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 * $FreeBSD: head/sys/net80211/ieee80211_monitor.c 193287 2009-06-02 00:04:10Z sam $ 26 * $DragonFly$ 27 */ 28 29 /* 30 * IEEE 802.11 Monitor mode support. 31 */ 32 #include "opt_inet.h" 33 #include "opt_wlan.h" 34 35 #include <sys/param.h> 36 #include <sys/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/kernel.h> 40 41 #include <sys/socket.h> 42 #include <sys/sockio.h> 43 #include <sys/endian.h> 44 #include <sys/errno.h> 45 #include <sys/proc.h> 46 #include <sys/sysctl.h> 47 48 #include <net/if.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 #include <net/route.h> 53 54 #include <net/bpf.h> 55 56 #include <netproto/802_11/ieee80211_var.h> 57 #include <netproto/802_11/ieee80211_monitor.h> 58 59 static void monitor_vattach(struct ieee80211vap *); 60 static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int); 61 static int monitor_input(struct ieee80211_node *ni, struct mbuf *m, 62 int rssi, int nf); 63 64 void 65 ieee80211_monitor_attach(struct ieee80211com *ic) 66 { 67 ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach; 68 } 69 70 void 71 ieee80211_monitor_detach(struct ieee80211com *ic) 72 { 73 } 74 75 static void 76 monitor_vdetach(struct ieee80211vap *vap) 77 { 78 } 79 80 static void 81 monitor_vattach(struct ieee80211vap *vap) 82 { 83 vap->iv_newstate = monitor_newstate; 84 vap->iv_input = monitor_input; 85 vap->iv_opdetach = monitor_vdetach; 86 } 87 88 /* 89 * IEEE80211_M_MONITOR vap state machine handler. 90 */ 91 static int 92 monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 93 { 94 struct ieee80211com *ic = vap->iv_ic; 95 enum ieee80211_state ostate; 96 97 ostate = vap->iv_state; 98 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 99 __func__, ieee80211_state_name[ostate], 100 ieee80211_state_name[nstate], arg); 101 vap->iv_state = nstate; /* state transition */ 102 if (nstate == IEEE80211_S_RUN) { 103 switch (ostate) { 104 case IEEE80211_S_INIT: 105 ieee80211_create_ibss(vap, ic->ic_curchan); 106 break; 107 default: 108 break; 109 } 110 /* 111 * NB: this shouldn't be here but many people use 112 * monitor mode for raw packets; once we switch 113 * them over to adhoc demo mode remove this. 114 */ 115 ieee80211_node_authorize(vap->iv_bss); 116 } 117 return 0; 118 } 119 120 /* 121 * Process a received frame in monitor mode. 122 */ 123 static int 124 monitor_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) 125 { 126 struct ieee80211vap *vap = ni->ni_vap; 127 struct ifnet *ifp = vap->iv_ifp; 128 129 ifp->if_ipackets++; 130 131 if (ieee80211_radiotap_active_vap(vap)) 132 ieee80211_radiotap_rx(vap, m); 133 m_freem(m); 134 return -1; 135 } 136