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         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, bool kern);
  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 */