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_var.h> 45 #include <net/if_media.h> 46 #include <net/ethernet.h> 47 48 #include <netproto/802_11/ieee80211_var.h> 49 50 static void *none_attach(struct ieee80211vap *, struct ieee80211_key *); 51 static void none_detach(struct ieee80211_key *); 52 static int none_setkey(struct ieee80211_key *); 53 static void none_setiv(struct ieee80211_key *, uint8_t *); 54 static int none_encap(struct ieee80211_key *, struct mbuf *); 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_setiv = none_setiv, 69 .ic_encap = none_encap, 70 .ic_decap = none_decap, 71 .ic_enmic = none_enmic, 72 .ic_demic = none_demic, 73 }; 74 75 static void * 76 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k) 77 { 78 return vap; /* for diagnostics+stats */ 79 } 80 81 static void 82 none_detach(struct ieee80211_key *k) 83 { 84 (void) k; 85 } 86 87 static int 88 none_setkey(struct ieee80211_key *k) 89 { 90 (void) k; 91 return 1; 92 } 93 94 static void 95 none_setiv(struct ieee80211_key *k, uint8_t *ivp) 96 { 97 } 98 99 static int 100 none_encap(struct ieee80211_key *k, struct mbuf *m) 101 { 102 struct ieee80211vap *vap = k->wk_private; 103 #ifdef IEEE80211_DEBUG 104 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 105 #endif 106 uint8_t keyid; 107 108 keyid = ieee80211_crypto_get_keyid(vap, k); 109 110 /* 111 * The specified key is not setup; this can 112 * happen, at least, when changing keys. 113 */ 114 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1, 115 "key id %u is not set (encap)", keyid); 116 vap->iv_stats.is_tx_badcipher++; 117 return 0; 118 } 119 120 static int 121 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 122 { 123 struct ieee80211vap *vap = k->wk_private; 124 #ifdef IEEE80211_DEBUG 125 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 126 const uint8_t *ivp = (const uint8_t *)&wh[1]; 127 #endif 128 129 /* 130 * The specified key is not setup; this can 131 * happen, at least, when changing keys. 132 */ 133 /* XXX useful to know dst too */ 134 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 135 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6); 136 vap->iv_stats.is_rx_badkeyid++; 137 return 0; 138 } 139 140 static int 141 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 142 { 143 struct ieee80211vap *vap = k->wk_private; 144 145 vap->iv_stats.is_tx_badcipher++; 146 return 0; 147 } 148 149 static int 150 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 151 { 152 struct ieee80211vap *vap = k->wk_private; 153 154 vap->iv_stats.is_rx_badkeyid++; 155 return 0; 156 } 157