2 * algif_hash: User-space interface for hash algorithms
4 * This file provides the user-space API for hash algorithms.
6 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the Free
10 * Software Foundation; either version 2 of the License, or (at your option)
15 #include <crypto/hash.h>
16 #include <crypto/if_alg.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/net.h>
25 struct af_alg_sgl sgl;
29 struct af_alg_completion completion;
34 struct ahash_request req;
37 static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
38 struct msghdr *msg, size_t ignored)
40 int limit = ALG_MAX_PAGES * PAGE_SIZE;
41 struct sock *sk = sock->sk;
42 struct alg_sock *ask = alg_sk(sk);
43 struct hash_ctx *ctx = ask->private;
49 if (limit > sk->sk_sndbuf)
50 limit = sk->sk_sndbuf;
54 err = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
62 for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
64 unsigned long seglen = iov->iov_len;
65 char __user *from = iov->iov_base;
68 int len = min_t(unsigned long, seglen, limit);
71 newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
73 err = copied ? 0 : newlen;
77 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
80 err = af_alg_wait_for_completion(
81 crypto_ahash_update(&ctx->req),
84 af_alg_free_sg(&ctx->sgl);
97 ctx->more = msg->msg_flags & MSG_MORE;
99 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
100 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
107 return err ?: copied;
110 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
111 int offset, size_t size, int flags)
113 struct sock *sk = sock->sk;
114 struct alg_sock *ask = alg_sk(sk);
115 struct hash_ctx *ctx = ask->private;
118 if (flags & MSG_SENDPAGE_NOTLAST)
122 sg_init_table(ctx->sgl.sg, 1);
123 sg_set_page(ctx->sgl.sg, page, size, offset);
125 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
127 if (!(flags & MSG_MORE)) {
129 err = crypto_ahash_finup(&ctx->req);
131 err = crypto_ahash_digest(&ctx->req);
134 err = crypto_ahash_init(&ctx->req);
135 err = af_alg_wait_for_completion(err, &ctx->completion);
140 err = crypto_ahash_update(&ctx->req);
143 err = af_alg_wait_for_completion(err, &ctx->completion);
147 ctx->more = flags & MSG_MORE;
155 static int hash_recvmsg(struct kiocb *unused, struct socket *sock,
156 struct msghdr *msg, size_t len, int flags)
158 struct sock *sk = sock->sk;
159 struct alg_sock *ask = alg_sk(sk);
160 struct hash_ctx *ctx = ask->private;
161 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
167 msg->msg_flags |= MSG_TRUNC;
172 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
173 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
179 err = memcpy_toiovec(msg->msg_iov, ctx->result, len);
187 static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
189 struct sock *sk = sock->sk;
190 struct alg_sock *ask = alg_sk(sk);
191 struct hash_ctx *ctx = ask->private;
192 struct ahash_request *req = &ctx->req;
193 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
195 struct alg_sock *ask2;
196 struct hash_ctx *ctx2;
202 err = more ? crypto_ahash_export(req, state) : 0;
208 err = af_alg_accept(ask->parent, newsock);
214 ctx2 = ask2->private;
220 err = crypto_ahash_import(&ctx2->req, state);
229 static struct proto_ops algif_hash_ops = {
232 .connect = sock_no_connect,
233 .socketpair = sock_no_socketpair,
234 .getname = sock_no_getname,
235 .ioctl = sock_no_ioctl,
236 .listen = sock_no_listen,
237 .shutdown = sock_no_shutdown,
238 .getsockopt = sock_no_getsockopt,
239 .mmap = sock_no_mmap,
240 .bind = sock_no_bind,
241 .setsockopt = sock_no_setsockopt,
242 .poll = sock_no_poll,
244 .release = af_alg_release,
245 .sendmsg = hash_sendmsg,
246 .sendpage = hash_sendpage,
247 .recvmsg = hash_recvmsg,
248 .accept = hash_accept,
251 static int hash_check_key(struct socket *sock)
255 struct alg_sock *pask;
256 struct crypto_ahash *tfm;
257 struct sock *sk = sock->sk;
258 struct alg_sock *ask = alg_sk(sk);
265 pask = alg_sk(ask->parent);
269 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
270 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
289 static int hash_sendmsg_nokey(struct kiocb *unused, struct socket *sock,
290 struct msghdr *msg, size_t size)
294 err = hash_check_key(sock);
298 return hash_sendmsg(unused, sock, msg, size);
301 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
302 int offset, size_t size, int flags)
306 err = hash_check_key(sock);
310 return hash_sendpage(sock, page, offset, size, flags);
313 static int hash_recvmsg_nokey(struct kiocb *unused, struct socket *sock,
314 struct msghdr *msg, size_t ignored, int flags)
318 err = hash_check_key(sock);
322 return hash_recvmsg(unused, sock, msg, ignored, flags);
325 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
330 err = hash_check_key(sock);
334 return hash_accept(sock, newsock, flags);
337 static struct proto_ops algif_hash_ops_nokey = {
340 .connect = sock_no_connect,
341 .socketpair = sock_no_socketpair,
342 .getname = sock_no_getname,
343 .ioctl = sock_no_ioctl,
344 .listen = sock_no_listen,
345 .shutdown = sock_no_shutdown,
346 .getsockopt = sock_no_getsockopt,
347 .mmap = sock_no_mmap,
348 .bind = sock_no_bind,
349 .setsockopt = sock_no_setsockopt,
350 .poll = sock_no_poll,
352 .release = af_alg_release,
353 .sendmsg = hash_sendmsg_nokey,
354 .sendpage = hash_sendpage_nokey,
355 .recvmsg = hash_recvmsg_nokey,
356 .accept = hash_accept_nokey,
359 static void *hash_bind(const char *name, u32 type, u32 mask)
361 return crypto_alloc_ahash(name, type, mask);
364 static void hash_release(void *private)
366 crypto_free_ahash(private);
369 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
371 return crypto_ahash_setkey(private, key, keylen);
374 static void hash_sock_destruct(struct sock *sk)
376 struct alg_sock *ask = alg_sk(sk);
377 struct hash_ctx *ctx = ask->private;
379 sock_kfree_s(sk, ctx->result,
380 crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
381 sock_kfree_s(sk, ctx, ctx->len);
382 af_alg_release_parent(sk);
385 static int hash_accept_parent_nokey(void *private, struct sock *sk)
387 struct crypto_ahash *tfm = private;
388 struct alg_sock *ask = alg_sk(sk);
389 struct hash_ctx *ctx;
390 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
391 unsigned ds = crypto_ahash_digestsize(tfm);
393 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
397 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
399 sock_kfree_s(sk, ctx, len);
403 memset(ctx->result, 0, ds);
407 af_alg_init_completion(&ctx->completion);
411 ahash_request_set_tfm(&ctx->req, tfm);
412 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
413 af_alg_complete, &ctx->completion);
415 sk->sk_destruct = hash_sock_destruct;
420 static int hash_accept_parent(void *private, struct sock *sk)
422 struct crypto_ahash *tfm = private;
424 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
427 return hash_accept_parent_nokey(private, sk);
430 static const struct af_alg_type algif_type_hash = {
432 .release = hash_release,
433 .setkey = hash_setkey,
434 .accept = hash_accept_parent,
435 .accept_nokey = hash_accept_parent_nokey,
436 .ops = &algif_hash_ops,
437 .ops_nokey = &algif_hash_ops_nokey,
442 static int __init algif_hash_init(void)
444 return af_alg_register_type(&algif_type_hash);
447 static void __exit algif_hash_exit(void)
449 int err = af_alg_unregister_type(&algif_type_hash);
453 module_init(algif_hash_init);
454 module_exit(algif_hash_exit);
455 MODULE_LICENSE("GPL");