1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #ifdef __FreeBSD__ 30 __FBSDID("$FreeBSD$"); 31 #endif 32 33 /* 34 * IEEE 802.11 Monitor mode support. 35 */ 36 #include "opt_inet.h" 37 #include "opt_wlan.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/malloc.h> 43 #include <sys/kernel.h> 44 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/endian.h> 48 #include <sys/errno.h> 49 #include <sys/proc.h> 50 #include <sys/sysctl.h> 51 52 #include <net/if.h> 53 #include <net/if_var.h> 54 #include <net/if_media.h> 55 #include <net/if_llc.h> 56 #include <net/ethernet.h> 57 58 #include <net/bpf.h> 59 60 #include <net80211/ieee80211_var.h> 61 #include <net80211/ieee80211_monitor.h> 62 63 static void monitor_vattach(struct ieee80211vap *); 64 static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int); 65 static int monitor_input(struct ieee80211_node *ni, struct mbuf *m, 66 const struct ieee80211_rx_stats *rxs, int rssi, int nf); 67 68 void 69 ieee80211_monitor_attach(struct ieee80211com *ic) 70 { 71 ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach; 72 } 73 74 void 75 ieee80211_monitor_detach(struct ieee80211com *ic) 76 { 77 } 78 79 static void 80 monitor_vdetach(struct ieee80211vap *vap) 81 { 82 } 83 84 static void 85 monitor_vattach(struct ieee80211vap *vap) 86 { 87 vap->iv_newstate = monitor_newstate; 88 vap->iv_input = monitor_input; 89 vap->iv_opdetach = monitor_vdetach; 90 } 91 92 /* 93 * IEEE80211_M_MONITOR vap state machine handler. 94 */ 95 static int 96 monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 97 { 98 struct ieee80211com *ic = vap->iv_ic; 99 enum ieee80211_state ostate; 100 101 IEEE80211_LOCK_ASSERT(ic); 102 103 ostate = vap->iv_state; 104 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 105 __func__, ieee80211_state_name[ostate], 106 ieee80211_state_name[nstate], arg); 107 vap->iv_state = nstate; /* state transition */ 108 if (nstate == IEEE80211_S_RUN) { 109 switch (ostate) { 110 case IEEE80211_S_INIT: 111 ieee80211_create_ibss(vap, ic->ic_curchan); 112 break; 113 default: 114 break; 115 } 116 /* 117 * NB: this shouldn't be here but many people use 118 * monitor mode for raw packets; once we switch 119 * them over to adhoc demo mode remove this. 120 */ 121 ieee80211_node_authorize(vap->iv_bss); 122 } 123 return 0; 124 } 125 126 /* 127 * Process a received frame in monitor mode. 128 */ 129 static int 130 monitor_input(struct ieee80211_node *ni, struct mbuf *m, 131 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 132 { 133 struct ieee80211vap *vap = ni->ni_vap; 134 struct ifnet *ifp = vap->iv_ifp; 135 136 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 137 138 if (ieee80211_radiotap_active_vap(vap)) 139 ieee80211_radiotap_rx(vap, m); 140 m_freem(m); 141 return -1; 142 } 143