ieee80211_crypto_none.c revision 138568 
1/*-
2 * Copyright (c) 2002-2004 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 * 3. The name of the author may not be used to endorse or promote products
14 *    derived from this software without specific prior written permission.
15 *
16 * Alternatively, this software may be distributed under the terms of the
17 * GNU General Public License ("GPL") version 2 as published by the Free
18 * Software Foundation.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_crypto_none.c 138568 2004-12-08 17:26:47Z sam $");
34
35/*
36 * IEEE 802.11 NULL crypto support.
37 */
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/mbuf.h>
41#include <sys/module.h>
42
43#include <sys/socket.h>
44
45#include <net/if.h>
46#include <net/if_media.h>
47#include <net/ethernet.h>
48
49#include <net80211/ieee80211_var.h>
50
51static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
52static	void none_detach(struct ieee80211_key *);
53static	int none_setkey(struct ieee80211_key *);
54static	int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
55static	int none_decap(struct ieee80211_key *, struct mbuf *);
56static	int none_enmic(struct ieee80211_key *, struct mbuf *);
57static	int none_demic(struct ieee80211_key *, struct mbuf *);
58
59const struct ieee80211_cipher ieee80211_cipher_none = {
60	.ic_name	= "NONE",
61	.ic_cipher	= IEEE80211_CIPHER_NONE,
62	.ic_header	= 0,
63	.ic_trailer	= 0,
64	.ic_miclen	= 0,
65	.ic_attach	= none_attach,
66	.ic_detach	= none_detach,
67	.ic_setkey	= none_setkey,
68	.ic_encap	= none_encap,
69	.ic_decap	= none_decap,
70	.ic_enmic	= none_enmic,
71	.ic_demic	= none_demic,
72};
73
74static void *
75none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
76{
77	return ic;		/* for diagnostics+stats */
78}
79
80static void
81none_detach(struct ieee80211_key *k)
82{
83	(void) k;
84}
85
86static int
87none_setkey(struct ieee80211_key *k)
88{
89	(void) k;
90	return 1;
91}
92
93static int
94none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
95{
96	struct ieee80211com *ic = k->wk_private;
97#ifdef IEEE80211_DEBUG
98	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
99#endif
100
101	/*
102	 * The specified key is not setup; this can
103	 * happen, at least, when changing keys.
104	 */
105	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
106		"[%s] key (id %u) is invalid\n",
107		ether_sprintf(wh->i_addr1), keyid>>6);
108	ic->ic_stats.is_tx_badcipher++;
109	return 0;
110}
111
112static int
113none_decap(struct ieee80211_key *k, struct mbuf *m)
114{
115	struct ieee80211com *ic = k->wk_private;
116#ifdef IEEE80211_DEBUG
117	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
118	const u_int8_t *ivp = (const u_int8_t *)&wh[1];
119#endif
120
121	/*
122	 * The specified key is not setup; this can
123	 * happen, at least, when changing keys.
124	 */
125	/* XXX useful to know dst too */
126	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
127		"[%s] key (id %u) is invalid\n",
128		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
129	ic->ic_stats.is_rx_badkeyid++;
130	return 0;
131}
132
133static int
134none_enmic(struct ieee80211_key *k, struct mbuf *m)
135{
136	struct ieee80211com *ic = k->wk_private;
137
138	ic->ic_stats.is_tx_badcipher++;
139	return 0;
140}
141
142static int
143none_demic(struct ieee80211_key *k, struct mbuf *m)
144{
145	struct ieee80211com *ic = k->wk_private;
146
147	ic->ic_stats.is_rx_badkeyid++;
148	return 0;
149}
150