1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #endif 31 32 /* 33 * IEEE 802.11 Monitor mode support. 34 */ 35 #include "opt_inet.h" 36 #include "opt_wlan.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/mbuf.h> 41 #include <sys/malloc.h> 42 #include <sys/kernel.h> 43 44 #include <sys/socket.h> 45 #include <sys/sockio.h> 46 #include <sys/endian.h> 47 #include <sys/errno.h> 48 #include <sys/proc.h> 49 #include <sys/sysctl.h> 50 51 #include <net/if.h> 52 #include <net/if_var.h> 53 #include <net/if_media.h> 54 #include <net/if_llc.h> 55 #include <net/ethernet.h> 56 57 #include <net/bpf.h> 58 59 #include <net80211/ieee80211_var.h> 60 #include <net80211/ieee80211_monitor.h> 61 62 static void monitor_vattach(struct ieee80211vap *); 63 static int monitor_newstate(struct ieee80211vap *, enum ieee80211_state, int); 64 static int monitor_input(struct ieee80211_node *ni, struct mbuf *m, 65 const struct ieee80211_rx_stats *rxs, int rssi, int nf); 66 67 void 68 ieee80211_monitor_attach(struct ieee80211com *ic) 69 { 70 ic->ic_vattach[IEEE80211_M_MONITOR] = monitor_vattach; 71 } 72 73 void 74 ieee80211_monitor_detach(struct ieee80211com *ic) 75 { 76 } 77 78 static void 79 monitor_vdetach(struct ieee80211vap *vap) 80 { 81 } 82 83 static void 84 monitor_vattach(struct ieee80211vap *vap) 85 { 86 vap->iv_newstate = monitor_newstate; 87 vap->iv_input = monitor_input; 88 vap->iv_opdetach = monitor_vdetach; 89 } 90 91 /* 92 * IEEE80211_M_MONITOR vap state machine handler. 93 */ 94 static int 95 monitor_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) 96 { 97 struct ieee80211com *ic = vap->iv_ic; 98 enum ieee80211_state ostate; 99 100 IEEE80211_LOCK_ASSERT(ic); 101 102 ostate = vap->iv_state; 103 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 104 __func__, ieee80211_state_name[ostate], 105 ieee80211_state_name[nstate], arg); 106 vap->iv_state = nstate; /* state transition */ 107 if (nstate == IEEE80211_S_RUN) { 108 switch (ostate) { 109 case IEEE80211_S_INIT: 110 ieee80211_create_ibss(vap, ic->ic_curchan); 111 break; 112 default: 113 break; 114 } 115 /* 116 * NB: this shouldn't be here but many people use 117 * monitor mode for raw packets; once we switch 118 * them over to adhoc demo mode remove this. 119 */ 120 ieee80211_node_authorize(vap->iv_bss); 121 } 122 return 0; 123 } 124 125 /* 126 * Process a received frame in monitor mode. 127 */ 128 static int 129 monitor_input(struct ieee80211_node *ni, struct mbuf *m, 130 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 131 { 132 struct ieee80211vap *vap = ni->ni_vap; 133 struct ifnet *ifp = vap->iv_ifp; 134 135 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 136 137 if (ieee80211_radiotap_active_vap(vap)) 138 ieee80211_radiotap_rx(vap, m); 139 m_freem(m); 140 return -1; 141 } 142