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 * $FreeBSD: src/sys/net80211/ieee80211_crypto_none.c,v 1.5 2005/06/10 16:11:24 sam Exp $ 32 * $DragonFly: src/sys/netproto/802_11/wlan/ieee80211_crypto_none.c,v 1.2 2006/08/05 03:18:27 sephe Exp $ 33 */ 34 35 /* 36 * IEEE 802.11 NULL crypto support. 37 */ 38 #include <sys/param.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_arp.h> 47 #include <net/if_media.h> 48 #include <net/ethernet.h> 49 50 #include <netproto/802_11/ieee80211_var.h> 51 52 static void *none_crypto_attach(struct ieee80211com *, struct ieee80211_key *); 53 static void none_crypto_detach(struct ieee80211_key *); 54 static int none_crypto_setkey(struct ieee80211_key *); 55 static int none_crypto_encap(struct ieee80211_key *, struct mbuf *, uint8_t); 56 static int none_crypto_decap(struct ieee80211_key *, struct mbuf *, int); 57 static int none_crypto_enmic(struct ieee80211_key *, struct mbuf *, int); 58 static int none_crypto_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_crypto_attach, 67 .ic_detach = none_crypto_detach, 68 .ic_setkey = none_crypto_setkey, 69 .ic_encap = none_crypto_encap, 70 .ic_decap = none_crypto_decap, 71 .ic_enmic = none_crypto_enmic, 72 .ic_demic = none_crypto_demic, 73 }; 74 75 static void * 76 none_crypto_attach(struct ieee80211com *ic, struct ieee80211_key *k) 77 { 78 return ic; /* for diagnostics+stats */ 79 } 80 81 static void 82 none_crypto_detach(struct ieee80211_key *k) 83 { 84 (void) k; 85 } 86 87 static int 88 none_crypto_setkey(struct ieee80211_key *k) 89 { 90 (void) k; 91 return 1; 92 } 93 94 static int 95 none_crypto_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) 96 { 97 struct ieee80211com *ic = k->wk_private; 98 #ifdef IEEE80211_DEBUG 99 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 100 #endif 101 102 /* 103 * The specified key is not setup; this can 104 * happen, at least, when changing keys. 105 */ 106 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 107 "[%6D] key id %u is not set (encap)\n", 108 wh->i_addr1, ":", keyid>>6); 109 ic->ic_stats.is_tx_badcipher++; 110 return 0; 111 } 112 113 static int 114 none_crypto_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 115 { 116 struct ieee80211com *ic = k->wk_private; 117 #ifdef IEEE80211_DEBUG 118 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 119 const uint8_t *ivp = (const uint8_t *)&wh[1]; 120 #endif 121 122 /* 123 * The specified key is not setup; this can 124 * happen, at least, when changing keys. 125 */ 126 /* XXX useful to know dst too */ 127 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 128 "[%6D] key id %u is not set (decap)\n", 129 wh->i_addr2, ":", ivp[IEEE80211_WEP_IVLEN] >> 6); 130 ic->ic_stats.is_rx_badkeyid++; 131 return 0; 132 } 133 134 static int 135 none_crypto_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 136 { 137 struct ieee80211com *ic = k->wk_private; 138 139 ic->ic_stats.is_tx_badcipher++; 140 return 0; 141 } 142 143 static int 144 none_crypto_demic(struct ieee80211_key *k, struct mbuf *m, int force) 145 { 146 struct ieee80211com *ic = k->wk_private; 147 148 ic->ic_stats.is_rx_badkeyid++; 149 return 0; 150 } 151