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 1.7 2006/11/16 01:33:40 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
55 static void *none_attach(struct ieee80211com *, struct ieee80211_key *);
56 static void none_detach(struct ieee80211_key *);
57 static int none_setkey(struct ieee80211_key *);
58 static int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t);
59 static int none_decap(struct ieee80211_key *, struct mbuf *, int);
60 static int none_enmic(struct ieee80211_key *, struct mbuf *, int);
61 static int none_demic(struct ieee80211_key *, struct mbuf *, int);
62
63 const 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
78 static void *
none_attach(struct ieee80211com * ic,struct ieee80211_key * k)79 none_attach(struct ieee80211com *ic, struct ieee80211_key *k)
80 {
81 return ic; /* for diagnostics+stats */
82 }
83
84 static void
none_detach(struct ieee80211_key * k)85 none_detach(struct ieee80211_key *k)
86 {
87 (void) k;
88 }
89
90 static int
none_setkey(struct ieee80211_key * k)91 none_setkey(struct ieee80211_key *k)
92 {
93 (void) k;
94 return 1;
95 }
96
97 static int
none_encap(struct ieee80211_key * k,struct mbuf * m,u_int8_t keyid)98 none_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
116 static int
none_decap(struct ieee80211_key * k,struct mbuf * m,int hdrlen)117 none_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
137 static int
none_enmic(struct ieee80211_key * k,struct mbuf * m,int force)138 none_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
146 static int
none_demic(struct ieee80211_key * k,struct mbuf * m,int force)147 none_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