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