1 /*- 2 * Copyright (c) 2002-2007 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 <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/mbuf.h> 35 #include <sys/module.h> 36 37 #include <sys/socket.h> 38 39 #include <net/if.h> 40 #include <net/if_media.h> 41 #include <net/ethernet.h> 42 43 #include <net80211/ieee80211_var.h> 44 45 static void *none_attach(struct ieee80211com *, struct ieee80211_key *); 46 static void none_detach(struct ieee80211_key *); 47 static int none_setkey(struct ieee80211_key *); 48 static int none_encap(struct ieee80211_key *, struct mbuf *, uint8_t); 49 static int none_decap(struct ieee80211_key *, struct mbuf *, int); 50 static int none_enmic(struct ieee80211_key *, struct mbuf *, int); 51 static int none_demic(struct ieee80211_key *, struct mbuf *, int); 52 53 const struct ieee80211_cipher ieee80211_cipher_none = { 54 .ic_name = "NONE", 55 .ic_cipher = IEEE80211_CIPHER_NONE, 56 .ic_header = 0, 57 .ic_trailer = 0, 58 .ic_miclen = 0, 59 .ic_attach = none_attach, 60 .ic_detach = none_detach, 61 .ic_setkey = none_setkey, 62 .ic_encap = none_encap, 63 .ic_decap = none_decap, 64 .ic_enmic = none_enmic, 65 .ic_demic = none_demic, 66 }; 67 68 static void * 69 none_attach(struct ieee80211com *ic, struct ieee80211_key *k) 70 { 71 return ic; /* for diagnostics+stats */ 72 } 73 74 static void 75 none_detach(struct ieee80211_key *k) 76 { 77 (void) k; 78 } 79 80 static int 81 none_setkey(struct ieee80211_key *k) 82 { 83 (void) k; 84 return 1; 85 } 86 87 static int 88 none_encap(struct ieee80211_key *k, struct mbuf *m, uint8_t keyid) 89 { 90 struct ieee80211com *ic = k->wk_private; 91 #ifdef IEEE80211_DEBUG 92 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 93 #endif 94 95 /* 96 * The specified key is not setup; this can 97 * happen, at least, when changing keys. 98 */ 99 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 100 "[%s] key id %u is not set (encap)\n", 101 ether_sprintf(wh->i_addr1), keyid>>6); 102 ic->ic_stats.is_tx_badcipher++; 103 return 0; 104 } 105 106 static int 107 none_decap(struct ieee80211_key *k, struct mbuf *m, int hdrlen) 108 { 109 struct ieee80211com *ic = k->wk_private; 110 #ifdef IEEE80211_DEBUG 111 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); 112 const uint8_t *ivp = (const uint8_t *)&wh[1]; 113 #endif 114 115 /* 116 * The specified key is not setup; this can 117 * happen, at least, when changing keys. 118 */ 119 /* XXX useful to know dst too */ 120 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 121 "[%s] key id %u is not set (decap)\n", 122 ether_sprintf(wh->i_addr2), ivp[IEEE80211_WEP_IVLEN] >> 6); 123 ic->ic_stats.is_rx_badkeyid++; 124 return 0; 125 } 126 127 static int 128 none_enmic(struct ieee80211_key *k, struct mbuf *m, int force) 129 { 130 struct ieee80211com *ic = k->wk_private; 131 132 ic->ic_stats.is_tx_badcipher++; 133 return 0; 134 } 135 136 static int 137 none_demic(struct ieee80211_key *k, struct mbuf *m, int force) 138 { 139 struct ieee80211com *ic = k->wk_private; 140 141 ic->ic_stats.is_rx_badkeyid++; 142 return 0; 143 } 144