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 /* 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_var.h> 49 #include <net/if_media.h> 50 #include <net/if_llc.h> 51 #include <net/ethernet.h> 52 53 #include <net/bpf.h> 54 55 #include <net80211/ieee80211_var.h> 56 #include <net80211/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 const struct ieee80211_rx_stats *rxs, 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 IEEE80211_LOCK_ASSERT(ic); 97 98 ostate = vap->iv_state; 99 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", 100 __func__, ieee80211_state_name[ostate], 101 ieee80211_state_name[nstate], arg); 102 vap->iv_state = nstate; /* state transition */ 103 if (nstate == IEEE80211_S_RUN) { 104 switch (ostate) { 105 case IEEE80211_S_INIT: 106 ieee80211_create_ibss(vap, ic->ic_curchan); 107 break; 108 default: 109 break; 110 } 111 /* 112 * NB: this shouldn't be here but many people use 113 * monitor mode for raw packets; once we switch 114 * them over to adhoc demo mode remove this. 115 */ 116 ieee80211_node_authorize(vap->iv_bss); 117 } 118 return 0; 119 } 120 121 /* 122 * Process a received frame in monitor mode. 123 */ 124 static int 125 monitor_input(struct ieee80211_node *ni, struct mbuf *m, 126 const struct ieee80211_rx_stats *rxs, int rssi, int nf) 127 { 128 struct ieee80211vap *vap = ni->ni_vap; 129 struct ifnet *ifp = vap->iv_ifp; 130 131 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 132 133 if (ieee80211_radiotap_active_vap(vap)) 134 ieee80211_radiotap_rx(vap, m); 135 m_freem(m); 136 return -1; 137 } 138