ieee80211_crypto_none.c revision 288526 
1/*-
2 * Copyright (c) 2002-2008 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__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_crypto_none.c 288526 2015-10-03 00:50:13Z adrian $");
28
29/*
30 * IEEE 802.11 NULL crypto support.
31 */
32#include "opt_wlan.h"
33
34#include <sys/param.h>
35#include <sys/kernel.h>
36#include <sys/systm.h>
37#include <sys/mbuf.h>
38#include <sys/module.h>
39
40#include <sys/socket.h>
41
42#include <net/if.h>
43#include <net/if_media.h>
44#include <net/ethernet.h>
45
46#include <net80211/ieee80211_var.h>
47
48static	void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
49static	void none_detach(struct ieee80211_key *);
50static	int none_setkey(struct ieee80211_key *);
51static	void none_setiv(struct ieee80211_key *, uint8_t *);
52static	int none_encap(struct ieee80211_key *, struct mbuf *);
53static	int none_decap(struct ieee80211_key *, struct mbuf *, int);
54static	int none_enmic(struct ieee80211_key *, struct mbuf *, int);
55static	int none_demic(struct ieee80211_key *, struct mbuf *, int);
56
57const struct ieee80211_cipher ieee80211_cipher_none = {
58	.ic_name	= "NONE",
59	.ic_cipher	= IEEE80211_CIPHER_NONE,
60	.ic_header	= 0,
61	.ic_trailer	= 0,
62	.ic_miclen	= 0,
63	.ic_attach	= none_attach,
64	.ic_detach	= none_detach,
65	.ic_setkey	= none_setkey,
66	.ic_setiv	= none_setiv,
67	.ic_encap	= none_encap,
68	.ic_decap	= none_decap,
69	.ic_enmic	= none_enmic,
70	.ic_demic	= none_demic,
71};
72
73static void *
74none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
75{
76	return vap;		/* for diagnostics+stats */
77}
78
79static void
80none_detach(struct ieee80211_key *k)
81{
82	(void) k;
83}
84
85static int
86none_setkey(struct ieee80211_key *k)
87{
88	(void) k;
89	return 1;
90}
91
92static void
93none_setiv(struct ieee80211_key *k, uint8_t *ivp)
94{
95}
96
97static int
98none_encap(struct ieee80211_key *k, struct mbuf *m)
99{
100	struct ieee80211vap *vap = k->wk_private;
101#ifdef IEEE80211_DEBUG
102	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
103#endif
104	uint8_t keyid;
105
106	keyid = ieee80211_crypto_get_keyid(vap, k);
107
108	/*
109	 * The specified key is not setup; this can
110	 * happen, at least, when changing keys.
111	 */
112	IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1,
113	    "key id %u is not set (encap)", keyid);
114	vap->iv_stats.is_tx_badcipher++;
115	return 0;
116}
117
118static int
119none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
120{
121	struct ieee80211vap *vap = k->wk_private;
122#ifdef IEEE80211_DEBUG
123	struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
124	const uint8_t *ivp = (const uint8_t *)&wh[1];
125#endif
126
127	/*
128	 * The specified key is not setup; this can
129	 * happen, at least, when changing keys.
130	 */
131	/* XXX useful to know dst too */
132	IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
133	    "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
134	vap->iv_stats.is_rx_badkeyid++;
135	return 0;
136}
137
138static int
139none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
140{
141	struct ieee80211vap *vap = k->wk_private;
142
143	vap->iv_stats.is_tx_badcipher++;
144	return 0;
145}
146
147static int
148none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
149{
150	struct ieee80211vap *vap = k->wk_private;
151
152	vap->iv_stats.is_rx_badkeyid++;
153	return 0;
154}
155