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 1.4 2005/12/11 12:24:54 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_media.h> 51 52 #include <net80211/ieee80211_var.h> 53 54 static void *none_attach(struct ieee80211com *, struct ieee80211_key *); 55 static void none_detach(struct ieee80211_key *); 56 static int none_setkey(struct ieee80211_key *); 57 static int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t); 58 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 59 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 60 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 61 62 const struct ieee80211_cipher ieee80211_cipher_none = { 63 .ic_name = "NONE", 64 .ic_cipher = IEEE80211_CIPHER_NONE, 65 .ic_header = 0, 66 .ic_trailer = 0, 67 .ic_miclen = 0, 68 .ic_attach = none_attach, 69 .ic_detach = none_detach, 70 .ic_setkey = none_setkey, 71 .ic_encap = none_encap, 72 .ic_decap = none_decap, 73 .ic_enmic = none_enmic, 74 .ic_demic = none_demic, 75 }; 76 77 static void * 78 none_attach(struct ieee80211com *ic, struct ieee80211_key *k) 79 { 80 return ic; /* for diagnostics+stats */ 81 } 82 83 static void 84 none_detach(struct ieee80211_key *k) 85 { 86 (void) k; 87 } 88 89 static int 90 none_setkey(struct ieee80211_key *k) 91 { 92 (void) k; 93 return 1; 94 } 95 96 static int 97 none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid) 98 { 99 struct ieee80211com *ic = k->wk_private; 100 #ifdef IEEE80211_DEBUG 101 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 102 #endif 103 104 /* 105 * The specified key is not setup; this can 106 * happen, at least, when changing keys. 107 */ 108 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 109 "[%s] key id %u is not set (encap)\n", 110 ether_sprintf(wh->i_addr1), keyid>>6); 111 ic->ic_stats.is_tx_badcipher++; 112 return 0; 113 } 114 115 static int 116 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 117 { 118 struct ieee80211com *ic = k->wk_private; 119 #ifdef IEEE80211_DEBUG 120 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 121 const u_int8_t *ivp = (const u_int8_t *)&wh[1]; 122 #endif 123 124 /* 125 * The specified key is not setup; this can 126 * happen, at least, when changing keys. 127 */ 128 /* XXX useful to know dst too */ 129 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 130 "[%s] key id %u is not set (decap)\n", 131 ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6); 132 ic->ic_stats.is_rx_badkeyid++; 133 return 0; 134 } 135 136 static int 137 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 138 { 139 struct ieee80211com *ic = k->wk_private; 140 141 ic->ic_stats.is_tx_badcipher++; 142 return 0; 143 } 144 145 static int 146 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 147 { 148 struct ieee80211com *ic = k->wk_private; 149 150 ic->ic_stats.is_rx_badkeyid++; 151 return 0; 152 } 153