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/* $OpenBSD: uvm_swap_encrypt.h,v 1.9 2009/03/23 22:10:04 oga Exp $ */
/*
* Copyright 1999 Niels Provos <provos@citi.umich.edu>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niels Provos.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _UVM_SWAP_ENCRYPT_H
#define _UVM_SWAP_ENCRYPT_H
#define SWPENC_ENABLE 0
#define SWPENC_CREATED 1
#define SWPENC_DELETED 2
#define SWPENC_MAXID 3
#define CTL_SWPENC_NAMES { \
{ "enable", CTLTYPE_INT }, \
{ "keyscreated", CTLTYPE_INT }, \
{ "keysdeleted", CTLTYPE_INT }, \
}
#define SWAP_KEY_EXPIRE (120 /*60 * 60*/) /* time after that keys expire */
#define SWAP_KEY_SIZE 4 /* 128-bit keys */
struct swap_key {
u_int32_t key[SWAP_KEY_SIZE]; /* secret key for swap range */
u_int16_t refcount; /* pages that still need it */
};
int swap_encrypt_ctl(int *, u_int, void *, size_t *, void *, size_t,
struct proc *);
void swap_encrypt(struct swap_key *,caddr_t, caddr_t, u_int64_t, size_t);
void swap_decrypt(struct swap_key *,caddr_t, caddr_t, u_int64_t, size_t);
void swap_key_cleanup(struct swap_key *);
void swap_key_prepare(struct swap_key *, int);
extern u_int uvm_swpkeyscreated;
#define SWAP_KEY_GET(s,x) do { \
if ((x)->refcount == 0) { \
arc4random_buf((x)->key,\
sizeof((x)->key)); \
uvm_swpkeyscreated++; \
} \
(x)->refcount++; \
} while(0);
#define SWAP_KEY_PUT(s,x) do { \
(x)->refcount--; \
if ((x)->refcount == 0) { \
swap_key_delete(x); \
} \
} while(0);
void swap_key_delete(struct swap_key *);
extern int uvm_doswapencrypt; /* swapencrypt enabled/disabled */
extern int uvm_swprekeyprint;
extern u_int uvm_swpkeyexpire; /* expiry time for keys (tR) */
extern int swap_encrypt_initialized;
#endif /* _UVM_SWAP_ENCRYPT_H */
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