include/crypto/if_alg.h

   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/types.h>
  20 #include <net/sock.h>
  21
  22 #define ALG_MAX_PAGES                   16
  23
  24 struct crypto_async_request;
  25
  26 struct alg_sock {
  27         /* struct sock must be the first member of struct alg_sock */
  28         struct sock sk;
  29
  30         struct sock *parent;
  31
  32         const struct af_alg_type *type;
  33         void *private;
  34 };
  35
  36 struct af_alg_completion {
  37         struct completion completion;
  38         int err;
  39 };
  40
  41 struct af_alg_control {
  42         struct af_alg_iv *iv;
  43         int op;
  44 };
  45
  46 struct af_alg_type {
  47         void *(*bind)(const char *name, u32 type, u32 mask);
  48         void (*release)(void *private);
  49         int (*setkey)(void *private, const u8 *key, unsigned int keylen);
  50         int (*accept)(void *private, struct sock *sk);
  51
  52         struct proto_ops *ops;
  53         struct module *owner;
  54         char name[14];
  55 };
  56
  57 struct af_alg_sgl {
  58         struct scatterlist sg[ALG_MAX_PAGES];
  59         struct page *pages[ALG_MAX_PAGES];
  60 };
  61
  62 int af_alg_register_type(const struct af_alg_type *type);
  63 int af_alg_unregister_type(const struct af_alg_type *type);
  64
  65 int af_alg_release(struct socket *sock);
  66 int af_alg_accept(struct sock *sk, struct socket *newsock);
  67
  68 int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
  69                    int write);
  70 void af_alg_free_sg(struct af_alg_sgl *sgl);
  71
  72 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
  73
  74 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
  75 void af_alg_complete(struct crypto_async_request *req, int err);
  76
  77 static inline struct alg_sock *alg_sk(struct sock *sk)
  78 {
  79         return (struct alg_sock *)sk;
  80 }
  81
  82 static inline void af_alg_release_parent(struct sock *sk)
  83 {
  84         sock_put(alg_sk(sk)->parent);
  85 }
  86
  87 static inline void af_alg_init_completion(struct af_alg_completion *completion)
  88 {
  89         init_completion(&completion->completion);
  90 }
  91
  92 #endif  /* _CRYPTO_IF_ALG_H */