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 <netproto/802_11/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 int none_encap(struct ieee80211_key *, struct mbuf *, uint8_t); 52 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 53 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 54 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 55 56 const struct ieee80211_cipher ieee80211_cipher_none = { 57 .ic_name = "NONE", 58 .ic_cipher = IEEE80211_CIPHER_NONE, 59 .ic_header = 0, 60 .ic_trailer = 0, 61 .ic_miclen = 0, 62 .ic_attach = none_attach, 63 .ic_detach = none_detach, 64 .ic_setkey = none_setkey, 65 .ic_encap = none_encap, 66 .ic_decap = none_decap, 67 .ic_enmic = none_enmic, 68 .ic_demic = none_demic, 69 }; 70 71 static void * 72 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k) 73 { 74 return vap; /* for diagnostics+stats */ 75 } 76 77 static void 78 none_detach(struct ieee80211_key *k) 79 { 80 (void) k; 81 } 82 83 static int 84 none_setkey(struct ieee80211_key *k) 85 { 86 (void) k; 87 return 1; 88 } 89 90 static int 91 none_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) 92 { 93 struct ieee80211vap *vap = k->wk_private; 94 #ifdef IEEE80211_DEBUG 95 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 96 #endif 97 98 /* 99 * The specified key is not setup; this can 100 * happen, at least, when changing keys. 101 */ 102 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr1, 103 "key id %u is not set (encap)", keyid>>6); 104 vap->iv_stats.is_tx_badcipher++; 105 return 0; 106 } 107 108 static int 109 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 110 { 111 struct ieee80211vap *vap = k->wk_private; 112 #ifdef IEEE80211_DEBUG 113 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 114 const uint8_t *ivp = (const uint8_t *)&wh[1]; 115 #endif 116 117 /* 118 * The specified key is not setup; this can 119 * happen, at least, when changing keys. 120 */ 121 /* XXX useful to know dst too */ 122 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 123 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6); 124 vap->iv_stats.is_rx_badkeyid++; 125 return 0; 126 } 127 128 static int 129 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 130 { 131 struct ieee80211vap *vap = k->wk_private; 132 133 vap->iv_stats.is_tx_badcipher++; 134 return 0; 135 } 136 137 static int 138 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 139 { 140 struct ieee80211vap *vap = k->wk_private; 141 142 vap->iv_stats.is_rx_badkeyid++; 143 return 0; 144 } 145