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/malloc.h> 37 #include <sys/systm.h> 38 #include <sys/mbuf.h> 39 #include <sys/module.h> 40 41 #include <sys/socket.h> 42 43 #include <net/if.h> 44 #include <net/if_media.h> 45 #include <net/ethernet.h> 46 47 #include <netproto/802_11/ieee80211_var.h> 48 49 static void *none_attach(struct ieee80211vap *, struct ieee80211_key *); 50 static void none_detach(struct ieee80211_key *); 51 static int none_setkey(struct ieee80211_key *); 52 static void none_setiv(struct ieee80211_key *, uint8_t *); 53 static int none_encap(struct ieee80211_key *, struct mbuf *); 54 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 55 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 56 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 57 58 const struct ieee80211_cipher ieee80211_cipher_none = { 59 .ic_name = "NONE", 60 .ic_cipher = IEEE80211_CIPHER_NONE, 61 .ic_header = 0, 62 .ic_trailer = 0, 63 .ic_miclen = 0, 64 .ic_attach = none_attach, 65 .ic_detach = none_detach, 66 .ic_setkey = none_setkey, 67 .ic_setiv = none_setiv, 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 ieee80211vap *vap, struct ieee80211_key *k) 76 { 77 return vap; /* 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 void 94 none_setiv(struct ieee80211_key *k, uint8_t *ivp) 95 { 96 } 97 98 static int 99 none_encap(struct ieee80211_key *k, struct mbuf *m) 100 { 101 struct ieee80211vap *vap = k->wk_private; 102 #ifdef IEEE80211_DEBUG 103 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 104 #endif 105 uint8_t keyid; 106 107 keyid = ieee80211_crypto_get_keyid(vap, k); 108 109 /* 110 * The specified key is not setup; this can 111 * happen, at least, when changing keys. 112 */ 113 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1, 114 "key id %u is not set (encap)", keyid); 115 vap->iv_stats.is_tx_badcipher++; 116 return 0; 117 } 118 119 static int 120 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 121 { 122 struct ieee80211vap *vap = k->wk_private; 123 #ifdef IEEE80211_DEBUG 124 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 125 const uint8_t *ivp = (const uint8_t *)&wh[1]; 126 #endif 127 128 /* 129 * The specified key is not setup; this can 130 * happen, at least, when changing keys. 131 */ 132 /* XXX useful to know dst too */ 133 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 134 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6); 135 vap->iv_stats.is_rx_badkeyid++; 136 return 0; 137 } 138 139 static int 140 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 141 { 142 struct ieee80211vap *vap = k->wk_private; 143 144 vap->iv_stats.is_tx_badcipher++; 145 return 0; 146 } 147 148 static int 149 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 150 { 151 struct ieee80211vap *vap = k->wk_private; 152 153 vap->iv_stats.is_rx_badkeyid++; 154 return 0; 155 } 156