linux/include/crypto/if_alg.h
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   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
  25struct crypto_async_request;
  26
  27struct 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
  37struct af_alg_completion {
  38        struct completion completion;
  39        int err;
  40};
  41
  42struct af_alg_control {
  43        struct af_alg_iv *iv;
  44        int op;
  45};
  46
  47struct 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
  58struct af_alg_sgl {
  59        struct scatterlist sg[ALG_MAX_PAGES];
  60        struct page *pages[ALG_MAX_PAGES];
  61};
  62
  63int af_alg_register_type(const struct af_alg_type *type);
  64int af_alg_unregister_type(const struct af_alg_type *type);
  65
  66int af_alg_release(struct socket *sock);
  67int af_alg_accept(struct sock *sk, struct socket *newsock);
  68
  69int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
  70                   int write);
  71void af_alg_free_sg(struct af_alg_sgl *sgl);
  72
  73int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);
  74
  75int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
  76void af_alg_complete(struct crypto_async_request *req, int err);
  77
  78static inline struct alg_sock *alg_sk(struct sock *sk)
  79{
  80        return (struct alg_sock *)sk;
  81}
  82
  83static inline void af_alg_release_parent(struct sock *sk)
  84{
  85        sock_put(alg_sk(sk)->parent);
  86}
  87
  88static 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
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