1 /* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
2 /*
3  * if_alg: User-space algorithm interface
4  *
5  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  */
13 
14 #ifndef _LINUX_IF_ALG_H
15 #define _LINUX_IF_ALG_H
16 
17 #include <linux/types.h>
18 
19 struct sockaddr_alg {
20 	__u16	salg_family;
21 	__u8	salg_type[14];
22 	__u32	salg_feat;
23 	__u32	salg_mask;
24 	__u8	salg_name[64];
25 };
26 
27 /*
28  * Linux v4.12 and later removed the 64-byte limit on salg_name[]; it's now an
29  * arbitrary-length field.  We had to keep the original struct above for source
30  * compatibility with existing userspace programs, though.  Use the new struct
31  * below if support for very long algorithm names is needed.  To do this,
32  * allocate 'sizeof(struct sockaddr_alg_new) + strlen(algname) + 1' bytes, and
33  * copy algname (including the null terminator) into salg_name.
34  */
35 struct sockaddr_alg_new {
36 	__u16	salg_family;
37 	__u8	salg_type[14];
38 	__u32	salg_feat;
39 	__u32	salg_mask;
40 	__u8	salg_name[];
41 };
42 
43 struct af_alg_iv {
44 	__u32	ivlen;
45 	__u8	iv[];
46 };
47 
48 /* Socket options */
49 #define ALG_SET_KEY			1
50 #define ALG_SET_IV			2
51 #define ALG_SET_OP			3
52 #define ALG_SET_AEAD_ASSOCLEN		4
53 #define ALG_SET_AEAD_AUTHSIZE		5
54 #define ALG_SET_DRBG_ENTROPY		6
55 #define ALG_SET_KEY_BY_KEY_SERIAL	7
56 
57 /* Operations */
58 #define ALG_OP_DECRYPT			0
59 #define ALG_OP_ENCRYPT			1
60 
61 #endif	/* _LINUX_IF_ALG_H */
62