if_alg.h

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/*
 * if_alg: User-space algorithm interface
 *
 * Copyright (c) 2010 Herbert Xu <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */

#ifndef _CRYPTO_IF_ALG_H
#define _CRYPTO_IF_ALG_H

#include <linux/compiler.h>
#include <linux/completion.h>
#include <linux/if_alg.h>
#include <linux/scatterlist.h>
#include <linux/types.h>
#include <net/sock.h>

#define ALG_MAX_PAGES           16

struct crypto_async_request;

struct alg_sock {
    /* struct sock must be the first member of struct alg_sock */
    struct sock sk;

    struct sock *parent;

    const struct af_alg_type *type;
    void *private;
};

struct af_alg_completion {
    struct completion completion;
    int err;
};

struct af_alg_control {
    struct af_alg_iv *iv;
    int op;
};

struct af_alg_type {
    void *(*bind)(const char *name, u32 type, u32 mask);
    void (*release)(void *private);
    int (*setkey)(void *private, const u8 *key, unsigned int keylen);
    int (*accept)(void *private, struct sock *sk);

    struct proto_ops *ops;
    struct module *owner;
    char name[14];
};

struct af_alg_sgl {
    struct scatterlist sg[ALG_MAX_PAGES];
    struct page *pages[ALG_MAX_PAGES];
};

int af_alg_register_type(const struct af_alg_type *type);
int af_alg_unregister_type(const struct af_alg_type *type);

int af_alg_release(struct socket *sock);
int af_alg_accept(struct sock *sk, struct socket *newsock);

int af_alg_make_sg(struct af_alg_sgl *sgl, void __user *addr, int len,
           int write);
void af_alg_free_sg(struct af_alg_sgl *sgl);

int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);

int af_alg_wait_for_completion(int err, struct af_alg_completion *completion);
void af_alg_complete(struct crypto_async_request *req, int err);

static inline struct alg_sock *alg_sk(struct sock *sk)
{
    return (struct alg_sock *)sk;
}

static inline void af_alg_release_parent(struct sock *sk)
{
    sock_put(alg_sk(sk)->parent);
}

static inline void af_alg_init_completion(struct af_alg_completion *completion)
{
    init_completion(&completion->completion);
}

#endif  /* _CRYPTO_IF_ALG_H */