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_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 } 139