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ieee80211_crypto_none.c revision 1.8.4.1 
      1 /*-
      2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      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