1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
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 /*
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/malloc.h>
37 #include <sys/systm.h>
38 #include <sys/mbuf.h>
39 #include <sys/module.h>
40
41 #include <sys/socket.h>
42
43 #include <net/if.h>
44 #include <net/if_media.h>
45 #include <net/ethernet.h>
46
47 #include <net80211/ieee80211_var.h>
48
49 static void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
50 static void none_detach(struct ieee80211_key *);
51 static int none_setkey(struct ieee80211_key *);
52 static void none_setiv(struct ieee80211_key *, uint8_t *);
53 static int none_encap(struct ieee80211_key *, struct mbuf *);
54 static int none_decap(struct ieee80211_key *, struct mbuf *, int);
55 static int none_enmic(struct ieee80211_key *, struct mbuf *, int);
56 static int none_demic(struct ieee80211_key *, struct mbuf *, int);
57
58 const struct ieee80211_cipher ieee80211_cipher_none = {
59 .ic_name = "NONE",
60 .ic_cipher = IEEE80211_CIPHER_NONE,
61 .ic_header = 0,
62 .ic_trailer = 0,
63 .ic_miclen = 0,
64 .ic_attach = none_attach,
65 .ic_detach = none_detach,
66 .ic_setkey = none_setkey,
67 .ic_setiv = none_setiv,
68 .ic_encap = none_encap,
69 .ic_decap = none_decap,
70 .ic_enmic = none_enmic,
71 .ic_demic = none_demic,
72 };
73
74 static void *
none_attach(struct ieee80211vap * vap,struct ieee80211_key * k)75 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
76 {
77 return vap; /* for diagnostics+stats */
78 }
79
80 static void
none_detach(struct ieee80211_key * k)81 none_detach(struct ieee80211_key *k)
82 {
83 (void) k;
84 }
85
86 static int
none_setkey(struct ieee80211_key * k)87 none_setkey(struct ieee80211_key *k)
88 {
89 (void) k;
90 return 1;
91 }
92
93 static void
none_setiv(struct ieee80211_key * k,uint8_t * ivp)94 none_setiv(struct ieee80211_key *k, uint8_t *ivp)
95 {
96 }
97
98 static int
none_encap(struct ieee80211_key * k,struct mbuf * m)99 none_encap(struct ieee80211_key *k, struct mbuf *m)
100 {
101 struct ieee80211vap *vap = k->wk_private;
102 #ifdef IEEE80211_DEBUG
103 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
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 #endif
115 vap->iv_stats.is_tx_badcipher++;
116 return 0;
117 }
118
119 static int
none_decap(struct ieee80211_key * k,struct mbuf * m,int hdrlen)120 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen)
121 {
122 struct ieee80211vap *vap = k->wk_private;
123 #ifdef IEEE80211_DEBUG
124 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
125 const uint8_t *ivp = (const uint8_t *)&wh[1];
126 #endif
127
128 /*
129 * The specified key is not setup; this can
130 * happen, at least, when changing keys.
131 */
132 /* XXX useful to know dst too */
133 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2,
134 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6);
135 vap->iv_stats.is_rx_badkeyid++;
136 return 0;
137 }
138
139 static int
none_enmic(struct ieee80211_key * k,struct mbuf * m,int force)140 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force)
141 {
142 struct ieee80211vap *vap = k->wk_private;
143
144 vap->iv_stats.is_tx_badcipher++;
145 return 0;
146 }
147
148 static int
none_demic(struct ieee80211_key * k,struct mbuf * m,int force)149 none_demic(struct ieee80211_key *k, struct mbuf *m, int force)
150 {
151 struct ieee80211vap *vap = k->wk_private;
152
153 vap->iv_stats.is_rx_badkeyid++;
154 return 0;
155 }
156