1 /*- 2 * Copyright (c) 2002-2008 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 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/systm.h> 37 #include <sys/mbuf.h> 38 #include <sys/module.h> 39 40 #include <sys/socket.h> 41 42 #include <net/if.h> 43 #include <net/if_media.h> 44 #include <net/ethernet.h> 45 46 #include <net80211/ieee80211_var.h> 47 48 static void *none_attach(struct ieee80211vap *, struct ieee80211_key *); 49 static void none_detach(struct ieee80211_key *); 50 static int none_setkey(struct ieee80211_key *); 51 static void none_setiv(struct ieee80211_key *, uint8_t *); 52 static int none_encap(struct ieee80211_key *, struct mbuf *); 53 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 54 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 55 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 56 57 const struct ieee80211_cipher ieee80211_cipher_none = { 58 .ic_name = "NONE", 59 .ic_cipher = IEEE80211_CIPHER_NONE, 60 .ic_header = 0, 61 .ic_trailer = 0, 62 .ic_miclen = 0, 63 .ic_attach = none_attach, 64 .ic_detach = none_detach, 65 .ic_setkey = none_setkey, 66 .ic_setiv = none_setiv, 67 .ic_encap = none_encap, 68 .ic_decap = none_decap, 69 .ic_enmic = none_enmic, 70 .ic_demic = none_demic, 71 }; 72 73 static void * 74 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k) 75 { 76 return vap; /* for diagnostics+stats */ 77 } 78 79 static void 80 none_detach(struct ieee80211_key *k) 81 { 82 (void) k; 83 } 84 85 static int 86 none_setkey(struct ieee80211_key *k) 87 { 88 (void) k; 89 return 1; 90 } 91 92 static void 93 none_setiv(struct ieee80211_key *k, uint8_t *ivp) 94 { 95 } 96 97 static int 98 none_encap(struct ieee80211_key *k, struct mbuf *m) 99 { 100 struct ieee80211vap *vap = k->wk_private; 101 #ifdef IEEE80211_DEBUG 102 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 103 #endif 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 vap->iv_stats.is_tx_badcipher++; 115 return 0; 116 } 117 118 static int 119 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 120 { 121 struct ieee80211vap *vap = k->wk_private; 122 #ifdef IEEE80211_DEBUG 123 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 124 const uint8_t *ivp = (const uint8_t *)&wh[1]; 125 #endif 126 127 /* 128 * The specified key is not setup; this can 129 * happen, at least, when changing keys. 130 */ 131 /* XXX useful to know dst too */ 132 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 133 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6); 134 vap->iv_stats.is_rx_badkeyid++; 135 return 0; 136 } 137 138 static int 139 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 140 { 141 struct ieee80211vap *vap = k->wk_private; 142 143 vap->iv_stats.is_tx_badcipher++; 144 return 0; 145 } 146 147 static int 148 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 149 { 150 struct ieee80211vap *vap = k->wk_private; 151 152 vap->iv_stats.is_rx_badkeyid++; 153 return 0; 154 } 155