Root/crypto/algif_hash.c

1/*
2 * algif_hash: User-space interface for hash algorithms
3 *
4 * This file provides the user-space API for hash algorithms.
5 *
6 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
7 *
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)
11 * any later version.
12 *
13 */
14
15#include <crypto/hash.h>
16#include <crypto/if_alg.h>
17#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/mm.h>
20#include <linux/module.h>
21#include <linux/net.h>
22#include <net/sock.h>
23
24struct hash_ctx {
25    struct af_alg_sgl sgl;
26
27    u8 *result;
28
29    struct af_alg_completion completion;
30
31    unsigned int len;
32    bool more;
33
34    struct ahash_request req;
35};
36
37static int hash_sendmsg(struct kiocb *unused, struct socket *sock,
38            struct msghdr *msg, size_t ignored)
39{
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;
44    unsigned long iovlen;
45    struct iovec *iov;
46    long copied = 0;
47    int err;
48
49    if (limit > sk->sk_sndbuf)
50        limit = sk->sk_sndbuf;
51
52    lock_sock(sk);
53    if (!ctx->more) {
54        err = crypto_ahash_init(&ctx->req);
55        if (err)
56            goto unlock;
57    }
58
59    ctx->more = 0;
60
61    for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
62         iovlen--, iov++) {
63        unsigned long seglen = iov->iov_len;
64        char __user *from = iov->iov_base;
65
66        while (seglen) {
67            int len = min_t(unsigned long, seglen, limit);
68            int newlen;
69
70            newlen = af_alg_make_sg(&ctx->sgl, from, len, 0);
71            if (newlen < 0)
72                goto unlock;
73
74            ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, NULL,
75                        newlen);
76
77            err = af_alg_wait_for_completion(
78                crypto_ahash_update(&ctx->req),
79                &ctx->completion);
80
81            af_alg_free_sg(&ctx->sgl);
82
83            if (err)
84                goto unlock;
85
86            seglen -= newlen;
87            from += newlen;
88            copied += newlen;
89        }
90    }
91
92    err = 0;
93
94    ctx->more = msg->msg_flags & MSG_MORE;
95    if (!ctx->more) {
96        ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
97        err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
98                         &ctx->completion);
99    }
100
101unlock:
102    release_sock(sk);
103
104    return err ?: copied;
105}
106
107static ssize_t hash_sendpage(struct socket *sock, struct page *page,
108                 int offset, size_t size, int flags)
109{
110    struct sock *sk = sock->sk;
111    struct alg_sock *ask = alg_sk(sk);
112    struct hash_ctx *ctx = ask->private;
113    int err;
114
115    lock_sock(sk);
116    sg_init_table(ctx->sgl.sg, 1);
117    sg_set_page(ctx->sgl.sg, page, size, offset);
118
119    ahash_request_set_crypt(&ctx->req, ctx->sgl.sg, ctx->result, size);
120
121    if (!(flags & MSG_MORE)) {
122        if (ctx->more)
123            err = crypto_ahash_finup(&ctx->req);
124        else
125            err = crypto_ahash_digest(&ctx->req);
126    } else {
127        if (!ctx->more) {
128            err = crypto_ahash_init(&ctx->req);
129            if (err)
130                goto unlock;
131        }
132
133        err = crypto_ahash_update(&ctx->req);
134    }
135
136    err = af_alg_wait_for_completion(err, &ctx->completion);
137    if (err)
138        goto unlock;
139
140    ctx->more = flags & MSG_MORE;
141
142unlock:
143    release_sock(sk);
144
145    return err ?: size;
146}
147
148static int hash_recvmsg(struct kiocb *unused, struct socket *sock,
149            struct msghdr *msg, size_t len, int flags)
150{
151    struct sock *sk = sock->sk;
152    struct alg_sock *ask = alg_sk(sk);
153    struct hash_ctx *ctx = ask->private;
154    unsigned ds = crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req));
155    int err;
156
157    if (len > ds)
158        len = ds;
159    else if (len < ds)
160        msg->msg_flags |= MSG_TRUNC;
161
162    lock_sock(sk);
163    if (ctx->more) {
164        ctx->more = 0;
165        ahash_request_set_crypt(&ctx->req, NULL, ctx->result, 0);
166        err = af_alg_wait_for_completion(crypto_ahash_final(&ctx->req),
167                         &ctx->completion);
168        if (err)
169            goto unlock;
170    }
171
172    err = memcpy_toiovec(msg->msg_iov, ctx->result, len);
173
174unlock:
175    release_sock(sk);
176
177    return err ?: len;
178}
179
180static int hash_accept(struct socket *sock, struct socket *newsock, int flags)
181{
182    struct sock *sk = sock->sk;
183    struct alg_sock *ask = alg_sk(sk);
184    struct hash_ctx *ctx = ask->private;
185    struct ahash_request *req = &ctx->req;
186    char state[crypto_ahash_statesize(crypto_ahash_reqtfm(req))];
187    struct sock *sk2;
188    struct alg_sock *ask2;
189    struct hash_ctx *ctx2;
190    int err;
191
192    err = crypto_ahash_export(req, state);
193    if (err)
194        return err;
195
196    err = af_alg_accept(ask->parent, newsock);
197    if (err)
198        return err;
199
200    sk2 = newsock->sk;
201    ask2 = alg_sk(sk2);
202    ctx2 = ask2->private;
203    ctx2->more = 1;
204
205    err = crypto_ahash_import(&ctx2->req, state);
206    if (err) {
207        sock_orphan(sk2);
208        sock_put(sk2);
209    }
210
211    return err;
212}
213
214static struct proto_ops algif_hash_ops = {
215    .family = PF_ALG,
216
217    .connect = sock_no_connect,
218    .socketpair = sock_no_socketpair,
219    .getname = sock_no_getname,
220    .ioctl = sock_no_ioctl,
221    .listen = sock_no_listen,
222    .shutdown = sock_no_shutdown,
223    .getsockopt = sock_no_getsockopt,
224    .mmap = sock_no_mmap,
225    .bind = sock_no_bind,
226    .setsockopt = sock_no_setsockopt,
227    .poll = sock_no_poll,
228
229    .release = af_alg_release,
230    .sendmsg = hash_sendmsg,
231    .sendpage = hash_sendpage,
232    .recvmsg = hash_recvmsg,
233    .accept = hash_accept,
234};
235
236static void *hash_bind(const char *name, u32 type, u32 mask)
237{
238    return crypto_alloc_ahash(name, type, mask);
239}
240
241static void hash_release(void *private)
242{
243    crypto_free_ahash(private);
244}
245
246static int hash_setkey(void *private, const u8 *key, unsigned int keylen)
247{
248    return crypto_ahash_setkey(private, key, keylen);
249}
250
251static void hash_sock_destruct(struct sock *sk)
252{
253    struct alg_sock *ask = alg_sk(sk);
254    struct hash_ctx *ctx = ask->private;
255
256    sock_kfree_s(sk, ctx->result,
257             crypto_ahash_digestsize(crypto_ahash_reqtfm(&ctx->req)));
258    sock_kfree_s(sk, ctx, ctx->len);
259    af_alg_release_parent(sk);
260}
261
262static int hash_accept_parent(void *private, struct sock *sk)
263{
264    struct hash_ctx *ctx;
265    struct alg_sock *ask = alg_sk(sk);
266    unsigned len = sizeof(*ctx) + crypto_ahash_reqsize(private);
267    unsigned ds = crypto_ahash_digestsize(private);
268
269    ctx = sock_kmalloc(sk, len, GFP_KERNEL);
270    if (!ctx)
271        return -ENOMEM;
272
273    ctx->result = sock_kmalloc(sk, ds, GFP_KERNEL);
274    if (!ctx->result) {
275        sock_kfree_s(sk, ctx, len);
276        return -ENOMEM;
277    }
278
279    memset(ctx->result, 0, ds);
280
281    ctx->len = len;
282    ctx->more = 0;
283    af_alg_init_completion(&ctx->completion);
284
285    ask->private = ctx;
286
287    ahash_request_set_tfm(&ctx->req, private);
288    ahash_request_set_callback(&ctx->req, CRYPTO_TFM_REQ_MAY_BACKLOG,
289                   af_alg_complete, &ctx->completion);
290
291    sk->sk_destruct = hash_sock_destruct;
292
293    return 0;
294}
295
296static const struct af_alg_type algif_type_hash = {
297    .bind = hash_bind,
298    .release = hash_release,
299    .setkey = hash_setkey,
300    .accept = hash_accept_parent,
301    .ops = &algif_hash_ops,
302    .name = "hash",
303    .owner = THIS_MODULE
304};
305
306static int __init algif_hash_init(void)
307{
308    return af_alg_register_type(&algif_type_hash);
309}
310
311static void __exit algif_hash_exit(void)
312{
313    int err = af_alg_unregister_type(&algif_type_hash);
314    BUG_ON(err);
315}
316
317module_init(algif_hash_init);
318module_exit(algif_hash_exit);
319MODULE_LICENSE("GPL");
320

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