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/11.0/sys/net80211/ieee80211_output.c 301731 2016-06-09 13:42:18Z avos $");
   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/kernel.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mbuf.h>   
   39 #include <sys/endian.h>
   40 
   41 #include <sys/socket.h>
   42  
   43 #include <net/bpf.h>
   44 #include <net/ethernet.h>
   45 #include <net/if.h>
   46 #include <net/if_var.h>
   47 #include <net/if_llc.h>
   48 #include <net/if_media.h>
   49 #include <net/if_vlan_var.h>
   50 
   51 #include <net80211/ieee80211_var.h>
   52 #include <net80211/ieee80211_regdomain.h>
   53 #ifdef IEEE80211_SUPPORT_SUPERG
   54 #include <net80211/ieee80211_superg.h>
   55 #endif
   56 #ifdef IEEE80211_SUPPORT_TDMA
   57 #include <net80211/ieee80211_tdma.h>
   58 #endif
   59 #include <net80211/ieee80211_wds.h>
   60 #include <net80211/ieee80211_mesh.h>
   61 
   62 #if defined(INET) || defined(INET6)
   63 #include <netinet/in.h> 
   64 #endif
   65 
   66 #ifdef INET
   67 #include <netinet/if_ether.h>
   68 #include <netinet/in_systm.h>
   69 #include <netinet/ip.h>
   70 #endif
   71 #ifdef INET6
   72 #include <netinet/ip6.h>
   73 #endif
   74 
   75 #include <security/mac/mac_framework.h>
   76 
   77 #define ETHER_HEADER_COPY(dst, src) \
   78         memcpy(dst, src, sizeof(struct ether_header))
   79 
   80 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *,
   81         u_int hdrsize, u_int ciphdrsize, u_int mtu);
   82 static  void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int);
   83 
   84 #ifdef IEEE80211_DEBUG
   85 /*
   86  * Decide if an outbound management frame should be
   87  * printed when debugging is enabled.  This filters some
   88  * of the less interesting frames that come frequently
   89  * (e.g. beacons).
   90  */
   91 static __inline int
   92 doprint(struct ieee80211vap *vap, int subtype)
   93 {
   94         switch (subtype) {
   95         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
   96                 return (vap->iv_opmode == IEEE80211_M_IBSS);
   97         }
   98         return 1;
   99 }
  100 #endif
  101 
  102 /*
  103  * Transmit a frame to the given destination on the given VAP.
  104  *
  105  * It's up to the caller to figure out the details of who this
  106  * is going to and resolving the node.
  107  *
  108  * This routine takes care of queuing it for power save,
  109  * A-MPDU state stuff, fast-frames state stuff, encapsulation
  110  * if required, then passing it up to the driver layer.
  111  *
  112  * This routine (for now) consumes the mbuf and frees the node
  113  * reference; it ideally will return a TX status which reflects
  114  * whether the mbuf was consumed or not, so the caller can
  115  * free the mbuf (if appropriate) and the node reference (again,
  116  * if appropriate.)
  117  */
  118 int
  119 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m,
  120     struct ieee80211_node *ni)
  121 {
  122         struct ieee80211com *ic = vap->iv_ic;
  123         struct ifnet *ifp = vap->iv_ifp;
  124 #ifdef IEEE80211_SUPPORT_SUPERG
  125         int mcast;
  126 #endif
  127 
  128         if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
  129             (m->m_flags & M_PWR_SAV) == 0) {
  130                 /*
  131                  * Station in power save mode; pass the frame
  132                  * to the 802.11 layer and continue.  We'll get
  133                  * the frame back when the time is right.
  134                  * XXX lose WDS vap linkage?
  135                  */
  136                 if (ieee80211_pwrsave(ni, m) != 0)
  137                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  138                 ieee80211_free_node(ni);
  139 
  140                 /*
  141                  * We queued it fine, so tell the upper layer
  142                  * that we consumed it.
  143                  */
  144                 return (0);
  145         }
  146         /* calculate priority so drivers can find the tx queue */
  147         if (ieee80211_classify(ni, m)) {
  148                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
  149                     ni->ni_macaddr, NULL,
  150                     "%s", "classification failure");
  151                 vap->iv_stats.is_tx_classify++;
  152                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  153                 m_freem(m);
  154                 ieee80211_free_node(ni);
  155 
  156                 /* XXX better status? */
  157                 return (0);
  158         }
  159         /*
  160          * Stash the node pointer.  Note that we do this after
  161          * any call to ieee80211_dwds_mcast because that code
  162          * uses any existing value for rcvif to identify the
  163          * interface it (might have been) received on.
  164          */
  165         m->m_pkthdr.rcvif = (void *)ni;
  166 #ifdef IEEE80211_SUPPORT_SUPERG
  167         mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1: 0;
  168 #endif
  169 
  170         BPF_MTAP(ifp, m);               /* 802.3 tx */
  171 
  172         /*
  173          * Check if A-MPDU tx aggregation is setup or if we
  174          * should try to enable it.  The sta must be associated
  175          * with HT and A-MPDU enabled for use.  When the policy
  176          * routine decides we should enable A-MPDU we issue an
  177          * ADDBA request and wait for a reply.  The frame being
  178          * encapsulated will go out w/o using A-MPDU, or possibly
  179          * it might be collected by the driver and held/retransmit.
  180          * The default ic_ampdu_enable routine handles staggering
  181          * ADDBA requests in case the receiver NAK's us or we are
  182          * otherwise unable to establish a BA stream.
  183          */
  184         if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) &&
  185             (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX)) {
  186                 if ((m->m_flags & M_EAPOL) == 0) {
  187                         int tid = WME_AC_TO_TID(M_WME_GETAC(m));
  188                         struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid];
  189 
  190                         ieee80211_txampdu_count_packet(tap);
  191                         if (IEEE80211_AMPDU_RUNNING(tap)) {
  192                                 /*
  193                                  * Operational, mark frame for aggregation.
  194                                  *
  195                                  * XXX do tx aggregation here
  196                                  */
  197                                 m->m_flags |= M_AMPDU_MPDU;
  198                         } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
  199                             ic->ic_ampdu_enable(ni, tap)) {
  200                                 /*
  201                                  * Not negotiated yet, request service.
  202                                  */
  203                                 ieee80211_ampdu_request(ni, tap);
  204                                 /* XXX hold frame for reply? */
  205                         }
  206                 }
  207         }
  208 
  209 #ifdef IEEE80211_SUPPORT_SUPERG
  210         /*
  211          * Check for AMSDU/FF; queue for aggregation
  212          *
  213          * Note: we don't bother trying to do fast frames or
  214          * A-MSDU encapsulation for 802.3 drivers.  Now, we
  215          * likely could do it for FF (because it's a magic
  216          * atheros tunnel LLC type) but I don't think we're going
  217          * to really need to.  For A-MSDU we'd have to set the
  218          * A-MSDU QoS bit in the wifi header, so we just plain
  219          * can't do it.
  220          *
  221          * Strictly speaking, we could actually /do/ A-MSDU / FF
  222          * with A-MPDU together which for certain circumstances
  223          * is beneficial (eg A-MSDU of TCK ACKs.)  However,
  224          * I'll ignore that for now so existing behaviour is maintained.
  225          * Later on it would be good to make "amsdu + ampdu" configurable.
  226          */
  227         else if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
  228                 if ((! mcast) && ieee80211_amsdu_tx_ok(ni)) {
  229                         m = ieee80211_amsdu_check(ni, m);
  230                         if (m == NULL) {
  231                                 /* NB: any ni ref held on stageq */
  232                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  233                                     "%s: amsdu_check queued frame\n",
  234                                     __func__);
  235                                 return (0);
  236                         }
  237                 } else if ((! mcast) && IEEE80211_ATH_CAP(vap, ni,
  238                     IEEE80211_NODE_FF)) {
  239                         m = ieee80211_ff_check(ni, m);
  240                         if (m == NULL) {
  241                                 /* NB: any ni ref held on stageq */
  242                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  243                                     "%s: ff_check queued frame\n",
  244                                     __func__);
  245                                 return (0);
  246                         }
  247                 }
  248         }
  249 #endif /* IEEE80211_SUPPORT_SUPERG */
  250 
  251         /*
  252          * Grab the TX lock - serialise the TX process from this
  253          * point (where TX state is being checked/modified)
  254          * through to driver queue.
  255          */
  256         IEEE80211_TX_LOCK(ic);
  257 
  258         /*
  259          * XXX make the encap and transmit code a separate function
  260          * so things like the FF (and later A-MSDU) path can just call
  261          * it for flushed frames.
  262          */
  263         if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
  264                 /*
  265                  * Encapsulate the packet in prep for transmission.
  266                  */
  267                 m = ieee80211_encap(vap, ni, m);
  268                 if (m == NULL) {
  269                         /* NB: stat+msg handled in ieee80211_encap */
  270                         IEEE80211_TX_UNLOCK(ic);
  271                         ieee80211_free_node(ni);
  272                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  273                         return (ENOBUFS);
  274                 }
  275         }
  276         (void) ieee80211_parent_xmitpkt(ic, m);
  277 
  278         /*
  279          * Unlock at this point - no need to hold it across
  280          * ieee80211_free_node() (ie, the comlock)
  281          */
  282         IEEE80211_TX_UNLOCK(ic);
  283         ic->ic_lastdata = ticks;
  284 
  285         return (0);
  286 }
  287 
  288 
  289 
  290 /*
  291  * Send the given mbuf through the given vap.
  292  *
  293  * This consumes the mbuf regardless of whether the transmit
  294  * was successful or not.
  295  *
  296  * This does none of the initial checks that ieee80211_start()
  297  * does (eg CAC timeout, interface wakeup) - the caller must
  298  * do this first.
  299  */
  300 static int
  301 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m)
  302 {
  303 #define IS_DWDS(vap) \
  304         (vap->iv_opmode == IEEE80211_M_WDS && \
  305          (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0)
  306         struct ieee80211com *ic = vap->iv_ic;
  307         struct ifnet *ifp = vap->iv_ifp;
  308         struct ieee80211_node *ni;
  309         struct ether_header *eh;
  310 
  311         /*
  312          * Cancel any background scan.
  313          */
  314         if (ic->ic_flags & IEEE80211_F_SCAN)
  315                 ieee80211_cancel_anyscan(vap);
  316         /* 
  317          * Find the node for the destination so we can do
  318          * things like power save and fast frames aggregation.
  319          *
  320          * NB: past this point various code assumes the first
  321          *     mbuf has the 802.3 header present (and contiguous).
  322          */
  323         ni = NULL;
  324         if (m->m_len < sizeof(struct ether_header) &&
  325            (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
  326                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  327                     "discard frame, %s\n", "m_pullup failed");
  328                 vap->iv_stats.is_tx_nobuf++;    /* XXX */
  329                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  330                 return (ENOBUFS);
  331         }
  332         eh = mtod(m, struct ether_header *);
  333         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
  334                 if (IS_DWDS(vap)) {
  335                         /*
  336                          * Only unicast frames from the above go out
  337                          * DWDS vaps; multicast frames are handled by
  338                          * dispatching the frame as it comes through
  339                          * the AP vap (see below).
  340                          */
  341                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS,
  342                             eh->ether_dhost, "mcast", "%s", "on DWDS");
  343                         vap->iv_stats.is_dwds_mcast++;
  344                         m_freem(m);
  345                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  346                         /* XXX better status? */
  347                         return (ENOBUFS);
  348                 }
  349                 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
  350                         /*
  351                          * Spam DWDS vap's w/ multicast traffic.
  352                          */
  353                         /* XXX only if dwds in use? */
  354                         ieee80211_dwds_mcast(vap, m);
  355                 }
  356         }
  357 #ifdef IEEE80211_SUPPORT_MESH
  358         if (vap->iv_opmode != IEEE80211_M_MBSS) {
  359 #endif
  360                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
  361                 if (ni == NULL) {
  362                         /* NB: ieee80211_find_txnode does stat+msg */
  363                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  364                         m_freem(m);
  365                         /* XXX better status? */
  366                         return (ENOBUFS);
  367                 }
  368                 if (ni->ni_associd == 0 &&
  369                     (ni->ni_flags & IEEE80211_NODE_ASSOCID)) {
  370                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
  371                             eh->ether_dhost, NULL,
  372                             "sta not associated (type 0x%04x)",
  373                             htons(eh->ether_type));
  374                         vap->iv_stats.is_tx_notassoc++;
  375                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  376                         m_freem(m);
  377                         ieee80211_free_node(ni);
  378                         /* XXX better status? */
  379                         return (ENOBUFS);
  380                 }
  381 #ifdef IEEE80211_SUPPORT_MESH
  382         } else {
  383                 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) {
  384                         /*
  385                          * Proxy station only if configured.
  386                          */
  387                         if (!ieee80211_mesh_isproxyena(vap)) {
  388                                 IEEE80211_DISCARD_MAC(vap,
  389                                     IEEE80211_MSG_OUTPUT |
  390                                     IEEE80211_MSG_MESH,
  391                                     eh->ether_dhost, NULL,
  392                                     "%s", "proxy not enabled");
  393                                 vap->iv_stats.is_mesh_notproxy++;
  394                                 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  395                                 m_freem(m);
  396                                 /* XXX better status? */
  397                                 return (ENOBUFS);
  398                         }
  399                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  400                             "forward frame from DS SA(%6D), DA(%6D)\n",
  401                             eh->ether_shost, ":",
  402                             eh->ether_dhost, ":");
  403                         ieee80211_mesh_proxy_check(vap, eh->ether_shost);
  404                 }
  405                 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m);
  406                 if (ni == NULL) {
  407                         /*
  408                          * NB: ieee80211_mesh_discover holds/disposes
  409                          * frame (e.g. queueing on path discovery).
  410                          */
  411                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  412                         /* XXX better status? */
  413                         return (ENOBUFS);
  414                 }
  415         }
  416 #endif
  417 
  418         /*
  419          * We've resolved the sender, so attempt to transmit it.
  420          */
  421 
  422         if (vap->iv_state == IEEE80211_S_SLEEP) {
  423                 /*
  424                  * In power save; queue frame and then  wakeup device
  425                  * for transmit.
  426                  */
  427                 ic->ic_lastdata = ticks;
  428                 if (ieee80211_pwrsave(ni, m) != 0)
  429                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  430                 ieee80211_free_node(ni);
  431                 ieee80211_new_state(vap, IEEE80211_S_RUN, 0);
  432                 return (0);
  433         }
  434 
  435         if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0)
  436                 return (ENOBUFS);
  437         return (0);
  438 #undef  IS_DWDS
  439 }
  440 
  441 /*
  442  * Start method for vap's.  All packets from the stack come
  443  * through here.  We handle common processing of the packets
  444  * before dispatching them to the underlying device.
  445  *
  446  * if_transmit() requires that the mbuf be consumed by this call
  447  * regardless of the return condition.
  448  */
  449 int
  450 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m)
  451 {
  452         struct ieee80211vap *vap = ifp->if_softc;
  453         struct ieee80211com *ic = vap->iv_ic;
  454 
  455         /*
  456          * No data frames go out unless we're running.
  457          * Note in particular this covers CAC and CSA
  458          * states (though maybe we should check muting
  459          * for CSA).
  460          */
  461         if (vap->iv_state != IEEE80211_S_RUN &&
  462             vap->iv_state != IEEE80211_S_SLEEP) {
  463                 IEEE80211_LOCK(ic);
  464                 /* re-check under the com lock to avoid races */
  465                 if (vap->iv_state != IEEE80211_S_RUN &&
  466                     vap->iv_state != IEEE80211_S_SLEEP) {
  467                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
  468                             "%s: ignore queue, in %s state\n",
  469                             __func__, ieee80211_state_name[vap->iv_state]);
  470                         vap->iv_stats.is_tx_badstate++;
  471                         IEEE80211_UNLOCK(ic);
  472                         ifp->if_drv_flags |= IFF_DRV_OACTIVE;
  473                         m_freem(m);
  474                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  475                         return (ENETDOWN);
  476                 }
  477                 IEEE80211_UNLOCK(ic);
  478         }
  479 
  480         /*
  481          * Sanitize mbuf flags for net80211 use.  We cannot
  482          * clear M_PWR_SAV or M_MORE_DATA because these may
  483          * be set for frames that are re-submitted from the
  484          * power save queue.
  485          *
  486          * NB: This must be done before ieee80211_classify as
  487          *     it marks EAPOL in frames with M_EAPOL.
  488          */
  489         m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA);
  490 
  491         /*
  492          * Bump to the packet transmission path.
  493          * The mbuf will be consumed here.
  494          */
  495         return (ieee80211_start_pkt(vap, m));
  496 }
  497 
  498 void
  499 ieee80211_vap_qflush(struct ifnet *ifp)
  500 {
  501 
  502         /* Empty for now */
  503 }
  504 
  505 /*
  506  * 802.11 raw output routine.
  507  *
  508  * XXX TODO: this (and other send routines) should correctly
  509  * XXX keep the pwr mgmt bit set if it decides to call into the
  510  * XXX driver to send a frame whilst the state is SLEEP.
  511  *
  512  * Otherwise the peer may decide that we're awake and flood us
  513  * with traffic we are still too asleep to receive!
  514  */
  515 int
  516 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni,
  517     struct mbuf *m, const struct ieee80211_bpf_params *params)
  518 {
  519         struct ieee80211com *ic = vap->iv_ic;
  520         int error;
  521 
  522         /*
  523          * Set node - the caller has taken a reference, so ensure
  524          * that the mbuf has the same node value that
  525          * it would if it were going via the normal path.
  526          */
  527         m->m_pkthdr.rcvif = (void *)ni;
  528 
  529         /*
  530          * Attempt to add bpf transmit parameters.
  531          *
  532          * For now it's ok to fail; the raw_xmit api still takes
  533          * them as an option.
  534          *
  535          * Later on when ic_raw_xmit() has params removed,
  536          * they'll have to be added - so fail the transmit if
  537          * they can't be.
  538          */
  539         if (params)
  540                 (void) ieee80211_add_xmit_params(m, params);
  541 
  542         error = ic->ic_raw_xmit(ni, m, params);
  543         if (error) {
  544                 if_inc_counter(vap->iv_ifp, IFCOUNTER_OERRORS, 1);
  545                 ieee80211_free_node(ni);
  546         }
  547         return (error);
  548 }
  549 
  550 /*
  551  * 802.11 output routine. This is (currently) used only to
  552  * connect bpf write calls to the 802.11 layer for injecting
  553  * raw 802.11 frames.
  554  */
  555 int
  556 ieee80211_output(struct ifnet *ifp, struct mbuf *m,
  557         const struct sockaddr *dst, struct route *ro)
  558 {
  559 #define senderr(e) do { error = (e); goto bad;} while (0)
  560         struct ieee80211_node *ni = NULL;
  561         struct ieee80211vap *vap;
  562         struct ieee80211_frame *wh;
  563         struct ieee80211com *ic = NULL;
  564         int error;
  565         int ret;
  566 
  567         if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
  568                 /*
  569                  * Short-circuit requests if the vap is marked OACTIVE
  570                  * as this can happen because a packet came down through
  571                  * ieee80211_start before the vap entered RUN state in
  572                  * which case it's ok to just drop the frame.  This
  573                  * should not be necessary but callers of if_output don't
  574                  * check OACTIVE.
  575                  */
  576                 senderr(ENETDOWN);
  577         }
  578         vap = ifp->if_softc;
  579         ic = vap->iv_ic;
  580         /*
  581          * Hand to the 802.3 code if not tagged as
  582          * a raw 802.11 frame.
  583          */
  584         if (dst->sa_family != AF_IEEE80211)
  585                 return vap->iv_output(ifp, m, dst, ro);
  586 #ifdef MAC
  587         error = mac_ifnet_check_transmit(ifp, m);
  588         if (error)
  589                 senderr(error);
  590 #endif
  591         if (ifp->if_flags & IFF_MONITOR)
  592                 senderr(ENETDOWN);
  593         if (!IFNET_IS_UP_RUNNING(ifp))
  594                 senderr(ENETDOWN);
  595         if (vap->iv_state == IEEE80211_S_CAC) {
  596                 IEEE80211_DPRINTF(vap,
  597                     IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
  598                     "block %s frame in CAC state\n", "raw data");
  599                 vap->iv_stats.is_tx_badstate++;
  600                 senderr(EIO);           /* XXX */
  601         } else if (vap->iv_state == IEEE80211_S_SCAN)
  602                 senderr(EIO);
  603         /* XXX bypass bridge, pfil, carp, etc. */
  604 
  605         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
  606                 senderr(EIO);   /* XXX */
  607         wh = mtod(m, struct ieee80211_frame *);
  608         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
  609             IEEE80211_FC0_VERSION_0)
  610                 senderr(EIO);   /* XXX */
  611         if (m->m_pkthdr.len < ieee80211_anyhdrsize(wh))
  612                 senderr(EIO);   /* XXX */
  613 
  614         /* locate destination node */
  615         switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
  616         case IEEE80211_FC1_DIR_NODS:
  617         case IEEE80211_FC1_DIR_FROMDS:
  618                 ni = ieee80211_find_txnode(vap, wh->i_addr1);
  619                 break;
  620         case IEEE80211_FC1_DIR_TODS:
  621         case IEEE80211_FC1_DIR_DSTODS:
  622                 ni = ieee80211_find_txnode(vap, wh->i_addr3);
  623                 break;
  624         default:
  625                 senderr(EIO);   /* XXX */
  626         }
  627         if (ni == NULL) {
  628                 /*
  629                  * Permit packets w/ bpf params through regardless
  630                  * (see below about sa_len).
  631                  */
  632                 if (dst->sa_len == 0)
  633                         senderr(EHOSTUNREACH);
  634                 ni = ieee80211_ref_node(vap->iv_bss);
  635         }
  636 
  637         /*
  638          * Sanitize mbuf for net80211 flags leaked from above.
  639          *
  640          * NB: This must be done before ieee80211_classify as
  641          *     it marks EAPOL in frames with M_EAPOL.
  642          */
  643         m->m_flags &= ~M_80211_TX;
  644 
  645         /* calculate priority so drivers can find the tx queue */
  646         /* XXX assumes an 802.3 frame */
  647         if (ieee80211_classify(ni, m))
  648                 senderr(EIO);           /* XXX */
  649 
  650         IEEE80211_NODE_STAT(ni, tx_data);
  651         if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
  652                 IEEE80211_NODE_STAT(ni, tx_mcast);
  653                 m->m_flags |= M_MCAST;
  654         } else
  655                 IEEE80211_NODE_STAT(ni, tx_ucast);
  656         /* NB: ieee80211_encap does not include 802.11 header */
  657         IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
  658 
  659         IEEE80211_TX_LOCK(ic);
  660 
  661         /*
  662          * NB: DLT_IEEE802_11_RADIO identifies the parameters are
  663          * present by setting the sa_len field of the sockaddr (yes,
  664          * this is a hack).
  665          * NB: we assume sa_data is suitably aligned to cast.
  666          */
  667         ret = ieee80211_raw_output(vap, ni, m,
  668             (const struct ieee80211_bpf_params *)(dst->sa_len ?
  669                 dst->sa_data : NULL));
  670         IEEE80211_TX_UNLOCK(ic);
  671         return (ret);
  672 bad:
  673         if (m != NULL)
  674                 m_freem(m);
  675         if (ni != NULL)
  676                 ieee80211_free_node(ni);
  677         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
  678         return error;
  679 #undef senderr
  680 }
  681 
  682 /*
  683  * Set the direction field and address fields of an outgoing
  684  * frame.  Note this should be called early on in constructing
  685  * a frame as it sets i_fc[1]; other bits can then be or'd in.
  686  */
  687 void
  688 ieee80211_send_setup(
  689         struct ieee80211_node *ni,
  690         struct mbuf *m,
  691         int type, int tid,
  692         const uint8_t sa[IEEE80211_ADDR_LEN],
  693         const uint8_t da[IEEE80211_ADDR_LEN],
  694         const uint8_t bssid[IEEE80211_ADDR_LEN])
  695 {
  696 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
  697         struct ieee80211vap *vap = ni->ni_vap;
  698         struct ieee80211_tx_ampdu *tap;
  699         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
  700         ieee80211_seq seqno;
  701 
  702         IEEE80211_TX_LOCK_ASSERT(ni->ni_ic);
  703 
  704         wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
  705         if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
  706                 switch (vap->iv_opmode) {
  707                 case IEEE80211_M_STA:
  708                         wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
  709                         IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
  710                         IEEE80211_ADDR_COPY(wh->i_addr2, sa);
  711                         IEEE80211_ADDR_COPY(wh->i_addr3, da);
  712                         break;
  713                 case IEEE80211_M_IBSS:
  714                 case IEEE80211_M_AHDEMO:
  715                         wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
  716                         IEEE80211_ADDR_COPY(wh->i_addr1, da);
  717                         IEEE80211_ADDR_COPY(wh->i_addr2, sa);
  718                         IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
  719                         break;
  720                 case IEEE80211_M_HOSTAP:
  721                         wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
  722                         IEEE80211_ADDR_COPY(wh->i_addr1, da);
  723                         IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
  724                         IEEE80211_ADDR_COPY(wh->i_addr3, sa);
  725                         break;
  726                 case IEEE80211_M_WDS:
  727                         wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
  728                         IEEE80211_ADDR_COPY(wh->i_addr1, da);
  729                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
  730                         IEEE80211_ADDR_COPY(wh->i_addr3, da);
  731                         IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
  732                         break;
  733                 case IEEE80211_M_MBSS:
  734 #ifdef IEEE80211_SUPPORT_MESH
  735                         if (IEEE80211_IS_MULTICAST(da)) {
  736                                 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
  737                                 /* XXX next hop */
  738                                 IEEE80211_ADDR_COPY(wh->i_addr1, da);
  739                                 IEEE80211_ADDR_COPY(wh->i_addr2,
  740                                     vap->iv_myaddr);
  741                         } else {
  742                                 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
  743                                 IEEE80211_ADDR_COPY(wh->i_addr1, da);
  744                                 IEEE80211_ADDR_COPY(wh->i_addr2,
  745                                     vap->iv_myaddr);
  746                                 IEEE80211_ADDR_COPY(wh->i_addr3, da);
  747                                 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
  748                         }
  749 #endif
  750                         break;
  751                 case IEEE80211_M_MONITOR:       /* NB: to quiet compiler */
  752                         break;
  753                 }
  754         } else {
  755                 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
  756                 IEEE80211_ADDR_COPY(wh->i_addr1, da);
  757                 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
  758 #ifdef IEEE80211_SUPPORT_MESH
  759                 if (vap->iv_opmode == IEEE80211_M_MBSS)
  760                         IEEE80211_ADDR_COPY(wh->i_addr3, sa);
  761                 else
  762 #endif
  763                         IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
  764         }
  765         *(uint16_t *)&wh->i_dur[0] = 0;
  766 
  767         tap = &ni->ni_tx_ampdu[tid];
  768         if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap))
  769                 m->m_flags |= M_AMPDU_MPDU;
  770         else {
  771                 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK,
  772                                       type & IEEE80211_FC0_SUBTYPE_MASK))
  773                         seqno = ni->ni_txseqs[tid]++;
  774                 else
  775                         seqno = 0;
  776 
  777                 *(uint16_t *)&wh->i_seq[0] =
  778                     htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
  779                 M_SEQNO_SET(m, seqno);
  780         }
  781 
  782         if (IEEE80211_IS_MULTICAST(wh->i_addr1))
  783                 m->m_flags |= M_MCAST;
  784 #undef WH4
  785 }
  786 
  787 /*
  788  * Send a management frame to the specified node.  The node pointer
  789  * must have a reference as the pointer will be passed to the driver
  790  * and potentially held for a long time.  If the frame is successfully
  791  * dispatched to the driver, then it is responsible for freeing the
  792  * reference (and potentially free'ing up any associated storage);
  793  * otherwise deal with reclaiming any reference (on error).
  794  */
  795 int
  796 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
  797         struct ieee80211_bpf_params *params)
  798 {
  799         struct ieee80211vap *vap = ni->ni_vap;
  800         struct ieee80211com *ic = ni->ni_ic;
  801         struct ieee80211_frame *wh;
  802         int ret;
  803 
  804         KASSERT(ni != NULL, ("null node"));
  805 
  806         if (vap->iv_state == IEEE80211_S_CAC) {
  807                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
  808                     ni, "block %s frame in CAC state",
  809                         ieee80211_mgt_subtype_name(type));
  810                 vap->iv_stats.is_tx_badstate++;
  811                 ieee80211_free_node(ni);
  812                 m_freem(m);
  813                 return EIO;             /* XXX */
  814         }
  815 
  816         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
  817         if (m == NULL) {
  818                 ieee80211_free_node(ni);
  819                 return ENOMEM;
  820         }
  821 
  822         IEEE80211_TX_LOCK(ic);
  823 
  824         wh = mtod(m, struct ieee80211_frame *);
  825         ieee80211_send_setup(ni, m,
  826              IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
  827              vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
  828         if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
  829                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
  830                     "encrypting frame (%s)", __func__);
  831                 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
  832         }
  833         m->m_flags |= M_ENCAP;          /* mark encapsulated */
  834 
  835         KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
  836         M_WME_SETAC(m, params->ibp_pri);
  837 
  838 #ifdef IEEE80211_DEBUG
  839         /* avoid printing too many frames */
  840         if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
  841             ieee80211_msg_dumppkts(vap)) {
  842                 printf("[%s] send %s on channel %u\n",
  843                     ether_sprintf(wh->i_addr1),
  844                     ieee80211_mgt_subtype_name(type),
  845                     ieee80211_chan2ieee(ic, ic->ic_curchan));
  846         }
  847 #endif
  848         IEEE80211_NODE_STAT(ni, tx_mgmt);
  849 
  850         ret = ieee80211_raw_output(vap, ni, m, params);
  851         IEEE80211_TX_UNLOCK(ic);
  852         return (ret);
  853 }
  854 
  855 static void
  856 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg,
  857     int status)
  858 {
  859         struct ieee80211vap *vap = ni->ni_vap;
  860 
  861         wakeup(vap);
  862 }
  863 
  864 /*
  865  * Send a null data frame to the specified node.  If the station
  866  * is setup for QoS then a QoS Null Data frame is constructed.
  867  * If this is a WDS station then a 4-address frame is constructed.
  868  *
  869  * NB: the caller is assumed to have setup a node reference
  870  *     for use; this is necessary to deal with a race condition
  871  *     when probing for inactive stations.  Like ieee80211_mgmt_output
  872  *     we must cleanup any node reference on error;  however we
  873  *     can safely just unref it as we know it will never be the
  874  *     last reference to the node.
  875  */
  876 int
  877 ieee80211_send_nulldata(struct ieee80211_node *ni)
  878 {
  879         struct ieee80211vap *vap = ni->ni_vap;
  880         struct ieee80211com *ic = ni->ni_ic;
  881         struct mbuf *m;
  882         struct ieee80211_frame *wh;
  883         int hdrlen;
  884         uint8_t *frm;
  885         int ret;
  886 
  887         if (vap->iv_state == IEEE80211_S_CAC) {
  888                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
  889                     ni, "block %s frame in CAC state", "null data");
  890                 ieee80211_unref_node(&ni);
  891                 vap->iv_stats.is_tx_badstate++;
  892                 return EIO;             /* XXX */
  893         }
  894 
  895         if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
  896                 hdrlen = sizeof(struct ieee80211_qosframe);
  897         else
  898                 hdrlen = sizeof(struct ieee80211_frame);
  899         /* NB: only WDS vap's get 4-address frames */
  900         if (vap->iv_opmode == IEEE80211_M_WDS)
  901                 hdrlen += IEEE80211_ADDR_LEN;
  902         if (ic->ic_flags & IEEE80211_F_DATAPAD)
  903                 hdrlen = roundup(hdrlen, sizeof(uint32_t));
  904 
  905         m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
  906         if (m == NULL) {
  907                 /* XXX debug msg */
  908                 ieee80211_unref_node(&ni);
  909                 vap->iv_stats.is_tx_nobuf++;
  910                 return ENOMEM;
  911         }
  912         KASSERT(M_LEADINGSPACE(m) >= hdrlen,
  913             ("leading space %zd", M_LEADINGSPACE(m)));
  914         M_PREPEND(m, hdrlen, M_NOWAIT);
  915         if (m == NULL) {
  916                 /* NB: cannot happen */
  917                 ieee80211_free_node(ni);
  918                 return ENOMEM;
  919         }
  920 
  921         IEEE80211_TX_LOCK(ic);
  922 
  923         wh = mtod(m, struct ieee80211_frame *);         /* NB: a little lie */
  924         if (ni->ni_flags & IEEE80211_NODE_QOS) {
  925                 const int tid = WME_AC_TO_TID(WME_AC_BE);
  926                 uint8_t *qos;
  927 
  928                 ieee80211_send_setup(ni, m,
  929                     IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
  930                     tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
  931 
  932                 if (vap->iv_opmode == IEEE80211_M_WDS)
  933                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
  934                 else
  935                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
  936                 qos[0] = tid & IEEE80211_QOS_TID;
  937                 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
  938                         qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
  939                 qos[1] = 0;
  940         } else {
  941                 ieee80211_send_setup(ni, m,
  942                     IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
  943                     IEEE80211_NONQOS_TID,
  944                     vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
  945         }
  946         if (vap->iv_opmode != IEEE80211_M_WDS) {
  947                 /* NB: power management bit is never sent by an AP */
  948                 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
  949                     vap->iv_opmode != IEEE80211_M_HOSTAP)
  950                         wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
  951         }
  952         if ((ic->ic_flags & IEEE80211_F_SCAN) &&
  953             (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) {
  954                 ieee80211_add_callback(m, ieee80211_nulldata_transmitted,
  955                     NULL);
  956         }
  957         m->m_len = m->m_pkthdr.len = hdrlen;
  958         m->m_flags |= M_ENCAP;          /* mark encapsulated */
  959 
  960         M_WME_SETAC(m, WME_AC_BE);
  961 
  962         IEEE80211_NODE_STAT(ni, tx_data);
  963 
  964         IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
  965             "send %snull data frame on channel %u, pwr mgt %s",
  966             ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
  967             ieee80211_chan2ieee(ic, ic->ic_curchan),
  968             wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
  969 
  970         ret = ieee80211_raw_output(vap, ni, m, NULL);
  971         IEEE80211_TX_UNLOCK(ic);
  972         return (ret);
  973 }
  974 
  975 /* 
  976  * Assign priority to a frame based on any vlan tag assigned
  977  * to the station and/or any Diffserv setting in an IP header.
  978  * Finally, if an ACM policy is setup (in station mode) it's
  979  * applied.
  980  */
  981 int
  982 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
  983 {
  984         const struct ether_header *eh = mtod(m, struct ether_header *);
  985         int v_wme_ac, d_wme_ac, ac;
  986 
  987         /*
  988          * Always promote PAE/EAPOL frames to high priority.
  989          */
  990         if (eh->ether_type == htons(ETHERTYPE_PAE)) {
  991                 /* NB: mark so others don't need to check header */
  992                 m->m_flags |= M_EAPOL;
  993                 ac = WME_AC_VO;
  994                 goto done;
  995         }
  996         /*
  997          * Non-qos traffic goes to BE.
  998          */
  999         if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
 1000                 ac = WME_AC_BE;
 1001                 goto done;
 1002         }
 1003 
 1004         /* 
 1005          * If node has a vlan tag then all traffic
 1006          * to it must have a matching tag.
 1007          */
 1008         v_wme_ac = 0;
 1009         if (ni->ni_vlan != 0) {
 1010                  if ((m->m_flags & M_VLANTAG) == 0) {
 1011                         IEEE80211_NODE_STAT(ni, tx_novlantag);
 1012                         return 1;
 1013                 }
 1014                 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
 1015                     EVL_VLANOFTAG(ni->ni_vlan)) {
 1016                         IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
 1017                         return 1;
 1018                 }
 1019                 /* map vlan priority to AC */
 1020                 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
 1021         }
 1022 
 1023         /* XXX m_copydata may be too slow for fast path */
 1024 #ifdef INET
 1025         if (eh->ether_type == htons(ETHERTYPE_IP)) {
 1026                 uint8_t tos;
 1027                 /*
 1028                  * IP frame, map the DSCP bits from the TOS field.
 1029                  */
 1030                 /* NB: ip header may not be in first mbuf */
 1031                 m_copydata(m, sizeof(struct ether_header) +
 1032                     offsetof(struct ip, ip_tos), sizeof(tos), &tos);
 1033                 tos >>= 5;              /* NB: ECN + low 3 bits of DSCP */
 1034                 d_wme_ac = TID_TO_WME_AC(tos);
 1035         } else {
 1036 #endif /* INET */
 1037 #ifdef INET6
 1038         if (eh->ether_type == htons(ETHERTYPE_IPV6)) {
 1039                 uint32_t flow;
 1040                 uint8_t tos;
 1041                 /*
 1042                  * IPv6 frame, map the DSCP bits from the traffic class field.
 1043                  */
 1044                 m_copydata(m, sizeof(struct ether_header) +
 1045                     offsetof(struct ip6_hdr, ip6_flow), sizeof(flow),
 1046                     (caddr_t) &flow);
 1047                 tos = (uint8_t)(ntohl(flow) >> 20);
 1048                 tos >>= 5;              /* NB: ECN + low 3 bits of DSCP */
 1049                 d_wme_ac = TID_TO_WME_AC(tos);
 1050         } else {
 1051 #endif /* INET6 */
 1052                 d_wme_ac = WME_AC_BE;
 1053 #ifdef INET6
 1054         }
 1055 #endif
 1056 #ifdef INET
 1057         }
 1058 #endif
 1059         /*
 1060          * Use highest priority AC.
 1061          */
 1062         if (v_wme_ac > d_wme_ac)
 1063                 ac = v_wme_ac;
 1064         else
 1065                 ac = d_wme_ac;
 1066 
 1067         /*
 1068          * Apply ACM policy.
 1069          */
 1070         if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
 1071                 static const int acmap[4] = {
 1072                         WME_AC_BK,      /* WME_AC_BE */
 1073                         WME_AC_BK,      /* WME_AC_BK */
 1074                         WME_AC_BE,      /* WME_AC_VI */
 1075                         WME_AC_VI,      /* WME_AC_VO */
 1076                 };
 1077                 struct ieee80211com *ic = ni->ni_ic;
 1078 
 1079                 while (ac != WME_AC_BK &&
 1080                     ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
 1081                         ac = acmap[ac];
 1082         }
 1083 done:
 1084         M_WME_SETAC(m, ac);
 1085         return 0;
 1086 }
 1087 
 1088 /*
 1089  * Insure there is sufficient contiguous space to encapsulate the
 1090  * 802.11 data frame.  If room isn't already there, arrange for it.
 1091  * Drivers and cipher modules assume we have done the necessary work
 1092  * and fail rudely if they don't find the space they need.
 1093  */
 1094 struct mbuf *
 1095 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
 1096         struct ieee80211_key *key, struct mbuf *m)
 1097 {
 1098 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
 1099         int needed_space = vap->iv_ic->ic_headroom + hdrsize;
 1100 
 1101         if (key != NULL) {
 1102                 /* XXX belongs in crypto code? */
 1103                 needed_space += key->wk_cipher->ic_header;
 1104                 /* XXX frags */
 1105                 /*
 1106                  * When crypto is being done in the host we must insure
 1107                  * the data are writable for the cipher routines; clone
 1108                  * a writable mbuf chain.
 1109                  * XXX handle SWMIC specially
 1110                  */
 1111                 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
 1112                         m = m_unshare(m, M_NOWAIT);
 1113                         if (m == NULL) {
 1114                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 1115                                     "%s: cannot get writable mbuf\n", __func__);
 1116                                 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
 1117                                 return NULL;
 1118                         }
 1119                 }
 1120         }
 1121         /*
 1122          * We know we are called just before stripping an Ethernet
 1123          * header and prepending an LLC header.  This means we know
 1124          * there will be
 1125          *      sizeof(struct ether_header) - sizeof(struct llc)
 1126          * bytes recovered to which we need additional space for the
 1127          * 802.11 header and any crypto header.
 1128          */
 1129         /* XXX check trailing space and copy instead? */
 1130         if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
 1131                 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
 1132                 if (n == NULL) {
 1133                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
 1134                             "%s: cannot expand storage\n", __func__);
 1135                         vap->iv_stats.is_tx_nobuf++;
 1136                         m_freem(m);
 1137                         return NULL;
 1138                 }
 1139                 KASSERT(needed_space <= MHLEN,
 1140                     ("not enough room, need %u got %d\n", needed_space, MHLEN));
 1141                 /*
 1142                  * Setup new mbuf to have leading space to prepend the
 1143                  * 802.11 header and any crypto header bits that are
 1144                  * required (the latter are added when the driver calls
 1145                  * back to ieee80211_crypto_encap to do crypto encapsulation).
 1146                  */
 1147                 /* NB: must be first 'cuz it clobbers m_data */
 1148                 m_move_pkthdr(n, m);
 1149                 n->m_len = 0;                   /* NB: m_gethdr does not set */
 1150                 n->m_data += needed_space;
 1151                 /*
 1152                  * Pull up Ethernet header to create the expected layout.
 1153                  * We could use m_pullup but that's overkill (i.e. we don't
 1154                  * need the actual data) and it cannot fail so do it inline
 1155                  * for speed.
 1156                  */
 1157                 /* NB: struct ether_header is known to be contiguous */
 1158                 n->m_len += sizeof(struct ether_header);
 1159                 m->m_len -= sizeof(struct ether_header);
 1160                 m->m_data += sizeof(struct ether_header);
 1161                 /*
 1162                  * Replace the head of the chain.
 1163                  */
 1164                 n->m_next = m;
 1165                 m = n;
 1166         }
 1167         return m;
 1168 #undef TO_BE_RECLAIMED
 1169 }
 1170 
 1171 /*
 1172  * Return the transmit key to use in sending a unicast frame.
 1173  * If a unicast key is set we use that.  When no unicast key is set
 1174  * we fall back to the default transmit key.
 1175  */ 
 1176 static __inline struct ieee80211_key *
 1177 ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
 1178         struct ieee80211_node *ni)
 1179 {
 1180         if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
 1181                 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
 1182                     IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
 1183                         return NULL;
 1184                 return &vap->iv_nw_keys[vap->iv_def_txkey];
 1185         } else {
 1186                 return &ni->ni_ucastkey;
 1187         }
 1188 }
 1189 
 1190 /*
 1191  * Return the transmit key to use in sending a multicast frame.
 1192  * Multicast traffic always uses the group key which is installed as
 1193  * the default tx key.
 1194  */ 
 1195 static __inline struct ieee80211_key *
 1196 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
 1197         struct ieee80211_node *ni)
 1198 {
 1199         if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
 1200             IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
 1201                 return NULL;
 1202         return &vap->iv_nw_keys[vap->iv_def_txkey];
 1203 }
 1204 
 1205 /*
 1206  * Encapsulate an outbound data frame.  The mbuf chain is updated.
 1207  * If an error is encountered NULL is returned.  The caller is required
 1208  * to provide a node reference and pullup the ethernet header in the
 1209  * first mbuf.
 1210  *
 1211  * NB: Packet is assumed to be processed by ieee80211_classify which
 1212  *     marked EAPOL frames w/ M_EAPOL.
 1213  */
 1214 struct mbuf *
 1215 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
 1216     struct mbuf *m)
 1217 {
 1218 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
 1219 #define MC01(mc)        ((struct ieee80211_meshcntl_ae01 *)mc)
 1220         struct ieee80211com *ic = ni->ni_ic;
 1221 #ifdef IEEE80211_SUPPORT_MESH
 1222         struct ieee80211_mesh_state *ms = vap->iv_mesh;
 1223         struct ieee80211_meshcntl_ae10 *mc;
 1224         struct ieee80211_mesh_route *rt = NULL;
 1225         int dir = -1;
 1226 #endif
 1227         struct ether_header eh;
 1228         struct ieee80211_frame *wh;
 1229         struct ieee80211_key *key;
 1230         struct llc *llc;
 1231         int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
 1232         ieee80211_seq seqno;
 1233         int meshhdrsize, meshae;
 1234         uint8_t *qos;
 1235         int is_amsdu = 0;
 1236         
 1237         IEEE80211_TX_LOCK_ASSERT(ic);
 1238 
 1239         /*
 1240          * Copy existing Ethernet header to a safe place.  The
 1241          * rest of the code assumes it's ok to strip it when
 1242          * reorganizing state for the final encapsulation.
 1243          */
 1244         KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
 1245         ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
 1246 
 1247         /*
 1248          * Insure space for additional headers.  First identify
 1249          * transmit key to use in calculating any buffer adjustments
 1250          * required.  This is also used below to do privacy
 1251          * encapsulation work.  Then calculate the 802.11 header
 1252          * size and any padding required by the driver.
 1253          *
 1254          * Note key may be NULL if we fall back to the default
 1255          * transmit key and that is not set.  In that case the
 1256          * buffer may not be expanded as needed by the cipher
 1257          * routines, but they will/should discard it.
 1258          */
 1259         if (vap->iv_flags & IEEE80211_F_PRIVACY) {
 1260                 if (vap->iv_opmode == IEEE80211_M_STA ||
 1261                     !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
 1262                     (vap->iv_opmode == IEEE80211_M_WDS &&
 1263                      (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
 1264                         key = ieee80211_crypto_getucastkey(vap, ni);
 1265                 else
 1266                         key = ieee80211_crypto_getmcastkey(vap, ni);
 1267                 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
 1268                         IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
 1269                             eh.ether_dhost,
 1270                             "no default transmit key (%s) deftxkey %u",
 1271                             __func__, vap->iv_def_txkey);
 1272                         vap->iv_stats.is_tx_nodefkey++;
 1273                         goto bad;
 1274                 }
 1275         } else
 1276                 key = NULL;
 1277         /*
 1278          * XXX Some ap's don't handle QoS-encapsulated EAPOL
 1279          * frames so suppress use.  This may be an issue if other
 1280          * ap's require all data frames to be QoS-encapsulated
 1281          * once negotiated in which case we'll need to make this
 1282          * configurable.
 1283          * NB: mesh data frames are QoS.
 1284          */
 1285         addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) ||
 1286             (vap->iv_opmode == IEEE80211_M_MBSS)) &&
 1287             (m->m_flags & M_EAPOL) == 0;
 1288         if (addqos)
 1289                 hdrsize = sizeof(struct ieee80211_qosframe);
 1290         else
 1291                 hdrsize = sizeof(struct ieee80211_frame);
 1292 #ifdef IEEE80211_SUPPORT_MESH
 1293         if (vap->iv_opmode == IEEE80211_M_MBSS) {
 1294                 /*
 1295                  * Mesh data frames are encapsulated according to the
 1296                  * rules of Section 11B.8.5 (p.139 of D3.0 spec).
 1297                  * o Group Addressed data (aka multicast) originating
 1298                  *   at the local sta are sent w/ 3-address format and
 1299                  *   address extension mode 00
 1300                  * o Individually Addressed data (aka unicast) originating
 1301                  *   at the local sta are sent w/ 4-address format and
 1302                  *   address extension mode 00
 1303                  * o Group Addressed data forwarded from a non-mesh sta are
 1304                  *   sent w/ 3-address format and address extension mode 01
 1305                  * o Individually Address data from another sta are sent
 1306                  *   w/ 4-address format and address extension mode 10
 1307                  */
 1308                 is4addr = 0;            /* NB: don't use, disable */
 1309                 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) {
 1310                         rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost);
 1311                         KASSERT(rt != NULL, ("route is NULL"));
 1312                         dir = IEEE80211_FC1_DIR_DSTODS;
 1313                         hdrsize += IEEE80211_ADDR_LEN;
 1314                         if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
 1315                                 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate,
 1316                                     vap->iv_myaddr)) {
 1317                                         IEEE80211_NOTE_MAC(vap,
 1318                                             IEEE80211_MSG_MESH,
 1319                                             eh.ether_dhost,
 1320                                             "%s", "trying to send to ourself");
 1321                                         goto bad;
 1322                                 }
 1323                                 meshae = IEEE80211_MESH_AE_10;
 1324                                 meshhdrsize =
 1325                                     sizeof(struct ieee80211_meshcntl_ae10);
 1326                         } else {
 1327                                 meshae = IEEE80211_MESH_AE_00;
 1328                                 meshhdrsize =
 1329                                     sizeof(struct ieee80211_meshcntl);
 1330                         }
 1331                 } else {
 1332                         dir = IEEE80211_FC1_DIR_FROMDS;
 1333                         if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) {
 1334                                 /* proxy group */
 1335                                 meshae = IEEE80211_MESH_AE_01;
 1336                                 meshhdrsize =
 1337                                     sizeof(struct ieee80211_meshcntl_ae01);
 1338                         } else {
 1339                                 /* group */
 1340                                 meshae = IEEE80211_MESH_AE_00;
 1341                                 meshhdrsize = sizeof(struct ieee80211_meshcntl);
 1342                         }
 1343                 }
 1344         } else {
 1345 #endif
 1346                 /*
 1347                  * 4-address frames need to be generated for:
 1348                  * o packets sent through a WDS vap (IEEE80211_M_WDS)
 1349                  * o packets sent through a vap marked for relaying
 1350                  *   (e.g. a station operating with dynamic WDS)
 1351                  */
 1352                 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
 1353                     ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
 1354                      !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
 1355                 if (is4addr)
 1356                         hdrsize += IEEE80211_ADDR_LEN;
 1357                 meshhdrsize = meshae = 0;
 1358 #ifdef IEEE80211_SUPPORT_MESH
 1359         }
 1360 #endif
 1361         /*
 1362          * Honor driver DATAPAD requirement.
 1363          */
 1364         if (ic->ic_flags & IEEE80211_F_DATAPAD)
 1365                 hdrspace = roundup(hdrsize, sizeof(uint32_t));
 1366         else
 1367                 hdrspace = hdrsize;
 1368 
 1369         if (__predict_true((m->m_flags & M_FF) == 0)) {
 1370                 /*
 1371                  * Normal frame.
 1372                  */
 1373                 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
 1374                 if (m == NULL) {
 1375                         /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
 1376                         goto bad;
 1377                 }
 1378                 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
 1379                 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
 1380                 llc = mtod(m, struct llc *);
 1381                 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 1382                 llc->llc_control = LLC_UI;
 1383                 llc->llc_snap.org_code[0] = 0;
 1384                 llc->llc_snap.org_code[1] = 0;
 1385                 llc->llc_snap.org_code[2] = 0;
 1386                 llc->llc_snap.ether_type = eh.ether_type;
 1387         } else {
 1388 #ifdef IEEE80211_SUPPORT_SUPERG
 1389                 /*
 1390                  * Aggregated frame.  Check if it's for AMSDU or FF.
 1391                  *
 1392                  * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented
 1393                  * anywhere for some reason.  But, since 11n requires
 1394                  * AMSDU RX, we can just assume "11n" == "AMSDU".
 1395                  */
 1396                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__);
 1397                 if (ieee80211_amsdu_tx_ok(ni)) {
 1398                         m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key);
 1399                         is_amsdu = 1;
 1400                 } else {
 1401                         m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key);
 1402                 }
 1403                 if (m == NULL)
 1404 #endif
 1405                         goto bad;
 1406         }
 1407         datalen = m->m_pkthdr.len;              /* NB: w/o 802.11 header */
 1408 
 1409         M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT);
 1410         if (m == NULL) {
 1411                 vap->iv_stats.is_tx_nobuf++;
 1412                 goto bad;
 1413         }
 1414         wh = mtod(m, struct ieee80211_frame *);
 1415         wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
 1416         *(uint16_t *)wh->i_dur = 0;
 1417         qos = NULL;     /* NB: quiet compiler */
 1418         if (is4addr) {
 1419                 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
 1420                 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
 1421                 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1422                 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
 1423                 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
 1424         } else switch (vap->iv_opmode) {
 1425         case IEEE80211_M_STA:
 1426                 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
 1427                 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
 1428                 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
 1429                 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
 1430                 break;
 1431         case IEEE80211_M_IBSS:
 1432         case IEEE80211_M_AHDEMO:
 1433                 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 1434                 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1435                 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
 1436                 /*
 1437                  * NB: always use the bssid from iv_bss as the
 1438                  *     neighbor's may be stale after an ibss merge
 1439                  */
 1440                 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
 1441                 break;
 1442         case IEEE80211_M_HOSTAP:
 1443                 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
 1444                 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1445                 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
 1446                 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
 1447                 break;
 1448 #ifdef IEEE80211_SUPPORT_MESH
 1449         case IEEE80211_M_MBSS:
 1450                 /* NB: offset by hdrspace to deal with DATAPAD */
 1451                 mc = (struct ieee80211_meshcntl_ae10 *)
 1452                      (mtod(m, uint8_t *) + hdrspace);
 1453                 wh->i_fc[1] = dir;
 1454                 switch (meshae) {
 1455                 case IEEE80211_MESH_AE_00:      /* no proxy */
 1456                         mc->mc_flags = 0;
 1457                         if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */
 1458                                 IEEE80211_ADDR_COPY(wh->i_addr1,
 1459                                     ni->ni_macaddr);
 1460                                 IEEE80211_ADDR_COPY(wh->i_addr2,
 1461                                     vap->iv_myaddr);
 1462                                 IEEE80211_ADDR_COPY(wh->i_addr3,
 1463                                     eh.ether_dhost);
 1464                                 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4,
 1465                                     eh.ether_shost);
 1466                                 qos =((struct ieee80211_qosframe_addr4 *)
 1467                                     wh)->i_qos;
 1468                         } else if (dir == IEEE80211_FC1_DIR_FROMDS) {
 1469                                  /* mcast */
 1470                                 IEEE80211_ADDR_COPY(wh->i_addr1,
 1471                                     eh.ether_dhost);
 1472                                 IEEE80211_ADDR_COPY(wh->i_addr2,
 1473                                     vap->iv_myaddr);
 1474                                 IEEE80211_ADDR_COPY(wh->i_addr3,
 1475                                     eh.ether_shost);
 1476                                 qos = ((struct ieee80211_qosframe *)
 1477                                     wh)->i_qos;
 1478                         }
 1479                         break;
 1480                 case IEEE80211_MESH_AE_01:      /* mcast, proxy */
 1481                         wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
 1482                         IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
 1483                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1484                         IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr);
 1485                         mc->mc_flags = 1;
 1486                         IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4,
 1487                             eh.ether_shost);
 1488                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
 1489                         break;
 1490                 case IEEE80211_MESH_AE_10:      /* ucast, proxy */
 1491                         KASSERT(rt != NULL, ("route is NULL"));
 1492                         IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop);
 1493                         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 1494                         IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate);
 1495                         IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr);
 1496                         mc->mc_flags = IEEE80211_MESH_AE_10;
 1497                         IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost);
 1498                         IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost);
 1499                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
 1500                         break;
 1501                 default:
 1502                         KASSERT(0, ("meshae %d", meshae));
 1503                         break;
 1504                 }
 1505                 mc->mc_ttl = ms->ms_ttl;
 1506                 ms->ms_seq++;
 1507                 le32enc(mc->mc_seq, ms->ms_seq);
 1508                 break;
 1509 #endif
 1510         case IEEE80211_M_WDS:           /* NB: is4addr should always be true */
 1511         default:
 1512                 goto bad;
 1513         }
 1514         if (m->m_flags & M_MORE_DATA)
 1515                 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
 1516         if (addqos) {
 1517                 int ac, tid;
 1518 
 1519                 if (is4addr) {
 1520                         qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
 1521                 /* NB: mesh case handled earlier */
 1522                 } else if (vap->iv_opmode != IEEE80211_M_MBSS)
 1523                         qos = ((struct ieee80211_qosframe *) wh)->i_qos;
 1524                 ac = M_WME_GETAC(m);
 1525                 /* map from access class/queue to 11e header priorty value */
 1526                 tid = WME_AC_TO_TID(ac);
 1527                 qos[0] = tid & IEEE80211_QOS_TID;
 1528                 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
 1529                         qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
 1530 #ifdef IEEE80211_SUPPORT_MESH
 1531                 if (vap->iv_opmode == IEEE80211_M_MBSS)
 1532                         qos[1] = IEEE80211_QOS_MC;
 1533                 else
 1534 #endif
 1535                         qos[1] = 0;
 1536                 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
 1537 
 1538                 /*
 1539                  * If this is an A-MSDU then ensure we set the
 1540                  * relevant field.
 1541                  */
 1542                 if (is_amsdu)
 1543                         qos[0] |= IEEE80211_QOS_AMSDU;
 1544 
 1545                 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
 1546                         /*
 1547                          * NB: don't assign a sequence # to potential
 1548                          * aggregates; we expect this happens at the
 1549                          * point the frame comes off any aggregation q
 1550                          * as otherwise we may introduce holes in the
 1551                          * BA sequence space and/or make window accouting
 1552                          * more difficult.
 1553                          *
 1554                          * XXX may want to control this with a driver
 1555                          * capability; this may also change when we pull
 1556                          * aggregation up into net80211
 1557                          */
 1558                         seqno = ni->ni_txseqs[tid]++;
 1559                         *(uint16_t *)wh->i_seq =
 1560                             htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
 1561                         M_SEQNO_SET(m, seqno);
 1562                 }
 1563         } else {
 1564                 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
 1565                 *(uint16_t *)wh->i_seq =
 1566                     htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
 1567                 M_SEQNO_SET(m, seqno);
 1568 
 1569                 /*
 1570                  * XXX TODO: we shouldn't allow EAPOL, etc that would
 1571                  * be forced to be non-QoS traffic to be A-MSDU encapsulated.
 1572                  */
 1573                 if (is_amsdu)
 1574                         printf("%s: XXX ERROR: is_amsdu set; not QoS!\n",
 1575                             __func__);
 1576         }
 1577 
 1578 
 1579         /* check if xmit fragmentation is required */
 1580         txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
 1581             !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
 1582             (vap->iv_caps & IEEE80211_C_TXFRAG) &&
 1583             (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
 1584         if (key != NULL) {
 1585                 /*
 1586                  * IEEE 802.1X: send EAPOL frames always in the clear.
 1587                  * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
 1588                  */
 1589                 if ((m->m_flags & M_EAPOL) == 0 ||
 1590                     ((vap->iv_flags & IEEE80211_F_WPA) &&
 1591                      (vap->iv_opmode == IEEE80211_M_STA ?
 1592                       !IEEE80211_KEY_UNDEFINED(key) :
 1593                       !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
 1594                         wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
 1595                         if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
 1596                                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
 1597                                     eh.ether_dhost,
 1598                                     "%s", "enmic failed, discard frame");
 1599                                 vap->iv_stats.is_crypto_enmicfail++;
 1600                                 goto bad;
 1601                         }
 1602                 }
 1603         }
 1604         if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
 1605             key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
 1606                 goto bad;
 1607 
 1608         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 1609 
 1610         IEEE80211_NODE_STAT(ni, tx_data);
 1611         if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 1612                 IEEE80211_NODE_STAT(ni, tx_mcast);
 1613                 m->m_flags |= M_MCAST;
 1614         } else
 1615                 IEEE80211_NODE_STAT(ni, tx_ucast);
 1616         IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
 1617 
 1618         return m;
 1619 bad:
 1620         if (m != NULL)
 1621                 m_freem(m);
 1622         return NULL;
 1623 #undef WH4
 1624 #undef MC01
 1625 }
 1626 
 1627 void
 1628 ieee80211_free_mbuf(struct mbuf *m)
 1629 {
 1630         struct mbuf *next;
 1631 
 1632         if (m == NULL)
 1633                 return;
 1634 
 1635         do {
 1636                 next = m->m_nextpkt;
 1637                 m->m_nextpkt = NULL;
 1638                 m_freem(m);
 1639         } while ((m = next) != NULL);
 1640 }
 1641 
 1642 /*
 1643  * Fragment the frame according to the specified mtu.
 1644  * The size of the 802.11 header (w/o padding) is provided
 1645  * so we don't need to recalculate it.  We create a new
 1646  * mbuf for each fragment and chain it through m_nextpkt;
 1647  * we might be able to optimize this by reusing the original
 1648  * packet's mbufs but that is significantly more complicated.
 1649  */
 1650 static int
 1651 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
 1652         u_int hdrsize, u_int ciphdrsize, u_int mtu)
 1653 {
 1654         struct ieee80211com *ic = vap->iv_ic;
 1655         struct ieee80211_frame *wh, *whf;
 1656         struct mbuf *m, *prev;
 1657         u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
 1658         u_int hdrspace;
 1659 
 1660         KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
 1661         KASSERT(m0->m_pkthdr.len > mtu,
 1662                 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
 1663 
 1664         /*
 1665          * Honor driver DATAPAD requirement.
 1666          */
 1667         if (ic->ic_flags & IEEE80211_F_DATAPAD)
 1668                 hdrspace = roundup(hdrsize, sizeof(uint32_t));
 1669         else
 1670                 hdrspace = hdrsize;
 1671 
 1672         wh = mtod(m0, struct ieee80211_frame *);
 1673         /* NB: mark the first frag; it will be propagated below */
 1674         wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
 1675         totalhdrsize = hdrspace + ciphdrsize;
 1676         fragno = 1;
 1677         off = mtu - ciphdrsize;
 1678         remainder = m0->m_pkthdr.len - off;
 1679         prev = m0;
 1680         do {
 1681                 fragsize = MIN(totalhdrsize + remainder, mtu);
 1682                 m = m_get2(fragsize, M_NOWAIT, MT_DATA, M_PKTHDR);
 1683                 if (m == NULL)
 1684                         goto bad;
 1685                 /* leave room to prepend any cipher header */
 1686                 m_align(m, fragsize - ciphdrsize);
 1687 
 1688                 /*
 1689                  * Form the header in the fragment.  Note that since
 1690                  * we mark the first fragment with the MORE_FRAG bit
 1691                  * it automatically is propagated to each fragment; we
 1692                  * need only clear it on the last fragment (done below).
 1693                  * NB: frag 1+ dont have Mesh Control field present.
 1694                  */
 1695                 whf = mtod(m, struct ieee80211_frame *);
 1696                 memcpy(whf, wh, hdrsize);
 1697 #ifdef IEEE80211_SUPPORT_MESH
 1698                 if (vap->iv_opmode == IEEE80211_M_MBSS) {
 1699                         if (IEEE80211_IS_DSTODS(wh))
 1700                                 ((struct ieee80211_qosframe_addr4 *)
 1701                                     whf)->i_qos[1] &= ~IEEE80211_QOS_MC;
 1702                         else
 1703                                 ((struct ieee80211_qosframe *)
 1704                                     whf)->i_qos[1] &= ~IEEE80211_QOS_MC;
 1705                 }
 1706 #endif
 1707                 *(uint16_t *)&whf->i_seq[0] |= htole16(
 1708                         (fragno & IEEE80211_SEQ_FRAG_MASK) <<
 1709                                 IEEE80211_SEQ_FRAG_SHIFT);
 1710                 fragno++;
 1711 
 1712                 payload = fragsize - totalhdrsize;
 1713                 /* NB: destination is known to be contiguous */
 1714 
 1715                 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace);
 1716                 m->m_len = hdrspace + payload;
 1717                 m->m_pkthdr.len = hdrspace + payload;
 1718                 m->m_flags |= M_FRAG;
 1719 
 1720                 /* chain up the fragment */
 1721                 prev->m_nextpkt = m;
 1722                 prev = m;
 1723 
 1724                 /* deduct fragment just formed */
 1725                 remainder -= payload;
 1726                 off += payload;
 1727         } while (remainder != 0);
 1728 
 1729         /* set the last fragment */
 1730         m->m_flags |= M_LASTFRAG;
 1731         whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
 1732 
 1733         /* strip first mbuf now that everything has been copied */
 1734         m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
 1735         m0->m_flags |= M_FIRSTFRAG | M_FRAG;
 1736 
 1737         vap->iv_stats.is_tx_fragframes++;
 1738         vap->iv_stats.is_tx_frags += fragno-1;
 1739 
 1740         return 1;
 1741 bad:
 1742         /* reclaim fragments but leave original frame for caller to free */
 1743         ieee80211_free_mbuf(m0->m_nextpkt);
 1744         m0->m_nextpkt = NULL;
 1745         return 0;
 1746 }
 1747 
 1748 /*
 1749  * Add a supported rates element id to a frame.
 1750  */
 1751 uint8_t *
 1752 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
 1753 {
 1754         int nrates;
 1755 
 1756         *frm++ = IEEE80211_ELEMID_RATES;
 1757         nrates = rs->rs_nrates;
 1758         if (nrates > IEEE80211_RATE_SIZE)
 1759                 nrates = IEEE80211_RATE_SIZE;
 1760         *frm++ = nrates;
 1761         memcpy(frm, rs->rs_rates, nrates);
 1762         return frm + nrates;
 1763 }
 1764 
 1765 /*
 1766  * Add an extended supported rates element id to a frame.
 1767  */
 1768 uint8_t *
 1769 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
 1770 {
 1771         /*
 1772          * Add an extended supported rates element if operating in 11g mode.
 1773          */
 1774         if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
 1775                 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
 1776                 *frm++ = IEEE80211_ELEMID_XRATES;
 1777                 *frm++ = nrates;
 1778                 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
 1779                 frm += nrates;
 1780         }
 1781         return frm;
 1782 }
 1783 
 1784 /* 
 1785  * Add an ssid element to a frame.
 1786  */
 1787 uint8_t *
 1788 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
 1789 {
 1790         *frm++ = IEEE80211_ELEMID_SSID;
 1791         *frm++ = len;
 1792         memcpy(frm, ssid, len);
 1793         return frm + len;
 1794 }
 1795 
 1796 /*
 1797  * Add an erp element to a frame.
 1798  */
 1799 static uint8_t *
 1800 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
 1801 {
 1802         uint8_t erp;
 1803 
 1804         *frm++ = IEEE80211_ELEMID_ERP;
 1805         *frm++ = 1;
 1806         erp = 0;
 1807         if (ic->ic_nonerpsta != 0)
 1808                 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
 1809         if (ic->ic_flags & IEEE80211_F_USEPROT)
 1810                 erp |= IEEE80211_ERP_USE_PROTECTION;
 1811         if (ic->ic_flags & IEEE80211_F_USEBARKER)
 1812                 erp |= IEEE80211_ERP_LONG_PREAMBLE;
 1813         *frm++ = erp;
 1814         return frm;
 1815 }
 1816 
 1817 /*
 1818  * Add a CFParams element to a frame.
 1819  */
 1820 static uint8_t *
 1821 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
 1822 {
 1823 #define ADDSHORT(frm, v) do {   \
 1824         le16enc(frm, v);        \
 1825         frm += 2;               \
 1826 } while (0)
 1827         *frm++ = IEEE80211_ELEMID_CFPARMS;
 1828         *frm++ = 6;
 1829         *frm++ = 0;             /* CFP count */
 1830         *frm++ = 2;             /* CFP period */
 1831         ADDSHORT(frm, 0);       /* CFP MaxDuration (TU) */
 1832         ADDSHORT(frm, 0);       /* CFP CurRemaining (TU) */
 1833         return frm;
 1834 #undef ADDSHORT
 1835 }
 1836 
 1837 static __inline uint8_t *
 1838 add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
 1839 {
 1840         memcpy(frm, ie->ie_data, ie->ie_len);
 1841         return frm + ie->ie_len;
 1842 }
 1843 
 1844 static __inline uint8_t *
 1845 add_ie(uint8_t *frm, const uint8_t *ie)
 1846 {
 1847         memcpy(frm, ie, 2 + ie[1]);
 1848         return frm + 2 + ie[1];
 1849 }
 1850 
 1851 #define WME_OUI_BYTES           0x00, 0x50, 0xf2
 1852 /*
 1853  * Add a WME information element to a frame.
 1854  */
 1855 uint8_t *
 1856 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
 1857 {
 1858         static const struct ieee80211_wme_info info = {
 1859                 .wme_id         = IEEE80211_ELEMID_VENDOR,
 1860                 .wme_len        = sizeof(struct ieee80211_wme_info) - 2,
 1861                 .wme_oui        = { WME_OUI_BYTES },
 1862                 .wme_type       = WME_OUI_TYPE,
 1863                 .wme_subtype    = WME_INFO_OUI_SUBTYPE,
 1864                 .wme_version    = WME_VERSION,
 1865                 .wme_info       = 0,
 1866         };
 1867         memcpy(frm, &info, sizeof(info));
 1868         return frm + sizeof(info); 
 1869 }
 1870 
 1871 /*
 1872  * Add a WME parameters element to a frame.
 1873  */
 1874 static uint8_t *
 1875 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
 1876 {
 1877 #define SM(_v, _f)      (((_v) << _f##_S) & _f)
 1878 #define ADDSHORT(frm, v) do {   \
 1879         le16enc(frm, v);        \
 1880         frm += 2;               \
 1881 } while (0)
 1882         /* NB: this works 'cuz a param has an info at the front */
 1883         static const struct ieee80211_wme_info param = {
 1884                 .wme_id         = IEEE80211_ELEMID_VENDOR,
 1885                 .wme_len        = sizeof(struct ieee80211_wme_param) - 2,
 1886                 .wme_oui        = { WME_OUI_BYTES },
 1887                 .wme_type       = WME_OUI_TYPE,
 1888                 .wme_subtype    = WME_PARAM_OUI_SUBTYPE,
 1889                 .wme_version    = WME_VERSION,
 1890         };
 1891         int i;
 1892 
 1893         memcpy(frm, &param, sizeof(param));
 1894         frm += __offsetof(struct ieee80211_wme_info, wme_info);
 1895         *frm++ = wme->wme_bssChanParams.cap_info;       /* AC info */
 1896         *frm++ = 0;                                     /* reserved field */
 1897         for (i = 0; i < WME_NUM_AC; i++) {
 1898                 const struct wmeParams *ac =
 1899                        &wme->wme_bssChanParams.cap_wmeParams[i];
 1900                 *frm++ = SM(i, WME_PARAM_ACI)
 1901                        | SM(ac->wmep_acm, WME_PARAM_ACM)
 1902                        | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
 1903                        ;
 1904                 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
 1905                        | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
 1906                        ;
 1907                 ADDSHORT(frm, ac->wmep_txopLimit);
 1908         }
 1909         return frm;
 1910 #undef SM
 1911 #undef ADDSHORT
 1912 }
 1913 #undef WME_OUI_BYTES
 1914 
 1915 /*
 1916  * Add an 11h Power Constraint element to a frame.
 1917  */
 1918 static uint8_t *
 1919 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
 1920 {
 1921         const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
 1922         /* XXX per-vap tx power limit? */
 1923         int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
 1924 
 1925         frm[0] = IEEE80211_ELEMID_PWRCNSTR;
 1926         frm[1] = 1;
 1927         frm[2] = c->ic_maxregpower > limit ?  c->ic_maxregpower - limit : 0;
 1928         return frm + 3;
 1929 }
 1930 
 1931 /*
 1932  * Add an 11h Power Capability element to a frame.
 1933  */
 1934 static uint8_t *
 1935 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
 1936 {
 1937         frm[0] = IEEE80211_ELEMID_PWRCAP;
 1938         frm[1] = 2;
 1939         frm[2] = c->ic_minpower;
 1940         frm[3] = c->ic_maxpower;
 1941         return frm + 4;
 1942 }
 1943 
 1944 /*
 1945  * Add an 11h Supported Channels element to a frame.
 1946  */
 1947 static uint8_t *
 1948 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
 1949 {
 1950         static const int ielen = 26;
 1951 
 1952         frm[0] = IEEE80211_ELEMID_SUPPCHAN;
 1953         frm[1] = ielen;
 1954         /* XXX not correct */
 1955         memcpy(frm+2, ic->ic_chan_avail, ielen);
 1956         return frm + 2 + ielen;
 1957 }
 1958 
 1959 /*
 1960  * Add an 11h Quiet time element to a frame.
 1961  */
 1962 static uint8_t *
 1963 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap)
 1964 {
 1965         struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm;
 1966 
 1967         quiet->quiet_ie = IEEE80211_ELEMID_QUIET;
 1968         quiet->len = 6;
 1969         if (vap->iv_quiet_count_value == 1)
 1970                 vap->iv_quiet_count_value = vap->iv_quiet_count;
 1971         else if (vap->iv_quiet_count_value > 1)
 1972                 vap->iv_quiet_count_value--;
 1973 
 1974         if (vap->iv_quiet_count_value == 0) {
 1975                 /* value 0 is reserved as per 802.11h standerd */
 1976                 vap->iv_quiet_count_value = 1;
 1977         }
 1978 
 1979         quiet->tbttcount = vap->iv_quiet_count_value;
 1980         quiet->period = vap->iv_quiet_period;
 1981         quiet->duration = htole16(vap->iv_quiet_duration);
 1982         quiet->offset = htole16(vap->iv_quiet_offset);
 1983         return frm + sizeof(*quiet);
 1984 }
 1985 
 1986 /*
 1987  * Add an 11h Channel Switch Announcement element to a frame.
 1988  * Note that we use the per-vap CSA count to adjust the global
 1989  * counter so we can use this routine to form probe response
 1990  * frames and get the current count.
 1991  */
 1992 static uint8_t *
 1993 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
 1994 {
 1995         struct ieee80211com *ic = vap->iv_ic;
 1996         struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
 1997 
 1998         csa->csa_ie = IEEE80211_ELEMID_CSA;
 1999         csa->csa_len = 3;
 2000         csa->csa_mode = 1;              /* XXX force quiet on channel */
 2001         csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
 2002         csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
 2003         return frm + sizeof(*csa);
 2004 }
 2005 
 2006 /*
 2007  * Add an 11h country information element to a frame.
 2008  */
 2009 static uint8_t *
 2010 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
 2011 {
 2012 
 2013         if (ic->ic_countryie == NULL ||
 2014             ic->ic_countryie_chan != ic->ic_bsschan) {
 2015                 /*
 2016                  * Handle lazy construction of ie.  This is done on
 2017                  * first use and after a channel change that requires
 2018                  * re-calculation.
 2019                  */
 2020                 if (ic->ic_countryie != NULL)
 2021                         IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
 2022                 ic->ic_countryie = ieee80211_alloc_countryie(ic);
 2023                 if (ic->ic_countryie == NULL)
 2024                         return frm;
 2025                 ic->ic_countryie_chan = ic->ic_bsschan;
 2026         }
 2027         return add_appie(frm, ic->ic_countryie);
 2028 }
 2029 
 2030 uint8_t *
 2031 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap)
 2032 {
 2033         if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL)
 2034                 return (add_ie(frm, vap->iv_wpa_ie));
 2035         else {
 2036                 /* XXX else complain? */
 2037                 return (frm);
 2038         }
 2039 }
 2040 
 2041 uint8_t *
 2042 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap)
 2043 {
 2044         if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL)
 2045                 return (add_ie(frm, vap->iv_rsn_ie));
 2046         else {
 2047                 /* XXX else complain? */
 2048                 return (frm);
 2049         }
 2050 }
 2051 
 2052 uint8_t *
 2053 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni)
 2054 {
 2055         if (ni->ni_flags & IEEE80211_NODE_QOS) {
 2056                 *frm++ = IEEE80211_ELEMID_QOS;
 2057                 *frm++ = 1;
 2058                 *frm++ = 0;
 2059         }
 2060 
 2061         return (frm);
 2062 }
 2063 
 2064 /*
 2065  * Send a probe request frame with the specified ssid
 2066  * and any optional information element data.
 2067  */
 2068 int
 2069 ieee80211_send_probereq(struct ieee80211_node *ni,
 2070         const uint8_t sa[IEEE80211_ADDR_LEN],
 2071         const uint8_t da[IEEE80211_ADDR_LEN],
 2072         const uint8_t bssid[IEEE80211_ADDR_LEN],
 2073         const uint8_t *ssid, size_t ssidlen)
 2074 {
 2075         struct ieee80211vap *vap = ni->ni_vap;
 2076         struct ieee80211com *ic = ni->ni_ic;
 2077         const struct ieee80211_txparam *tp;
 2078         struct ieee80211_bpf_params params;
 2079         const struct ieee80211_rateset *rs;
 2080         struct mbuf *m;
 2081         uint8_t *frm;
 2082         int ret;
 2083 
 2084         if (vap->iv_state == IEEE80211_S_CAC) {
 2085                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
 2086                     "block %s frame in CAC state", "probe request");
 2087                 vap->iv_stats.is_tx_badstate++;
 2088                 return EIO;             /* XXX */
 2089         }
 2090 
 2091         /*
 2092          * Hold a reference on the node so it doesn't go away until after
 2093          * the xmit is complete all the way in the driver.  On error we
 2094          * will remove our reference.
 2095          */
 2096         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2097                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 2098                 __func__, __LINE__,
 2099                 ni, ether_sprintf(ni->ni_macaddr),
 2100                 ieee80211_node_refcnt(ni)+1);
 2101         ieee80211_ref_node(ni);
 2102 
 2103         /*
 2104          * prreq frame format
 2105          *      [tlv] ssid
 2106          *      [tlv] supported rates
 2107          *      [tlv] RSN (optional)
 2108          *      [tlv] extended supported rates
 2109          *      [tlv] WPA (optional)
 2110          *      [tlv] user-specified ie's
 2111          */
 2112         m = ieee80211_getmgtframe(&frm,
 2113                  ic->ic_headroom + sizeof(struct ieee80211_frame),
 2114                  2 + IEEE80211_NWID_LEN
 2115                + 2 + IEEE80211_RATE_SIZE
 2116                + sizeof(struct ieee80211_ie_wpa)
 2117                + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2118                + sizeof(struct ieee80211_ie_wpa)
 2119                + (vap->iv_appie_probereq != NULL ?
 2120                    vap->iv_appie_probereq->ie_len : 0)
 2121         );
 2122         if (m == NULL) {
 2123                 vap->iv_stats.is_tx_nobuf++;
 2124                 ieee80211_free_node(ni);
 2125                 return ENOMEM;
 2126         }
 2127 
 2128         frm = ieee80211_add_ssid(frm, ssid, ssidlen);
 2129         rs = ieee80211_get_suprates(ic, ic->ic_curchan);
 2130         frm = ieee80211_add_rates(frm, rs);
 2131         frm = ieee80211_add_rsn(frm, vap);
 2132         frm = ieee80211_add_xrates(frm, rs);
 2133         frm = ieee80211_add_wpa(frm, vap);
 2134         if (vap->iv_appie_probereq != NULL)
 2135                 frm = add_appie(frm, vap->iv_appie_probereq);
 2136         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2137 
 2138         KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
 2139             ("leading space %zd", M_LEADINGSPACE(m)));
 2140         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
 2141         if (m == NULL) {
 2142                 /* NB: cannot happen */
 2143                 ieee80211_free_node(ni);
 2144                 return ENOMEM;
 2145         }
 2146 
 2147         IEEE80211_TX_LOCK(ic);
 2148         ieee80211_send_setup(ni, m,
 2149              IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
 2150              IEEE80211_NONQOS_TID, sa, da, bssid);
 2151         /* XXX power management? */
 2152         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 2153 
 2154         M_WME_SETAC(m, WME_AC_BE);
 2155 
 2156         IEEE80211_NODE_STAT(ni, tx_probereq);
 2157         IEEE80211_NODE_STAT(ni, tx_mgmt);
 2158 
 2159         IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
 2160             "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
 2161             ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
 2162             ssidlen, ssid);
 2163 
 2164         memset(&params, 0, sizeof(params));
 2165         params.ibp_pri = M_WME_GETAC(m);
 2166         tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
 2167         params.ibp_rate0 = tp->mgmtrate;
 2168         if (IEEE80211_IS_MULTICAST(da)) {
 2169                 params.ibp_flags |= IEEE80211_BPF_NOACK;
 2170                 params.ibp_try0 = 1;
 2171         } else
 2172                 params.ibp_try0 = tp->maxretry;
 2173         params.ibp_power = ni->ni_txpower;
 2174         ret = ieee80211_raw_output(vap, ni, m, &params);
 2175         IEEE80211_TX_UNLOCK(ic);
 2176         return (ret);
 2177 }
 2178 
 2179 /*
 2180  * Calculate capability information for mgt frames.
 2181  */
 2182 uint16_t
 2183 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
 2184 {
 2185         struct ieee80211com *ic = vap->iv_ic;
 2186         uint16_t capinfo;
 2187 
 2188         KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
 2189 
 2190         if (vap->iv_opmode == IEEE80211_M_HOSTAP)
 2191                 capinfo = IEEE80211_CAPINFO_ESS;
 2192         else if (vap->iv_opmode == IEEE80211_M_IBSS)
 2193                 capinfo = IEEE80211_CAPINFO_IBSS;
 2194         else
 2195                 capinfo = 0;
 2196         if (vap->iv_flags & IEEE80211_F_PRIVACY)
 2197                 capinfo |= IEEE80211_CAPINFO_PRIVACY;
 2198         if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
 2199             IEEE80211_IS_CHAN_2GHZ(chan))
 2200                 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
 2201         if (ic->ic_flags & IEEE80211_F_SHSLOT)
 2202                 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
 2203         if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
 2204                 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
 2205         return capinfo;
 2206 }
 2207 
 2208 /*
 2209  * Send a management frame.  The node is for the destination (or ic_bss
 2210  * when in station mode).  Nodes other than ic_bss have their reference
 2211  * count bumped to reflect our use for an indeterminant time.
 2212  */
 2213 int
 2214 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
 2215 {
 2216 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
 2217 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
 2218         struct ieee80211vap *vap = ni->ni_vap;
 2219         struct ieee80211com *ic = ni->ni_ic;
 2220         struct ieee80211_node *bss = vap->iv_bss;
 2221         struct ieee80211_bpf_params params;
 2222         struct mbuf *m;
 2223         uint8_t *frm;
 2224         uint16_t capinfo;
 2225         int has_challenge, is_shared_key, ret, status;
 2226 
 2227         KASSERT(ni != NULL, ("null node"));
 2228 
 2229         /*
 2230          * Hold a reference on the node so it doesn't go away until after
 2231          * the xmit is complete all the way in the driver.  On error we
 2232          * will remove our reference.
 2233          */
 2234         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2235                 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 2236                 __func__, __LINE__,
 2237                 ni, ether_sprintf(ni->ni_macaddr),
 2238                 ieee80211_node_refcnt(ni)+1);
 2239         ieee80211_ref_node(ni);
 2240 
 2241         memset(&params, 0, sizeof(params));
 2242         switch (type) {
 2243 
 2244         case IEEE80211_FC0_SUBTYPE_AUTH:
 2245                 status = arg >> 16;
 2246                 arg &= 0xffff;
 2247                 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
 2248                     arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
 2249                     ni->ni_challenge != NULL);
 2250 
 2251                 /*
 2252                  * Deduce whether we're doing open authentication or
 2253                  * shared key authentication.  We do the latter if
 2254                  * we're in the middle of a shared key authentication
 2255                  * handshake or if we're initiating an authentication
 2256                  * request and configured to use shared key.
 2257                  */
 2258                 is_shared_key = has_challenge ||
 2259                      arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
 2260                      (arg == IEEE80211_AUTH_SHARED_REQUEST &&
 2261                       bss->ni_authmode == IEEE80211_AUTH_SHARED);
 2262 
 2263                 m = ieee80211_getmgtframe(&frm,
 2264                           ic->ic_headroom + sizeof(struct ieee80211_frame),
 2265                           3 * sizeof(uint16_t)
 2266                         + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
 2267                                 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
 2268                 );
 2269                 if (m == NULL)
 2270                         senderr(ENOMEM, is_tx_nobuf);
 2271 
 2272                 ((uint16_t *)frm)[0] =
 2273                     (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
 2274                                     : htole16(IEEE80211_AUTH_ALG_OPEN);
 2275                 ((uint16_t *)frm)[1] = htole16(arg);    /* sequence number */
 2276                 ((uint16_t *)frm)[2] = htole16(status);/* status */
 2277 
 2278                 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
 2279                         ((uint16_t *)frm)[3] =
 2280                             htole16((IEEE80211_CHALLENGE_LEN << 8) |
 2281                             IEEE80211_ELEMID_CHALLENGE);
 2282                         memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
 2283                             IEEE80211_CHALLENGE_LEN);
 2284                         m->m_pkthdr.len = m->m_len =
 2285                                 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
 2286                         if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
 2287                                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 2288                                     "request encrypt frame (%s)", __func__);
 2289                                 /* mark frame for encryption */
 2290                                 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
 2291                         }
 2292                 } else
 2293                         m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
 2294 
 2295                 /* XXX not right for shared key */
 2296                 if (status == IEEE80211_STATUS_SUCCESS)
 2297                         IEEE80211_NODE_STAT(ni, tx_auth);
 2298                 else
 2299                         IEEE80211_NODE_STAT(ni, tx_auth_fail);
 2300 
 2301                 if (vap->iv_opmode == IEEE80211_M_STA)
 2302                         ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
 2303                                 (void *) vap->iv_state);
 2304                 break;
 2305 
 2306         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 2307                 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
 2308                     "send station deauthenticate (reason: %d (%s))", arg,
 2309                     ieee80211_reason_to_string(arg));
 2310                 m = ieee80211_getmgtframe(&frm,
 2311                         ic->ic_headroom + sizeof(struct ieee80211_frame),
 2312                         sizeof(uint16_t));
 2313                 if (m == NULL)
 2314                         senderr(ENOMEM, is_tx_nobuf);
 2315                 *(uint16_t *)frm = htole16(arg);        /* reason */
 2316                 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
 2317 
 2318                 IEEE80211_NODE_STAT(ni, tx_deauth);
 2319                 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
 2320 
 2321                 ieee80211_node_unauthorize(ni);         /* port closed */
 2322                 break;
 2323 
 2324         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 2325         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 2326                 /*
 2327                  * asreq frame format
 2328                  *      [2] capability information
 2329                  *      [2] listen interval
 2330                  *      [6*] current AP address (reassoc only)
 2331                  *      [tlv] ssid
 2332                  *      [tlv] supported rates
 2333                  *      [tlv] extended supported rates
 2334                  *      [4] power capability (optional)
 2335                  *      [28] supported channels (optional)
 2336                  *      [tlv] HT capabilities
 2337                  *      [tlv] WME (optional)
 2338                  *      [tlv] Vendor OUI HT capabilities (optional)
 2339                  *      [tlv] Atheros capabilities (if negotiated)
 2340                  *      [tlv] AppIE's (optional)
 2341                  */
 2342                 m = ieee80211_getmgtframe(&frm,
 2343                          ic->ic_headroom + sizeof(struct ieee80211_frame),
 2344                          sizeof(uint16_t)
 2345                        + sizeof(uint16_t)
 2346                        + IEEE80211_ADDR_LEN
 2347                        + 2 + IEEE80211_NWID_LEN
 2348                        + 2 + IEEE80211_RATE_SIZE
 2349                        + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2350                        + 4
 2351                        + 2 + 26
 2352                        + sizeof(struct ieee80211_wme_info)
 2353                        + sizeof(struct ieee80211_ie_htcap)
 2354                        + 4 + sizeof(struct ieee80211_ie_htcap)
 2355 #ifdef IEEE80211_SUPPORT_SUPERG
 2356                        + sizeof(struct ieee80211_ath_ie)
 2357 #endif
 2358                        + (vap->iv_appie_wpa != NULL ?
 2359                                 vap->iv_appie_wpa->ie_len : 0)
 2360                        + (vap->iv_appie_assocreq != NULL ?
 2361                                 vap->iv_appie_assocreq->ie_len : 0)
 2362                 );
 2363                 if (m == NULL)
 2364                         senderr(ENOMEM, is_tx_nobuf);
 2365 
 2366                 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
 2367                     ("wrong mode %u", vap->iv_opmode));
 2368                 capinfo = IEEE80211_CAPINFO_ESS;
 2369                 if (vap->iv_flags & IEEE80211_F_PRIVACY)
 2370                         capinfo |= IEEE80211_CAPINFO_PRIVACY;
 2371                 /*
 2372                  * NB: Some 11a AP's reject the request when
 2373                  *     short premable is set.
 2374                  */
 2375                 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
 2376                     IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
 2377                         capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
 2378                 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
 2379                     (ic->ic_caps & IEEE80211_C_SHSLOT))
 2380                         capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
 2381                 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
 2382                     (vap->iv_flags & IEEE80211_F_DOTH))
 2383                         capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
 2384                 *(uint16_t *)frm = htole16(capinfo);
 2385                 frm += 2;
 2386 
 2387                 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
 2388                 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
 2389                                                     bss->ni_intval));
 2390                 frm += 2;
 2391 
 2392                 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
 2393                         IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
 2394                         frm += IEEE80211_ADDR_LEN;
 2395                 }
 2396 
 2397                 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
 2398                 frm = ieee80211_add_rates(frm, &ni->ni_rates);
 2399                 frm = ieee80211_add_rsn(frm, vap);
 2400                 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
 2401                 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
 2402                         frm = ieee80211_add_powercapability(frm,
 2403                             ic->ic_curchan);
 2404                         frm = ieee80211_add_supportedchannels(frm, ic);
 2405                 }
 2406 
 2407                 /*
 2408                  * Check the channel - we may be using an 11n NIC with an
 2409                  * 11n capable station, but we're configured to be an 11b
 2410                  * channel.
 2411                  */
 2412                 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
 2413                     IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
 2414                     ni->ni_ies.htcap_ie != NULL &&
 2415                     ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) {
 2416                         frm = ieee80211_add_htcap(frm, ni);
 2417                 }
 2418                 frm = ieee80211_add_wpa(frm, vap);
 2419                 if ((ic->ic_flags & IEEE80211_F_WME) &&
 2420                     ni->ni_ies.wme_ie != NULL)
 2421                         frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
 2422 
 2423                 /*
 2424                  * Same deal - only send HT info if we're on an 11n
 2425                  * capable channel.
 2426                  */
 2427                 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
 2428                     IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
 2429                     ni->ni_ies.htcap_ie != NULL &&
 2430                     ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) {
 2431                         frm = ieee80211_add_htcap_vendor(frm, ni);
 2432                 }
 2433 #ifdef IEEE80211_SUPPORT_SUPERG
 2434                 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) {
 2435                         frm = ieee80211_add_ath(frm, 
 2436                                 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
 2437                                 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
 2438                                  ni->ni_authmode != IEEE80211_AUTH_8021X) ?
 2439                                 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
 2440                 }
 2441 #endif /* IEEE80211_SUPPORT_SUPERG */
 2442                 if (vap->iv_appie_assocreq != NULL)
 2443                         frm = add_appie(frm, vap->iv_appie_assocreq);
 2444                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2445 
 2446                 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
 2447                         (void *) vap->iv_state);
 2448                 break;
 2449 
 2450         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 2451         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 2452                 /*
 2453                  * asresp frame format
 2454                  *      [2] capability information
 2455                  *      [2] status
 2456                  *      [2] association ID
 2457                  *      [tlv] supported rates
 2458                  *      [tlv] extended supported rates
 2459                  *      [tlv] HT capabilities (standard, if STA enabled)
 2460                  *      [tlv] HT information (standard, if STA enabled)
 2461                  *      [tlv] WME (if configured and STA enabled)
 2462                  *      [tlv] HT capabilities (vendor OUI, if STA enabled)
 2463                  *      [tlv] HT information (vendor OUI, if STA enabled)
 2464                  *      [tlv] Atheros capabilities (if STA enabled)
 2465                  *      [tlv] AppIE's (optional)
 2466                  */
 2467                 m = ieee80211_getmgtframe(&frm,
 2468                          ic->ic_headroom + sizeof(struct ieee80211_frame),
 2469                          sizeof(uint16_t)
 2470                        + sizeof(uint16_t)
 2471                        + sizeof(uint16_t)
 2472                        + 2 + IEEE80211_RATE_SIZE
 2473                        + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2474                        + sizeof(struct ieee80211_ie_htcap) + 4
 2475                        + sizeof(struct ieee80211_ie_htinfo) + 4
 2476                        + sizeof(struct ieee80211_wme_param)
 2477 #ifdef IEEE80211_SUPPORT_SUPERG
 2478                        + sizeof(struct ieee80211_ath_ie)
 2479 #endif
 2480                        + (vap->iv_appie_assocresp != NULL ?
 2481                                 vap->iv_appie_assocresp->ie_len : 0)
 2482                 );
 2483                 if (m == NULL)
 2484                         senderr(ENOMEM, is_tx_nobuf);
 2485 
 2486                 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
 2487                 *(uint16_t *)frm = htole16(capinfo);
 2488                 frm += 2;
 2489 
 2490                 *(uint16_t *)frm = htole16(arg);        /* status */
 2491                 frm += 2;
 2492 
 2493                 if (arg == IEEE80211_STATUS_SUCCESS) {
 2494                         *(uint16_t *)frm = htole16(ni->ni_associd);
 2495                         IEEE80211_NODE_STAT(ni, tx_assoc);
 2496                 } else
 2497                         IEEE80211_NODE_STAT(ni, tx_assoc_fail);
 2498                 frm += 2;
 2499 
 2500                 frm = ieee80211_add_rates(frm, &ni->ni_rates);
 2501                 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
 2502                 /* NB: respond according to what we received */
 2503                 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) {
 2504                         frm = ieee80211_add_htcap(frm, ni);
 2505                         frm = ieee80211_add_htinfo(frm, ni);
 2506                 }
 2507                 if ((vap->iv_flags & IEEE80211_F_WME) &&
 2508                     ni->ni_ies.wme_ie != NULL)
 2509                         frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
 2510                 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) {
 2511                         frm = ieee80211_add_htcap_vendor(frm, ni);
 2512                         frm = ieee80211_add_htinfo_vendor(frm, ni);
 2513                 }
 2514 #ifdef IEEE80211_SUPPORT_SUPERG
 2515                 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS))
 2516                         frm = ieee80211_add_ath(frm, 
 2517                                 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
 2518                                 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
 2519                                  ni->ni_authmode != IEEE80211_AUTH_8021X) ?
 2520                                 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
 2521 #endif /* IEEE80211_SUPPORT_SUPERG */
 2522                 if (vap->iv_appie_assocresp != NULL)
 2523                         frm = add_appie(frm, vap->iv_appie_assocresp);
 2524                 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2525                 break;
 2526 
 2527         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 2528                 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
 2529                     "send station disassociate (reason: %d (%s))", arg,
 2530                     ieee80211_reason_to_string(arg));
 2531                 m = ieee80211_getmgtframe(&frm,
 2532                         ic->ic_headroom + sizeof(struct ieee80211_frame),
 2533                         sizeof(uint16_t));
 2534                 if (m == NULL)
 2535                         senderr(ENOMEM, is_tx_nobuf);
 2536                 *(uint16_t *)frm = htole16(arg);        /* reason */
 2537                 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
 2538 
 2539                 IEEE80211_NODE_STAT(ni, tx_disassoc);
 2540                 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
 2541                 break;
 2542 
 2543         default:
 2544                 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
 2545                     "invalid mgmt frame type %u", type);
 2546                 senderr(EINVAL, is_tx_unknownmgt);
 2547                 /* NOTREACHED */
 2548         }
 2549 
 2550         /* NB: force non-ProbeResp frames to the highest queue */
 2551         params.ibp_pri = WME_AC_VO;
 2552         params.ibp_rate0 = bss->ni_txparms->mgmtrate;
 2553         /* NB: we know all frames are unicast */
 2554         params.ibp_try0 = bss->ni_txparms->maxretry;
 2555         params.ibp_power = bss->ni_txpower;
 2556         return ieee80211_mgmt_output(ni, m, type, &params);
 2557 bad:
 2558         ieee80211_free_node(ni);
 2559         return ret;
 2560 #undef senderr
 2561 #undef HTFLAGS
 2562 }
 2563 
 2564 /*
 2565  * Return an mbuf with a probe response frame in it.
 2566  * Space is left to prepend and 802.11 header at the
 2567  * front but it's left to the caller to fill in.
 2568  */
 2569 struct mbuf *
 2570 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy)
 2571 {
 2572         struct ieee80211vap *vap = bss->ni_vap;
 2573         struct ieee80211com *ic = bss->ni_ic;
 2574         const struct ieee80211_rateset *rs;
 2575         struct mbuf *m;
 2576         uint16_t capinfo;
 2577         uint8_t *frm;
 2578 
 2579         /*
 2580          * probe response frame format
 2581          *      [8] time stamp
 2582          *      [2] beacon interval
 2583          *      [2] cabability information
 2584          *      [tlv] ssid
 2585          *      [tlv] supported rates
 2586          *      [tlv] parameter set (FH/DS)
 2587          *      [tlv] parameter set (IBSS)
 2588          *      [tlv] country (optional)
 2589          *      [3] power control (optional)
 2590          *      [5] channel switch announcement (CSA) (optional)
 2591          *      [tlv] extended rate phy (ERP)
 2592          *      [tlv] extended supported rates
 2593          *      [tlv] RSN (optional)
 2594          *      [tlv] HT capabilities
 2595          *      [tlv] HT information
 2596          *      [tlv] WPA (optional)
 2597          *      [tlv] WME (optional)
 2598          *      [tlv] Vendor OUI HT capabilities (optional)
 2599          *      [tlv] Vendor OUI HT information (optional)
 2600          *      [tlv] Atheros capabilities
 2601          *      [tlv] AppIE's (optional)
 2602          *      [tlv] Mesh ID (MBSS)
 2603          *      [tlv] Mesh Conf (MBSS)
 2604          */
 2605         m = ieee80211_getmgtframe(&frm,
 2606                  ic->ic_headroom + sizeof(struct ieee80211_frame),
 2607                  8
 2608                + sizeof(uint16_t)
 2609                + sizeof(uint16_t)
 2610                + 2 + IEEE80211_NWID_LEN
 2611                + 2 + IEEE80211_RATE_SIZE
 2612                + 7      /* max(7,3) */
 2613                + IEEE80211_COUNTRY_MAX_SIZE
 2614                + 3
 2615                + sizeof(struct ieee80211_csa_ie)
 2616                + sizeof(struct ieee80211_quiet_ie)
 2617                + 3
 2618                + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 2619                + sizeof(struct ieee80211_ie_wpa)
 2620                + sizeof(struct ieee80211_ie_htcap)
 2621                + sizeof(struct ieee80211_ie_htinfo)
 2622                + sizeof(struct ieee80211_ie_wpa)
 2623                + sizeof(struct ieee80211_wme_param)
 2624                + 4 + sizeof(struct ieee80211_ie_htcap)
 2625                + 4 + sizeof(struct ieee80211_ie_htinfo)
 2626 #ifdef IEEE80211_SUPPORT_SUPERG
 2627                + sizeof(struct ieee80211_ath_ie)
 2628 #endif
 2629 #ifdef IEEE80211_SUPPORT_MESH
 2630                + 2 + IEEE80211_MESHID_LEN
 2631                + sizeof(struct ieee80211_meshconf_ie)
 2632 #endif
 2633                + (vap->iv_appie_proberesp != NULL ?
 2634                         vap->iv_appie_proberesp->ie_len : 0)
 2635         );
 2636         if (m == NULL) {
 2637                 vap->iv_stats.is_tx_nobuf++;
 2638                 return NULL;
 2639         }
 2640 
 2641         memset(frm, 0, 8);      /* timestamp should be filled later */
 2642         frm += 8;
 2643         *(uint16_t *)frm = htole16(bss->ni_intval);
 2644         frm += 2;
 2645         capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
 2646         *(uint16_t *)frm = htole16(capinfo);
 2647         frm += 2;
 2648 
 2649         frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen);
 2650         rs = ieee80211_get_suprates(ic, bss->ni_chan);
 2651         frm = ieee80211_add_rates(frm, rs);
 2652 
 2653         if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) {
 2654                 *frm++ = IEEE80211_ELEMID_FHPARMS;
 2655                 *frm++ = 5;
 2656                 *frm++ = bss->ni_fhdwell & 0x00ff;
 2657                 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff;
 2658                 *frm++ = IEEE80211_FH_CHANSET(
 2659                     ieee80211_chan2ieee(ic, bss->ni_chan));
 2660                 *frm++ = IEEE80211_FH_CHANPAT(
 2661                     ieee80211_chan2ieee(ic, bss->ni_chan));
 2662                 *frm++ = bss->ni_fhindex;
 2663         } else {
 2664                 *frm++ = IEEE80211_ELEMID_DSPARMS;
 2665                 *frm++ = 1;
 2666                 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan);
 2667         }
 2668 
 2669         if (vap->iv_opmode == IEEE80211_M_IBSS) {
 2670                 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
 2671                 *frm++ = 2;
 2672                 *frm++ = 0; *frm++ = 0;         /* TODO: ATIM window */
 2673         }
 2674         if ((vap->iv_flags & IEEE80211_F_DOTH) ||
 2675             (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
 2676                 frm = ieee80211_add_countryie(frm, ic);
 2677         if (vap->iv_flags & IEEE80211_F_DOTH) {
 2678                 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan))
 2679                         frm = ieee80211_add_powerconstraint(frm, vap);
 2680                 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
 2681                         frm = ieee80211_add_csa(frm, vap);
 2682         }
 2683         if (vap->iv_flags & IEEE80211_F_DOTH) {
 2684                 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
 2685                     (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
 2686                         if (vap->iv_quiet)
 2687                                 frm = ieee80211_add_quiet(frm, vap);
 2688                 }
 2689         }
 2690         if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan))
 2691                 frm = ieee80211_add_erp(frm, ic);
 2692         frm = ieee80211_add_xrates(frm, rs);
 2693         frm = ieee80211_add_rsn(frm, vap);
 2694         /*
 2695          * NB: legacy 11b clients do not get certain ie's.
 2696          *     The caller identifies such clients by passing
 2697          *     a token in legacy to us.  Could expand this to be
 2698          *     any legacy client for stuff like HT ie's.
 2699          */
 2700         if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
 2701             legacy != IEEE80211_SEND_LEGACY_11B) {
 2702                 frm = ieee80211_add_htcap(frm, bss);
 2703                 frm = ieee80211_add_htinfo(frm, bss);
 2704         }
 2705         frm = ieee80211_add_wpa(frm, vap);
 2706         if (vap->iv_flags & IEEE80211_F_WME)
 2707                 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
 2708         if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
 2709             (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) &&
 2710             legacy != IEEE80211_SEND_LEGACY_11B) {
 2711                 frm = ieee80211_add_htcap_vendor(frm, bss);
 2712                 frm = ieee80211_add_htinfo_vendor(frm, bss);
 2713         }
 2714 #ifdef IEEE80211_SUPPORT_SUPERG
 2715         if ((vap->iv_flags & IEEE80211_F_ATHEROS) &&
 2716             legacy != IEEE80211_SEND_LEGACY_11B)
 2717                 frm = ieee80211_add_athcaps(frm, bss);
 2718 #endif
 2719         if (vap->iv_appie_proberesp != NULL)
 2720                 frm = add_appie(frm, vap->iv_appie_proberesp);
 2721 #ifdef IEEE80211_SUPPORT_MESH
 2722         if (vap->iv_opmode == IEEE80211_M_MBSS) {
 2723                 frm = ieee80211_add_meshid(frm, vap);
 2724                 frm = ieee80211_add_meshconf(frm, vap);
 2725         }
 2726 #endif
 2727         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 2728 
 2729         return m;
 2730 }
 2731 
 2732 /*
 2733  * Send a probe response frame to the specified mac address.
 2734  * This does not go through the normal mgt frame api so we
 2735  * can specify the destination address and re-use the bss node
 2736  * for the sta reference.
 2737  */
 2738 int
 2739 ieee80211_send_proberesp(struct ieee80211vap *vap,
 2740         const uint8_t da[IEEE80211_ADDR_LEN], int legacy)
 2741 {
 2742         struct ieee80211_node *bss = vap->iv_bss;
 2743         struct ieee80211com *ic = vap->iv_ic;
 2744         struct mbuf *m;
 2745         int ret;
 2746 
 2747         if (vap->iv_state == IEEE80211_S_CAC) {
 2748                 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss,
 2749                     "block %s frame in CAC state", "probe response");
 2750                 vap->iv_stats.is_tx_badstate++;
 2751                 return EIO;             /* XXX */
 2752         }
 2753 
 2754         /*
 2755          * Hold a reference on the node so it doesn't go away until after
 2756          * the xmit is complete all the way in the driver.  On error we
 2757          * will remove our reference.
 2758          */
 2759         IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
 2760             "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
 2761             __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr),
 2762             ieee80211_node_refcnt(bss)+1);
 2763         ieee80211_ref_node(bss);
 2764 
 2765         m = ieee80211_alloc_proberesp(bss, legacy);
 2766         if (m == NULL) {
 2767                 ieee80211_free_node(bss);
 2768                 return ENOMEM;
 2769         }
 2770 
 2771         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
 2772         KASSERT(m != NULL, ("no room for header"));
 2773 
 2774         IEEE80211_TX_LOCK(ic);
 2775         ieee80211_send_setup(bss, m,
 2776              IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP,
 2777              IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid);
 2778         /* XXX power management? */
 2779         m->m_flags |= M_ENCAP;          /* mark encapsulated */
 2780 
 2781         M_WME_SETAC(m, WME_AC_BE);
 2782 
 2783         IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
 2784             "send probe resp on channel %u to %s%s\n",
 2785             ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da),
 2786             legacy ? " <legacy>" : "");
 2787         IEEE80211_NODE_STAT(bss, tx_mgmt);
 2788 
 2789         ret = ieee80211_raw_output(vap, bss, m, NULL);
 2790         IEEE80211_TX_UNLOCK(ic);
 2791         return (ret);
 2792 }
 2793 
 2794 /*
 2795  * Allocate and build a RTS (Request To Send) control frame.
 2796  */
 2797 struct mbuf *
 2798 ieee80211_alloc_rts(struct ieee80211com *ic,
 2799         const uint8_t ra[IEEE80211_ADDR_LEN],
 2800         const uint8_t ta[IEEE80211_ADDR_LEN],
 2801         uint16_t dur)
 2802 {
 2803         struct ieee80211_frame_rts *rts;
 2804         struct mbuf *m;
 2805 
 2806         /* XXX honor ic_headroom */
 2807         m = m_gethdr(M_NOWAIT, MT_DATA);
 2808         if (m != NULL) {
 2809                 rts = mtod(m, struct ieee80211_frame_rts *);
 2810                 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2811                         IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS;
 2812                 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 2813                 *(u_int16_t *)rts->i_dur = htole16(dur);
 2814                 IEEE80211_ADDR_COPY(rts->i_ra, ra);
 2815                 IEEE80211_ADDR_COPY(rts->i_ta, ta);
 2816 
 2817                 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts);
 2818         }
 2819         return m;
 2820 }
 2821 
 2822 /*
 2823  * Allocate and build a CTS (Clear To Send) control frame.
 2824  */
 2825 struct mbuf *
 2826 ieee80211_alloc_cts(struct ieee80211com *ic,
 2827         const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur)
 2828 {
 2829         struct ieee80211_frame_cts *cts;
 2830         struct mbuf *m;
 2831 
 2832         /* XXX honor ic_headroom */
 2833         m = m_gethdr(M_NOWAIT, MT_DATA);
 2834         if (m != NULL) {
 2835                 cts = mtod(m, struct ieee80211_frame_cts *);
 2836                 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
 2837                         IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS;
 2838                 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 2839                 *(u_int16_t *)cts->i_dur = htole16(dur);
 2840                 IEEE80211_ADDR_COPY(cts->i_ra, ra);
 2841 
 2842                 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts);
 2843         }
 2844         return m;
 2845 }
 2846 
 2847 static void
 2848 ieee80211_tx_mgt_timeout(void *arg)
 2849 {
 2850         struct ieee80211vap *vap = arg;
 2851 
 2852         IEEE80211_LOCK(vap->iv_ic);
 2853         if (vap->iv_state != IEEE80211_S_INIT &&
 2854             (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
 2855                 /*
 2856                  * NB: it's safe to specify a timeout as the reason here;
 2857                  *     it'll only be used in the right state.
 2858                  */
 2859                 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN,
 2860                         IEEE80211_SCAN_FAIL_TIMEOUT);
 2861         }
 2862         IEEE80211_UNLOCK(vap->iv_ic);
 2863 }
 2864 
 2865 /*
 2866  * This is the callback set on net80211-sourced transmitted
 2867  * authentication request frames.
 2868  *
 2869  * This does a couple of things:
 2870  *
 2871  * + If the frame transmitted was a success, it schedules a future
 2872  *   event which will transition the interface to scan.
 2873  *   If a state transition _then_ occurs before that event occurs,
 2874  *   said state transition will cancel this callout.
 2875  *
 2876  * + If the frame transmit was a failure, it immediately schedules
 2877  *   the transition back to scan.
 2878  */
 2879 static void
 2880 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status)
 2881 {
 2882         struct ieee80211vap *vap = ni->ni_vap;
 2883         enum ieee80211_state ostate = (enum ieee80211_state) arg;
 2884 
 2885         /*
 2886          * Frame transmit completed; arrange timer callback.  If
 2887          * transmit was successfully we wait for response.  Otherwise
 2888          * we arrange an immediate callback instead of doing the
 2889          * callback directly since we don't know what state the driver
 2890          * is in (e.g. what locks it is holding).  This work should
 2891          * not be too time-critical and not happen too often so the
 2892          * added overhead is acceptable.
 2893          *
 2894          * XXX what happens if !acked but response shows up before callback?
 2895          */
 2896         if (vap->iv_state == ostate) {
 2897                 callout_reset(&vap->iv_mgtsend,
 2898                         status == 0 ? IEEE80211_TRANS_WAIT*hz : 0,
 2899                         ieee80211_tx_mgt_timeout, vap);
 2900         }
 2901 }
 2902 
 2903 static void
 2904 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm,
 2905         struct ieee80211_node *ni)
 2906 {
 2907         struct ieee80211vap *vap = ni->ni_vap;
 2908         struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
 2909         struct ieee80211com *ic = ni->ni_ic;
 2910         struct ieee80211_rateset *rs = &ni->ni_rates;
 2911         uint16_t capinfo;
 2912 
 2913         /*
 2914          * beacon frame format
 2915          *      [8] time stamp
 2916          *      [2] beacon interval
 2917          *      [2] cabability information
 2918          *      [tlv] ssid
 2919          *      [tlv] supported rates
 2920          *      [3] parameter set (DS)
 2921          *      [8] CF parameter set (optional)
 2922          *      [tlv] parameter set (IBSS/TIM)
 2923          *      [tlv] country (optional)
 2924          *      [3] power control (optional)
 2925          *      [5] channel switch announcement (CSA) (optional)
 2926          *      [tlv] extended rate phy (ERP)
 2927          *      [tlv] extended supported rates
 2928          *      [tlv] RSN parameters
 2929          *      [tlv] HT capabilities
 2930          *      [tlv] HT information
 2931          * XXX Vendor-specific OIDs (e.g. Atheros)
 2932          *      [tlv] WPA parameters
 2933          *      [tlv] WME parameters
 2934          *      [tlv] Vendor OUI HT capabilities (optional)
 2935          *      [tlv] Vendor OUI HT information (optional)
 2936          *      [tlv] Atheros capabilities (optional)
 2937          *      [tlv] TDMA parameters (optional)
 2938          *      [tlv] Mesh ID (MBSS)
 2939          *      [tlv] Mesh Conf (MBSS)
 2940          *      [tlv] application data (optional)
 2941          */
 2942 
 2943         memset(bo, 0, sizeof(*bo));
 2944 
 2945         memset(frm, 0, 8);      /* XXX timestamp is set by hardware/driver */
 2946         frm += 8;
 2947         *(uint16_t *)frm = htole16(ni->ni_intval);
 2948         frm += 2;
 2949         capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
 2950         bo->bo_caps = (uint16_t *)frm;
 2951         *(uint16_t *)frm = htole16(capinfo);
 2952         frm += 2;
 2953         *frm++ = IEEE80211_ELEMID_SSID;
 2954         if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
 2955                 *frm++ = ni->ni_esslen;
 2956                 memcpy(frm, ni->ni_essid, ni->ni_esslen);
 2957                 frm += ni->ni_esslen;
 2958         } else
 2959                 *frm++ = 0;
 2960         frm = ieee80211_add_rates(frm, rs);
 2961         if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) {
 2962                 *frm++ = IEEE80211_ELEMID_DSPARMS;
 2963                 *frm++ = 1;
 2964                 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
 2965         }
 2966         if (ic->ic_flags & IEEE80211_F_PCF) {
 2967                 bo->bo_cfp = frm;
 2968                 frm = ieee80211_add_cfparms(frm, ic);
 2969         }
 2970         bo->bo_tim = frm;
 2971         if (vap->iv_opmode == IEEE80211_M_IBSS) {
 2972                 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
 2973                 *frm++ = 2;
 2974                 *frm++ = 0; *frm++ = 0;         /* TODO: ATIM window */
 2975                 bo->bo_tim_len = 0;
 2976         } else if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
 2977             vap->iv_opmode == IEEE80211_M_MBSS) {
 2978                 /* TIM IE is the same for Mesh and Hostap */
 2979                 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
 2980 
 2981                 tie->tim_ie = IEEE80211_ELEMID_TIM;
 2982                 tie->tim_len = 4;       /* length */
 2983                 tie->tim_count = 0;     /* DTIM count */ 
 2984                 tie->tim_period = vap->iv_dtim_period;  /* DTIM period */
 2985                 tie->tim_bitctl = 0;    /* bitmap control */
 2986                 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
 2987                 frm += sizeof(struct ieee80211_tim_ie);
 2988                 bo->bo_tim_len = 1;
 2989         }
 2990         bo->bo_tim_trailer = frm;
 2991         if ((vap->iv_flags & IEEE80211_F_DOTH) ||
 2992             (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
 2993                 frm = ieee80211_add_countryie(frm, ic);
 2994         if (vap->iv_flags & IEEE80211_F_DOTH) {
 2995                 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
 2996                         frm = ieee80211_add_powerconstraint(frm, vap);
 2997                 bo->bo_csa = frm;
 2998                 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
 2999                         frm = ieee80211_add_csa(frm, vap);      
 3000         } else
 3001                 bo->bo_csa = frm;
 3002 
 3003         if (vap->iv_flags & IEEE80211_F_DOTH) {
 3004                 bo->bo_quiet = frm;
 3005                 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
 3006                     (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
 3007                         if (vap->iv_quiet)
 3008                                 frm = ieee80211_add_quiet(frm,vap);
 3009                 }
 3010         } else
 3011                 bo->bo_quiet = frm;
 3012 
 3013         if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) {
 3014                 bo->bo_erp = frm;
 3015                 frm = ieee80211_add_erp(frm, ic);
 3016         }
 3017         frm = ieee80211_add_xrates(frm, rs);
 3018         frm = ieee80211_add_rsn(frm, vap);
 3019         if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
 3020                 frm = ieee80211_add_htcap(frm, ni);
 3021                 bo->bo_htinfo = frm;
 3022                 frm = ieee80211_add_htinfo(frm, ni);
 3023         }
 3024         frm = ieee80211_add_wpa(frm, vap);
 3025         if (vap->iv_flags & IEEE80211_F_WME) {
 3026                 bo->bo_wme = frm;
 3027                 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
 3028         }
 3029         if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
 3030             (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) {
 3031                 frm = ieee80211_add_htcap_vendor(frm, ni);
 3032                 frm = ieee80211_add_htinfo_vendor(frm, ni);
 3033         }
 3034 #ifdef IEEE80211_SUPPORT_SUPERG
 3035         if (vap->iv_flags & IEEE80211_F_ATHEROS) {
 3036                 bo->bo_ath = frm;
 3037                 frm = ieee80211_add_athcaps(frm, ni);
 3038         }
 3039 #endif
 3040 #ifdef IEEE80211_SUPPORT_TDMA
 3041         if (vap->iv_caps & IEEE80211_C_TDMA) {
 3042                 bo->bo_tdma = frm;
 3043                 frm = ieee80211_add_tdma(frm, vap);
 3044         }
 3045 #endif
 3046         if (vap->iv_appie_beacon != NULL) {
 3047                 bo->bo_appie = frm;
 3048                 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
 3049                 frm = add_appie(frm, vap->iv_appie_beacon);
 3050         }
 3051 #ifdef IEEE80211_SUPPORT_MESH
 3052         if (vap->iv_opmode == IEEE80211_M_MBSS) {
 3053                 frm = ieee80211_add_meshid(frm, vap);
 3054                 bo->bo_meshconf = frm;
 3055                 frm = ieee80211_add_meshconf(frm, vap);
 3056         }
 3057 #endif
 3058         bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
 3059         bo->bo_csa_trailer_len = frm - bo->bo_csa;
 3060         m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
 3061 }
 3062 
 3063 /*
 3064  * Allocate a beacon frame and fillin the appropriate bits.
 3065  */
 3066 struct mbuf *
 3067 ieee80211_beacon_alloc(struct ieee80211_node *ni)
 3068 {
 3069         struct ieee80211vap *vap = ni->ni_vap;
 3070         struct ieee80211com *ic = ni->ni_ic;
 3071         struct ifnet *ifp = vap->iv_ifp;
 3072         struct ieee80211_frame *wh;
 3073         struct mbuf *m;
 3074         int pktlen;
 3075         uint8_t *frm;
 3076 
 3077         /*
 3078          * beacon frame format
 3079          *      [8] time stamp
 3080          *      [2] beacon interval
 3081          *      [2] cabability information
 3082          *      [tlv] ssid
 3083          *      [tlv] supported rates
 3084          *      [3] parameter set (DS)
 3085          *      [8] CF parameter set (optional)
 3086          *      [tlv] parameter set (IBSS/TIM)
 3087          *      [tlv] country (optional)
 3088          *      [3] power control (optional)
 3089          *      [5] channel switch announcement (CSA) (optional)
 3090          *      [tlv] extended rate phy (ERP)
 3091          *      [tlv] extended supported rates
 3092          *      [tlv] RSN parameters
 3093          *      [tlv] HT capabilities
 3094          *      [tlv] HT information
 3095          *      [tlv] Vendor OUI HT capabilities (optional)
 3096          *      [tlv] Vendor OUI HT information (optional)
 3097          * XXX Vendor-specific OIDs (e.g. Atheros)
 3098          *      [tlv] WPA parameters
 3099          *      [tlv] WME parameters
 3100          *      [tlv] TDMA parameters (optional)
 3101          *      [tlv] Mesh ID (MBSS)
 3102          *      [tlv] Mesh Conf (MBSS)
 3103          *      [tlv] application data (optional)
 3104          * NB: we allocate the max space required for the TIM bitmap.
 3105          * XXX how big is this?
 3106          */
 3107         pktlen =   8                                    /* time stamp */
 3108                  + sizeof(uint16_t)                     /* beacon interval */
 3109                  + sizeof(uint16_t)                     /* capabilities */
 3110                  + 2 + ni->ni_esslen                    /* ssid */
 3111                  + 2 + IEEE80211_RATE_SIZE              /* supported rates */
 3112                  + 2 + 1                                /* DS parameters */
 3113                  + 2 + 6                                /* CF parameters */
 3114                  + 2 + 4 + vap->iv_tim_len              /* DTIM/IBSSPARMS */
 3115                  + IEEE80211_COUNTRY_MAX_SIZE           /* country */
 3116                  + 2 + 1                                /* power control */
 3117                  + sizeof(struct ieee80211_csa_ie)      /* CSA */
 3118                  + sizeof(struct ieee80211_quiet_ie)    /* Quiet */
 3119                  + 2 + 1                                /* ERP */
 3120                  + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
 3121                  + (vap->iv_caps & IEEE80211_C_WPA ?    /* WPA 1+2 */
 3122                         2*sizeof(struct ieee80211_ie_wpa) : 0)
 3123                  /* XXX conditional? */
 3124                  + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
 3125                  + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
 3126                  + (vap->iv_caps & IEEE80211_C_WME ?    /* WME */
 3127                         sizeof(struct ieee80211_wme_param) : 0)
 3128 #ifdef IEEE80211_SUPPORT_SUPERG
 3129                  + sizeof(struct ieee80211_ath_ie)      /* ATH */
 3130 #endif
 3131 #ifdef IEEE80211_SUPPORT_TDMA
 3132                  + (vap->iv_caps & IEEE80211_C_TDMA ?   /* TDMA */
 3133                         sizeof(struct ieee80211_tdma_param) : 0)
 3134 #endif
 3135 #ifdef IEEE80211_SUPPORT_MESH
 3136                  + 2 + ni->ni_meshidlen
 3137                  + sizeof(struct ieee80211_meshconf_ie)
 3138 #endif
 3139                  + IEEE80211_MAX_APPIE
 3140                  ;
 3141         m = ieee80211_getmgtframe(&frm,
 3142                 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
 3143         if (m == NULL) {
 3144                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
 3145                         "%s: cannot get buf; size %u\n", __func__, pktlen);
 3146                 vap->iv_stats.is_tx_nobuf++;
 3147                 return NULL;
 3148         }
 3149         ieee80211_beacon_construct(m, frm, ni);
 3150 
 3151         M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
 3152         KASSERT(m != NULL, ("no space for 802.11 header?"));
 3153         wh = mtod(m, struct ieee80211_frame *);
 3154         wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
 3155             IEEE80211_FC0_SUBTYPE_BEACON;
 3156         wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
 3157         *(uint16_t *)wh->i_dur = 0;
 3158         IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
 3159         IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
 3160         IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
 3161         *(uint16_t *)wh->i_seq = 0;
 3162 
 3163         return m;
 3164 }
 3165 
 3166 /*
 3167  * Update the dynamic parts of a beacon frame based on the current state.
 3168  */
 3169 int
 3170 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast)
 3171 {
 3172         struct ieee80211vap *vap = ni->ni_vap;
 3173         struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
 3174         struct ieee80211com *ic = ni->ni_ic;
 3175         int len_changed = 0;
 3176         uint16_t capinfo;
 3177         struct ieee80211_frame *wh;
 3178         ieee80211_seq seqno;
 3179 
 3180         IEEE80211_LOCK(ic);
 3181         /*
 3182          * Handle 11h channel change when we've reached the count.
 3183          * We must recalculate the beacon frame contents to account
 3184          * for the new channel.  Note we do this only for the first
 3185          * vap that reaches this point; subsequent vaps just update
 3186          * their beacon state to reflect the recalculated channel.
 3187          */
 3188         if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
 3189             vap->iv_csa_count == ic->ic_csa_count) {
 3190                 vap->iv_csa_count = 0;
 3191                 /*
 3192                  * Effect channel change before reconstructing the beacon
 3193                  * frame contents as many places reference ni_chan.
 3194                  */
 3195                 if (ic->ic_csa_newchan != NULL)
 3196                         ieee80211_csa_completeswitch(ic);
 3197                 /*
 3198                  * NB: ieee80211_beacon_construct clears all pending
 3199                  * updates in bo_flags so we don't need to explicitly
 3200                  * clear IEEE80211_BEACON_CSA.
 3201                  */
 3202                 ieee80211_beacon_construct(m,
 3203                     mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni);
 3204 
 3205                 /* XXX do WME aggressive mode processing? */
 3206                 IEEE80211_UNLOCK(ic);
 3207                 return 1;               /* just assume length changed */
 3208         }
 3209 
 3210         wh = mtod(m, struct ieee80211_frame *);
 3211         seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
 3212         *(uint16_t *)&wh->i_seq[0] =
 3213                 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
 3214         M_SEQNO_SET(m, seqno);
 3215 
 3216         /* XXX faster to recalculate entirely or just changes? */
 3217         capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
 3218         *bo->bo_caps = htole16(capinfo);
 3219 
 3220         if (vap->iv_flags & IEEE80211_F_WME) {
 3221                 struct ieee80211_wme_state *wme = &ic->ic_wme;
 3222 
 3223                 /*
 3224                  * Check for aggressive mode change.  When there is
 3225                  * significant high priority traffic in the BSS
 3226                  * throttle back BE traffic by using conservative
 3227                  * parameters.  Otherwise BE uses aggressive params
 3228                  * to optimize performance of legacy/non-QoS traffic.
 3229                  */
 3230                 if (wme->wme_flags & WME_F_AGGRMODE) {
 3231                         if (wme->wme_hipri_traffic >
 3232                             wme->wme_hipri_switch_thresh) {
 3233                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
 3234                                     "%s: traffic %u, disable aggressive mode\n",
 3235                                     __func__, wme->wme_hipri_traffic);
 3236                                 wme->wme_flags &= ~WME_F_AGGRMODE;
 3237                                 ieee80211_wme_updateparams_locked(vap);
 3238                                 wme->wme_hipri_traffic =
 3239                                         wme->wme_hipri_switch_hysteresis;
 3240                         } else
 3241                                 wme->wme_hipri_traffic = 0;
 3242                 } else {
 3243                         if (wme->wme_hipri_traffic <=
 3244                             wme->wme_hipri_switch_thresh) {
 3245                                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
 3246                                     "%s: traffic %u, enable aggressive mode\n",
 3247                                     __func__, wme->wme_hipri_traffic);
 3248                                 wme->wme_flags |= WME_F_AGGRMODE;
 3249                                 ieee80211_wme_updateparams_locked(vap);
 3250                                 wme->wme_hipri_traffic = 0;
 3251                         } else
 3252                                 wme->wme_hipri_traffic =
 3253                                         wme->wme_hipri_switch_hysteresis;
 3254                 }
 3255                 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
 3256                         (void) ieee80211_add_wme_param(bo->bo_wme, wme);
 3257                         clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
 3258                 }
 3259         }
 3260 
 3261         if (isset(bo->bo_flags,  IEEE80211_BEACON_HTINFO)) {
 3262                 ieee80211_ht_update_beacon(vap, bo);
 3263                 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
 3264         }
 3265 #ifdef IEEE80211_SUPPORT_TDMA
 3266         if (vap->iv_caps & IEEE80211_C_TDMA) {
 3267                 /*
 3268                  * NB: the beacon is potentially updated every TBTT.
 3269                  */
 3270                 ieee80211_tdma_update_beacon(vap, bo);
 3271         }
 3272 #endif
 3273 #ifdef IEEE80211_SUPPORT_MESH
 3274         if (vap->iv_opmode == IEEE80211_M_MBSS)
 3275                 ieee80211_mesh_update_beacon(vap, bo);
 3276 #endif
 3277 
 3278         if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
 3279             vap->iv_opmode == IEEE80211_M_MBSS) {       /* NB: no IBSS support*/
 3280                 struct ieee80211_tim_ie *tie =
 3281                         (struct ieee80211_tim_ie *) bo->bo_tim;
 3282                 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
 3283                         u_int timlen, timoff, i;
 3284                         /* 
 3285                          * ATIM/DTIM needs updating.  If it fits in the
 3286                          * current space allocated then just copy in the
 3287                          * new bits.  Otherwise we need to move any trailing
 3288                          * data to make room.  Note that we know there is
 3289                          * contiguous space because ieee80211_beacon_allocate
 3290                          * insures there is space in the mbuf to write a
 3291                          * maximal-size virtual bitmap (based on iv_max_aid).
 3292                          */
 3293                         /*
 3294                          * Calculate the bitmap size and offset, copy any
 3295                          * trailer out of the way, and then copy in the
 3296                          * new bitmap and update the information element.
 3297                          * Note that the tim bitmap must contain at least
 3298                          * one byte and any offset must be even.
 3299                          */
 3300                         if (vap->iv_ps_pending != 0) {
 3301                                 timoff = 128;           /* impossibly large */
 3302                                 for (i = 0; i < vap->iv_tim_len; i++)
 3303                                         if (vap->iv_tim_bitmap[i]) {
 3304                                                 timoff = i &~ 1;
 3305                                                 break;
 3306                                         }
 3307                                 KASSERT(timoff != 128, ("tim bitmap empty!"));
 3308                                 for (i = vap->iv_tim_len-1; i >= timoff; i--)
 3309                                         if (vap->iv_tim_bitmap[i])
 3310                                                 break;
 3311                                 timlen = 1 + (i - timoff);
 3312                         } else {
 3313                                 timoff = 0;
 3314                                 timlen = 1;
 3315                         }
 3316                         if (timlen != bo->bo_tim_len) {
 3317                                 /* copy up/down trailer */
 3318                                 int adjust = tie->tim_bitmap+timlen
 3319                                            - bo->bo_tim_trailer;
 3320                                 ovbcopy(bo->bo_tim_trailer,
 3321                                     bo->bo_tim_trailer+adjust,
 3322                                     bo->bo_tim_trailer_len);
 3323                                 bo->bo_tim_trailer += adjust;
 3324                                 bo->bo_erp += adjust;
 3325                                 bo->bo_htinfo += adjust;
 3326 #ifdef IEEE80211_SUPPORT_SUPERG
 3327                                 bo->bo_ath += adjust;
 3328 #endif
 3329 #ifdef IEEE80211_SUPPORT_TDMA
 3330                                 bo->bo_tdma += adjust;
 3331 #endif
 3332 #ifdef IEEE80211_SUPPORT_MESH
 3333                                 bo->bo_meshconf += adjust;
 3334 #endif
 3335                                 bo->bo_appie += adjust;
 3336                                 bo->bo_wme += adjust;
 3337                                 bo->bo_csa += adjust;
 3338                                 bo->bo_quiet += adjust;
 3339                                 bo->bo_tim_len = timlen;
 3340 
 3341                                 /* update information element */
 3342                                 tie->tim_len = 3 + timlen;
 3343                                 tie->tim_bitctl = timoff;
 3344                                 len_changed = 1;
 3345                         }
 3346                         memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
 3347                                 bo->bo_tim_len);
 3348 
 3349                         clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
 3350 
 3351                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
 3352                                 "%s: TIM updated, pending %u, off %u, len %u\n",
 3353                                 __func__, vap->iv_ps_pending, timoff, timlen);
 3354                 }
 3355                 /* count down DTIM period */
 3356                 if (tie->tim_count == 0)
 3357                         tie->tim_count = tie->tim_period - 1;
 3358                 else
 3359                         tie->tim_count--;
 3360                 /* update state for buffered multicast frames on DTIM */
 3361                 if (mcast && tie->tim_count == 0)
 3362                         tie->tim_bitctl |= 1;
 3363                 else
 3364                         tie->tim_bitctl &= ~1;
 3365                 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
 3366                         struct ieee80211_csa_ie *csa =
 3367                             (struct ieee80211_csa_ie *) bo->bo_csa;
 3368 
 3369                         /*
 3370                          * Insert or update CSA ie.  If we're just starting
 3371                          * to count down to the channel switch then we need
 3372                          * to insert the CSA ie.  Otherwise we just need to
 3373                          * drop the count.  The actual change happens above
 3374                          * when the vap's count reaches the target count.
 3375                          */
 3376                         if (vap->iv_csa_count == 0) {
 3377                                 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
 3378                                 bo->bo_erp += sizeof(*csa);
 3379                                 bo->bo_htinfo += sizeof(*csa);
 3380                                 bo->bo_wme += sizeof(*csa);
 3381 #ifdef IEEE80211_SUPPORT_SUPERG
 3382                                 bo->bo_ath += sizeof(*csa);
 3383 #endif
 3384 #ifdef IEEE80211_SUPPORT_TDMA
 3385                                 bo->bo_tdma += sizeof(*csa);
 3386 #endif
 3387 #ifdef IEEE80211_SUPPORT_MESH
 3388                                 bo->bo_meshconf += sizeof(*csa);
 3389 #endif
 3390                                 bo->bo_appie += sizeof(*csa);
 3391                                 bo->bo_csa_trailer_len += sizeof(*csa);
 3392                                 bo->bo_quiet += sizeof(*csa);
 3393                                 bo->bo_tim_trailer_len += sizeof(*csa);
 3394                                 m->m_len += sizeof(*csa);
 3395                                 m->m_pkthdr.len += sizeof(*csa);
 3396 
 3397                                 ieee80211_add_csa(bo->bo_csa, vap);
 3398                         } else
 3399                                 csa->csa_count--;
 3400                         vap->iv_csa_count++;
 3401                         /* NB: don't clear IEEE80211_BEACON_CSA */
 3402                 }
 3403                 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
 3404                     (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){
 3405                         if (vap->iv_quiet)
 3406                                 ieee80211_add_quiet(bo->bo_quiet, vap);
 3407                 }
 3408                 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
 3409                         /*
 3410                          * ERP element needs updating.
 3411                          */
 3412                         (void) ieee80211_add_erp(bo->bo_erp, ic);
 3413                         clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
 3414                 }
 3415 #ifdef IEEE80211_SUPPORT_SUPERG
 3416                 if (isset(bo->bo_flags,  IEEE80211_BEACON_ATH)) {
 3417                         ieee80211_add_athcaps(bo->bo_ath, ni);
 3418                         clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
 3419                 }
 3420 #endif
 3421         }
 3422         if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
 3423                 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
 3424                 int aielen;
 3425                 uint8_t *frm;
 3426 
 3427                 aielen = 0;
 3428                 if (aie != NULL)
 3429                         aielen += aie->ie_len;
 3430                 if (aielen != bo->bo_appie_len) {
 3431                         /* copy up/down trailer */
 3432                         int adjust = aielen - bo->bo_appie_len;
 3433                         ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
 3434                                 bo->bo_tim_trailer_len);
 3435                         bo->bo_tim_trailer += adjust;
 3436                         bo->bo_appie += adjust;
 3437                         bo->bo_appie_len = aielen;
 3438 
 3439                         len_changed = 1;
 3440                 }
 3441                 frm = bo->bo_appie;
 3442                 if (aie != NULL)
 3443                         frm  = add_appie(frm, aie);
 3444                 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
 3445         }
 3446         IEEE80211_UNLOCK(ic);
 3447 
 3448         return len_changed;
 3449 }
 3450 
 3451 /*
 3452  * Do Ethernet-LLC encapsulation for each payload in a fast frame
 3453  * tunnel encapsulation.  The frame is assumed to have an Ethernet
 3454  * header at the front that must be stripped before prepending the
 3455  * LLC followed by the Ethernet header passed in (with an Ethernet
 3456  * type that specifies the payload size).
 3457  */
 3458 struct mbuf *
 3459 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m,
 3460         const struct ether_header *eh)
 3461 {
 3462         struct llc *llc;
 3463         uint16_t payload;
 3464 
 3465         /* XXX optimize by combining m_adj+M_PREPEND */
 3466         m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
 3467         llc = mtod(m, struct llc *);
 3468         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
 3469         llc->llc_control = LLC_UI;
 3470         llc->llc_snap.org_code[0] = 0;
 3471         llc->llc_snap.org_code[1] = 0;
 3472         llc->llc_snap.org_code[2] = 0;
 3473         llc->llc_snap.ether_type = eh->ether_type;
 3474         payload = m->m_pkthdr.len;              /* NB: w/o Ethernet header */
 3475 
 3476         M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT);
 3477         if (m == NULL) {                /* XXX cannot happen */
 3478                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
 3479                         "%s: no space for ether_header\n", __func__);
 3480                 vap->iv_stats.is_tx_nobuf++;
 3481                 return NULL;
 3482         }
 3483         ETHER_HEADER_COPY(mtod(m, void *), eh);
 3484         mtod(m, struct ether_header *)->ether_type = htons(payload);
 3485         return m;
 3486 }
 3487 
 3488 /*
 3489  * Complete an mbuf transmission.
 3490  *
 3491  * For now, this simply processes a completed frame after the
 3492  * driver has completed it's transmission and/or retransmission.
 3493  * It assumes the frame is an 802.11 encapsulated frame.
 3494  *
 3495  * Later on it will grow to become the exit path for a given frame
 3496  * from the driver and, depending upon how it's been encapsulated
 3497  * and already transmitted, it may end up doing A-MPDU retransmission,
 3498  * power save requeuing, etc.
 3499  *
 3500  * In order for the above to work, the driver entry point to this
 3501  * must not hold any driver locks.  Thus, the driver needs to delay
 3502  * any actual mbuf completion until it can release said locks.
 3503  *
 3504  * This frees the mbuf and if the mbuf has a node reference,
 3505  * the node reference will be freed.
 3506  */
 3507 void
 3508 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status)
 3509 {
 3510 
 3511         if (ni != NULL) {
 3512                 struct ifnet *ifp = ni->ni_vap->iv_ifp;
 3513 
 3514                 if (status == 0) {
 3515                         if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
 3516                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 3517                         if (m->m_flags & M_MCAST)
 3518                                 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
 3519                 } else
 3520                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 3521                 if (m->m_flags & M_TXCB)
 3522                         ieee80211_process_callback(ni, m, status);
 3523                 ieee80211_free_node(ni);
 3524         }
 3525         m_freem(m);
 3526 }

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