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 const struct af_alg_type *type;
34 void *private;
35 };
36
37 struct af_alg_completion {
38 struct completion completion;
39 int err;
40 };
41
42 struct af_alg_control {
43 struct af_alg_iv *iv;
44 int op;
45 };
46
47 struct af_alg_type {
48 void *(*bind)(const char *name, u32 type, u32 mask);
49 void (*release)(void *private);
50 int (*setkey)(void *private, const u8 *key, unsigned int keylen);
51 int (*accept)(void *private, struct sock *sk);
52
53 struct proto_ops *ops;
54 struct module *owner;
55 char name[14];
56 };
57
58 struct af_alg_sgl {
59 struct scatterlist sg[ALG_MAX_PAGES];
60 struct page *pages[ALG_MAX_PAGES];
61 };
62
63 int af_alg_register_type(const struct af_alg_type *type);
64 int af_alg_unregister_type(const struct af_alg_type *type);
65
66 int af_alg_release(struct socket *sock);
67 int af_alg_accept(struct sock *sk, struct socket *newsock);
68
69 int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
70 int write);
71 void af_alg_free_sg(struct af_alg_sgl *sgl);
72
73 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
74
75 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
76 void af_alg_complete(struct crypto_async_request *req, int err);
77
alg_sk(struct sock * sk)78 static inline struct alg_sock *alg_sk(struct sock *sk)
79 {
80 return (struct alg_sock *)sk;
81 }
82
af_alg_release_parent(struct sock * sk)83 static inline void af_alg_release_parent(struct sock *sk)
84 {
85 sock_put(alg_sk(sk)->parent);
86 }
87
af_alg_init_completion(struct af_alg_completion * completion)88 static inline void af_alg_init_completion(struct af_alg_completion *completion)
89 {
90 init_completion(&completion->completion);
91 }
92
93 #endif /* _CRYPTO_IF_ALG_H */
94