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_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 = af_alg_wait_for_completion(crypto_ahash_init(&ctx->req),
94 while (msg_data_left(msg)) {
95 int len = msg_data_left(msg);
100 len = af_alg_make_sg(&ctx->sgl, &msg->msg_iter, len);
102 err = copied ? 0 : len;
106 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL, len);
108 err = af_alg_wait_for_completion(crypto_ahash_update(&ctx->req),
110 af_alg_free_sg(&ctx->sgl);
115 iov_iter_advance(&msg->msg_iter, len);
120 ctx->more = msg->msg_flags & MSG_MORE;
122 err = hash_alloc_result(sk, ctx);
126 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
127 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
134 return err ?: copied;
137 static ssize_t hash_sendpage(struct socket *sock, struct page *page,
138 int offset, size_t size, int flags)
140 struct sock *sk = sock->sk;
141 struct alg_sock *ask = alg_sk(sk);
142 struct hash_ctx *ctx = ask->private;
145 if (flags & MSG_SENDPAGE_NOTLAST)
149 sg_init_table(ctx->sgl.sg, 1);
150 sg_set_page(ctx->sgl.sg, page, size, offset);
152 if (!(flags & MSG_MORE)) {
153 err = hash_alloc_result(sk, ctx);
156 } else if (!ctx->more)
157 hash_free_result(sk, ctx);
159 ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
161 if (!(flags & MSG_MORE)) {
163 err = crypto_ahash_finup(&ctx->req);
165 err = crypto_ahash_digest(&ctx->req);
168 err = crypto_ahash_init(&ctx->req);
169 err = af_alg_wait_for_completion(err, &ctx->completion);
174 err = crypto_ahash_update(&ctx->req);
177 err = af_alg_wait_for_completion(err, &ctx->completion);
181 ctx->more = flags & MSG_MORE;
189 static int hash_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
192 struct sock *sk = sock->sk;
193 struct alg_sock *ask = alg_sk(sk);
194 struct hash_ctx *ctx = ask->private;
195 unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
202 msg->msg_flags |= MSG_TRUNC;
205 result = ctx->result;
206 err = hash_alloc_result(sk, ctx);
210 ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
212 if (!result && !ctx->more) {
213 err = af_alg_wait_for_completion(
214 crypto_ahash_init(&ctx->req),
220 if (!result || ctx->more) {
222 err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
228 err = memcpy_to_msg(msg, ctx->result, len);
231 hash_free_result(sk, ctx);
237 static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
239 struct sock *sk = sock->sk;
240 struct alg_sock *ask = alg_sk(sk);
241 struct hash_ctx *ctx = ask->private;
242 struct ahash_request *req = &ctx->req;
243 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
245 struct alg_sock *ask2;
246 struct hash_ctx *ctx2;
252 err = more ? crypto_ahash_export(req, state) : 0;
258 err = af_alg_accept(ask->parent, newsock);
264 ctx2 = ask2->private;
270 err = crypto_ahash_import(&ctx2->req, state);
279 static struct proto_ops algif_hash_ops = {
282 .connect = sock_no_connect,
283 .socketpair = sock_no_socketpair,
284 .getname = sock_no_getname,
285 .ioctl = sock_no_ioctl,
286 .listen = sock_no_listen,
287 .shutdown = sock_no_shutdown,
288 .getsockopt = sock_no_getsockopt,
289 .mmap = sock_no_mmap,
290 .bind = sock_no_bind,
291 .setsockopt = sock_no_setsockopt,
292 .poll = sock_no_poll,
294 .release = af_alg_release,
295 .sendmsg = hash_sendmsg,
296 .sendpage = hash_sendpage,
297 .recvmsg = hash_recvmsg,
298 .accept = hash_accept,
301 static int hash_check_key(struct socket *sock)
305 struct alg_sock *pask;
306 struct crypto_ahash *tfm;
307 struct sock *sk = sock->sk;
308 struct alg_sock *ask = alg_sk(sk);
315 pask = alg_sk(ask->parent);
319 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
320 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
339 static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
344 err = hash_check_key(sock);
348 return hash_sendmsg(sock, msg, size);
351 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
352 int offset, size_t size, int flags)
356 err = hash_check_key(sock);
360 return hash_sendpage(sock, page, offset, size, flags);
363 static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
364 size_t ignored, int flags)
368 err = hash_check_key(sock);
372 return hash_recvmsg(sock, msg, ignored, flags);
375 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
380 err = hash_check_key(sock);
384 return hash_accept(sock, newsock, flags);
387 static struct proto_ops algif_hash_ops_nokey = {
390 .connect = sock_no_connect,
391 .socketpair = sock_no_socketpair,
392 .getname = sock_no_getname,
393 .ioctl = sock_no_ioctl,
394 .listen = sock_no_listen,
395 .shutdown = sock_no_shutdown,
396 .getsockopt = sock_no_getsockopt,
397 .mmap = sock_no_mmap,
398 .bind = sock_no_bind,
399 .setsockopt = sock_no_setsockopt,
400 .poll = sock_no_poll,
402 .release = af_alg_release,
403 .sendmsg = hash_sendmsg_nokey,
404 .sendpage = hash_sendpage_nokey,
405 .recvmsg = hash_recvmsg_nokey,
406 .accept = hash_accept_nokey,
409 static void *hash_bind(const char *name, u32 type, u32 mask)
411 return crypto_alloc_ahash(name, type, mask);
414 static void hash_release(void *private)
416 crypto_free_ahash(private);
419 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
421 return crypto_ahash_setkey(private, key, keylen);
424 static void hash_sock_destruct(struct sock *sk)
426 struct alg_sock *ask = alg_sk(sk);
427 struct hash_ctx *ctx = ask->private;
429 hash_free_result(sk, ctx);
430 sock_kfree_s(sk, ctx, ctx->len);
431 af_alg_release_parent(sk);
434 static int hash_accept_parent_nokey(void *private, struct sock *sk)
436 struct crypto_ahash *tfm = private;
437 struct alg_sock *ask = alg_sk(sk);
438 struct hash_ctx *ctx;
439 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
441 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
448 af_alg_init_completion(&ctx->completion);
452 ahash_request_set_tfm(&ctx->req, tfm);
453 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
454 af_alg_complete, &ctx->completion);
456 sk->sk_destruct = hash_sock_destruct;
461 static int hash_accept_parent(void *private, struct sock *sk)
463 struct crypto_ahash *tfm = private;
465 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
468 return hash_accept_parent_nokey(private, sk);
471 static const struct af_alg_type algif_type_hash = {
473 .release = hash_release,
474 .setkey = hash_setkey,
475 .accept = hash_accept_parent,
476 .accept_nokey = hash_accept_parent_nokey,
477 .ops = &algif_hash_ops,
478 .ops_nokey = &algif_hash_ops_nokey,
483 static int __init algif_hash_init(void)
485 return af_alg_register_type(&algif_type_hash);
488 static void __exit algif_hash_exit(void)
490 int err = af_alg_unregister_type(&algif_type_hash);
494 module_init(algif_hash_init);
495 module_exit(algif_hash_exit);
496 MODULE_LICENSE("GPL");