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
26 struct scomp_scratch {
27 spinlock_t lock;
28 void *src;
29 void *dst;
30 };
31
32 static DEFINE_PER_CPU(struct scomp_scratch, scomp_scratch) = {
33 .lock = __SPIN_LOCK_UNLOCKED(scomp_scratch.lock),
34 };
35
36 static const struct crypto_type crypto_scomp_type;
37 static int scomp_scratch_users;
38 static DEFINE_MUTEX(scomp_lock);
39
crypto_scomp_report(struct sk_buff * skb,struct crypto_alg * alg)40 static 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
53 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
54 __maybe_unused;
55
crypto_scomp_show(struct seq_file * m,struct crypto_alg * alg)56 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
57 {
58 seq_puts(m, "type : scomp\n");
59 }
60
crypto_scomp_free_scratches(void)61 static 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
crypto_scomp_alloc_scratches(void)76 static 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;
96 error:
97 crypto_scomp_free_scratches();
98 return -ENOMEM;
99 }
100
crypto_scomp_init_tfm(struct crypto_tfm * tfm)101 static 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
scomp_acomp_comp_decomp(struct acomp_req * req,int dir)113 static 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 unsigned int dlen;
121 int ret;
122
123 if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE)
124 return -EINVAL;
125
126 if (req->dst && !req->dlen)
127 return -EINVAL;
128
129 if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
130 req->dlen = SCOMP_SCRATCH_SIZE;
131
132 dlen = req->dlen;
133
134 scratch = raw_cpu_ptr(&scomp_scratch);
135 spin_lock(&scratch->lock);
136
137 scatterwalk_map_and_copy(scratch->src, req->src, 0, req->slen, 0);
138 if (dir)
139 ret = crypto_scomp_compress(scomp, scratch->src, req->slen,
140 scratch->dst, &req->dlen, *ctx);
141 else
142 ret = crypto_scomp_decompress(scomp, scratch->src, req->slen,
143 scratch->dst, &req->dlen, *ctx);
144 if (!ret) {
145 if (!req->dst) {
146 req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
147 if (!req->dst) {
148 ret = -ENOMEM;
149 goto out;
150 }
151 } else if (req->dlen > dlen) {
152 ret = -ENOSPC;
153 goto out;
154 }
155 scatterwalk_map_and_copy(scratch->dst, req->dst, 0, req->dlen,
156 1);
157 }
158 out:
159 spin_unlock(&scratch->lock);
160 return ret;
161 }
162
scomp_acomp_compress(struct acomp_req * req)163 static int scomp_acomp_compress(struct acomp_req *req)
164 {
165 return scomp_acomp_comp_decomp(req, 1);
166 }
167
scomp_acomp_decompress(struct acomp_req * req)168 static int scomp_acomp_decompress(struct acomp_req *req)
169 {
170 return scomp_acomp_comp_decomp(req, 0);
171 }
172
crypto_exit_scomp_ops_async(struct crypto_tfm * tfm)173 static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
174 {
175 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
176
177 crypto_free_scomp(*ctx);
178
179 mutex_lock(&scomp_lock);
180 if (!--scomp_scratch_users)
181 crypto_scomp_free_scratches();
182 mutex_unlock(&scomp_lock);
183 }
184
crypto_init_scomp_ops_async(struct crypto_tfm * tfm)185 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
186 {
187 struct crypto_alg *calg = tfm->__crt_alg;
188 struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
189 struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
190 struct crypto_scomp *scomp;
191
192 if (!crypto_mod_get(calg))
193 return -EAGAIN;
194
195 scomp = crypto_create_tfm(calg, &crypto_scomp_type);
196 if (IS_ERR(scomp)) {
197 crypto_mod_put(calg);
198 return PTR_ERR(scomp);
199 }
200
201 *ctx = scomp;
202 tfm->exit = crypto_exit_scomp_ops_async;
203
204 crt->compress = scomp_acomp_compress;
205 crt->decompress = scomp_acomp_decompress;
206 crt->dst_free = sgl_free;
207 crt->reqsize = sizeof(void *);
208
209 return 0;
210 }
211
crypto_acomp_scomp_alloc_ctx(struct acomp_req * req)212 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
213 {
214 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
215 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
216 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
217 struct crypto_scomp *scomp = *tfm_ctx;
218 void *ctx;
219
220 ctx = crypto_scomp_alloc_ctx(scomp);
221 if (IS_ERR(ctx)) {
222 kfree(req);
223 return NULL;
224 }
225
226 *req->__ctx = ctx;
227
228 return req;
229 }
230
crypto_acomp_scomp_free_ctx(struct acomp_req * req)231 void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
232 {
233 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
234 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
235 struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
236 struct crypto_scomp *scomp = *tfm_ctx;
237 void *ctx = *req->__ctx;
238
239 if (ctx)
240 crypto_scomp_free_ctx(scomp, ctx);
241 }
242
243 static const struct crypto_type crypto_scomp_type = {
244 .extsize = crypto_alg_extsize,
245 .init_tfm = crypto_scomp_init_tfm,
246 #ifdef CONFIG_PROC_FS
247 .show = crypto_scomp_show,
248 #endif
249 #if IS_ENABLED(CONFIG_CRYPTO_USER)
250 .report = crypto_scomp_report,
251 #endif
252 #ifdef CONFIG_CRYPTO_STATS
253 .report_stat = crypto_acomp_report_stat,
254 #endif
255 .maskclear = ~CRYPTO_ALG_TYPE_MASK,
256 .maskset = CRYPTO_ALG_TYPE_MASK,
257 .type = CRYPTO_ALG_TYPE_SCOMPRESS,
258 .tfmsize = offsetof(struct crypto_scomp, base),
259 };
260
crypto_register_scomp(struct scomp_alg * alg)261 int crypto_register_scomp(struct scomp_alg *alg)
262 {
263 struct crypto_alg *base = &alg->calg.base;
264
265 comp_prepare_alg(&alg->calg);
266
267 base->cra_type = &crypto_scomp_type;
268 base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
269
270 return crypto_register_alg(base);
271 }
272 EXPORT_SYMBOL_GPL(crypto_register_scomp);
273
crypto_unregister_scomp(struct scomp_alg * alg)274 void crypto_unregister_scomp(struct scomp_alg *alg)
275 {
276 crypto_unregister_alg(&alg->base);
277 }
278 EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
279
crypto_register_scomps(struct scomp_alg * algs,int count)280 int crypto_register_scomps(struct scomp_alg *algs, int count)
281 {
282 int i, ret;
283
284 for (i = 0; i < count; i++) {
285 ret = crypto_register_scomp(&algs[i]);
286 if (ret)
287 goto err;
288 }
289
290 return 0;
291
292 err:
293 for (--i; i >= 0; --i)
294 crypto_unregister_scomp(&algs[i]);
295
296 return ret;
297 }
298 EXPORT_SYMBOL_GPL(crypto_register_scomps);
299
crypto_unregister_scomps(struct scomp_alg * algs,int count)300 void crypto_unregister_scomps(struct scomp_alg *algs, int count)
301 {
302 int i;
303
304 for (i = count - 1; i >= 0; --i)
305 crypto_unregister_scomp(&algs[i]);
306 }
307 EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
308
309 MODULE_LICENSE("GPL");
310 MODULE_DESCRIPTION("Synchronous compression type");
311