Loading...
1/*
2 * Synchronous Compression operations
3 *
4 * Copyright 2015 LG Electronics Inc.
5 * Copyright (c) 2016, Intel Corporation
6 * Author: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
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#include <linux/errno.h>
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/seq_file.h>
18#include <linux/slab.h>
19#include <linux/string.h>
20#include <linux/crypto.h>
21#include <linux/compiler.h>
22#include <linux/vmalloc.h>
23#include <crypto/algapi.h>
24#include <linux/cryptouser.h>
25#include <net/netlink.h>
26#include <linux/scatterlist.h>
27#include <crypto/scatterwalk.h>
28#include <crypto/internal/acompress.h>
29#include <crypto/internal/scompress.h>
30#include "internal.h"
31
32static const struct crypto_type crypto_scomp_type;
33static void * __percpu *scomp_src_scratches;
34static void * __percpu *scomp_dst_scratches;
35static int scomp_scratch_users;
36static DEFINE_MUTEX(scomp_lock);
37
38#ifdef CONFIG_NET
39static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
40{
41 struct crypto_report_comp rscomp;
42
43 strncpy(rscomp.type, "scomp", sizeof(rscomp.type));
44
45 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
46 sizeof(struct crypto_report_comp), &rscomp))
47 goto nla_put_failure;
48 return 0;
49
50nla_put_failure:
51 return -EMSGSIZE;
52}
53#else
54static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
55{
56 return -ENOSYS;
57}
58#endif
59
60static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
61 __maybe_unused;
62
63static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
64{
65 seq_puts(m, "type : scomp\n");
66}
67
68static void crypto_scomp_free_scratches(void * __percpu *scratches)
69{
70 int i;
71
72 if (!scratches)
73 return;
74
75 for_each_possible_cpu(i)
76 vfree(*per_cpu_ptr(scratches, i));
77
78 free_percpu(scratches);
79}
80
81static void * __percpu *crypto_scomp_alloc_scratches(void)
82{
83 void * __percpu *scratches;
84 int i;
85
86 scratches = alloc_percpu(void *);
87 if (!scratches)
88 return NULL;
89
90 for_each_possible_cpu(i) {
91 void *scratch;
92
93 scratch = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
94 if (!scratch)
95 goto error;
96 *per_cpu_ptr(scratches, i) = scratch;
97 }
98
99 return scratches;
100
101error:
102 crypto_scomp_free_scratches(scratches);
103 return NULL;
104}
105
106static void crypto_scomp_free_all_scratches(void)
107{
108 if (!--scomp_scratch_users) {
109 crypto_scomp_free_scratches(scomp_src_scratches);
110 crypto_scomp_free_scratches(scomp_dst_scratches);
111 scomp_src_scratches = NULL;
112 scomp_dst_scratches = NULL;
113 }
114}
115
116static int crypto_scomp_alloc_all_scratches(void)
117{
118 if (!scomp_scratch_users++) {
119 scomp_src_scratches = crypto_scomp_alloc_scratches();
120 if (!scomp_src_scratches)
121 return -ENOMEM;
122 scomp_dst_scratches = crypto_scomp_alloc_scratches();
123 if (!scomp_dst_scratches) {
124 crypto_scomp_free_scratches(scomp_src_scratches);
125 scomp_src_scratches = NULL;
126 return -ENOMEM;
127 }
128 }
129 return 0;
130}
131
132static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
133{
134 int ret;
135
136 mutex_lock(&scomp_lock);
137 ret = crypto_scomp_alloc_all_scratches();
138 mutex_unlock(&scomp_lock);
139
140 return ret;
141}
142
143static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
144{
145 struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
146 void **tfm_ctx = acomp_tfm_ctx(tfm);
147 struct crypto_scomp *scomp = *tfm_ctx;
148 void **ctx = acomp_request_ctx(req);
149 const int cpu = get_cpu();
150 u8 *scratch_src = *per_cpu_ptr(scomp_src_scratches, cpu);
151 u8 *scratch_dst = *per_cpu_ptr(scomp_dst_scratches, cpu);
152 int ret;
153
154 if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE) {
155 ret = -EINVAL;
156 goto out;
157 }
158
159 if (req->dst && !req->dlen) {
160 ret = -EINVAL;
161 goto out;
162 }
163
164 if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
165 req->dlen = SCOMP_SCRATCH_SIZE;
166
167 scatterwalk_map_and_copy(scratch_src, req->src, 0, req->slen, 0);
168 if (dir)
169 ret = crypto_scomp_compress(scomp, scratch_src, req->slen,
170 scratch_dst, &req->dlen, *ctx);
171 else
172 ret = crypto_scomp_decompress(scomp, scratch_src, req->slen,
173 scratch_dst, &req->dlen, *ctx);
174 if (!ret) {
175 if (!req->dst) {
176 req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
177 if (!req->dst)
178 goto out;
179 }
180 scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen,
181 1);
182 }
183out:
184 put_cpu();
185 return ret;
186}
187
188static int scomp_acomp_compress(struct acomp_req *req)
189{
190 return scomp_acomp_comp_decomp(req, 1);
191}
192
193static int scomp_acomp_decompress(struct acomp_req *req)
194{
195 return scomp_acomp_comp_decomp(req, 0);
196}
197
198static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
199{
200 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
201
202 crypto_free_scomp(*ctx);
203
204 mutex_lock(&scomp_lock);
205 crypto_scomp_free_all_scratches();
206 mutex_unlock(&scomp_lock);
207}
208
209int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
210{
211 struct crypto_alg *calg = tfm->__crt_alg;
212 struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
213 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
214 struct crypto_scomp *scomp;
215
216 if (!crypto_mod_get(calg))
217 return -EAGAIN;
218
219 scomp = crypto_create_tfm(calg, &crypto_scomp_type);
220 if (IS_ERR(scomp)) {
221 crypto_mod_put(calg);
222 return PTR_ERR(scomp);
223 }
224
225 *ctx = scomp;
226 tfm->exit = crypto_exit_scomp_ops_async;
227
228 crt->compress = scomp_acomp_compress;
229 crt->decompress = scomp_acomp_decompress;
230 crt->dst_free = sgl_free;
231 crt->reqsize = sizeof(void *);
232
233 return 0;
234}
235
236struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
237{
238 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
239 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
240 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
241 struct crypto_scomp *scomp = *tfm_ctx;
242 void *ctx;
243
244 ctx = crypto_scomp_alloc_ctx(scomp);
245 if (IS_ERR(ctx)) {
246 kfree(req);
247 return NULL;
248 }
249
250 *req->__ctx = ctx;
251
252 return req;
253}
254
255void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
256{
257 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
258 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
259 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
260 struct crypto_scomp *scomp = *tfm_ctx;
261 void *ctx = *req->__ctx;
262
263 if (ctx)
264 crypto_scomp_free_ctx(scomp, ctx);
265}
266
267static const struct crypto_type crypto_scomp_type = {
268 .extsize = crypto_alg_extsize,
269 .init_tfm = crypto_scomp_init_tfm,
270#ifdef CONFIG_PROC_FS
271 .show = crypto_scomp_show,
272#endif
273 .report = crypto_scomp_report,
274 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
275 .maskset = CRYPTO_ALG_TYPE_MASK,
276 .type = CRYPTO_ALG_TYPE_SCOMPRESS,
277 .tfmsize = offsetof(struct crypto_scomp, base),
278};
279
280int crypto_register_scomp(struct scomp_alg *alg)
281{
282 struct crypto_alg *base = &alg->base;
283
284 base->cra_type = &crypto_scomp_type;
285 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
286 base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
287
288 return crypto_register_alg(base);
289}
290EXPORT_SYMBOL_GPL(crypto_register_scomp);
291
292int crypto_unregister_scomp(struct scomp_alg *alg)
293{
294 return crypto_unregister_alg(&alg->base);
295}
296EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
297
298int crypto_register_scomps(struct scomp_alg *algs, int count)
299{
300 int i, ret;
301
302 for (i = 0; i < count; i++) {
303 ret = crypto_register_scomp(&algs[i]);
304 if (ret)
305 goto err;
306 }
307
308 return 0;
309
310err:
311 for (--i; i >= 0; --i)
312 crypto_unregister_scomp(&algs[i]);
313
314 return ret;
315}
316EXPORT_SYMBOL_GPL(crypto_register_scomps);
317
318void crypto_unregister_scomps(struct scomp_alg *algs, int count)
319{
320 int i;
321
322 for (i = count - 1; i >= 0; --i)
323 crypto_unregister_scomp(&algs[i]);
324}
325EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
326
327MODULE_LICENSE("GPL");
328MODULE_DESCRIPTION("Synchronous compression type");
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(rscomp.type, "scomp", sizeof(rscomp.type));
48
49 return nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
50 sizeof(rscomp), &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, "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(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
84 scratch = per_cpu_ptr(&scomp_scratch, i);
85
86 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
87 if (!mem)
88 goto error;
89 scratch->src = mem;
90 mem = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(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(&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 void *src, *dst;
121 unsigned int dlen;
122 int ret;
123
124 if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
125 return -EINVAL;
126
127 if (req->dst && !req->dlen)
128 return -EINVAL;
129
130 if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
131 req->dlen = SCOMP_SCRATCH_SIZE;
132
133 dlen = req->dlen;
134
135 scratch = raw_cpu_ptr(&scomp_scratch);
136 spin_lock(&scratch->lock);
137
138 if (sg_nents(req->src) == 1 && !PageHighMem(sg_page(req->src))) {
139 src = page_to_virt(sg_page(req->src)) + req->src->offset;
140 } else {
141 scatterwalk_map_and_copy(scratch->src, req->src, 0,
142 req->slen, 0);
143 src = scratch->src;
144 }
145
146 if (req->dst && sg_nents(req->dst) == 1 && !PageHighMem(sg_page(req->dst)))
147 dst = page_to_virt(sg_page(req->dst)) + req->dst->offset;
148 else
149 dst = scratch->dst;
150
151 if (dir)
152 ret = crypto_scomp_compress(scomp, src, req->slen,
153 dst, &req->dlen, *ctx);
154 else
155 ret = crypto_scomp_decompress(scomp, src, req->slen,
156 dst, &req->dlen, *ctx);
157 if (!ret) {
158 if (!req->dst) {
159 req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
160 if (!req->dst) {
161 ret = -ENOMEM;
162 goto out;
163 }
164 } else if (req->dlen > dlen) {
165 ret = -ENOSPC;
166 goto out;
167 }
168 if (dst == scratch->dst) {
169 scatterwalk_map_and_copy(scratch->dst, req->dst, 0,
170 req->dlen, 1);
171 } else {
172 int nr_pages = DIV_ROUND_UP(req->dst->offset + req->dlen, PAGE_SIZE);
173 int i;
174 struct page *dst_page = sg_page(req->dst);
175
176 for (i = 0; i < nr_pages; i++)
177 flush_dcache_page(dst_page + i);
178 }
179 }
180out:
181 spin_unlock(&scratch->lock);
182 return ret;
183}
184
185static int scomp_acomp_compress(struct acomp_req *req)
186{
187 return scomp_acomp_comp_decomp(req, 1);
188}
189
190static int scomp_acomp_decompress(struct acomp_req *req)
191{
192 return scomp_acomp_comp_decomp(req, 0);
193}
194
195static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
196{
197 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
198
199 crypto_free_scomp(*ctx);
200
201 mutex_lock(&scomp_lock);
202 if (!--scomp_scratch_users)
203 crypto_scomp_free_scratches();
204 mutex_unlock(&scomp_lock);
205}
206
207int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
208{
209 struct crypto_alg *calg = tfm->__crt_alg;
210 struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
211 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
212 struct crypto_scomp *scomp;
213
214 if (!crypto_mod_get(calg))
215 return -EAGAIN;
216
217 scomp = crypto_create_tfm(calg, &crypto_scomp_type);
218 if (IS_ERR(scomp)) {
219 crypto_mod_put(calg);
220 return PTR_ERR(scomp);
221 }
222
223 *ctx = scomp;
224 tfm->exit = crypto_exit_scomp_ops_async;
225
226 crt->compress = scomp_acomp_compress;
227 crt->decompress = scomp_acomp_decompress;
228 crt->dst_free = sgl_free;
229 crt->reqsize = sizeof(void *);
230
231 return 0;
232}
233
234struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
235{
236 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
237 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
238 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
239 struct crypto_scomp *scomp = *tfm_ctx;
240 void *ctx;
241
242 ctx = crypto_scomp_alloc_ctx(scomp);
243 if (IS_ERR(ctx)) {
244 kfree(req);
245 return NULL;
246 }
247
248 *req->__ctx = ctx;
249
250 return req;
251}
252
253void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
254{
255 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
256 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
257 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
258 struct crypto_scomp *scomp = *tfm_ctx;
259 void *ctx = *req->__ctx;
260
261 if (ctx)
262 crypto_scomp_free_ctx(scomp, ctx);
263}
264
265static const struct crypto_type crypto_scomp_type = {
266 .extsize = crypto_alg_extsize,
267 .init_tfm = crypto_scomp_init_tfm,
268#ifdef CONFIG_PROC_FS
269 .show = crypto_scomp_show,
270#endif
271#if IS_ENABLED(CONFIG_CRYPTO_USER)
272 .report = crypto_scomp_report,
273#endif
274 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
275 .maskset = CRYPTO_ALG_TYPE_MASK,
276 .type = CRYPTO_ALG_TYPE_SCOMPRESS,
277 .tfmsize = offsetof(struct crypto_scomp, base),
278};
279
280int crypto_register_scomp(struct scomp_alg *alg)
281{
282 struct crypto_alg *base = &alg->calg.base;
283
284 comp_prepare_alg(&alg->calg);
285
286 base->cra_type = &crypto_scomp_type;
287 base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
288
289 return crypto_register_alg(base);
290}
291EXPORT_SYMBOL_GPL(crypto_register_scomp);
292
293void crypto_unregister_scomp(struct scomp_alg *alg)
294{
295 crypto_unregister_alg(&alg->base);
296}
297EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
298
299int crypto_register_scomps(struct scomp_alg *algs, int count)
300{
301 int i, ret;
302
303 for (i = 0; i < count; i++) {
304 ret = crypto_register_scomp(&algs[i]);
305 if (ret)
306 goto err;
307 }
308
309 return 0;
310
311err:
312 for (--i; i >= 0; --i)
313 crypto_unregister_scomp(&algs[i]);
314
315 return ret;
316}
317EXPORT_SYMBOL_GPL(crypto_register_scomps);
318
319void crypto_unregister_scomps(struct scomp_alg *algs, int count)
320{
321 int i;
322
323 for (i = count - 1; i >= 0; --i)
324 crypto_unregister_scomp(&algs[i]);
325}
326EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
327
328MODULE_LICENSE("GPL");
329MODULE_DESCRIPTION("Synchronous compression type");