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: src/sys/net80211/ieee80211_crypto_none.c,v 1.8 2008/04/20 20:35:43 sam Exp $");
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
48 static void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
49 static void none_detach(struct ieee80211_key *);
50 static int none_setkey(struct ieee80211_key *);
51 static int none_encap(struct ieee80211_key *, struct mbuf *, uint8_t);
52 static int none_decap(struct ieee80211_key *, struct mbuf *, int);
53 static int none_enmic(struct ieee80211_key *, struct mbuf *, int);
54 static int none_demic(struct ieee80211_key *, struct mbuf *, int);
55
56 const struct ieee80211_cipher ieee80211_cipher_none = {
57 .ic_name = "NONE",
58 .ic_cipher = IEEE80211_CIPHER_NONE,
59 .ic_header = 0,
60 .ic_trailer = 0,
61 .ic_miclen = 0,
62 .ic_attach = none_attach,
63 .ic_detach = none_detach,
64 .ic_setkey = none_setkey,
65 .ic_encap = none_encap,
66 .ic_decap = none_decap,
67 .ic_enmic = none_enmic,
68 .ic_demic = none_demic,
69 };
70
71 static void *
72 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
73 {
74 return vap; /* for diagnostics+stats */
75 }
76
77 static void
78 none_detach(struct ieee80211_key *k)
79 {
80 (void) k;
81 }
82
83 static int
84 none_setkey(struct ieee80211_key *k)
85 {
86 (void) k;
87 return 1;
88 }
89
90 static int
91 none_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid)
92 {
93 struct ieee80211vap *vap = k->wk_private;
94 #ifdef IEEE80211_DEBUG
95 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
96 #endif
97
98 /*
99 * The specified key is not setup; this can
100 * happen, at least, when changing keys.
101 */
102 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1,
103 "key id %u is not set (encap)", keyid>>6);
104 vap->iv_stats.is_tx_badcipher++;
105 return 0;
106 }
107
108 static int
109 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
110 {
111 struct ieee80211vap *vap = k->wk_private;
112 #ifdef IEEE80211_DEBUG
113 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
114 const uint8_t *ivp = (const uint8_t *)&wh[1];
115 #endif
116
117 /*
118 * The specified key is not setup; this can
119 * happen, at least, when changing keys.
120 */
121 /* XXX useful to know dst too */
122 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
123 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
124 vap->iv_stats.is_rx_badkeyid++;
125 return 0;
126 }
127
128 static int
129 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
130 {
131 struct ieee80211vap *vap = k->wk_private;
132
133 vap->iv_stats.is_tx_badcipher++;
134 return 0;
135 }
136
137 static int
138 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
139 {
140 struct ieee80211vap *vap = k->wk_private;
141
142 vap->iv_stats.is_rx_badkeyid++;
143 return 0;
144 }
145
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