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TOMOYO Linux Cross Reference
Linux/crypto/scompress.c

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  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 
 32 static const struct crypto_type crypto_scomp_type;
 33 static void * __percpu *scomp_src_scratches;
 34 static void * __percpu *scomp_dst_scratches;
 35 static int scomp_scratch_users;
 36 static DEFINE_MUTEX(scomp_lock);
 37 
 38 #ifdef CONFIG_NET
 39 static 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 
 50 nla_put_failure:
 51         return -EMSGSIZE;
 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 static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
 64 {
 65         seq_puts(m, "type         : scomp\n");
 66 }
 67 
 68 static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
 69 {
 70         return 0;
 71 }
 72 
 73 static void crypto_scomp_free_scratches(void * __percpu *scratches)
 74 {
 75         int i;
 76 
 77         if (!scratches)
 78                 return;
 79 
 80         for_each_possible_cpu(i)
 81                 vfree(*per_cpu_ptr(scratches, i));
 82 
 83         free_percpu(scratches);
 84 }
 85 
 86 static void * __percpu *crypto_scomp_alloc_scratches(void)
 87 {
 88         void * __percpu *scratches;
 89         int i;
 90 
 91         scratches = alloc_percpu(void *);
 92         if (!scratches)
 93                 return NULL;
 94 
 95         for_each_possible_cpu(i) {
 96                 void *scratch;
 97 
 98                 scratch = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
 99                 if (!scratch)
100                         goto error;
101                 *per_cpu_ptr(scratches, i) = scratch;
102         }
103 
104         return scratches;
105 
106 error:
107         crypto_scomp_free_scratches(scratches);
108         return NULL;
109 }
110 
111 static void crypto_scomp_free_all_scratches(void)
112 {
113         if (!--scomp_scratch_users) {
114                 crypto_scomp_free_scratches(scomp_src_scratches);
115                 crypto_scomp_free_scratches(scomp_dst_scratches);
116                 scomp_src_scratches = NULL;
117                 scomp_dst_scratches = NULL;
118         }
119 }
120 
121 static int crypto_scomp_alloc_all_scratches(void)
122 {
123         if (!scomp_scratch_users++) {
124                 scomp_src_scratches = crypto_scomp_alloc_scratches();
125                 if (!scomp_src_scratches)
126                         return -ENOMEM;
127                 scomp_dst_scratches = crypto_scomp_alloc_scratches();
128                 if (!scomp_dst_scratches)
129                         return -ENOMEM;
130         }
131         return 0;
132 }
133 
134 static void crypto_scomp_sg_free(struct scatterlist *sgl)
135 {
136         int i, n;
137         struct page *page;
138 
139         if (!sgl)
140                 return;
141 
142         n = sg_nents(sgl);
143         for_each_sg(sgl, sgl, n, i) {
144                 page = sg_page(sgl);
145                 if (page)
146                         __free_page(page);
147         }
148 
149         kfree(sgl);
150 }
151 
152 static struct scatterlist *crypto_scomp_sg_alloc(size_t size, gfp_t gfp)
153 {
154         struct scatterlist *sgl;
155         struct page *page;
156         int i, n;
157 
158         n = ((size - 1) >> PAGE_SHIFT) + 1;
159 
160         sgl = kmalloc_array(n, sizeof(struct scatterlist), gfp);
161         if (!sgl)
162                 return NULL;
163 
164         sg_init_table(sgl, n);
165 
166         for (i = 0; i < n; i++) {
167                 page = alloc_page(gfp);
168                 if (!page)
169                         goto err;
170                 sg_set_page(sgl + i, page, PAGE_SIZE, 0);
171         }
172 
173         return sgl;
174 
175 err:
176         sg_mark_end(sgl + i);
177         crypto_scomp_sg_free(sgl);
178         return NULL;
179 }
180 
181 static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
182 {
183         struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
184         void **tfm_ctx = acomp_tfm_ctx(tfm);
185         struct crypto_scomp *scomp = *tfm_ctx;
186         void **ctx = acomp_request_ctx(req);
187         const int cpu = get_cpu();
188         u8 *scratch_src = *per_cpu_ptr(scomp_src_scratches, cpu);
189         u8 *scratch_dst = *per_cpu_ptr(scomp_dst_scratches, cpu);
190         int ret;
191 
192         if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE) {
193                 ret = -EINVAL;
194                 goto out;
195         }
196 
197         if (req->dst && !req->dlen) {
198                 ret = -EINVAL;
199                 goto out;
200         }
201 
202         if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
203                 req->dlen = SCOMP_SCRATCH_SIZE;
204 
205         scatterwalk_map_and_copy(scratch_src, req->src, 0, req->slen, 0);
206         if (dir)
207                 ret = crypto_scomp_compress(scomp, scratch_src, req->slen,
208                                             scratch_dst, &req->dlen, *ctx);
209         else
210                 ret = crypto_scomp_decompress(scomp, scratch_src, req->slen,
211                                               scratch_dst, &req->dlen, *ctx);
212         if (!ret) {
213                 if (!req->dst) {
214                         req->dst = crypto_scomp_sg_alloc(req->dlen,
215                                    req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
216                                    GFP_KERNEL : GFP_ATOMIC);
217                         if (!req->dst)
218                                 goto out;
219                 }
220                 scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen,
221                                          1);
222         }
223 out:
224         put_cpu();
225         return ret;
226 }
227 
228 static int scomp_acomp_compress(struct acomp_req *req)
229 {
230         return scomp_acomp_comp_decomp(req, 1);
231 }
232 
233 static int scomp_acomp_decompress(struct acomp_req *req)
234 {
235         return scomp_acomp_comp_decomp(req, 0);
236 }
237 
238 static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
239 {
240         struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
241 
242         crypto_free_scomp(*ctx);
243 }
244 
245 int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
246 {
247         struct crypto_alg *calg = tfm->__crt_alg;
248         struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
249         struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
250         struct crypto_scomp *scomp;
251 
252         if (!crypto_mod_get(calg))
253                 return -EAGAIN;
254 
255         scomp = crypto_create_tfm(calg, &crypto_scomp_type);
256         if (IS_ERR(scomp)) {
257                 crypto_mod_put(calg);
258                 return PTR_ERR(scomp);
259         }
260 
261         *ctx = scomp;
262         tfm->exit = crypto_exit_scomp_ops_async;
263 
264         crt->compress = scomp_acomp_compress;
265         crt->decompress = scomp_acomp_decompress;
266         crt->dst_free = crypto_scomp_sg_free;
267         crt->reqsize = sizeof(void *);
268 
269         return 0;
270 }
271 
272 struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
273 {
274         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
275         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
276         struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
277         struct crypto_scomp *scomp = *tfm_ctx;
278         void *ctx;
279 
280         ctx = crypto_scomp_alloc_ctx(scomp);
281         if (IS_ERR(ctx)) {
282                 kfree(req);
283                 return NULL;
284         }
285 
286         *req->__ctx = ctx;
287 
288         return req;
289 }
290 
291 void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
292 {
293         struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
294         struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
295         struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
296         struct crypto_scomp *scomp = *tfm_ctx;
297         void *ctx = *req->__ctx;
298 
299         if (ctx)
300                 crypto_scomp_free_ctx(scomp, ctx);
301 }
302 
303 static const struct crypto_type crypto_scomp_type = {
304         .extsize = crypto_alg_extsize,
305         .init_tfm = crypto_scomp_init_tfm,
306 #ifdef CONFIG_PROC_FS
307         .show = crypto_scomp_show,
308 #endif
309         .report = crypto_scomp_report,
310         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
311         .maskset = CRYPTO_ALG_TYPE_MASK,
312         .type = CRYPTO_ALG_TYPE_SCOMPRESS,
313         .tfmsize = offsetof(struct crypto_scomp, base),
314 };
315 
316 int crypto_register_scomp(struct scomp_alg *alg)
317 {
318         struct crypto_alg *base = &alg->base;
319         int ret = -ENOMEM;
320 
321         mutex_lock(&scomp_lock);
322         if (crypto_scomp_alloc_all_scratches())
323                 goto error;
324 
325         base->cra_type = &crypto_scomp_type;
326         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
327         base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;
328 
329         ret = crypto_register_alg(base);
330         if (ret)
331                 goto error;
332 
333         mutex_unlock(&scomp_lock);
334         return ret;
335 
336 error:
337         crypto_scomp_free_all_scratches();
338         mutex_unlock(&scomp_lock);
339         return ret;
340 }
341 EXPORT_SYMBOL_GPL(crypto_register_scomp);
342 
343 int crypto_unregister_scomp(struct scomp_alg *alg)
344 {
345         int ret;
346 
347         mutex_lock(&scomp_lock);
348         ret = crypto_unregister_alg(&alg->base);
349         crypto_scomp_free_all_scratches();
350         mutex_unlock(&scomp_lock);
351 
352         return ret;
353 }
354 EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
355 
356 MODULE_LICENSE("GPL");
357 MODULE_DESCRIPTION("Synchronous compression type");
358 

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