sys/netproto/802_11/wlan/ieee80211_monitor.c

   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("$FreeBSD$");
  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_var.h>
  52 #include <net/if_media.h>
  53 #include <net/if_llc.h>
  54 #include <net/ethernet.h>
  55
  56 #include <net/bpf.h>
  57
  58 #include <netproto/802_11/ieee80211_var.h>
  59 #include <netproto/802_11/ieee80211_monitor.h>
  60
  61 static void monitor_vattach(struct ieee80211vap *);
  62 static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  63 static int monitor_input(struct ieee80211_node *ni, struct mbuf *m,
  64         const struct ieee80211_rx_stats *rxs, int rssi, int nf);
  65
  66 void
  67 ieee80211_monitor_attach(struct ieee80211com *ic)
  68 {
  69         ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach;
  70 }
  71
  72 void
  73 ieee80211_monitor_detach(struct ieee80211com *ic)
  74 {
  75 }
  76
  77 static void
  78 monitor_vdetach(struct ieee80211vap *vap)
  79 {
  80 }
  81
  82 static void
  83 monitor_vattach(struct ieee80211vap *vap)
  84 {
  85         vap->iv_newstate = monitor_newstate;
  86         vap->iv_input = monitor_input;
  87         vap->iv_opdetach = monitor_vdetach;
  88 }
  89
  90 /*
  91  * IEEE80211_M_MONITOR vap state machine handler.
  92  */
  93 static int
  94 monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
  95 {
  96         struct ieee80211com *ic = vap->iv_ic;
  97         enum ieee80211_state ostate;
  98
  99         IEEE80211_LOCK_ASSERT(ic);
 100
 101         ostate = vap->iv_state;
 102         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
 103             __func__, ieee80211_state_name[ostate],
 104             ieee80211_state_name[nstate], arg);
 105         vap->iv_state = nstate;                 /* state transition */
 106         if (nstate == IEEE80211_S_RUN) {
 107                 switch (ostate) {
 108                 case IEEE80211_S_INIT:
 109                         ieee80211_create_ibss(vap, ic->ic_curchan);
 110                         break;
 111                 default:
 112                         break;
 113                 }
 114                 /*
 115                  * NB: this shouldn't be here but many people use
 116                  * monitor mode for raw packets; once we switch
 117                  * them over to adhoc demo mode remove this.
 118                  */
 119                 ieee80211_node_authorize(vap->iv_bss);
 120         }
 121         return 0;
 122 }
 123
 124 /*
 125  * Process a received frame in monitor mode.
 126  */
 127 static int
 128 monitor_input(struct ieee80211_node *ni, struct mbuf *m,
 129     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 130 {
 131         struct ieee80211vap *vap = ni->ni_vap;
 132         struct ifnet *ifp = vap->iv_ifp;
 133
 134         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 135
 136         if (ieee80211_radiotap_active_vap(vap))
 137                 ieee80211_radiotap_rx(vap, m);
 138         m_freem(m);
 139         return -1;
 140 }