v4.19.13 snapshot.
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
new file mode 100644
index 0000000..bfcf595
--- /dev/null
+++ b/crypto/algif_hash.c
@@ -0,0 +1,493 @@
+/*
+ * 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 crypto_wait wait;
+
+ unsigned int len;
+ bool more;
+
+ struct ahash_request req;
+};
+
+static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
+{
+ unsigned ds;
+
+ if (ctx->result)
+ return 0;
+
+ ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
+
+ ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
+ if (!ctx->result)
+ return -ENOMEM;
+
+ memset(ctx->result, 0, ds);
+
+ return 0;
+}
+
+static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
+{
+ unsigned ds;
+
+ if (!ctx->result)
+ return;
+
+ ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
+
+ sock_kzfree_s(sk, ctx->result, ds);
+ ctx->result = NULL;
+}
+
+static int hash_sendmsg(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;
+ long copied = 0;
+ int err;
+
+ if (limit > sk->sk_sndbuf)
+ limit = sk->sk_sndbuf;
+
+ lock_sock(sk);
+ if (!ctx->more) {
+ if ((msg->msg_flags & MSG_MORE))
+ hash_free_result(sk, ctx);
+
+ err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
+ if (err)
+ goto unlock;
+ }
+
+ ctx->more = 0;
+
+ while (msg_data_left(msg)) {
+ int len = msg_data_left(msg);
+
+ if (len > limit)
+ len = limit;
+
+ len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
+ if (len < 0) {
+ err = copied ? 0 : len;
+ goto unlock;
+ }
+
+ ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
+
+ err = crypto_wait_req(crypto_ahash_update(&ctx->req),
+ &ctx->wait);
+ af_alg_free_sg(&ctx->sgl);
+ if (err)
+ goto unlock;
+
+ copied += len;
+ iov_iter_advance(&msg->msg_iter, len);
+ }
+
+ err = 0;
+
+ ctx->more = msg->msg_flags & MSG_MORE;
+ if (!ctx->more) {
+ err = hash_alloc_result(sk, ctx);
+ if (err)
+ goto unlock;
+
+ ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
+ err = crypto_wait_req(crypto_ahash_final(&ctx->req),
+ &ctx->wait);
+ }
+
+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;
+
+ if (flags & MSG_SENDPAGE_NOTLAST)
+ flags |= MSG_MORE;
+
+ lock_sock(sk);
+ sg_init_table(ctx->sgl.sg, 1);
+ sg_set_page(ctx->sgl.sg, page, size, offset);
+
+ if (!(flags & MSG_MORE)) {
+ err = hash_alloc_result(sk, ctx);
+ if (err)
+ goto unlock;
+ } else if (!ctx->more)
+ hash_free_result(sk, ctx);
+
+ 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);
+ err = crypto_wait_req(err, &ctx->wait);
+ if (err)
+ goto unlock;
+ }
+
+ err = crypto_ahash_update(&ctx->req);
+ }
+
+ err = crypto_wait_req(err, &ctx->wait);
+ if (err)
+ goto unlock;
+
+ ctx->more = flags & MSG_MORE;
+
+unlock:
+ release_sock(sk);
+
+ return err ?: size;
+}
+
+static int hash_recvmsg(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));
+ bool result;
+ int err;
+
+ if (len > ds)
+ len = ds;
+ else if (len < ds)
+ msg->msg_flags |= MSG_TRUNC;
+
+ lock_sock(sk);
+ result = ctx->result;
+ err = hash_alloc_result(sk, ctx);
+ if (err)
+ goto unlock;
+
+ ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
+
+ if (!result && !ctx->more) {
+ err = crypto_wait_req(crypto_ahash_init(&ctx->req),
+ &ctx->wait);
+ if (err)
+ goto unlock;
+ }
+
+ if (!result || ctx->more) {
+ ctx->more = 0;
+ err = crypto_wait_req(crypto_ahash_final(&ctx->req),
+ &ctx->wait);
+ if (err)
+ goto unlock;
+ }
+
+ err = memcpy_to_msg(msg, ctx->result, len);
+
+unlock:
+ hash_free_result(sk, ctx);
+ release_sock(sk);
+
+ return err ?: len;
+}
+
+static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
+ bool kern)
+{
+ 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)) ? : 1];
+ struct sock *sk2;
+ struct alg_sock *ask2;
+ struct hash_ctx *ctx2;
+ bool more;
+ int err;
+
+ lock_sock(sk);
+ more = ctx->more;
+ err = more ? crypto_ahash_export(req, state) : 0;
+ release_sock(sk);
+
+ if (err)
+ return err;
+
+ err = af_alg_accept(ask->parent, newsock, kern);
+ if (err)
+ return err;
+
+ sk2 = newsock->sk;
+ ask2 = alg_sk(sk2);
+ ctx2 = ask2->private;
+ ctx2->more = more;
+
+ if (!more)
+ return err;
+
+ 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,
+
+ .release = af_alg_release,
+ .sendmsg = hash_sendmsg,
+ .sendpage = hash_sendpage,
+ .recvmsg = hash_recvmsg,
+ .accept = hash_accept,
+};
+
+static int hash_check_key(struct socket *sock)
+{
+ int err = 0;
+ struct sock *psk;
+ struct alg_sock *pask;
+ struct crypto_ahash *tfm;
+ struct sock *sk = sock->sk;
+ struct alg_sock *ask = alg_sk(sk);
+
+ lock_sock(sk);
+ if (ask->refcnt)
+ goto unlock_child;
+
+ psk = ask->parent;
+ pask = alg_sk(ask->parent);
+ tfm = pask->private;
+
+ err = -ENOKEY;
+ lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ goto unlock;
+
+ if (!pask->refcnt++)
+ sock_hold(psk);
+
+ ask->refcnt = 1;
+ sock_put(psk);
+
+ err = 0;
+
+unlock:
+ release_sock(psk);
+unlock_child:
+ release_sock(sk);
+
+ return err;
+}
+
+static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
+ size_t size)
+{
+ int err;
+
+ err = hash_check_key(sock);
+ if (err)
+ return err;
+
+ return hash_sendmsg(sock, msg, size);
+}
+
+static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
+ int offset, size_t size, int flags)
+{
+ int err;
+
+ err = hash_check_key(sock);
+ if (err)
+ return err;
+
+ return hash_sendpage(sock, page, offset, size, flags);
+}
+
+static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
+ size_t ignored, int flags)
+{
+ int err;
+
+ err = hash_check_key(sock);
+ if (err)
+ return err;
+
+ return hash_recvmsg(sock, msg, ignored, flags);
+}
+
+static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
+ int flags, bool kern)
+{
+ int err;
+
+ err = hash_check_key(sock);
+ if (err)
+ return err;
+
+ return hash_accept(sock, newsock, flags, kern);
+}
+
+static struct proto_ops algif_hash_ops_nokey = {
+ .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,
+
+ .release = af_alg_release,
+ .sendmsg = hash_sendmsg_nokey,
+ .sendpage = hash_sendpage_nokey,
+ .recvmsg = hash_recvmsg_nokey,
+ .accept = hash_accept_nokey,
+};
+
+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;
+
+ hash_free_result(sk, ctx);
+ sock_kfree_s(sk, ctx, ctx->len);
+ af_alg_release_parent(sk);
+}
+
+static int hash_accept_parent_nokey(void *private, struct sock *sk)
+{
+ struct crypto_ahash *tfm = private;
+ struct alg_sock *ask = alg_sk(sk);
+ struct hash_ctx *ctx;
+ unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
+
+ ctx = sock_kmalloc(sk, len, GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->result = NULL;
+ ctx->len = len;
+ ctx->more = 0;
+ crypto_init_wait(&ctx->wait);
+
+ ask->private = ctx;
+
+ ahash_request_set_tfm(&ctx->req, tfm);
+ ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+ crypto_req_done, &ctx->wait);
+
+ sk->sk_destruct = hash_sock_destruct;
+
+ return 0;
+}
+
+static int hash_accept_parent(void *private, struct sock *sk)
+{
+ struct crypto_ahash *tfm = private;
+
+ if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
+ return -ENOKEY;
+
+ return hash_accept_parent_nokey(private, sk);
+}
+
+static const struct af_alg_type algif_type_hash = {
+ .bind = hash_bind,
+ .release = hash_release,
+ .setkey = hash_setkey,
+ .accept = hash_accept_parent,
+ .accept_nokey = hash_accept_parent_nokey,
+ .ops = &algif_hash_ops,
+ .ops_nokey = &algif_hash_ops_nokey,
+ .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");