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: src/sys/net80211/ieee80211_monitor.c,v 1.1 2008/04/20 20:35:43 sam Exp $");
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 noise, uint32_t rstamp);
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,
128 int rssi, int noise, uint32_t rstamp)
129 {
130 struct ieee80211vap *vap = ni->ni_vap;
131
132 if (bpf_peers_present(vap->iv_rawbpf))
133 bpf_mtap(vap->iv_rawbpf, m);
134 m_freem(m);
135 return -1;
136 }
137
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