1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
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>
8 */
9
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>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/scatterlist.h>
18#include <linux/seq_file.h>
19#include <linux/slab.h>
20#include <linux/string.h>
21#include <linux/vmalloc.h>
22#include <net/netlink.h>
23
24#include "compress.h"
25
26struct 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
36static const struct crypto_type crypto_scomp_type;
37static int scomp_scratch_users;
38static DEFINE_MUTEX(scomp_lock);
39
40static int __maybe_unused crypto_scomp_report(
41 struct sk_buff *skb, struct crypto_alg *alg)
42{
43 struct crypto_report_comp rscomp;
44
45 memset(&rscomp, 0, sizeof(rscomp));
46
47 strscpy(p: rscomp.type, q: "scomp", size: sizeof(rscomp.type));
48
49 return nla_put(skb, attrtype: CRYPTOCFGA_REPORT_COMPRESS,
50 attrlen: sizeof(rscomp), data: &rscomp);
51}
52
53static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
54 __maybe_unused;
55
56static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
57{
58 seq_puts(m, s: "type : scomp\n");
59}
60
61static void crypto_scomp_free_scratches(void)
62{
63 struct scomp_scratch *scratch;
64 int i;
65
66 for_each_possible_cpu(i) {
67 scratch = per_cpu_ptr(&scomp_scratch, i);
68
69 vfree(addr: scratch->src);
70 vfree(addr: 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
84 scratch = per_cpu_ptr(&scomp_scratch, i);
85
86 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(cpu: i));
87 if (!mem)
88 goto error;
89 scratch->src = mem;
90 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(cpu: i));
91 if (!mem)
92 goto error;
93 scratch->dst = mem;
94 }
95 return 0;
96error:
97 crypto_scomp_free_scratches();
98 return -ENOMEM;
99}
100
101static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
102{
103 int ret = 0;
104
105 mutex_lock(&scomp_lock);
106 if (!scomp_scratch_users++)
107 ret = crypto_scomp_alloc_scratches();
108 mutex_unlock(lock: &scomp_lock);
109
110 return ret;
111}
112
113static 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);
119 struct scomp_scratch *scratch;
120 int ret;
121
122 if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
123 return -EINVAL;
124
125 if (req->dst && !req->dlen)
126 return -EINVAL;
127
128 if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
129 req->dlen = SCOMP_SCRATCH_SIZE;
130
131 scratch = raw_cpu_ptr(&scomp_scratch);
132 spin_lock(lock: &scratch->lock);
133
134 scatterwalk_map_and_copy(buf: scratch->src, sg: req->src, start: 0, nbytes: req->slen, out: 0);
135 if (dir)
136 ret = crypto_scomp_compress(tfm: scomp, src: scratch->src, slen: req->slen,
137 dst: scratch->dst, dlen: &req->dlen, ctx: *ctx);
138 else
139 ret = crypto_scomp_decompress(tfm: scomp, src: scratch->src, slen: req->slen,
140 dst: scratch->dst, dlen: &req->dlen, ctx: *ctx);
141 if (!ret) {
142 if (!req->dst) {
143 req->dst = sgl_alloc(length: req->dlen, GFP_ATOMIC, NULL);
144 if (!req->dst) {
145 ret = -ENOMEM;
146 goto out;
147 }
148 }
149 scatterwalk_map_and_copy(buf: scratch->dst, sg: req->dst, start: 0, nbytes: req->dlen,
150 out: 1);
151 }
152out:
153 spin_unlock(lock: &scratch->lock);
154 return ret;
155}
156
157static int scomp_acomp_compress(struct acomp_req *req)
158{
159 return scomp_acomp_comp_decomp(req, dir: 1);
160}
161
162static int scomp_acomp_decompress(struct acomp_req *req)
163{
164 return scomp_acomp_comp_decomp(req, dir: 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(tfm: *ctx);
172
173 mutex_lock(&scomp_lock);
174 if (!--scomp_scratch_users)
175 crypto_scomp_free_scratches();
176 mutex_unlock(lock: &scomp_lock);
177}
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(alg: calg))
187 return -EAGAIN;
188
189 scomp = crypto_create_tfm(alg: calg, frontend: &crypto_scomp_type);
190 if (IS_ERR(ptr: scomp)) {
191 crypto_mod_put(alg: calg);
192 return PTR_ERR(ptr: 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;
200 crt->dst_free = sgl_free;
201 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(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(tfm: scomp);
215 if (IS_ERR(ptr: ctx)) {
216 kfree(objp: 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(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(tfm: 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
243#if IS_ENABLED(CONFIG_CRYPTO_USER)
244 .report = crypto_scomp_report,
245#endif
246#ifdef CONFIG_CRYPTO_STATS
247 .report_stat = crypto_acomp_report_stat,
248#endif
249 .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{
257 struct crypto_alg *base = &alg->calg.base;
258
259 comp_prepare_alg(alg: &alg->calg);
260
261 base->cra_type = &crypto_scomp_type;
262 base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
263
264 return crypto_register_alg(alg: base);
265}
266EXPORT_SYMBOL_GPL(crypto_register_scomp);
267
268void crypto_unregister_scomp(struct scomp_alg *alg)
269{
270 crypto_unregister_alg(alg: &alg->base);
271}
272EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
273
274int 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
303MODULE_LICENSE("GPL");
304MODULE_DESCRIPTION("Synchronous compression type");
305

source code of linux/crypto/scompress.c