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 crypto_wait wait;
34 struct ahash_request req;
37 static int hash_alloc_result(struct sock *sk, struct hash_ctx *ctx)
44 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
46 ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
50 memset(ctx->result, 0, ds);
55 static void hash_free_result(struct sock *sk, struct hash_ctx *ctx)
62 ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
64 sock_kzfree_s(sk, ctx->result, ds);
68 static int hash_sendmsg(struct socket *sock, struct msghdr *msg,
71 int limit = ALG_MAX_PAGES * PAGE_SIZE;
72 struct sock *sk = sock->sk;
73 struct alg_sock *ask = alg_sk(sk);
74 struct hash_ctx *ctx = ask->private;
78 if (limit > sk->sk_sndbuf)
79 limit = sk->sk_sndbuf;
83 if ((msg->msg_flags & MSG_MORE))
84 hash_free_result(sk, ctx);
86 err = crypto_wait_req(crypto_ahash_init(&ctx->req), &ctx->wait);
93 while (msg_data_left(msg)) {
94 int len = msg_data_left(msg);
99 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
101 err = copied ? 0 : len;
105 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
107 err = crypto_wait_req(crypto_ahash_update(&ctx->req),
109 af_alg_free_sg(&ctx->sgl);
114 iov_iter_advance(&msg->msg_iter, len);
119 ctx->more = msg->msg_flags & MSG_MORE;
121 err = hash_alloc_result(sk, ctx);
125 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
126 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
133 return err ?: copied;
136 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
137 int offset, size_t size, int flags)
139 struct sock *sk = sock->sk;
140 struct alg_sock *ask = alg_sk(sk);
141 struct hash_ctx *ctx = ask->private;
144 if (flags & MSG_SENDPAGE_NOTLAST)
148 sg_init_table(ctx->sgl.sg, 1);
149 sg_set_page(ctx->sgl.sg, page, size, offset);
151 if (!(flags & MSG_MORE)) {
152 err = hash_alloc_result(sk, ctx);
155 } else if (!ctx->more)
156 hash_free_result(sk, ctx);
158 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
160 if (!(flags & MSG_MORE)) {
162 err = crypto_ahash_finup(&ctx->req);
164 err = crypto_ahash_digest(&ctx->req);
167 err = crypto_ahash_init(&ctx->req);
168 err = crypto_wait_req(err, &ctx->wait);
173 err = crypto_ahash_update(&ctx->req);
176 err = crypto_wait_req(err, &ctx->wait);
180 ctx->more = flags & MSG_MORE;
188 static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
191 struct sock *sk = sock->sk;
192 struct alg_sock *ask = alg_sk(sk);
193 struct hash_ctx *ctx = ask->private;
194 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
201 msg->msg_flags |= MSG_TRUNC;
204 result = ctx->result;
205 err = hash_alloc_result(sk, ctx);
209 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
211 if (!result && !ctx->more) {
212 err = crypto_wait_req(crypto_ahash_init(&ctx->req),
218 if (!result || ctx->more) {
220 err = crypto_wait_req(crypto_ahash_final(&ctx->req),
226 err = memcpy_to_msg(msg, ctx->result, len);
229 hash_free_result(sk, ctx);
235 static int hash_accept(struct socket *sock, struct socket *newsock, int flags,
238 struct sock *sk = sock->sk;
239 struct alg_sock *ask = alg_sk(sk);
240 struct hash_ctx *ctx = ask->private;
241 struct ahash_request *req = &ctx->req;
242 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
244 struct alg_sock *ask2;
245 struct hash_ctx *ctx2;
251 err = more ? crypto_ahash_export(req, state) : 0;
257 err = af_alg_accept(ask->parent, newsock, kern);
263 ctx2 = ask2->private;
269 err = crypto_ahash_import(&ctx2->req, state);
278 static struct proto_ops algif_hash_ops = {
281 .connect = sock_no_connect,
282 .socketpair = sock_no_socketpair,
283 .getname = sock_no_getname,
284 .ioctl = sock_no_ioctl,
285 .listen = sock_no_listen,
286 .shutdown = sock_no_shutdown,
287 .getsockopt = sock_no_getsockopt,
288 .mmap = sock_no_mmap,
289 .bind = sock_no_bind,
290 .setsockopt = sock_no_setsockopt,
291 .poll = sock_no_poll,
293 .release = af_alg_release,
294 .sendmsg = hash_sendmsg,
295 .sendpage = hash_sendpage,
296 .recvmsg = hash_recvmsg,
297 .accept = hash_accept,
300 static int hash_check_key(struct socket *sock)
304 struct alg_sock *pask;
305 struct crypto_ahash *tfm;
306 struct sock *sk = sock->sk;
307 struct alg_sock *ask = alg_sk(sk);
314 pask = alg_sk(ask->parent);
318 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
319 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
338 static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
343 err = hash_check_key(sock);
347 return hash_sendmsg(sock, msg, size);
350 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
351 int offset, size_t size, int flags)
355 err = hash_check_key(sock);
359 return hash_sendpage(sock, page, offset, size, flags);
362 static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
363 size_t ignored, int flags)
367 err = hash_check_key(sock);
371 return hash_recvmsg(sock, msg, ignored, flags);
374 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
375 int flags, bool kern)
379 err = hash_check_key(sock);
383 return hash_accept(sock, newsock, flags, kern);
386 static struct proto_ops algif_hash_ops_nokey = {
389 .connect = sock_no_connect,
390 .socketpair = sock_no_socketpair,
391 .getname = sock_no_getname,
392 .ioctl = sock_no_ioctl,
393 .listen = sock_no_listen,
394 .shutdown = sock_no_shutdown,
395 .getsockopt = sock_no_getsockopt,
396 .mmap = sock_no_mmap,
397 .bind = sock_no_bind,
398 .setsockopt = sock_no_setsockopt,
399 .poll = sock_no_poll,
401 .release = af_alg_release,
402 .sendmsg = hash_sendmsg_nokey,
403 .sendpage = hash_sendpage_nokey,
404 .recvmsg = hash_recvmsg_nokey,
405 .accept = hash_accept_nokey,
408 static void *hash_bind(const char *name, u32 type, u32 mask)
410 return crypto_alloc_ahash(name, type, mask);
413 static void hash_release(void *private)
415 crypto_free_ahash(private);
418 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
420 return crypto_ahash_setkey(private, key, keylen);
423 static void hash_sock_destruct(struct sock *sk)
425 struct alg_sock *ask = alg_sk(sk);
426 struct hash_ctx *ctx = ask->private;
428 hash_free_result(sk, ctx);
429 sock_kfree_s(sk, ctx, ctx->len);
430 af_alg_release_parent(sk);
433 static int hash_accept_parent_nokey(void *private, struct sock *sk)
435 struct crypto_ahash *tfm = private;
436 struct alg_sock *ask = alg_sk(sk);
437 struct hash_ctx *ctx;
438 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
440 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
447 crypto_init_wait(&ctx->wait);
451 ahash_request_set_tfm(&ctx->req, tfm);
452 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
453 crypto_req_done, &ctx->wait);
455 sk->sk_destruct = hash_sock_destruct;
460 static int hash_accept_parent(void *private, struct sock *sk)
462 struct crypto_ahash *tfm = private;
464 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
467 return hash_accept_parent_nokey(private, sk);
470 static const struct af_alg_type algif_type_hash = {
472 .release = hash_release,
473 .setkey = hash_setkey,
474 .accept = hash_accept_parent,
475 .accept_nokey = hash_accept_parent_nokey,
476 .ops = &algif_hash_ops,
477 .ops_nokey = &algif_hash_ops_nokey,
482 static int __init algif_hash_init(void)
484 return af_alg_register_type(&algif_type_hash);
487 static void __exit algif_hash_exit(void)
489 int err = af_alg_unregister_type(&algif_type_hash);
493 module_init(algif_hash_init);
494 module_exit(algif_hash_exit);
495 MODULE_LICENSE("GPL");