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/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         unsigned int aead_assoclen;
  46 };
  47
  48 struct af_alg_type {
  49         void *(*bind)(const char *name, u32 type, u32 mask);
  50         void (*release)(void *private);
  51         int (*setkey)(void *private, const u8 *key, unsigned int keylen);
  52         int (*accept)(void *private, struct sock *sk);
  53         int (*setauthsize)(void *private, unsigned int authsize);
  54
  55         struct proto_ops *ops;
  56         struct module *owner;
  57         char name[14];
  58 };
  59
  60 struct af_alg_sgl {
  61         struct scatterlist sg[ALG_MAX_PAGES + 1];
  62         struct page *pages[ALG_MAX_PAGES];
  63         unsigned int npages;
  64 };
  65
  66 int af_alg_register_type(const struct af_alg_type *type);
  67 int af_alg_unregister_type(const struct af_alg_type *type);
  68
  69 int af_alg_release(struct socket *sock);
  70 int af_alg_accept(struct sock *sk, struct socket *newsock);
  71
  72 int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);
  73 void af_alg_free_sg(struct af_alg_sgl *sgl);
  74 void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new);
  75
  76 int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
  77
  78 int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
  79 void af_alg_complete(struct crypto_async_request *req, int err);
  80
  81 static inline struct alg_sock *alg_sk(struct sock *sk)
  82 {
  83         return (struct alg_sock *)sk;
  84 }
  85
  86 static inline void af_alg_release_parent(struct sock *sk)
  87 {
  88         sock_put(alg_sk(sk)->parent);
  89 }
  90
  91 static inline void af_alg_init_completion(struct af_alg_completion *completion)
  92 {
  93         init_completion(&completion->completion);
  94 }
  95
  96 #endif  /* _CRYPTO_IF_ALG_H */