1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 /* 32 * IEEE 802.11 NULL crypto support. 33 */ 34 #include "opt_wlan.h" 35 36 #include <sys/param.h> 37 #include <sys/kernel.h> 38 #include <sys/malloc.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 ieee80211vap *, struct ieee80211_key *); 52 static void none_detach(struct ieee80211_key *); 53 static int none_setkey(struct ieee80211_key *); 54 static void none_setiv(struct ieee80211_key *, uint8_t *); 55 static int none_encap(struct ieee80211_key *, struct mbuf *); 56 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 57 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 58 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 59 60 const struct ieee80211_cipher ieee80211_cipher_none = { 61 .ic_name = "NONE", 62 .ic_cipher = IEEE80211_CIPHER_NONE, 63 .ic_header = 0, 64 .ic_trailer = 0, 65 .ic_miclen = 0, 66 .ic_attach = none_attach, 67 .ic_detach = none_detach, 68 .ic_setkey = none_setkey, 69 .ic_setiv = none_setiv, 70 .ic_encap = none_encap, 71 .ic_decap = none_decap, 72 .ic_enmic = none_enmic, 73 .ic_demic = none_demic, 74 }; 75 76 static void * 77 none_attach(struct ieee80211vap *vap, struct ieee80211_key *k) 78 { 79 return vap; /* for diagnostics+stats */ 80 } 81 82 static void 83 none_detach(struct ieee80211_key *k) 84 { 85 (void) k; 86 } 87 88 static int 89 none_setkey(struct ieee80211_key *k) 90 { 91 (void) k; 92 return 1; 93 } 94 95 static void 96 none_setiv(struct ieee80211_key *k, uint8_t *ivp) 97 { 98 } 99 100 static int 101 none_encap(struct ieee80211_key *k, struct mbuf *m) 102 { 103 struct ieee80211vap *vap = k->wk_private; 104 #ifdef IEEE80211_DEBUG 105 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 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 #endif 117 vap->iv_stats.is_tx_badcipher++; 118 return 0; 119 } 120 121 static int 122 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 123 { 124 struct ieee80211vap *vap = k->wk_private; 125 #ifdef IEEE80211_DEBUG 126 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 127 const uint8_t *ivp = (const uint8_t *)&wh[1]; 128 #endif 129 130 /* 131 * The specified key is not setup; this can 132 * happen, at least, when changing keys. 133 */ 134 /* XXX useful to know dst too */ 135 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO, wh->i_addr2, 136 "key id %u is not set (decap)", ivp[IEEE80211_WEP_IVLEN] >> 6); 137 vap->iv_stats.is_rx_badkeyid++; 138 return 0; 139 } 140 141 static int 142 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 143 { 144 struct ieee80211vap *vap = k->wk_private; 145 146 vap->iv_stats.is_tx_badcipher++; 147 return 0; 148 } 149 150 static int 151 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 152 { 153 struct ieee80211vap *vap = k->wk_private; 154 155 vap->iv_stats.is_rx_badkeyid++; 156 return 0; 157 } 158