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

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    #ifdef __FreeBSD__
    __FBSDID("$FreeBSD$");
    #endif
    
    /*
     * IEEE 802.11 Monitor mode support.
     */
    #include "opt_inet.h"
    #include "opt_wlan.h"
    
    #include <sys/param.h>
    #include <sys/systm.h> 
    #include <sys/mbuf.h>   
    #include <sys/malloc.h>
    #include <sys/kernel.h>
    
    #include <sys/socket.h>
    #include <sys/sockio.h>
    #include <sys/endian.h>
    #include <sys/errno.h>
    #include <sys/proc.h>
    #include <sys/sysctl.h>
    
    #include <net/if.h>
    #include <net/if_var.h>
    #include <net/if_media.h>
    #include <net/if_llc.h>
    #include <net/ethernet.h>
    
    #include <net/bpf.h>
    
    #include <net80211/ieee80211_var.h>
    #include <net80211/ieee80211_monitor.h>
    
    static void monitor_vattach(struct ieee80211vap *);
    static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int);
    static int monitor_input(struct ieee80211_node *ni, struct mbuf *m,
            const struct ieee80211_rx_stats *rxs, int rssi, int nf);
    
    void
    ieee80211_monitor_attach(struct ieee80211com *ic)
    {
            ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach;
    }
    
    void
    ieee80211_monitor_detach(struct ieee80211com *ic)
    {
    }
    
    static void
    monitor_vdetach(struct ieee80211vap *vap)
    {
    }
    
    static void
    monitor_vattach(struct ieee80211vap *vap)
    {
            vap->iv_newstate = monitor_newstate;
            vap->iv_input = monitor_input;
            vap->iv_opdetach = monitor_vdetach;
    }
    
    /*
     * IEEE80211_M_MONITOR vap state machine handler.
     */
    static int
    monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
    {
            struct ieee80211com *ic = vap->iv_ic;
            enum ieee80211_state ostate;
   
           IEEE80211_LOCK_ASSERT(ic);
   
           ostate = vap->iv_state;
           IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
               __func__, ieee80211_state_name[ostate],
               ieee80211_state_name[nstate], arg);
           vap->iv_state = nstate;                 /* state transition */
           if (nstate == IEEE80211_S_RUN) {
                   switch (ostate) {
                   case IEEE80211_S_INIT:
                           ieee80211_create_ibss(vap, ic->ic_curchan);
                           break;
                   default:
                           break;
                   }
                   /*
                    * NB: this shouldn't be here but many people use
                    * monitor mode for raw packets; once we switch
                    * them over to adhoc demo mode remove this.
                    */
                   ieee80211_node_authorize(vap->iv_bss);
           }
           return 0;
   }
   
   /*
    * Process a received frame in monitor mode.
    */
   static int
   monitor_input(struct ieee80211_node *ni, struct mbuf *m,
       const struct ieee80211_rx_stats *rxs, int rssi, int nf)
   {
           struct ieee80211vap *vap = ni->ni_vap;
           struct ifnet *ifp = vap->iv_ifp;
   
           if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
   
           if (ieee80211_radiotap_active_vap(vap))
                   ieee80211_radiotap_rx(vap, m);
           m_freem(m);
           return -1;
   }

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