blob: 442a82c9de7def1f876045d6204da9733c9a5994 [file] [log] [blame]
Thomas Gleixner2874c5f2019-05-27 08:55:01 +02001// SPDX-License-Identifier: GPL-2.0-or-later
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +01002/*
3 * Synchronous Compression operations
4 *
5 * Copyright 2015 LG Electronics Inc.
6 * Copyright (c) 2016, Intel Corporation
7 * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +01008 */
Herbert Xu0a742382023-02-16 18:35:17 +08009
10#include <crypto/internal/acompress.h>
11#include <crypto/internal/scompress.h>
12#include <crypto/scatterwalk.h>
13#include <linux/cryptouser.h>
14#include <linux/err.h>
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010015#include <linux/kernel.h>
16#include <linux/module.h>
Herbert Xu0a742382023-02-16 18:35:17 +080017#include <linux/scatterlist.h>
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010018#include <linux/seq_file.h>
19#include <linux/slab.h>
20#include <linux/string.h>
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010021#include <linux/vmalloc.h>
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010022#include <net/netlink.h>
Herbert Xu0a742382023-02-16 18:35:17 +080023
24#include "compress.h"
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010025
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010026struct scomp_scratch {
27 spinlock_t lock;
28 void *src;
29 void *dst;
30};
31
32static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
33 .lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
34};
35
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010036static const struct crypto_type crypto_scomp_type;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010037static int scomp_scratch_users;
38static DEFINE_MUTEX(scomp_lock);
39
Herbert Xuc0f9e012023-02-16 18:35:28 +080040static int __maybe_unused crypto_scomp_report(
41 struct sk_buff *skb, struct crypto_alg *alg)
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010042{
43 struct crypto_report_comp rscomp;
44
Eric Biggers37db69e2018-11-03 14:56:03 -070045 memset(&rscomp, 0, sizeof(rscomp));
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010046
Eric Biggers37db69e2018-11-03 14:56:03 -070047 strscpy(rscomp.type, "scomp", sizeof(rscomp.type));
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010048
Eric Biggers37db69e2018-11-03 14:56:03 -070049 return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
50 sizeof(rscomp), &rscomp);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010051}
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010052
53static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
Gideon Israel Dsouzad8c34b92016-12-31 21:26:23 +053054 __maybe_unused;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010055
56static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
57{
58 seq_puts(m, "type : scomp\n");
59}
60
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010061static void crypto_scomp_free_scratches(void)
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010062{
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010063 struct scomp_scratch *scratch;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010064 int i;
65
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010066 for_each_possible_cpu(i) {
Sebastian Andrzej Siewior8c3fffe2019-04-12 17:14:15 +020067 scratch = per_cpu_ptr(&scomp_scratch, i);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010068
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010069 vfree(scratch->src);
70 vfree(scratch->dst);
71 scratch->src = NULL;
72 scratch->dst = NULL;
73 }
74}
75
76static int crypto_scomp_alloc_scratches(void)
77{
78 struct scomp_scratch *scratch;
79 int i;
80
81 for_each_possible_cpu(i) {
82 void *mem;
83
Sebastian Andrzej Siewior8c3fffe2019-04-12 17:14:15 +020084 scratch = per_cpu_ptr(&scomp_scratch, i);
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010085
86 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
87 if (!mem)
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010088 goto error;
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010089 scratch->src = mem;
90 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
91 if (!mem)
92 goto error;
93 scratch->dst = mem;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010094 }
95 return 0;
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +010096error:
97 crypto_scomp_free_scratches();
98 return -ENOMEM;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +010099}
100
Ard Biesheuvel6a8487a2017-07-21 16:42:38 +0100101static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
102{
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100103 int ret = 0;
Ard Biesheuvel6a8487a2017-07-21 16:42:38 +0100104
105 mutex_lock(&scomp_lock);
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100106 if (!scomp_scratch_users++)
107 ret = crypto_scomp_alloc_scratches();
Ard Biesheuvel6a8487a2017-07-21 16:42:38 +0100108 mutex_unlock(&scomp_lock);
109
110 return ret;
111}
112
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100113static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
114{
115 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
116 void **tfm_ctx = acomp_tfm_ctx(tfm);
117 struct crypto_scomp *scomp = *tfm_ctx;
118 void **ctx = acomp_request_ctx(req);
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100119 struct scomp_scratch *scratch;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100120 int ret;
121
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100122 if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
123 return -EINVAL;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100124
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100125 if (req->dst && !req->dlen)
126 return -EINVAL;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100127
128 if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
129 req->dlen = SCOMP_SCRATCH_SIZE;
130
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100131 scratch = raw_cpu_ptr(&scomp_scratch);
132 spin_lock(&scratch->lock);
133
134 scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100135 if (dir)
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100136 ret = crypto_scomp_compress(scomp, scratch->src, req->slen,
137 scratch->dst, &req->dlen, *ctx);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100138 else
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100139 ret = crypto_scomp_decompress(scomp, scratch->src, req->slen,
140 scratch->dst, &req->dlen, *ctx);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100141 if (!ret) {
142 if (!req->dst) {
Bart Van Assche8cd579d2018-01-05 08:26:47 -0800143 req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
Sebastian Andrzej Siewior6a4d1b12019-03-29 14:09:55 +0100144 if (!req->dst) {
145 ret = -ENOMEM;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100146 goto out;
Sebastian Andrzej Siewior6a4d1b12019-03-29 14:09:55 +0100147 }
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100148 }
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100149 scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen,
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100150 1);
151 }
152out:
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100153 spin_unlock(&scratch->lock);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100154 return ret;
155}
156
157static int scomp_acomp_compress(struct acomp_req *req)
158{
159 return scomp_acomp_comp_decomp(req, 1);
160}
161
162static int scomp_acomp_decompress(struct acomp_req *req)
163{
164 return scomp_acomp_comp_decomp(req, 0);
165}
166
167static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
168{
169 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
170
171 crypto_free_scomp(*ctx);
Ard Biesheuvel6a8487a2017-07-21 16:42:38 +0100172
173 mutex_lock(&scomp_lock);
Sebastian Andrzej Siewior71052dc2019-03-29 14:09:56 +0100174 if (!--scomp_scratch_users)
175 crypto_scomp_free_scratches();
Ard Biesheuvel6a8487a2017-07-21 16:42:38 +0100176 mutex_unlock(&scomp_lock);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100177}
178
179int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
180{
181 struct crypto_alg *calg = tfm->__crt_alg;
182 struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
183 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
184 struct crypto_scomp *scomp;
185
186 if (!crypto_mod_get(calg))
187 return -EAGAIN;
188
189 scomp = crypto_create_tfm(calg, &crypto_scomp_type);
190 if (IS_ERR(scomp)) {
191 crypto_mod_put(calg);
192 return PTR_ERR(scomp);
193 }
194
195 *ctx = scomp;
196 tfm->exit = crypto_exit_scomp_ops_async;
197
198 crt->compress = scomp_acomp_compress;
199 crt->decompress = scomp_acomp_decompress;
Bart Van Assche8cd579d2018-01-05 08:26:47 -0800200 crt->dst_free = sgl_free;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100201 crt->reqsize = sizeof(void *);
202
203 return 0;
204}
205
206struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
207{
208 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
209 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
210 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
211 struct crypto_scomp *scomp = *tfm_ctx;
212 void *ctx;
213
214 ctx = crypto_scomp_alloc_ctx(scomp);
215 if (IS_ERR(ctx)) {
216 kfree(req);
217 return NULL;
218 }
219
220 *req->__ctx = ctx;
221
222 return req;
223}
224
225void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
226{
227 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
228 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
229 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
230 struct crypto_scomp *scomp = *tfm_ctx;
231 void *ctx = *req->__ctx;
232
233 if (ctx)
234 crypto_scomp_free_ctx(scomp, ctx);
235}
236
237static const struct crypto_type crypto_scomp_type = {
238 .extsize = crypto_alg_extsize,
239 .init_tfm = crypto_scomp_init_tfm,
240#ifdef CONFIG_PROC_FS
241 .show = crypto_scomp_show,
242#endif
Ondrej Mosnacekb8969a12023-05-02 10:02:33 +0200243#if IS_ENABLED(CONFIG_CRYPTO_USER)
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100244 .report = crypto_scomp_report,
Herbert Xuc0f9e012023-02-16 18:35:28 +0800245#endif
Herbert Xu0a742382023-02-16 18:35:17 +0800246#ifdef CONFIG_CRYPTO_STATS
247 .report_stat = crypto_acomp_report_stat,
248#endif
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100249 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
250 .maskset = CRYPTO_ALG_TYPE_MASK,
251 .type = CRYPTO_ALG_TYPE_SCOMPRESS,
252 .tfmsize = offsetof(struct crypto_scomp, base),
253};
254
255int crypto_register_scomp(struct scomp_alg *alg)
256{
Herbert Xu0a742382023-02-16 18:35:17 +0800257 struct crypto_alg *base = &alg->calg.base;
258
259 comp_prepare_alg(&alg->calg);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100260
261 base->cra_type = &crypto_scomp_type;
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100262 base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
263
Ard Biesheuvel6a8487a2017-07-21 16:42:38 +0100264 return crypto_register_alg(base);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100265}
266EXPORT_SYMBOL_GPL(crypto_register_scomp);
267
Eric Biggersc6d633a2019-12-15 15:51:19 -0800268void crypto_unregister_scomp(struct scomp_alg *alg)
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100269{
Eric Biggersc6d633a2019-12-15 15:51:19 -0800270 crypto_unregister_alg(&alg->base);
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100271}
272EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
273
Giovanni Cabiddu3de4f5e2017-04-21 21:54:29 +0100274int crypto_register_scomps(struct scomp_alg *algs, int count)
275{
276 int i, ret;
277
278 for (i = 0; i < count; i++) {
279 ret = crypto_register_scomp(&algs[i]);
280 if (ret)
281 goto err;
282 }
283
284 return 0;
285
286err:
287 for (--i; i >= 0; --i)
288 crypto_unregister_scomp(&algs[i]);
289
290 return ret;
291}
292EXPORT_SYMBOL_GPL(crypto_register_scomps);
293
294void crypto_unregister_scomps(struct scomp_alg *algs, int count)
295{
296 int i;
297
298 for (i = count - 1; i >= 0; --i)
299 crypto_unregister_scomp(&algs[i]);
300}
301EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
302
Giovanni Cabiddu1ab53a72016-10-21 13:19:48 +0100303MODULE_LICENSE("GPL");
304MODULE_DESCRIPTION("Synchronous compression type");