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/*
* algif_hash: User-space interface for hash algorithms
*
* This file provides the user-space API for hash algorithms.
*
* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
*
* 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.
*
*/

#include <crypto/hash.h>
#include <crypto/if_alg.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/net.h>
#include <net/sock.h>

struct hash_ctx {
struct af_alg_sgl sgl;

u8 *result;

struct af_alg_completion completion;

unsigned int len;
bool more;

struct ahash_request req;
};

static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
struct msghdr *msg, size_t ignored)
{
int limit = ALG_MAX_PAGES * PAGE_SIZE;
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
unsigned long iovlen;
struct iovec *iov;
long copied = 0;
int err;

if (limit > sk->sk_sndbuf)
limit = sk->sk_sndbuf;

lock_sock(sk);
if (!ctx->more) {
err = crypto_ahash_init(&ctx->req);
if (err)
goto unlock;
}

ctx->more = 0;

for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
iovlen--, iov++) {
unsigned long seglen = iov->iov_len;
char __user *from = iov->iov_base;

while (seglen) {
int len = min_t(unsigned long, seglen, limit);
int newlen;

newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
if (newlen < 0) {
err = copied ? 0 : newlen;
goto unlock;
}

ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
newlen);

err = af_alg_wait_for_completion(
crypto_ahash_update(&ctx->req),
&ctx->completion);

af_alg_free_sg(&ctx->sgl);

if (err)
goto unlock;

seglen -= newlen;
from += newlen;
copied += newlen;
}
}

err = 0;

ctx->more = msg->msg_flags & MSG_MORE;
if (!ctx->more) {
ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
&ctx->completion);
}

unlock:
release_sock(sk);

return err ?: copied;
}

static ssize_t hash_sendpage(struct socket *sock, struct page *page,
int offset, size_t size, int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
int err;

lock_sock(sk);
sg_init_table(ctx->sgl.sg, 1);
sg_set_page(ctx->sgl.sg, page, size, offset);

ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);

if (!(flags & MSG_MORE)) {
if (ctx->more)
err = crypto_ahash_finup(&ctx->req);
else
err = crypto_ahash_digest(&ctx->req);
} else {
if (!ctx->more) {
err = crypto_ahash_init(&ctx->req);
if (err)
goto unlock;
}

err = crypto_ahash_update(&ctx->req);
}

err = af_alg_wait_for_completion(err, &ctx->completion);
if (err)
goto unlock;

ctx->more = flags & MSG_MORE;

unlock:
release_sock(sk);

return err ?: size;
}

static int hash_recvmsg(struct kiocb *unused, struct socket *sock,
struct msghdr *msg, size_t len, int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
int err;

if (len > ds)
len = ds;
else if (len < ds)
msg->msg_flags |= MSG_TRUNC;

lock_sock(sk);
if (ctx->more) {
ctx->more = 0;
ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
&ctx->completion);
if (err)
goto unlock;
}

err = memcpy_toiovec(msg->msg_iov, ctx->result, len);

unlock:
release_sock(sk);

return err ?: len;
}

static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
{
struct sock *sk = sock->sk;
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;
struct ahash_request *req = &ctx->req;
char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
struct sock *sk2;
struct alg_sock *ask2;
struct hash_ctx *ctx2;
int err;

err = crypto_ahash_export(req, state);
if (err)
return err;

err = af_alg_accept(ask->parent, newsock);
if (err)
return err;

sk2 = newsock->sk;
ask2 = alg_sk(sk2);
ctx2 = ask2->private;
ctx2->more = 1;

err = crypto_ahash_import(&ctx2->req, state);
if (err) {
sock_orphan(sk2);
sock_put(sk2);
}

return err;
}

static struct proto_ops algif_hash_ops = {
.family = PF_ALG,

.connect = sock_no_connect,
.socketpair = sock_no_socketpair,
.getname = sock_no_getname,
.ioctl = sock_no_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
.getsockopt = sock_no_getsockopt,
.mmap = sock_no_mmap,
.bind = sock_no_bind,
.setsockopt = sock_no_setsockopt,
.poll = sock_no_poll,

.release = af_alg_release,
.sendmsg = hash_sendmsg,
.sendpage = hash_sendpage,
.recvmsg = hash_recvmsg,
.accept = hash_accept,
};

static void *hash_bind(const char *name, u32 type, u32 mask)
{
return crypto_alloc_ahash(name, type, mask);
}

static void hash_release(void *private)
{
crypto_free_ahash(private);
}

static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
{
return crypto_ahash_setkey(private, key, keylen);
}

static void hash_sock_destruct(struct sock *sk)
{
struct alg_sock *ask = alg_sk(sk);
struct hash_ctx *ctx = ask->private;

sock_kfree_s(sk, ctx->result,
crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
sock_kfree_s(sk, ctx, ctx->len);
af_alg_release_parent(sk);
}

static int hash_accept_parent(void *private, struct sock *sk)
{
struct hash_ctx *ctx;
struct alg_sock *ask = alg_sk(sk);
unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
unsigned ds = crypto_ahash_digestsize(private);

ctx = sock_kmalloc(sk, len, GFP_KERNEL);
if (!ctx)
return -ENOMEM;

ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
if (!ctx->result) {
sock_kfree_s(sk, ctx, len);
return -ENOMEM;
}

memset(ctx->result, 0, ds);

ctx->len = len;
ctx->more = 0;
af_alg_init_completion(&ctx->completion);

ask->private = ctx;

ahash_request_set_tfm(&ctx->req, private);
ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
af_alg_complete, &ctx->completion);

sk->sk_destruct = hash_sock_destruct;

return 0;
}

static const struct af_alg_type algif_type_hash = {
.bind = hash_bind,
.release = hash_release,
.setkey = hash_setkey,
.accept = hash_accept_parent,
.ops = &algif_hash_ops,
.name = "hash",
.owner = THIS_MODULE
};

static int __init algif_hash_init(void)
{
return af_alg_register_type(&algif_type_hash);
}

static void __exit algif_hash_exit(void)
{
int err = af_alg_unregister_type(&algif_type_hash);
BUG_ON(err);
}

module_init(algif_hash_init);
module_exit(algif_hash_exit);
MODULE_LICENSE("GPL");
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