1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * algif_skcipher: User-space interface for skcipher algorithms
5 * This file provides the user-space API for symmetric key ciphers.
7 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
9 * The following concept of the memory management is used:
11 * The kernel maintains two SGLs, the TX SGL and the RX SGL. The TX SGL is
12 * filled by user space with the data submitted via sendpage/sendmsg. Filling
13 * up the TX SGL does not cause a crypto operation -- the data will only be
14 * tracked by the kernel. Upon receipt of one recvmsg call, the caller must
15 * provide a buffer which is tracked with the RX SGL.
17 * During the processing of the recvmsg operation, the cipher request is
18 * allocated and prepared. As part of the recvmsg operation, the processed
19 * TX buffers are extracted from the TX SGL into a separate SGL.
21 * After the completion of the crypto operation, the RX SGL and the cipher
22 * request is released. The extracted TX SGL parts are released together with
26 #include <crypto/scatterwalk.h>
27 #include <crypto/skcipher.h>
28 #include <crypto/if_alg.h>
29 #include <linux/init.h>
30 #include <linux/list.h>
31 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/net.h>
37 static int skcipher_sendmsg(struct socket *sock, struct msghdr *msg,
40 struct sock *sk = sock->sk;
41 struct alg_sock *ask = alg_sk(sk);
42 struct sock *psk = ask->parent;
43 struct alg_sock *pask = alg_sk(psk);
44 struct crypto_skcipher *tfm = pask->private;
45 unsigned ivsize = crypto_skcipher_ivsize(tfm);
47 return af_alg_sendmsg(sock, msg, size, ivsize);
50 static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
51 size_t ignored, int flags)
53 struct sock *sk = sock->sk;
54 struct alg_sock *ask = alg_sk(sk);
55 struct sock *psk = ask->parent;
56 struct alg_sock *pask = alg_sk(psk);
57 struct af_alg_ctx *ctx = ask->private;
58 struct crypto_skcipher *tfm = pask->private;
59 unsigned int bs = crypto_skcipher_chunksize(tfm);
60 struct af_alg_async_req *areq;
64 if (!ctx->init || (ctx->more && ctx->used < bs)) {
65 err = af_alg_wait_for_data(sk, flags, bs);
70 /* Allocate cipher request for current operation. */
71 areq = af_alg_alloc_areq(sk, sizeof(struct af_alg_async_req) +
72 crypto_skcipher_reqsize(tfm));
76 /* convert iovecs of output buffers into RX SGL */
77 err = af_alg_get_rsgl(sk, msg, flags, areq, ctx->used, &len);
82 * If more buffers are to be expected to be processed, process only
83 * full block size buffers.
85 if (ctx->more || len < ctx->used)
89 * Create a per request TX SGL for this request which tracks the
90 * SG entries from the global TX SGL.
92 areq->tsgl_entries = af_alg_count_tsgl(sk, len, 0);
93 if (!areq->tsgl_entries)
94 areq->tsgl_entries = 1;
95 areq->tsgl = sock_kmalloc(sk, array_size(sizeof(*areq->tsgl),
102 sg_init_table(areq->tsgl, areq->tsgl_entries);
103 af_alg_pull_tsgl(sk, len, areq->tsgl, 0);
105 /* Initialize the crypto operation */
106 skcipher_request_set_tfm(&areq->cra_u.skcipher_req, tfm);
107 skcipher_request_set_crypt(&areq->cra_u.skcipher_req, areq->tsgl,
108 areq->first_rsgl.sgl.sg, len, ctx->iv);
110 if (msg->msg_iocb && !is_sync_kiocb(msg->msg_iocb)) {
113 areq->iocb = msg->msg_iocb;
115 /* Remember output size that will be generated. */
118 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
119 CRYPTO_TFM_REQ_MAY_SLEEP,
120 af_alg_async_cb, areq);
122 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
123 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req);
125 /* AIO operation in progress */
126 if (err == -EINPROGRESS)
131 /* Synchronous operation */
132 skcipher_request_set_callback(&areq->cra_u.skcipher_req,
133 CRYPTO_TFM_REQ_MAY_SLEEP |
134 CRYPTO_TFM_REQ_MAY_BACKLOG,
135 crypto_req_done, &ctx->wait);
136 err = crypto_wait_req(ctx->enc ?
137 crypto_skcipher_encrypt(&areq->cra_u.skcipher_req) :
138 crypto_skcipher_decrypt(&areq->cra_u.skcipher_req),
144 af_alg_free_resources(areq);
146 return err ? err : len;
149 static int skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
150 size_t ignored, int flags)
152 struct sock *sk = sock->sk;
156 while (msg_data_left(msg)) {
157 int err = _skcipher_recvmsg(sock, msg, ignored, flags);
160 * This error covers -EIOCBQUEUED which implies that we can
161 * only handle one AIO request. If the caller wants to have
162 * multiple AIO requests in parallel, he must make multiple
163 * separate AIO calls.
165 * Also return the error if no data has been processed so far.
168 if (err == -EIOCBQUEUED || !ret)
177 af_alg_wmem_wakeup(sk);
182 static struct proto_ops algif_skcipher_ops = {
185 .connect = sock_no_connect,
186 .socketpair = sock_no_socketpair,
187 .getname = sock_no_getname,
188 .ioctl = sock_no_ioctl,
189 .listen = sock_no_listen,
190 .shutdown = sock_no_shutdown,
191 .mmap = sock_no_mmap,
192 .bind = sock_no_bind,
193 .accept = sock_no_accept,
195 .release = af_alg_release,
196 .sendmsg = skcipher_sendmsg,
197 .sendpage = af_alg_sendpage,
198 .recvmsg = skcipher_recvmsg,
202 static int skcipher_check_key(struct socket *sock)
206 struct alg_sock *pask;
207 struct crypto_skcipher *tfm;
208 struct sock *sk = sock->sk;
209 struct alg_sock *ask = alg_sk(sk);
212 if (!atomic_read(&ask->nokey_refcnt))
216 pask = alg_sk(ask->parent);
220 lock_sock_nested(psk, SINGLE_DEPTH_NESTING);
221 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
224 atomic_dec(&pask->nokey_refcnt);
225 atomic_set(&ask->nokey_refcnt, 0);
237 static int skcipher_sendmsg_nokey(struct socket *sock, struct msghdr *msg,
242 err = skcipher_check_key(sock);
246 return skcipher_sendmsg(sock, msg, size);
249 static ssize_t skcipher_sendpage_nokey(struct socket *sock, struct page *page,
250 int offset, size_t size, int flags)
254 err = skcipher_check_key(sock);
258 return af_alg_sendpage(sock, page, offset, size, flags);
261 static int skcipher_recvmsg_nokey(struct socket *sock, struct msghdr *msg,
262 size_t ignored, int flags)
266 err = skcipher_check_key(sock);
270 return skcipher_recvmsg(sock, msg, ignored, flags);
273 static struct proto_ops algif_skcipher_ops_nokey = {
276 .connect = sock_no_connect,
277 .socketpair = sock_no_socketpair,
278 .getname = sock_no_getname,
279 .ioctl = sock_no_ioctl,
280 .listen = sock_no_listen,
281 .shutdown = sock_no_shutdown,
282 .mmap = sock_no_mmap,
283 .bind = sock_no_bind,
284 .accept = sock_no_accept,
286 .release = af_alg_release,
287 .sendmsg = skcipher_sendmsg_nokey,
288 .sendpage = skcipher_sendpage_nokey,
289 .recvmsg = skcipher_recvmsg_nokey,
293 static void *skcipher_bind(const char *name, u32 type, u32 mask)
295 return crypto_alloc_skcipher(name, type, mask);
298 static void skcipher_release(void *private)
300 crypto_free_skcipher(private);
303 static int skcipher_setkey(void *private, const u8 *key, unsigned int keylen)
305 return crypto_skcipher_setkey(private, key, keylen);
308 static void skcipher_sock_destruct(struct sock *sk)
310 struct alg_sock *ask = alg_sk(sk);
311 struct af_alg_ctx *ctx = ask->private;
312 struct sock *psk = ask->parent;
313 struct alg_sock *pask = alg_sk(psk);
314 struct crypto_skcipher *tfm = pask->private;
316 af_alg_pull_tsgl(sk, ctx->used, NULL, 0);
317 sock_kzfree_s(sk, ctx->iv, crypto_skcipher_ivsize(tfm));
318 sock_kfree_s(sk, ctx, ctx->len);
319 af_alg_release_parent(sk);
322 static int skcipher_accept_parent_nokey(void *private, struct sock *sk)
324 struct af_alg_ctx *ctx;
325 struct alg_sock *ask = alg_sk(sk);
326 struct crypto_skcipher *tfm = private;
327 unsigned int len = sizeof(*ctx);
329 ctx = sock_kmalloc(sk, len, GFP_KERNEL);
334 ctx->iv = sock_kmalloc(sk, crypto_skcipher_ivsize(tfm),
337 sock_kfree_s(sk, ctx, len);
340 memset(ctx->iv, 0, crypto_skcipher_ivsize(tfm));
342 INIT_LIST_HEAD(&ctx->tsgl_list);
344 crypto_init_wait(&ctx->wait);
348 sk->sk_destruct = skcipher_sock_destruct;
353 static int skcipher_accept_parent(void *private, struct sock *sk)
355 struct crypto_skcipher *tfm = private;
357 if (crypto_skcipher_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
360 return skcipher_accept_parent_nokey(private, sk);
363 static const struct af_alg_type algif_type_skcipher = {
364 .bind = skcipher_bind,
365 .release = skcipher_release,
366 .setkey = skcipher_setkey,
367 .accept = skcipher_accept_parent,
368 .accept_nokey = skcipher_accept_parent_nokey,
369 .ops = &algif_skcipher_ops,
370 .ops_nokey = &algif_skcipher_ops_nokey,
375 static int __init algif_skcipher_init(void)
377 return af_alg_register_type(&algif_type_skcipher);
380 static void __exit algif_skcipher_exit(void)
382 int err = af_alg_unregister_type(&algif_type_skcipher);
386 module_init(algif_skcipher_init);
387 module_exit(algif_skcipher_exit);
388 MODULE_LICENSE("GPL");