xref: /openbmc/linux/include/crypto/if_alg.h (revision 0edbfea5)
1 /*
2  * if_alg: User-space algorithm interface
3  *
4  * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the Free
8  * Software Foundation; either version 2 of the License, or (at your option)
9  * any later version.
10  *
11  */
12 
13 #ifndef _CRYPTO_IF_ALG_H
14 #define _CRYPTO_IF_ALG_H
15 
16 #include <linux/compiler.h>
17 #include <linux/completion.h>
18 #include <linux/if_alg.h>
19 #include <linux/scatterlist.h>
20 #include <linux/types.h>
21 #include <net/sock.h>
22 
23 #define ALG_MAX_PAGES			16
24 
25 struct crypto_async_request;
26 
27 struct alg_sock {
28 	/* struct sock must be the first member of struct alg_sock */
29 	struct sock sk;
30 
31 	struct sock *parent;
32 
33 	unsigned int refcnt;
34 	unsigned int nokey_refcnt;
35 
36 	const struct af_alg_type *type;
37 	void *private;
38 };
39 
40 struct af_alg_completion {
41 	struct completion completion;
42 	int err;
43 };
44 
45 struct af_alg_control {
46 	struct af_alg_iv *iv;
47 	int op;
48 	unsigned int aead_assoclen;
49 };
50 
51 struct af_alg_type {
52 	void *(*bind)(const char *name, u32 type, u32 mask);
53 	void (*release)(void *private);
54 	int (*setkey)(void *private, const u8 *key, unsigned int keylen);
55 	int (*accept)(void *private, struct sock *sk);
56 	int (*accept_nokey)(void *private, struct sock *sk);
57 	int (*setauthsize)(void *private, unsigned int authsize);
58 
59 	struct proto_ops *ops;
60 	struct proto_ops *ops_nokey;
61 	struct module *owner;
62 	char name[14];
63 };
64 
65 struct af_alg_sgl {
66 	struct scatterlist sg[ALG_MAX_PAGES + 1];
67 	struct page *pages[ALG_MAX_PAGES];
68 	unsigned int npages;
69 };
70 
71 int af_alg_register_type(const struct af_alg_type *type);
72 int af_alg_unregister_type(const struct af_alg_type *type);
73 
74 int af_alg_release(struct socket *sock);
75 void af_alg_release_parent(struct sock *sk);
76 int af_alg_accept(struct sock *sk, struct socket *newsock);
77 
78 int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);
79 void af_alg_free_sg(struct af_alg_sgl *sgl);
80 void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new);
81 
82 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
83 
84 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
85 void af_alg_complete(struct crypto_async_request *req, int err);
86 
87 static inline struct alg_sock *alg_sk(struct sock *sk)
88 {
89 	return (struct alg_sock *)sk;
90 }
91 
92 static inline void af_alg_init_completion(struct af_alg_completion *completion)
93 {
94 	init_completion(&completion->completion);
95 }
96 
97 #endif	/* _CRYPTO_IF_ALG_H */
98