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: releng/12.0/sys/net80211/ieee80211_crypto_none.c 326272 2017-11-27 15:23:17Z pfg $");
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
51static	void *none_attach(struct ieee80211vap *, struct ieee80211_key *);
52static	void none_detach(struct ieee80211_key *);
53static	int none_setkey(struct ieee80211_key *);
54static	void none_setiv(struct ieee80211_key *, uint8_t *);
55static	int none_encap(struct ieee80211_key *, struct mbuf *);
56static	int none_decap(struct ieee80211_key *, struct mbuf *, int);
57static	int none_enmic(struct ieee80211_key *, struct mbuf *, int);
58static	int none_demic(struct ieee80211_key *, struct mbuf *, int);
59
60const 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
76static void *
77none_attach(struct ieee80211vap *vap, struct ieee80211_key *k)
78{
79	return vap;		/* for diagnostics+stats */
80}
81
82static void
83none_detach(struct ieee80211_key *k)
84{
85	(void) k;
86}
87
88static int
89none_setkey(struct ieee80211_key *k)
90{
91	(void) k;
92	return 1;
93}
94
95static void
96none_setiv(struct ieee80211_key *k, uint8_t *ivp)
97{
98}
99
100static int
101none_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
121static int
122none_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
141static int
142none_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
150static int
151none_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}
158