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 __FBSDID("$FreeBSD$"); 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_media.h> 47 #include <net/ethernet.h> 48 49 #include <net80211/ieee80211_var.h> 50 51 static void *none_attach(struct ieee80211com *, struct ieee80211_key *); 52 static void none_detach(struct ieee80211_key *); 53 static int none_setkey(struct ieee80211_key *); 54 static int none_encap(struct ieee80211_key *, struct mbuf *, u_int8_t); 55 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 56 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 57 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 58 59 const struct ieee80211_cipher ieee80211_cipher_none = { 60 .ic_name = "NONE", 61 .ic_cipher = IEEE80211_CIPHER_NONE, 62 .ic_header = 0, 63 .ic_trailer = 0, 64 .ic_miclen = 0, 65 .ic_attach = none_attach, 66 .ic_detach = none_detach, 67 .ic_setkey = none_setkey, 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 * 75 none_attach(struct ieee80211com *ic, struct ieee80211_key *k) 76 { 77 return ic; /* for diagnostics+stats */ 78 } 79 80 static void 81 none_detach(struct ieee80211_key *k) 82 { 83 (void) k; 84 } 85 86 static int 87 none_setkey(struct ieee80211_key *k) 88 { 89 (void) k; 90 return 1; 91 } 92 93 static int 94 none_encap(struct ieee80211_key *k, struct mbuf *m, u_int8_t keyid) 95 { 96 struct ieee80211com *ic = k->wk_private; 97 #ifdef IEEE80211_DEBUG 98 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 99 #endif 100 101 /* 102 * The specified key is not setup; this can 103 * happen, at least, when changing keys. 104 */ 105 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 106 "[%s] key id %u is not set (encap)\n", 107 ether_sprintf(wh->i_addr1), keyid>>6); 108 ic->ic_stats.is_tx_badcipher++; 109 return 0; 110 } 111 112 static int 113 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 114 { 115 struct ieee80211com *ic = k->wk_private; 116 #ifdef IEEE80211_DEBUG 117 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 118 const u_int8_t *ivp = (const u_int8_t *)&wh[1]; 119 #endif 120 121 /* 122 * The specified key is not setup; this can 123 * happen, at least, when changing keys. 124 */ 125 /* XXX useful to know dst too */ 126 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 127 "[%s] key id %u is not set (decap)\n", 128 ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6); 129 ic->ic_stats.is_rx_badkeyid++; 130 return 0; 131 } 132 133 static int 134 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 135 { 136 struct ieee80211com *ic = k->wk_private; 137 138 ic->ic_stats.is_tx_badcipher++; 139 return 0; 140 } 141 142 static int 143 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 144 { 145 struct ieee80211com *ic = k->wk_private; 146 147 ic->ic_stats.is_rx_badkeyid++; 148 return 0; 149 } 150