1/*-
2 * Copyright (c) 2002-2005 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#ifdef __FreeBSD__
34__FBSDID("$FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.5 2005/06/10 16:11:24 sam Exp $");
35#endif
36#ifdef __NetBSD__
37__KERNEL_RCSID(0, "$NetBSD: ieee80211_crypto_none.c,v 1.6 2006/10/12 01:32:30 christos Exp $");
38#endif
39
40/*
41 * IEEE 802.11 NULL crypto support.
42 */
43#include <sys/param.h>
44#include <sys/systm.h>
45#include <sys/mbuf.h>
46
47#include <sys/socket.h>
48
49#include <net/if.h>
50#include <net/if_ether.h>
51#include <net/if_media.h>
52
53#include <net80211/ieee80211_var.h>
54
55static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
56static	void none_detach(struct ieee80211_key *);
57static	int none_setkey(struct ieee80211_key *);
58static	int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
59static	int none_decap(struct ieee80211_key *, struct mbuf *, int);
60static	int none_enmic(struct ieee80211_key *, struct mbuf *, int);
61static	int none_demic(struct ieee80211_key *, struct mbuf *, int);
62
63const struct ieee80211_cipher ieee80211_cipher_none = {
64	.ic_name	= "NONE",
65	.ic_cipher	= IEEE80211_CIPHER_NONE,
66	.ic_header	= 0,
67	.ic_trailer	= 0,
68	.ic_miclen	= 0,
69	.ic_attach	= none_attach,
70	.ic_detach	= none_detach,
71	.ic_setkey	= none_setkey,
72	.ic_encap	= none_encap,
73	.ic_decap	= none_decap,
74	.ic_enmic	= none_enmic,
75	.ic_demic	= none_demic,
76};
77
78static void *
79none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
80{
81	return ic;		/* for diagnostics+stats */
82}
83
84static void
85none_detach(struct ieee80211_key *k)
86{
87	(void) k;
88}
89
90static int
91none_setkey(struct ieee80211_key *k)
92{
93	(void) k;
94	return 1;
95}
96
97static int
98none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
99{
100	struct ieee80211com *ic = k->wk_private;
101#ifdef IEEE80211_DEBUG
102	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
103#endif
104
105	/*
106	 * The specified key is not setup; this can
107	 * happen, at least, when changing keys.
108	 */
109	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
110		"[%s] key id %u is not set (encap)\n",
111		ether_sprintf(wh->i_addr1), keyid>>6);
112	ic->ic_stats.is_tx_badcipher++;
113	return 0;
114}
115
116static int
117none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
118{
119	struct ieee80211com *ic = k->wk_private;
120#ifdef IEEE80211_DEBUG
121	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
122	const u_int8_t *ivp = (const u_int8_t *)&wh[1];
123#endif
124
125	/*
126	 * The specified key is not setup; this can
127	 * happen, at least, when changing keys.
128	 */
129	/* XXX useful to know dst too */
130	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
131		"[%s] key id %u is not set (decap)\n",
132		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
133	ic->ic_stats.is_rx_badkeyid++;
134	return 0;
135}
136
137static int
138none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
139{
140	struct ieee80211com *ic = k->wk_private;
141
142	ic->ic_stats.is_tx_badcipher++;
143	return 0;
144}
145
146static int
147none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
148{
149	struct ieee80211com *ic = k->wk_private;
150
151	ic->ic_stats.is_rx_badkeyid++;
152	return 0;
153}
154