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,
240 struct sock *sk = sock->sk;
241 struct alg_sock *ask = alg_sk(sk);
242 struct hash_ctx *ctx = ask->private;
243 struct ahash_request *req = &ctx->req;
244 char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req)) ? : 1];
246 struct alg_sock *ask2;
247 struct hash_ctx *ctx2;
253 err = more ? crypto_ahash_export(req, state) : 0;
259 err = af_alg_accept(ask->parent, newsock, kern);
265 ctx2 = ask2->private;
271 err = crypto_ahash_import(&ctx2->req, state);
280 static struct proto_ops algif_hash_ops = {
283 .connect = sock_no_connect,
284 .socketpair = sock_no_socketpair,
285 .getname = sock_no_getname,
286 .ioctl = sock_no_ioctl,
287 .listen = sock_no_listen,
288 .shutdown = sock_no_shutdown,
289 .getsockopt = sock_no_getsockopt,
290 .mmap = sock_no_mmap,
291 .bind = sock_no_bind,
292 .setsockopt = sock_no_setsockopt,
293 .poll = sock_no_poll,
295 .release = af_alg_release,
296 .sendmsg = hash_sendmsg,
297 .sendpage = hash_sendpage,
298 .recvmsg = hash_recvmsg,
299 .accept = hash_accept,
302 static int hash_check_key(struct socket *sock)
306 struct alg_sock *pask;
307 struct crypto_ahash *tfm;
308 struct sock *sk = sock->sk;
309 struct alg_sock *ask = alg_sk(sk);
316 pask = alg_sk(ask->parent);
320 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
321 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
340 static int hash_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
345 err = hash_check_key(sock);
349 return hash_sendmsg(sock, msg, size);
352 static ssize_t hash_sendpage_nokey(struct socket *sock, struct page *page,
353 int offset, size_t size, int flags)
357 err = hash_check_key(sock);
361 return hash_sendpage(sock, page, offset, size, flags);
364 static int hash_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
365 size_t ignored, int flags)
369 err = hash_check_key(sock);
373 return hash_recvmsg(sock, msg, ignored, flags);
376 static int hash_accept_nokey(struct socket *sock, struct socket *newsock,
377 int flags, bool kern)
381 err = hash_check_key(sock);
385 return hash_accept(sock, newsock, flags, kern);
388 static struct proto_ops algif_hash_ops_nokey = {
391 .connect = sock_no_connect,
392 .socketpair = sock_no_socketpair,
393 .getname = sock_no_getname,
394 .ioctl = sock_no_ioctl,
395 .listen = sock_no_listen,
396 .shutdown = sock_no_shutdown,
397 .getsockopt = sock_no_getsockopt,
398 .mmap = sock_no_mmap,
399 .bind = sock_no_bind,
400 .setsockopt = sock_no_setsockopt,
401 .poll = sock_no_poll,
403 .release = af_alg_release,
404 .sendmsg = hash_sendmsg_nokey,
405 .sendpage = hash_sendpage_nokey,
406 .recvmsg = hash_recvmsg_nokey,
407 .accept = hash_accept_nokey,
410 static void *hash_bind(const char *name, u32 type, u32 mask)
412 return crypto_alloc_ahash(name, type, mask);
415 static void hash_release(void *private)
417 crypto_free_ahash(private);
420 static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
422 return crypto_ahash_setkey(private, key, keylen);
425 static void hash_sock_destruct(struct sock *sk)
427 struct alg_sock *ask = alg_sk(sk);
428 struct hash_ctx *ctx = ask->private;
430 hash_free_result(sk, ctx);
431 sock_kfree_s(sk, ctx, ctx->len);
432 af_alg_release_parent(sk);
435 static int hash_accept_parent_nokey(void *private, struct sock *sk)
437 struct crypto_ahash *tfm = private;
438 struct alg_sock *ask = alg_sk(sk);
439 struct hash_ctx *ctx;
440 unsigned int len = sizeof(*ctx) + crypto_ahash_reqsize(tfm);
442 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
449 af_alg_init_completion(&ctx->completion);
453 ahash_request_set_tfm(&ctx->req, tfm);
454 ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
455 af_alg_complete, &ctx->completion);
457 sk->sk_destruct = hash_sock_destruct;
462 static int hash_accept_parent(void *private, struct sock *sk)
464 struct crypto_ahash *tfm = private;
466 if (crypto_ahash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
469 return hash_accept_parent_nokey(private, sk);
472 static const struct af_alg_type algif_type_hash = {
474 .release = hash_release,
475 .setkey = hash_setkey,
476 .accept = hash_accept_parent,
477 .accept_nokey = hash_accept_parent_nokey,
478 .ops = &algif_hash_ops,
479 .ops_nokey = &algif_hash_ops_nokey,
484 static int __init algif_hash_init(void)
486 return af_alg_register_type(&algif_type_hash);
489 static void __exit algif_hash_exit(void)
491 int err = af_alg_unregister_type(&algif_type_hash);
495 module_init(algif_hash_init);
496 module_exit(algif_hash_exit);
497 MODULE_LICENSE("GPL");