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


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_monitor.c

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    1 /*-
    2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 #ifdef __FreeBSD__
   28 __FBSDID("$FreeBSD: releng/10.0/sys/net80211/ieee80211_monitor.c 193287 2009-06-02 00:04:10Z sam $");
   29 #endif
   30 
   31 /*
   32  * IEEE 802.11 Monitor mode support.
   33  */
   34 #include "opt_inet.h"
   35 #include "opt_wlan.h"
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h> 
   39 #include <sys/mbuf.h>   
   40 #include <sys/malloc.h>
   41 #include <sys/kernel.h>
   42 
   43 #include <sys/socket.h>
   44 #include <sys/sockio.h>
   45 #include <sys/endian.h>
   46 #include <sys/errno.h>
   47 #include <sys/proc.h>
   48 #include <sys/sysctl.h>
   49 
   50 #include <net/if.h>
   51 #include <net/if_media.h>
   52 #include <net/if_llc.h>
   53 #include <net/ethernet.h>
   54 
   55 #include <net/bpf.h>
   56 
   57 #include <net80211/ieee80211_var.h>
   58 #include <net80211/ieee80211_monitor.h>
   59 
   60 static void monitor_vattach(struct ieee80211vap *);
   61 static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int);
   62 static int monitor_input(struct ieee80211_node *ni, struct mbuf *m,
   63         int rssi, int nf);
   64 
   65 void
   66 ieee80211_monitor_attach(struct ieee80211com *ic)
   67 {
   68         ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach;
   69 }
   70 
   71 void
   72 ieee80211_monitor_detach(struct ieee80211com *ic)
   73 {
   74 }
   75 
   76 static void
   77 monitor_vdetach(struct ieee80211vap *vap)
   78 {
   79 }
   80 
   81 static void
   82 monitor_vattach(struct ieee80211vap *vap)
   83 {
   84         vap->iv_newstate = monitor_newstate;
   85         vap->iv_input = monitor_input;
   86         vap->iv_opdetach = monitor_vdetach;
   87 }
   88 
   89 /*
   90  * IEEE80211_M_MONITOR vap state machine handler.
   91  */
   92 static int
   93 monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
   94 {
   95         struct ieee80211com *ic = vap->iv_ic;
   96         enum ieee80211_state ostate;
   97 
   98         IEEE80211_LOCK_ASSERT(ic);
   99 
  100         ostate = vap->iv_state;
  101         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
  102             __func__, ieee80211_state_name[ostate],
  103             ieee80211_state_name[nstate], arg);
  104         vap->iv_state = nstate;                 /* state transition */
  105         if (nstate == IEEE80211_S_RUN) {
  106                 switch (ostate) {
  107                 case IEEE80211_S_INIT:
  108                         ieee80211_create_ibss(vap, ic->ic_curchan);
  109                         break;
  110                 default:
  111                         break;
  112                 }
  113                 /*
  114                  * NB: this shouldn't be here but many people use
  115                  * monitor mode for raw packets; once we switch
  116                  * them over to adhoc demo mode remove this.
  117                  */
  118                 ieee80211_node_authorize(vap->iv_bss);
  119         }
  120         return 0;
  121 }
  122 
  123 /*
  124  * Process a received frame in monitor mode.
  125  */
  126 static int
  127 monitor_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
  128 {
  129         struct ieee80211vap *vap = ni->ni_vap;
  130         struct ifnet *ifp = vap->iv_ifp;
  131 
  132         ifp->if_ipackets++;
  133 
  134         if (ieee80211_radiotap_active_vap(vap))
  135                 ieee80211_radiotap_rx(vap, m);
  136         m_freem(m);
  137         return -1;
  138 }

Cache object: c00b36923753f5cdaf6ccd884b732570


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