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![Herbert Xu](/assets/img/avatar_default.png)
This patch adds the af_alg plugin for hash, corresponding to the ahash kernel operation type. Keys can optionally be set through the setsockopt interface. Each sendmsg call will finalise the hash unless sent with a MSG_MORE flag. Partial hash states can be cloned using accept(2). The interface is completely synchronous, all operations will complete prior to the system call returning. Both sendmsg(2) and splice(2) support reading the user-space data directly without copying (except that the Crypto API itself may copy the data if alignment is off). For now only the splice(2) interface supports performing digest instead of init/update/final. In future the sendmsg(2) interface will also be modified to use digest/finup where possible so that hardware that cannot return a partial hash state can still benefit from this interface. Thakns to Miloslav Trmac for reviewing this and contributing fixes and improvements. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: David S. Miller <davem@davemloft.net> Tested-by: Martin Willi <martin@strongswan.org>
319 lines
6.7 KiB
C
319 lines
6.7 KiB
C
/*
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* algif_hash: User-space interface for hash algorithms
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*
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* This file provides the user-space API for hash algorithms.
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*
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* Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/hash.h>
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#include <crypto/if_alg.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/net.h>
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#include <net/sock.h>
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struct hash_ctx {
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struct af_alg_sgl sgl;
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u8 *result;
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struct af_alg_completion completion;
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unsigned int len;
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bool more;
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struct ahash_request req;
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};
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static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
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struct msghdr *msg, size_t ignored)
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{
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int limit = ALG_MAX_PAGES * PAGE_SIZE;
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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unsigned long iovlen;
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struct iovec *iov;
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long copied = 0;
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int err;
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if (limit > sk->sk_sndbuf)
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limit = sk->sk_sndbuf;
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lock_sock(sk);
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if (!ctx->more) {
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err = crypto_ahash_init(&ctx->req);
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if (err)
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goto unlock;
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}
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ctx->more = 0;
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for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
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iovlen--, iov++) {
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unsigned long seglen = iov->iov_len;
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char __user *from = iov->iov_base;
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while (seglen) {
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int len = min_t(unsigned long, seglen, limit);
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int newlen;
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newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
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if (newlen < 0)
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goto unlock;
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ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
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newlen);
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err = af_alg_wait_for_completion(
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crypto_ahash_update(&ctx->req),
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&ctx->completion);
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af_alg_free_sg(&ctx->sgl);
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if (err)
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goto unlock;
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seglen -= newlen;
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from += newlen;
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copied += newlen;
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}
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}
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err = 0;
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ctx->more = msg->msg_flags & MSG_MORE;
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if (!ctx->more) {
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ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
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err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
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&ctx->completion);
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}
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unlock:
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release_sock(sk);
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return err ?: copied;
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}
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static ssize_t hash_sendpage(struct socket *sock, struct page *page,
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int offset, size_t size, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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int err;
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lock_sock(sk);
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sg_init_table(ctx->sgl.sg, 1);
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sg_set_page(ctx->sgl.sg, page, size, offset);
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ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
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if (!(flags & MSG_MORE)) {
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if (ctx->more)
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err = crypto_ahash_finup(&ctx->req);
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else
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err = crypto_ahash_digest(&ctx->req);
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} else {
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if (!ctx->more) {
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err = crypto_ahash_init(&ctx->req);
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if (err)
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goto unlock;
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}
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err = crypto_ahash_update(&ctx->req);
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}
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err = af_alg_wait_for_completion(err, &ctx->completion);
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if (err)
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goto unlock;
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ctx->more = flags & MSG_MORE;
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unlock:
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release_sock(sk);
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return err ?: size;
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}
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static int hash_recvmsg(struct kiocb *unused, struct socket *sock,
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struct msghdr *msg, size_t len, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
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int err;
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if (len > ds)
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len = ds;
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else if (len < ds)
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msg->msg_flags |= MSG_TRUNC;
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lock_sock(sk);
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if (ctx->more) {
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ctx->more = 0;
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ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
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err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
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&ctx->completion);
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if (err)
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goto unlock;
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}
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err = memcpy_toiovec(msg->msg_iov, ctx->result, len);
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unlock:
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release_sock(sk);
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return err ?: len;
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}
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static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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struct ahash_request *req = &ctx->req;
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char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
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struct sock *sk2;
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struct alg_sock *ask2;
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struct hash_ctx *ctx2;
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int err;
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err = crypto_ahash_export(req, state);
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if (err)
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return err;
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err = af_alg_accept(ask->parent, newsock);
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if (err)
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return err;
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sk2 = newsock->sk;
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ask2 = alg_sk(sk2);
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ctx2 = ask2->private;
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ctx2->more = 1;
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err = crypto_ahash_import(&ctx2->req, state);
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if (err) {
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sock_orphan(sk2);
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sock_put(sk2);
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}
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return err;
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}
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static struct proto_ops algif_hash_ops = {
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.family = PF_ALG,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.getname = sock_no_getname,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.getsockopt = sock_no_getsockopt,
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.mmap = sock_no_mmap,
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.bind = sock_no_bind,
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.setsockopt = sock_no_setsockopt,
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.poll = sock_no_poll,
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.release = af_alg_release,
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.sendmsg = hash_sendmsg,
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.sendpage = hash_sendpage,
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.recvmsg = hash_recvmsg,
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.accept = hash_accept,
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};
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static void *hash_bind(const char *name, u32 type, u32 mask)
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{
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return crypto_alloc_ahash(name, type, mask);
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}
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static void hash_release(void *private)
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{
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crypto_free_ahash(private);
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}
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static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
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{
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return crypto_ahash_setkey(private, key, keylen);
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}
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static void hash_sock_destruct(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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struct hash_ctx *ctx = ask->private;
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sock_kfree_s(sk, ctx->result,
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crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
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sock_kfree_s(sk, ctx, ctx->len);
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af_alg_release_parent(sk);
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}
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static int hash_accept_parent(void *private, struct sock *sk)
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{
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struct hash_ctx *ctx;
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struct alg_sock *ask = alg_sk(sk);
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unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
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unsigned ds = crypto_ahash_digestsize(private);
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ctx = sock_kmalloc(sk, len, GFP_KERNEL);
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if (!ctx)
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return -ENOMEM;
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ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
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if (!ctx->result) {
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sock_kfree_s(sk, ctx, len);
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return -ENOMEM;
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}
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memset(ctx->result, 0, ds);
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ctx->len = len;
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ctx->more = 0;
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af_alg_init_completion(&ctx->completion);
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ask->private = ctx;
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ahash_request_set_tfm(&ctx->req, private);
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ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
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af_alg_complete, &ctx->completion);
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sk->sk_destruct = hash_sock_destruct;
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return 0;
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}
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static const struct af_alg_type algif_type_hash = {
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.bind = hash_bind,
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.release = hash_release,
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.setkey = hash_setkey,
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.accept = hash_accept_parent,
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.ops = &algif_hash_ops,
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.name = "hash",
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.owner = THIS_MODULE
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};
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static int __init algif_hash_init(void)
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{
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return af_alg_register_type(&algif_type_hash);
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}
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static void __exit algif_hash_exit(void)
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{
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int err = af_alg_unregister_type(&algif_type_hash);
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BUG_ON(err);
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}
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module_init(algif_hash_init);
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module_exit(algif_hash_exit);
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MODULE_LICENSE("GPL");
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