Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/crypto/scompress.c

  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/vmalloc.h>
 22 #include <crypto/algapi.h>
 23 #include <linux/cryptouser.h>
 24 #include <net/netlink.h>
 25 #include <linux/scatterlist.h>
 26 #include <crypto/scatterwalk.h>
 27 #include <crypto/internal/acompress.h>
 28 #include <crypto/internal/scompress.h>
 29 #include "internal.h"
 30 
 31 static const struct crypto_type crypto_scomp_type;
 32 static void * __percpu *scomp_src_scratches;
 33 static void * __percpu *scomp_dst_scratches;
 34 static int scomp_scratch_users;
 35 static DEFINE_MUTEX(scomp_lock);
 36 
 37 #ifdef CONFIG_NET
 38 static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 39 {
 40         struct crypto_report_comp rscomp;
 41 
 42         strncpy(rscomp.type, "scomp", sizeof(rscomp.type));
 43 
 44         if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
 45                     sizeof(struct crypto_report_comp), &rscomp))
 46                 goto nla_put_failure;
 47         return 0;
 48 
 49 nla_put_failure:
 50         return -EMSGSIZE;
 51 }
 52 #else
 53 static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 54 {
 55         return -ENOSYS;
 56 }
 57 #endif
 58 
 59 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
 60         __attribute__ ((unused));
 61 
 62 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
 63 {
 64         seq_puts(m, "type         : scomp\n");
 65 }
 66 
 67 static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
 68 {
 69         return 0;
 70 }
 71 
 72 static void crypto_scomp_free_scratches(void * __percpu *scratches)
 73 {
 74         int i;
 75 
 76         if (!scratches)
 77                 return;
 78 
 79         for_each_possible_cpu(i)
 80                 vfree(*per_cpu_ptr(scratches, i));
 81 
 82         free_percpu(scratches);
 83 }
 84 
 85 static void * __percpu *crypto_scomp_alloc_scratches(void)
 86 {
 87         void * __percpu *scratches;
 88         int i;
 89 
 90         scratches = alloc_percpu(void *);
 91         if (!scratches)
 92                 return NULL;
 93 
 94         for_each_possible_cpu(i) {
 95                 void *scratch;
 96 
 97                 scratch = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
 98                 if (!scratch)
 99                         goto error;
100                 *per_cpu_ptr(scratches, i) = scratch;
101         }
102 
103         return scratches;
104 
105 error:
106         crypto_scomp_free_scratches(scratches);
107         return NULL;
108 }
109 
110 static void crypto_scomp_free_all_scratches(void)
111 {
112         if (!--scomp_scratch_users) {
113                 crypto_scomp_free_scratches(scomp_src_scratches);
114                 crypto_scomp_free_scratches(scomp_dst_scratches);
115                 scomp_src_scratches = NULL;
116                 scomp_dst_scratches = NULL;
117         }
118 }
119 
120 static int crypto_scomp_alloc_all_scratches(void)
121 {
122         if (!scomp_scratch_users++) {
123                 scomp_src_scratches = crypto_scomp_alloc_scratches();
124                 if (!scomp_src_scratches)
125                         return -ENOMEM;
126                 scomp_dst_scratches = crypto_scomp_alloc_scratches();
127                 if (!scomp_dst_scratches)
128                         return -ENOMEM;
129         }
130         return 0;
131 }
132 
133 static void crypto_scomp_sg_free(struct scatterlist *sgl)
134 {
135         int i, n;
136         struct page *page;
137 
138         if (!sgl)
139                 return;
140 
141         n = sg_nents(sgl);
142         for_each_sg(sgl, sgl, n, i) {
143                 page = sg_page(sgl);
144                 if (page)
145                         __free_page(page);
146         }
147 
148         kfree(sgl);
149 }
150 
151 static struct scatterlist *crypto_scomp_sg_alloc(size_t size, gfp_t gfp)
152 {
153         struct scatterlist *sgl;
154         struct page *page;
155         int i, n;
156 
157         n = ((size - 1) >> PAGE_SHIFT) + 1;
158 
159         sgl = kmalloc_array(n, sizeof(struct scatterlist), gfp);
160         if (!sgl)
161                 return NULL;
162 
163         sg_init_table(sgl, n);
164 
165         for (i = 0; i < n; i++) {
166                 page = alloc_page(gfp);
167                 if (!page)
168                         goto err;
169                 sg_set_page(sgl + i, page, PAGE_SIZE, 0);
170         }
171 
172         return sgl;
173 
174 err:
175         sg_mark_end(sgl + i);
176         crypto_scomp_sg_free(sgl);
177         return NULL;
178 }
179 
180 static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
181 {
182         struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
183         void **tfm_ctx = acomp_tfm_ctx(tfm);
184         struct crypto_scomp *scomp = *tfm_ctx;
185         void **ctx = acomp_request_ctx(req);
186         const int cpu = get_cpu();
187         u8 *scratch_src = *per_cpu_ptr(scomp_src_scratches, cpu);
188         u8 *scratch_dst = *per_cpu_ptr(scomp_dst_scratches, cpu);
189         int ret;
190 
191         if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE) {
192                 ret = -EINVAL;
193                 goto out;
194         }
195 
196         if (req->dst && !req->dlen) {
197                 ret = -EINVAL;
198                 goto out;
199         }
200 
201         if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
202                 req->dlen = SCOMP_SCRATCH_SIZE;
203 
204         scatterwalk_map_and_copy(scratch_src, req->src, 0, req->slen, 0);
205         if (dir)
206                 ret = crypto_scomp_compress(scomp, scratch_src, req->slen,
207                                             scratch_dst, &req->dlen, *ctx);
208         else
209                 ret = crypto_scomp_decompress(scomp, scratch_src, req->slen,
210                                               scratch_dst, &req->dlen, *ctx);
211         if (!ret) {
212                 if (!req->dst) {
213                         req->dst = crypto_scomp_sg_alloc(req->dlen,
214                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
215                                    GFP_KERNEL : GFP_ATOMIC);
216                         if (!req->dst)
217                                 goto out;
218                 }
219                 scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen,
220                                          1);
221         }
222 out:
223         put_cpu();
224         return ret;
225 }
226 
227 static int scomp_acomp_compress(struct acomp_req *req)
228 {
229         return scomp_acomp_comp_decomp(req, 1);
230 }
231 
232 static int scomp_acomp_decompress(struct acomp_req *req)
233 {
234         return scomp_acomp_comp_decomp(req, 0);
235 }
236 
237 static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
238 {
239         struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
240 
241         crypto_free_scomp(*ctx);
242 }
243 
244 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
245 {
246         struct crypto_alg *calg = tfm->__crt_alg;
247         struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
248         struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
249         struct crypto_scomp *scomp;
250 
251         if (!crypto_mod_get(calg))
252                 return -EAGAIN;
253 
254         scomp = crypto_create_tfm(calg, &crypto_scomp_type);
255         if (IS_ERR(scomp)) {
256                 crypto_mod_put(calg);
257                 return PTR_ERR(scomp);
258         }
259 
260         *ctx = scomp;
261         tfm->exit = crypto_exit_scomp_ops_async;
262 
263         crt->compress = scomp_acomp_compress;
264         crt->decompress = scomp_acomp_decompress;
265         crt->dst_free = crypto_scomp_sg_free;
266         crt->reqsize = sizeof(void *);
267 
268         return 0;
269 }
270 
271 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
272 {
273         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
274         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
275         struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
276         struct crypto_scomp *scomp = *tfm_ctx;
277         void *ctx;
278 
279         ctx = crypto_scomp_alloc_ctx(scomp);
280         if (IS_ERR(ctx)) {
281                 kfree(req);
282                 return NULL;
283         }
284 
285         *req->__ctx = ctx;
286 
287         return req;
288 }
289 
290 void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
291 {
292         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
293         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
294         struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
295         struct crypto_scomp *scomp = *tfm_ctx;
296         void *ctx = *req->__ctx;
297 
298         if (ctx)
299                 crypto_scomp_free_ctx(scomp, ctx);
300 }
301 
302 static const struct crypto_type crypto_scomp_type = {
303         .extsize = crypto_alg_extsize,
304         .init_tfm = crypto_scomp_init_tfm,
305 #ifdef CONFIG_PROC_FS
306         .show = crypto_scomp_show,
307 #endif
308         .report = crypto_scomp_report,
309         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
310         .maskset = CRYPTO_ALG_TYPE_MASK,
311         .type = CRYPTO_ALG_TYPE_SCOMPRESS,
312         .tfmsize = offsetof(struct crypto_scomp, base),
313 };
314 
315 int crypto_register_scomp(struct scomp_alg *alg)
316 {
317         struct crypto_alg *base = &alg->base;
318         int ret = -ENOMEM;
319 
320         mutex_lock(&scomp_lock);
321         if (crypto_scomp_alloc_all_scratches())
322                 goto error;
323 
324         base->cra_type = &crypto_scomp_type;
325         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
326         base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
327 
328         ret = crypto_register_alg(base);
329         if (ret)
330                 goto error;
331 
332         mutex_unlock(&scomp_lock);
333         return ret;
334 
335 error:
336         crypto_scomp_free_all_scratches();
337         mutex_unlock(&scomp_lock);
338         return ret;
339 }
340 EXPORT_SYMBOL_GPL(crypto_register_scomp);
341 
342 int crypto_unregister_scomp(struct scomp_alg *alg)
343 {
344         int ret;
345 
346         mutex_lock(&scomp_lock);
347         ret = crypto_unregister_alg(&alg->base);
348         crypto_scomp_free_all_scratches();
349         mutex_unlock(&scomp_lock);
350 
351         return ret;
352 }
353 EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
354 
355 MODULE_LICENSE("GPL");
356 MODULE_DESCRIPTION("Synchronous compression type");
357 

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