/* * 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");