1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30
31 /*
32 * IEEE 802.11 NULL crypto support.
33 */
34 #include "opt_wlan.h"
35
36 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/systm.h>
40 #include <sys/mbuf.h>
41 #include <sys/module.h>
42
43 #include <sys/socket.h>
44
45 #include <net/if.h>
46 #include <net/if_media.h>
47 #include <net/ethernet.h>
48
49 #include <net80211/ieee80211_var.h>
50
51 static void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
52 static void none_detach(struct ieee80211_key *);
53 static int none_setkey(struct ieee80211_key *);
54 static void none_setiv(struct ieee80211_key *, uint8_t *);
55 static int none_encap(struct ieee80211_key *, struct mbuf *);
56 static int none_decap(struct ieee80211_key *, struct mbuf *, int);
57 static int none_enmic(struct ieee80211_key *, struct mbuf *, int);
58 static int none_demic(struct ieee80211_key *, struct mbuf *, int);
59
60 const struct ieee80211_cipher ieee80211_cipher_none = {
61 .ic_name = "NONE",
62 .ic_cipher = IEEE80211_CIPHER_NONE,
63 .ic_header = 0,
64 .ic_trailer = 0,
65 .ic_miclen = 0,
66 .ic_attach = none_attach,
67 .ic_detach = none_detach,
68 .ic_setkey = none_setkey,
69 .ic_setiv = none_setiv,
70 .ic_encap = none_encap,
71 .ic_decap = none_decap,
72 .ic_enmic = none_enmic,
73 .ic_demic = none_demic,
74 };
75
76 static void *
77 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
78 {
79 return vap; /* for diagnostics+stats */
80 }
81
82 static void
83 none_detach(struct ieee80211_key *k)
84 {
85 (void) k;
86 }
87
88 static int
89 none_setkey(struct ieee80211_key *k)
90 {
91 (void) k;
92 return 1;
93 }
94
95 static void
96 none_setiv(struct ieee80211_key *k, uint8_t *ivp)
97 {
98 }
99
100 static int
101 none_encap(struct ieee80211_key *k, struct mbuf *m)
102 {
103 struct ieee80211vap *vap = k->wk_private;
104 #ifdef IEEE80211_DEBUG
105 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
106 uint8_t keyid;
107
108 keyid = ieee80211_crypto_get_keyid(vap, k);
109
110 /*
111 * The specified key is not setup; this can
112 * happen, at least, when changing keys.
113 */
114 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1,
115 "key id %u is not set (encap)", keyid);
116 #endif
117 vap->iv_stats.is_tx_badcipher++;
118 return 0;
119 }
120
121 static int
122 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
123 {
124 struct ieee80211vap *vap = k->wk_private;
125 #ifdef IEEE80211_DEBUG
126 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
127 const uint8_t *ivp = (const uint8_t *)&wh[1];
128 #endif
129
130 /*
131 * The specified key is not setup; this can
132 * happen, at least, when changing keys.
133 */
134 /* XXX useful to know dst too */
135 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
136 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
137 vap->iv_stats.is_rx_badkeyid++;
138 return 0;
139 }
140
141 static int
142 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
143 {
144 struct ieee80211vap *vap = k->wk_private;
145
146 vap->iv_stats.is_tx_badcipher++;
147 return 0;
148 }
149
150 static int
151 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
152 {
153 struct ieee80211vap *vap = k->wk_private;
154
155 vap->iv_stats.is_rx_badkeyid++;
156 return 0;
157 }
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