ieee80211_crypto_none.c revision 170360 
1/*-
2 * Copyright (c) 2002-2007 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__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_crypto_none.c 170360 2007-06-06 04:56:04Z sam $");
28
29/*
30 * IEEE 802.11 NULL crypto support.
31 */
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/mbuf.h>
35#include <sys/module.h>
36
37#include <sys/socket.h>
38
39#include <net/if.h>
40#include <net/if_media.h>
41#include <net/ethernet.h>
42
43#include <net80211/ieee80211_var.h>
44
45static	void *none_attach(struct ieee80211com *, struct ieee80211_key *);
46static	void none_detach(struct ieee80211_key *);
47static	int none_setkey(struct ieee80211_key *);
48static	int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
49static	int none_decap(struct ieee80211_key *, struct mbuf *, int);
50static	int none_enmic(struct ieee80211_key *, struct mbuf *, int);
51static	int none_demic(struct ieee80211_key *, struct mbuf *, int);
52
53const struct ieee80211_cipher ieee80211_cipher_none = {
54	.ic_name	= "NONE",
55	.ic_cipher	= IEEE80211_CIPHER_NONE,
56	.ic_header	= 0,
57	.ic_trailer	= 0,
58	.ic_miclen	= 0,
59	.ic_attach	= none_attach,
60	.ic_detach	= none_detach,
61	.ic_setkey	= none_setkey,
62	.ic_encap	= none_encap,
63	.ic_decap	= none_decap,
64	.ic_enmic	= none_enmic,
65	.ic_demic	= none_demic,
66};
67
68static void *
69none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
70{
71	return ic;		/* for diagnostics+stats */
72}
73
74static void
75none_detach(struct ieee80211_key *k)
76{
77	(void) k;
78}
79
80static int
81none_setkey(struct ieee80211_key *k)
82{
83	(void) k;
84	return 1;
85}
86
87static int
88none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid)
89{
90	struct ieee80211com *ic = k->wk_private;
91#ifdef IEEE80211_DEBUG
92	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
93#endif
94
95	/*
96	 * The specified key is not setup; this can
97	 * happen, at least, when changing keys.
98	 */
99	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
100		"[%s] key id %u is not set (encap)\n",
101		ether_sprintf(wh->i_addr1), keyid>>6);
102	ic->ic_stats.is_tx_badcipher++;
103	return 0;
104}
105
106static int
107none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
108{
109	struct ieee80211com *ic = k->wk_private;
110#ifdef IEEE80211_DEBUG
111	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
112	const u_int8_t *ivp = (const u_int8_t *)&wh[1];
113#endif
114
115	/*
116	 * The specified key is not setup; this can
117	 * happen, at least, when changing keys.
118	 */
119	/* XXX useful to know dst too */
120	IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
121		"[%s] key id %u is not set (decap)\n",
122		ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6);
123	ic->ic_stats.is_rx_badkeyid++;
124	return 0;
125}
126
127static int
128none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
129{
130	struct ieee80211com *ic = k->wk_private;
131
132	ic->ic_stats.is_tx_badcipher++;
133	return 0;
134}
135
136static int
137none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
138{
139	struct ieee80211com *ic = k->wk_private;
140
141	ic->ic_stats.is_rx_badkeyid++;
142	return 0;
143}
144