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