
 2252                + 4 + sizeof(struct ieee80211_ie_htcap)
 2253                + 4 + sizeof(struct ieee80211_ie_htinfo)
 2254 #ifdef IEEE80211_SUPPORT_SUPERG
 2255                + sizeof(struct ieee80211_ath_ie)
 2256 #endif
 2257 #ifdef IEEE80211_SUPPORT_MESH
 2258                + 2 + IEEE80211_MESHID_LEN
 2259                + sizeof(struct ieee80211_meshconf_ie)
 2260 #endif
 2261                + (vap->iv_appie_proberesp != NULL ?
 2262                         vap->iv_appie_proberesp->ie_len : 0)
 2263         );
 2264         if (m == NULL) {
 2265                 vap->iv_stats.is_tx_nobuf++;
 2266                 return NULL;
 2267         }
 2268 
 2269         memset(frm, 0, 8);      /* timestamp should be filled later */
 2270         frm += 8;
 2271         *(uint16_t *)frm = htole16(bss->ni_intval);
 2272         frm += 2;
 2273         capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
 2274         *(uint16_t *)frm = htole16(capinfo);
 2275         frm += 2;
 2276 
 2277         frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen);
 2278         rs = ieee80211_get_suprates(ic, bss->ni_chan);
 2279         frm = ieee80211_add_rates(frm, rs);
 2280 
 2281         if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) {
 2282                 *frm++ = IEEE80211_ELEMID_FHPARMS;
 2283                 *frm++ = 5;
 2284                 *frm++ = bss->ni_fhdwell & 0x00ff;
 2285                 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff;
 2286                 *frm++ = IEEE80211_FH_CHANSET(
 2287                     ieee80211_chan2ieee(ic, bss->ni_chan));
 2288                 *frm++ = IEEE80211_FH_CHANPAT(
 2289                     ieee80211_chan2ieee(ic, bss->ni_chan));
 2290                 *frm++ = bss->ni_fhindex;
 2291         } else {
 2292                 *frm++ = IEEE80211_ELEMID_DSPARMS;
 2293                 *frm++ = 1;
 2294                 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan);
 2295         }
 2296 
 2297         if (vap->iv_opmode == IEEE80211_M_IBSS) {
 2298                 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
 2299                 *frm++ = 2;
 2300                 *frm++ = 0; *frm++ = 0;         /* TODO: ATIM window */
 2301         }
 2302         if ((vap->iv_flags & IEEE80211_F_DOTH) ||
 2303             (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
 2304                 frm = ieee80211_add_countryie(frm, ic);
 2305         if (vap->iv_flags & IEEE80211_F_DOTH) {
 2306                 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan))
 2307                         frm = ieee80211_add_powerconstraint(frm, vap);
 2308                 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
 2309                         frm = ieee80211_add_csa(frm, vap);
 2310         }
 2311         if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan))
 2312                 frm = ieee80211_add_erp(frm, ic);
 2313         frm = ieee80211_add_xrates(frm, rs);
 2314         if (vap->iv_flags & IEEE80211_F_WPA2) {
 2315                 if (vap->iv_rsn_ie != NULL)
 2316                         frm = add_ie(frm, vap->iv_rsn_ie);
 2317                 /* XXX else complain? */
 2318         }
 2319         /*
 2320          * NB: legacy 11b clients do not get certain ie's.
 2321          *     The caller identifies such clients by passing
 2322          *     a token in legacy to us.  Could expand this to be
 2323          *     any legacy client for stuff like HT ie's.
 2324          */
 2325         if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
 2326             legacy != IEEE80211_SEND_LEGACY_11B) {
 2327                 frm = ieee80211_add_htcap(frm, bss);
 2328                 frm = ieee80211_add_htinfo(frm, bss);
 2329         }
 2330         if (vap->iv_flags & IEEE80211_F_WPA1) {
 2331                 if (vap->iv_wpa_ie != NULL)
 2332                         frm = add_ie(frm, vap->iv_wpa_ie);
 2333                 /* XXX else complain? */
 2334         }
 2335         if (vap->iv_flags & IEEE80211_F_WME)
 2336                 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
 2337         if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
 2338             (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) &&
 2339             legacy != IEEE80211_SEND_LEGACY_11B) {
 2340                 frm = ieee80211_add_htcap_vendor(frm, bss);
 2341                 frm = ieee80211_add_htinfo_vendor(frm, bss);
 2342         }
 2343 #ifdef IEEE80211_SUPPORT_SUPERG
 2344         if ((vap->iv_flags & IEEE80211_F_ATHEROS) &&
 2345             legacy != IEEE80211_SEND_LEGACY_11B)
 2346                 frm = ieee80211_add_athcaps(frm, bss);
 2347 #endif
 2348         if (vap->iv_appie_proberesp != NULL)
 2349                 frm = add_appie(frm, vap->iv_appie_proberesp);
 2350 #ifdef IEEE80211_SUPPORT_MESH
 2351         if (vap->iv_opmode == IEEE80211_M_MBSS) {
 2352                 frm = ieee80211_add_meshid(frm, vap);
 2353                 frm = ieee80211_add_meshconf(frm, vap);
 2354         }
 2355 #endif
 2356         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2357 
 2358         return m;
 2359 }
 2360 
 2361 /*
 2362  * Send a probe response frame to the specified mac address.
 2363  * This does not go through the normal mgt frame api so we
 2364  * can specify the destination address and re-use the bss node
 2365  * for the sta reference.
 2366  */
 2367 int
 2368 ieee80211_send_proberesp(struct ieee80211vap *vap,
 2369         const uint8_t da[IEEE80211_ADDR_LEN], int legacy)
 2370 {
 2371         struct ieee80211_node *bss = vap->iv_bss;
 2372         struct ieee80211com *ic = vap->iv_ic;
 2373         struct ieee80211_frame *wh;
 2374         struct mbuf *m;
 2375 
 2376         if (vap->iv_state == IEEE80211_S_CAC) {
 2377                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss,
 2378                     "block %s frame in CAC state", "probe response");
 2379                 vap->iv_stats.is_tx_badstate++;
 2380                 return EIO;             /* XXX */
 2381         }
 2382 
 2383         /*
 2384          * Hold a reference on the node so it doesn't go away until after
 2385          * the xmit is complete all the way in the driver.  On error we
 2386          * will remove our reference.
 2387          */
 2388         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2389             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 2390             __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr),
 2391             ieee80211_node_refcnt(bss)+1);
 2392         ieee80211_ref_node(bss);
 2393 
 2394         m = ieee80211_alloc_proberesp(bss, legacy);
 2395         if (m == NULL) {
 2396                 ieee80211_free_node(bss);
 2397                 return ENOMEM;
 2398         }
 2399 
 2400         M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
 2401         KASSERT(m != NULL, ("no room for header"));
 2402 
 2403         wh = mtod(m, struct ieee80211_frame *);
 2404         ieee80211_send_setup(bss, m,
 2405              IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP,
 2406              IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid);
 2407         /* XXX power management? */
 2408         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 2409 
 2410         M_WME_SETAC(m, WME_AC_BE);
 2411 
 2412         IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
 2413             "send probe resp on channel %u to %s%s\n",
 2414             ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da),
 2415             legacy ? " <legacy>" : "");
 2416         IEEE80211_NODE_STAT(bss, tx_mgmt);
 2417 
 2418         return ic->ic_raw_xmit(bss, m, NULL);
 2419 }
 2420 
 2421 /*
 2422  * Allocate and build a RTS (Request To Send) control frame.
 2423  */
 2424 struct mbuf *
 2425 ieee80211_alloc_rts(struct ieee80211com *ic,
 2426         const uint8_t ra[IEEE80211_ADDR_LEN],
 2427         const uint8_t ta[IEEE80211_ADDR_LEN],
 2428         uint16_t dur)
 2429 {
 2430         struct ieee80211_frame_rts *rts;
 2431         struct mbuf *m;
 2432 
 2433         /* XXX honor ic_headroom */
 2434         m = m_gethdr(M_DONTWAIT, MT_DATA);
 2435         if (m != NULL) {
 2436                 rts = mtod(m, struct ieee80211_frame_rts *);
 2437                 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2438                         IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS;
 2439                 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 2440                 *(u_int16_t *)rts->i_dur = htole16(dur);
 2441                 IEEE80211_ADDR_COPY(rts->i_ra, ra);
 2442                 IEEE80211_ADDR_COPY(rts->i_ta, ta);
 2443 
 2444                 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts);
 2445         }
 2446         return m;
 2447 }
 2448 
 2449 /*
 2450  * Allocate and build a CTS (Clear To Send) control frame.
 2451  */
 2452 struct mbuf *
 2453 ieee80211_alloc_cts(struct ieee80211com *ic,
 2454         const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur)
 2455 {
 2456         struct ieee80211_frame_cts *cts;
 2457         struct mbuf *m;
 2458 
 2459         /* XXX honor ic_headroom */
 2460         m = m_gethdr(M_DONTWAIT, MT_DATA);
 2461         if (m != NULL) {
 2462                 cts = mtod(m, struct ieee80211_frame_cts *);
 2463                 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2464                         IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS;
 2465                 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 2466                 *(u_int16_t *)cts->i_dur = htole16(dur);
 2467                 IEEE80211_ADDR_COPY(cts->i_ra, ra);
 2468 
 2469                 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts);
 2470         }
 2471         return m;
 2472 }
 2473 
 2474 static void
 2475 ieee80211_tx_mgt_timeout(void *arg)
 2476 {
 2477         struct ieee80211_node *ni = arg;
 2478         struct ieee80211vap *vap = ni->ni_vap;
 2479 
 2480         if (vap->iv_state != IEEE80211_S_INIT &&
 2481             (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 2482                 /*
 2483                  * NB: it's safe to specify a timeout as the reason here;
 2484                  *     it'll only be used in the right state.
 2485                  */
 2486                 ieee80211_new_state(vap, IEEE80211_S_SCAN,
 2487                         IEEE80211_SCAN_FAIL_TIMEOUT);
 2488         }
 2489 }
 2490 
 2491 static void
 2492 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status)
 2493 {
 2494         struct ieee80211vap *vap = ni->ni_vap;
 2495         enum ieee80211_state ostate = (enum ieee80211_state) arg;
 2496 
 2497         /*
 2498          * Frame transmit completed; arrange timer callback.  If
 2499          * transmit was successfuly we wait for response.  Otherwise
 2500          * we arrange an immediate callback instead of doing the
 2501          * callback directly since we don't know what state the driver
 2502          * is in (e.g. what locks it is holding).  This work should
 2503          * not be too time-critical and not happen too often so the
 2504          * added overhead is acceptable.
 2505          *
 2506          * XXX what happens if !acked but response shows up before callback?
 2507          */
 2508         if (vap->iv_state == ostate)
 2509                 callout_reset(&vap->iv_mgtsend,
 2510                         status == 0 ? IEEE80211_TRANS_WAIT*hz : 0,
 2511                         ieee80211_tx_mgt_timeout, ni);
 2512 }
 2513 
 2514 static void
 2515 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm,
 2516         struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni)
 2517 {
 2518         struct ieee80211vap *vap = ni->ni_vap;
 2519         struct ieee80211com *ic = ni->ni_ic;
 2520         struct ieee80211_rateset *rs = &ni->ni_rates;
 2521         uint16_t capinfo;
 2522 
 2523         /*
 2524          * beacon frame format
 2525          *      [8] time stamp
 2526          *      [2] beacon interval
 2527          *      [2] cabability information
 2528          *      [tlv] ssid
 2529          *      [tlv] supported rates
 2530          *      [3] parameter set (DS)
 2531          *      [8] CF parameter set (optional)
 2532          *      [tlv] parameter set (IBSS/TIM)
 2533          *      [tlv] country (optional)
 2534          *      [3] power control (optional)
 2535          *      [5] channel switch announcement (CSA) (optional)
 2536          *      [tlv] extended rate phy (ERP)
 2537          *      [tlv] extended supported rates
 2538          *      [tlv] RSN parameters
 2539          *      [tlv] HT capabilities
 2540          *      [tlv] HT information
 2541          * XXX Vendor-specific OIDs (e.g. Atheros)
 2542          *      [tlv] WPA parameters
 2543          *      [tlv] WME parameters
 2544          *      [tlv] Vendor OUI HT capabilities (optional)
 2545          *      [tlv] Vendor OUI HT information (optional)
 2546          *      [tlv] Atheros capabilities (optional)
 2547          *      [tlv] TDMA parameters (optional)
 2548          *      [tlv] Mesh ID (MBSS)
 2549          *      [tlv] Mesh Conf (MBSS)
 2550          *      [tlv] application data (optional)
 2551          */
 2552 
 2553         memset(bo, 0, sizeof(*bo));
 2554 
 2555         memset(frm, 0, 8);      /* XXX timestamp is set by hardware/driver */
 2556         frm += 8;
 2557         *(uint16_t *)frm = htole16(ni->ni_intval);
 2558         frm += 2;
 2559         capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
 2560         bo->bo_caps = (uint16_t *)frm;
 2561         *(uint16_t *)frm = htole16(capinfo);
 2562         frm += 2;
 2563         *frm++ = IEEE80211_ELEMID_SSID;
 2564         if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
 2565                 *frm++ = ni->ni_esslen;
 2566                 memcpy(frm, ni->ni_essid, ni->ni_esslen);
 2567                 frm += ni->ni_esslen;
 2568         } else
 2569                 *frm++ = 0;
 2570         frm = ieee80211_add_rates(frm, rs);
 2571         if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) {
 2572                 *frm++ = IEEE80211_ELEMID_DSPARMS;
 2573                 *frm++ = 1;
 2574                 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
 2575         }
 2576         if (ic->ic_flags & IEEE80211_F_PCF) {
 2577                 bo->bo_cfp = frm;
 2578                 frm = ieee80211_add_cfparms(frm, ic);
 2579         }
 2580         bo->bo_tim = frm;
 2581         if (vap->iv_opmode == IEEE80211_M_IBSS) {
 2582                 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
 2583                 *frm++ = 2;
 2584                 *frm++ = 0; *frm++ = 0;         /* TODO: ATIM window */
 2585                 bo->bo_tim_len = 0;
 2586         } else if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2587             vap->iv_opmode == IEEE80211_M_MBSS) {
 2588                 /* TIM IE is the same for Mesh and Hostap */
 2589                 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
 2590 
 2591                 tie->tim_ie = IEEE80211_ELEMID_TIM;
 2592                 tie->tim_len = 4;       /* length */
 2593                 tie->tim_count = 0;     /* DTIM count */ 
 2594                 tie->tim_period = vap->iv_dtim_period;  /* DTIM period */
 2595                 tie->tim_bitctl = 0;    /* bitmap control */
 2596                 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
 2597                 frm += sizeof(struct ieee80211_tim_ie);
 2598                 bo->bo_tim_len = 1;
 2599         }
 2600         bo->bo_tim_trailer = frm;
 2601         if ((vap->iv_flags & IEEE80211_F_DOTH) ||
 2602             (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
 2603                 frm = ieee80211_add_countryie(frm, ic);
 2604         if (vap->iv_flags & IEEE80211_F_DOTH) {
 2605                 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
 2606                         frm = ieee80211_add_powerconstraint(frm, vap);
 2607                 bo->bo_csa = frm;
 2608                 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
 2609                         frm = ieee80211_add_csa(frm, vap);
 2610         } else
 2611                 bo->bo_csa = frm;
 2612         if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) {
 2613                 bo->bo_erp = frm;
 2614                 frm = ieee80211_add_erp(frm, ic);
 2615         }
 2616         frm = ieee80211_add_xrates(frm, rs);
 2617         if (vap->iv_flags & IEEE80211_F_WPA2) {
 2618                 if (vap->iv_rsn_ie != NULL)
 2619                         frm = add_ie(frm, vap->iv_rsn_ie);
 2620                 /* XXX else complain */
 2621         }
 2622         if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
 2623                 frm = ieee80211_add_htcap(frm, ni);
 2624                 bo->bo_htinfo = frm;
 2625                 frm = ieee80211_add_htinfo(frm, ni);
 2626         }
 2627         if (vap->iv_flags & IEEE80211_F_WPA1) {
 2628                 if (vap->iv_wpa_ie != NULL)
 2629                         frm = add_ie(frm, vap->iv_wpa_ie);
 2630                 /* XXX else complain */
 2631         }
 2632         if (vap->iv_flags & IEEE80211_F_WME) {
 2633                 bo->bo_wme = frm;
 2634                 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
 2635         }
 2636         if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
 2637             (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) {
 2638                 frm = ieee80211_add_htcap_vendor(frm, ni);
 2639                 frm = ieee80211_add_htinfo_vendor(frm, ni);
 2640         }
 2641 #ifdef IEEE80211_SUPPORT_SUPERG
 2642         if (vap->iv_flags & IEEE80211_F_ATHEROS) {
 2643                 bo->bo_ath = frm;
 2644                 frm = ieee80211_add_athcaps(frm, ni);
 2645         }
 2646 #endif
 2647 #ifdef IEEE80211_SUPPORT_TDMA
 2648         if (vap->iv_caps & IEEE80211_C_TDMA) {
 2649                 bo->bo_tdma = frm;
 2650                 frm = ieee80211_add_tdma(frm, vap);
 2651         }
 2652 #endif
 2653         if (vap->iv_appie_beacon != NULL) {
 2654                 bo->bo_appie = frm;
 2655                 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
 2656                 frm = add_appie(frm, vap->iv_appie_beacon);
 2657         }
 2658 #ifdef IEEE80211_SUPPORT_MESH
 2659         if (vap->iv_opmode == IEEE80211_M_MBSS) {
 2660                 frm = ieee80211_add_meshid(frm, vap);
 2661                 bo->bo_meshconf = frm;
 2662                 frm = ieee80211_add_meshconf(frm, vap);
 2663         }
 2664 #endif
 2665         bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
 2666         bo->bo_csa_trailer_len = frm - bo->bo_csa;
 2667         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2668 }
 2669 
 2670 /*
 2671  * Allocate a beacon frame and fillin the appropriate bits.
 2672  */
 2673 struct mbuf *
 2674 ieee80211_beacon_alloc(struct ieee80211_node *ni,
 2675         struct ieee80211_beacon_offsets *bo)
 2676 {
 2677         struct ieee80211vap *vap = ni->ni_vap;
 2678         struct ieee80211com *ic = ni->ni_ic;
 2679         struct ifnet *ifp = vap->iv_ifp;
 2680         struct ieee80211_frame *wh;
 2681         struct mbuf *m;
 2682         int pktlen;
 2683         uint8_t *frm;
 2684 
 2685         /*
 2686          * beacon frame format
 2687          *      [8] time stamp
 2688          *      [2] beacon interval
 2689          *      [2] cabability information
 2690          *      [tlv] ssid
 2691          *      [tlv] supported rates
 2692          *      [3] parameter set (DS)
 2693          *      [8] CF parameter set (optional)
 2694          *      [tlv] parameter set (IBSS/TIM)
 2695          *      [tlv] country (optional)
 2696          *      [3] power control (optional)
 2697          *      [5] channel switch announcement (CSA) (optional)
 2698          *      [tlv] extended rate phy (ERP)
 2699          *      [tlv] extended supported rates
 2700          *      [tlv] RSN parameters
 2701          *      [tlv] HT capabilities
 2702          *      [tlv] HT information
 2703          *      [tlv] Vendor OUI HT capabilities (optional)
 2704          *      [tlv] Vendor OUI HT information (optional)
 2705          * XXX Vendor-specific OIDs (e.g. Atheros)
 2706          *      [tlv] WPA parameters
 2707          *      [tlv] WME parameters
 2708          *      [tlv] TDMA parameters (optional)
 2709          *      [tlv] Mesh ID (MBSS)
 2710          *      [tlv] Mesh Conf (MBSS)
 2711          *      [tlv] application data (optional)
 2712          * NB: we allocate the max space required for the TIM bitmap.
 2713          * XXX how big is this?
 2714          */
 2715         pktlen =   8                                    /* time stamp */
 2716                  + sizeof(uint16_t)                     /* beacon interval */
 2717                  + sizeof(uint16_t)                     /* capabilities */
 2718                  + 2 + ni->ni_esslen                    /* ssid */
 2719                  + 2 + IEEE80211_RATE_SIZE              /* supported rates */
 2720                  + 2 + 1                                /* DS parameters */
 2721                  + 2 + 6                                /* CF parameters */
 2722                  + 2 + 4 + vap->iv_tim_len              /* DTIM/IBSSPARMS */
 2723                  + IEEE80211_COUNTRY_MAX_SIZE           /* country */
 2724                  + 2 + 1                                /* power control */
 2725                  + sizeof(struct ieee80211_csa_ie)      /* CSA */
 2726                  + 2 + 1                                /* ERP */
 2727                  + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2728                  + (vap->iv_caps & IEEE80211_C_WPA ?    /* WPA 1+2 */
 2729                         2*sizeof(struct ieee80211_ie_wpa) : 0)
 2730                  /* XXX conditional? */
 2731                  + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
 2732                  + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
 2733                  + (vap->iv_caps & IEEE80211_C_WME ?    /* WME */
 2734                         sizeof(struct ieee80211_wme_param) : 0)
 2735 #ifdef IEEE80211_SUPPORT_SUPERG
 2736                  + sizeof(struct ieee80211_ath_ie)      /* ATH */
 2737 #endif
 2738 #ifdef IEEE80211_SUPPORT_TDMA
 2739                  + (vap->iv_caps & IEEE80211_C_TDMA ?   /* TDMA */
 2740                         sizeof(struct ieee80211_tdma_param) : 0)
 2741 #endif
 2742 #ifdef IEEE80211_SUPPORT_MESH
 2743                  + 2 + ni->ni_meshidlen
 2744                  + sizeof(struct ieee80211_meshconf_ie)
 2745 #endif
 2746                  + IEEE80211_MAX_APPIE
 2747                  ;
 2748         m = ieee80211_getmgtframe(&frm,
 2749                 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
 2750         if (m == NULL) {
 2751                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
 2752                         "%s: cannot get buf; size %u\n", __func__, pktlen);
 2753                 vap->iv_stats.is_tx_nobuf++;
 2754                 return NULL;
 2755         }
 2756         ieee80211_beacon_construct(m, frm, bo, ni);
 2757 
 2758         M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
 2759         KASSERT(m != NULL, ("no space for 802.11 header?"));
 2760         wh = mtod(m, struct ieee80211_frame *);
 2761         wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
 2762             IEEE80211_FC0_SUBTYPE_BEACON;
 2763         wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 2764         *(uint16_t *)wh->i_dur = 0;
 2765         IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
 2766         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 2767         IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
 2768         *(uint16_t *)wh->i_seq = 0;
 2769 
 2770         return m;
 2771 }
 2772 
 2773 /*
 2774  * Update the dynamic parts of a beacon frame based on the current state.
 2775  */
 2776 int
 2777 ieee80211_beacon_update(struct ieee80211_node *ni,
 2778         struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast)
 2779 {
 2780         struct ieee80211vap *vap = ni->ni_vap;
 2781         struct ieee80211com *ic = ni->ni_ic;
 2782         int len_changed = 0;
 2783         uint16_t capinfo;
 2784 
 2785         IEEE80211_LOCK(ic);
 2786         /*
 2787          * Handle 11h channel change when we've reached the count.
 2788          * We must recalculate the beacon frame contents to account
 2789          * for the new channel.  Note we do this only for the first
 2790          * vap that reaches this point; subsequent vaps just update
 2791          * their beacon state to reflect the recalculated channel.
 2792          */
 2793         if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
 2794             vap->iv_csa_count == ic->ic_csa_count) {
 2795                 vap->iv_csa_count = 0;
 2796                 /*
 2797                  * Effect channel change before reconstructing the beacon
 2798                  * frame contents as many places reference ni_chan.
 2799                  */
 2800                 if (ic->ic_csa_newchan != NULL)
 2801                         ieee80211_csa_completeswitch(ic);
 2802                 /*
 2803                  * NB: ieee80211_beacon_construct clears all pending
 2804                  * updates in bo_flags so we don't need to explicitly
 2805                  * clear IEEE80211_BEACON_CSA.
 2806                  */
 2807                 ieee80211_beacon_construct(m,
 2808                     mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni);
 2809 
 2810                 /* XXX do WME aggressive mode processing? */
 2811                 IEEE80211_UNLOCK(ic);
 2812                 return 1;               /* just assume length changed */
 2813         }
 2814 
 2815         /* XXX faster to recalculate entirely or just changes? */
 2816         capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
 2817         *bo->bo_caps = htole16(capinfo);
 2818 
 2819         if (vap->iv_flags & IEEE80211_F_WME) {
 2820                 struct ieee80211_wme_state *wme = &ic->ic_wme;
 2821 
 2822                 /*
 2823                  * Check for agressive mode change.  When there is
 2824                  * significant high priority traffic in the BSS
 2825                  * throttle back BE traffic by using conservative
 2826                  * parameters.  Otherwise BE uses agressive params
 2827                  * to optimize performance of legacy/non-QoS traffic.
 2828                  */
 2829                 if (wme->wme_flags & WME_F_AGGRMODE) {
 2830                         if (wme->wme_hipri_traffic >
 2831                             wme->wme_hipri_switch_thresh) {
 2832                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
 2833                                     "%s: traffic %u, disable aggressive mode\n",
 2834                                     __func__, wme->wme_hipri_traffic);
 2835                                 wme->wme_flags &= ~WME_F_AGGRMODE;
 2836                                 ieee80211_wme_updateparams_locked(vap);
 2837                                 wme->wme_hipri_traffic =
 2838                                         wme->wme_hipri_switch_hysteresis;
 2839                         } else
 2840                                 wme->wme_hipri_traffic = 0;
 2841                 } else {
 2842                         if (wme->wme_hipri_traffic <=
 2843                             wme->wme_hipri_switch_thresh) {
 2844                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
 2845                                     "%s: traffic %u, enable aggressive mode\n",
 2846                                     __func__, wme->wme_hipri_traffic);
 2847                                 wme->wme_flags |= WME_F_AGGRMODE;
 2848                                 ieee80211_wme_updateparams_locked(vap);
 2849                                 wme->wme_hipri_traffic = 0;
 2850                         } else
 2851                                 wme->wme_hipri_traffic =
 2852                                         wme->wme_hipri_switch_hysteresis;
 2853                 }
 2854                 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
 2855                         (void) ieee80211_add_wme_param(bo->bo_wme, wme);
 2856                         clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
 2857                 }
 2858         }
 2859 
 2860         if (isset(bo->bo_flags,  IEEE80211_BEACON_HTINFO)) {
 2861                 ieee80211_ht_update_beacon(vap, bo);
 2862                 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
 2863         }
 2864 #ifdef IEEE80211_SUPPORT_TDMA
 2865         if (vap->iv_caps & IEEE80211_C_TDMA) {
 2866                 /*
 2867                  * NB: the beacon is potentially updated every TBTT.
 2868                  */
 2869                 ieee80211_tdma_update_beacon(vap, bo);
 2870         }
 2871 #endif
 2872 #ifdef IEEE80211_SUPPORT_MESH
 2873         if (vap->iv_opmode == IEEE80211_M_MBSS)
 2874                 ieee80211_mesh_update_beacon(vap, bo);
 2875 #endif
 2876 
 2877         if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2878             vap->iv_opmode == IEEE80211_M_MBSS) {       /* NB: no IBSS support*/
 2879                 struct ieee80211_tim_ie *tie =
 2880                         (struct ieee80211_tim_ie *) bo->bo_tim;
 2881                 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
 2882                         u_int timlen, timoff, i;
 2883                         /* 
 2884                          * ATIM/DTIM needs updating.  If it fits in the
 2885                          * current space allocated then just copy in the
 2886                          * new bits.  Otherwise we need to move any trailing
 2887                          * data to make room.  Note that we know there is
 2888                          * contiguous space because ieee80211_beacon_allocate
 2889                          * insures there is space in the mbuf to write a
 2890                          * maximal-size virtual bitmap (based on iv_max_aid).
 2891                          */
 2892                         /*
 2893                          * Calculate the bitmap size and offset, copy any
 2894                          * trailer out of the way, and then copy in the
 2895                          * new bitmap and update the information element.
 2896                          * Note that the tim bitmap must contain at least
 2897                          * one byte and any offset must be even.
 2898                          */
 2899                         if (vap->iv_ps_pending != 0) {
 2900                                 timoff = 128;           /* impossibly large */
 2901                                 for (i = 0; i < vap->iv_tim_len; i++)
 2902                                         if (vap->iv_tim_bitmap[i]) {
 2903                                                 timoff = i &~ 1;
 2904                                                 break;
 2905                                         }
 2906                                 KASSERT(timoff != 128, ("tim bitmap empty!"));
 2907                                 for (i = vap->iv_tim_len-1; i >= timoff; i--)
 2908                                         if (vap->iv_tim_bitmap[i])
 2909                                                 break;
 2910                                 timlen = 1 + (i - timoff);
 2911                         } else {
 2912                                 timoff = 0;
 2913                                 timlen = 1;
 2914                         }
 2915                         if (timlen != bo->bo_tim_len) {
 2916                                 /* copy up/down trailer */
 2917                                 int adjust = tie->tim_bitmap+timlen
 2918                                            - bo->bo_tim_trailer;
 2919                                 ovbcopy(bo->bo_tim_trailer,
 2920                                     bo->bo_tim_trailer+adjust,
 2921                                     bo->bo_tim_trailer_len);
 2922                                 bo->bo_tim_trailer += adjust;
 2923                                 bo->bo_erp += adjust;
 2924                                 bo->bo_htinfo += adjust;
 2925 #ifdef IEEE80211_SUPERG_SUPPORT
 2926                                 bo->bo_ath += adjust;
 2927 #endif
 2928 #ifdef IEEE80211_TDMA_SUPPORT
 2929                                 bo->bo_tdma += adjust;
 2930 #endif
 2931 #ifdef IEEE80211_MESH_SUPPORT
 2932                                 bo->bo_meshconf += adjust;
 2933 #endif
 2934                                 bo->bo_appie += adjust;
 2935                                 bo->bo_wme += adjust;
 2936                                 bo->bo_csa += adjust;
 2937                                 bo->bo_tim_len = timlen;
 2938 
 2939                                 /* update information element */
 2940                                 tie->tim_len = 3 + timlen;
 2941                                 tie->tim_bitctl = timoff;
 2942                                 len_changed = 1;
 2943                         }
 2944                         memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
 2945                                 bo->bo_tim_len);
 2946 
 2947                         clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
 2948 
 2949                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
 2950                                 "%s: TIM updated, pending %u, off %u, len %u\n",
 2951                                 __func__, vap->iv_ps_pending, timoff, timlen);
 2952                 }
 2953                 /* count down DTIM period */
 2954                 if (tie->tim_count == 0)
 2955                         tie->tim_count = tie->tim_period - 1;
 2956                 else
 2957                         tie->tim_count--;
 2958                 /* update state for buffered multicast frames on DTIM */
 2959                 if (mcast && tie->tim_count == 0)
 2960                         tie->tim_bitctl |= 1;
 2961                 else
 2962                         tie->tim_bitctl &= ~1;
 2963                 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
 2964                         struct ieee80211_csa_ie *csa =
 2965                             (struct ieee80211_csa_ie *) bo->bo_csa;
 2966 
 2967                         /*
 2968                          * Insert or update CSA ie.  If we're just starting
 2969                          * to count down to the channel switch then we need
 2970                          * to insert the CSA ie.  Otherwise we just need to
 2971                          * drop the count.  The actual change happens above
 2972                          * when the vap's count reaches the target count.
 2973                          */
 2974                         if (vap->iv_csa_count == 0) {
 2975                                 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
 2976                                 bo->bo_erp += sizeof(*csa);
 2977                                 bo->bo_htinfo += sizeof(*csa);
 2978                                 bo->bo_wme += sizeof(*csa);
 2979 #ifdef IEEE80211_SUPERG_SUPPORT
 2980                                 bo->bo_ath += sizeof(*csa);
 2981 #endif
 2982 #ifdef IEEE80211_TDMA_SUPPORT
 2983                                 bo->bo_tdma += sizeof(*csa);
 2984 #endif
 2985 #ifdef IEEE80211_MESH_SUPPORT
 2986                                 bo->bo_meshconf += sizeof(*csa);
 2987 #endif
 2988                                 bo->bo_appie += sizeof(*csa);
 2989                                 bo->bo_csa_trailer_len += sizeof(*csa);
 2990                                 bo->bo_tim_trailer_len += sizeof(*csa);
 2991                                 m->m_len += sizeof(*csa);
 2992                                 m->m_pkthdr.len += sizeof(*csa);
 2993 
 2994                                 ieee80211_add_csa(bo->bo_csa, vap);
 2995                         } else
 2996                                 csa->csa_count--;
 2997                         vap->iv_csa_count++;
 2998                         /* NB: don't clear IEEE80211_BEACON_CSA */
 2999                 }
 3000                 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
 3001                         /*
 3002                          * ERP element needs updating.
 3003                          */
 3004                         (void) ieee80211_add_erp(bo->bo_erp, ic);
 3005                         clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
 3006                 }
 3007 #ifdef IEEE80211_SUPPORT_SUPERG
 3008                 if (isset(bo->bo_flags,  IEEE80211_BEACON_ATH)) {
 3009                         ieee80211_add_athcaps(bo->bo_ath, ni);
 3010                         clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
 3011                 }
 3012 #endif
 3013         }
 3014         if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
 3015                 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
 3016                 int aielen;
 3017                 uint8_t *frm;
 3018 
 3019                 aielen = 0;
 3020                 if (aie != NULL)
 3021                         aielen += aie->ie_len;
 3022                 if (aielen != bo->bo_appie_len) {
 3023                         /* copy up/down trailer */
 3024                         int adjust = aielen - bo->bo_appie_len;
 3025                         ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
 3026                                 bo->bo_tim_trailer_len);
 3027                         bo->bo_tim_trailer += adjust;
 3028                         bo->bo_appie += adjust;
 3029                         bo->bo_appie_len = aielen;
 3030 
 3031                         len_changed = 1;
 3032                 }
 3033                 frm = bo->bo_appie;
 3034                 if (aie != NULL)
 3035                         frm  = add_appie(frm, aie);
 3036                 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
 3037         }
 3038         IEEE80211_UNLOCK(ic);
 3039 
 3040         return len_changed;
 3041 }

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