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 <net80211/ieee80211_var.h> 59 #include <net80211/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 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, int rssi, int nf) 129 { 130 struct ieee80211vap *vap = ni->ni_vap; 131 struct ifnet *ifp = vap->iv_ifp; 132 133 ifp->if_ipackets++; 134 135 if (ieee80211_radiotap_active_vap(vap)) 136 ieee80211_radiotap_rx(vap, m); 137 m_freem(m); 138 return -1; 139 } 140