[linux.git] / crypto / scompress.c

/*
 * Synchronous Compression operations
 *
 * Copyright 2015 LG Electronics Inc.
 * Copyright (c) 2016, Intel Corporation
 * Author: Giovanni Cabiddu <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 */
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <linux/vmalloc.h>
#include <crypto/algapi.h>
#include <linux/cryptouser.h>
#include <net/netlink.h>
#include <linux/scatterlist.h>
#include <crypto/scatterwalk.h>
#include <crypto/internal/acompress.h>
#include <crypto/internal/scompress.h>
#include "internal.h"

static const struct crypto_type crypto_scomp_type;
static void * __percpu *scomp_src_scratches;
static void * __percpu *scomp_dst_scratches;
static int scomp_scratch_users;
static DEFINE_MUTEX(scomp_lock);

#ifdef CONFIG_NET
static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	struct crypto_report_comp rscomp;

	strncpy(rscomp.type, "scomp", sizeof(rscomp.type));

	if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS,
		    sizeof(struct crypto_report_comp), &rscomp))
		goto nla_put_failure;
	return 0;

nla_put_failure:
	return -EMSGSIZE;
}
#else
static int crypto_scomp_report(struct sk_buff *skb, struct crypto_alg *alg)
{
	return -ENOSYS;
}
#endif

static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
	__attribute__ ((unused));

static void crypto_scomp_show(struct seq_file *m, struct crypto_alg *alg)
{
	seq_puts(m, "type         : scomp\n");
}

static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
{
	return 0;
}

static void crypto_scomp_free_scratches(void * __percpu *scratches)
{
	int i;

	if (!scratches)
		return;

	for_each_possible_cpu(i)
		vfree(*per_cpu_ptr(scratches, i));

	free_percpu(scratches);
}

static void * __percpu *crypto_scomp_alloc_scratches(void)
{
	void * __percpu *scratches;
	int i;

	scratches = alloc_percpu(void *);
	if (!scratches)
		return NULL;

	for_each_possible_cpu(i) {
		void *scratch;

		scratch = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
		if (!scratch)
			goto error;
		*per_cpu_ptr(scratches, i) = scratch;
	}

	return scratches;

error:
	crypto_scomp_free_scratches(scratches);
	return NULL;
}

static void crypto_scomp_free_all_scratches(void)
{
	if (!--scomp_scratch_users) {
		crypto_scomp_free_scratches(scomp_src_scratches);
		crypto_scomp_free_scratches(scomp_dst_scratches);
		scomp_src_scratches = NULL;
		scomp_dst_scratches = NULL;
	}
}

static int crypto_scomp_alloc_all_scratches(void)
{
	if (!scomp_scratch_users++) {
		scomp_src_scratches = crypto_scomp_alloc_scratches();
		if (!scomp_src_scratches)
			return -ENOMEM;
		scomp_dst_scratches = crypto_scomp_alloc_scratches();
		if (!scomp_dst_scratches)
			return -ENOMEM;
	}
	return 0;
}

static void crypto_scomp_sg_free(struct scatterlist *sgl)
{
	int i, n;
	struct page *page;

	if (!sgl)
		return;

	n = sg_nents(sgl);
	for_each_sg(sgl, sgl, n, i) {
		page = sg_page(sgl);
		if (page)
			__free_page(page);
	}

	kfree(sgl);
}

static struct scatterlist *crypto_scomp_sg_alloc(size_t size, gfp_t gfp)
{
	struct scatterlist *sgl;
	struct page *page;
	int i, n;

	n = ((size - 1) >> PAGE_SHIFT) + 1;

	sgl = kmalloc_array(n, sizeof(struct scatterlist), gfp);
	if (!sgl)
		return NULL;

	sg_init_table(sgl, n);

	for (i = 0; i < n; i++) {
		page = alloc_page(gfp);
		if (!page)
			goto err;
		sg_set_page(sgl + i, page, PAGE_SIZE, 0);
	}

	return sgl;

err:
	sg_mark_end(sgl + i);
	crypto_scomp_sg_free(sgl);
	return NULL;
}

static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
{
	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	void **tfm_ctx = acomp_tfm_ctx(tfm);
	struct crypto_scomp *scomp = *tfm_ctx;
	void **ctx = acomp_request_ctx(req);
	const int cpu = get_cpu();
	u8 *scratch_src = *per_cpu_ptr(scomp_src_scratches, cpu);
	u8 *scratch_dst = *per_cpu_ptr(scomp_dst_scratches, cpu);
	int ret;

	if (!req->src || !req->slen || req->slen > SCOMP_SCRATCH_SIZE) {
		ret = -EINVAL;
		goto out;
	}

	if (req->dst && !req->dlen) {
		ret = -EINVAL;
		goto out;
	}

	if (!req->dlen || req->dlen > SCOMP_SCRATCH_SIZE)
		req->dlen = SCOMP_SCRATCH_SIZE;

	scatterwalk_map_and_copy(scratch_src, req->src, 0, req->slen, 0);
	if (dir)
		ret = crypto_scomp_compress(scomp, scratch_src, req->slen,
					    scratch_dst, &req->dlen, *ctx);
	else
		ret = crypto_scomp_decompress(scomp, scratch_src, req->slen,
					      scratch_dst, &req->dlen, *ctx);
	if (!ret) {
		if (!req->dst) {
			req->dst = crypto_scomp_sg_alloc(req->dlen,
				   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP ?
				   GFP_KERNEL : GFP_ATOMIC);
			if (!req->dst)
				goto out;
		}
		scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen,
					 1);
	}
out:
	put_cpu();
	return ret;
}

static int scomp_acomp_compress(struct acomp_req *req)
{
	return scomp_acomp_comp_decomp(req, 1);
}

static int scomp_acomp_decompress(struct acomp_req *req)
{
	return scomp_acomp_comp_decomp(req, 0);
}

static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);

	crypto_free_scomp(*ctx);
}

int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
{
	struct crypto_alg *calg = tfm->__crt_alg;
	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp;

	if (!crypto_mod_get(calg))
		return -EAGAIN;

	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
	if (IS_ERR(scomp)) {
		crypto_mod_put(calg);
		return PTR_ERR(scomp);
	}

	*ctx = scomp;
	tfm->exit = crypto_exit_scomp_ops_async;

	crt->compress = scomp_acomp_compress;
	crt->decompress = scomp_acomp_decompress;
	crt->dst_free = crypto_scomp_sg_free;
	crt->reqsize = sizeof(void *);

	return 0;
}

struct acomp_req *crypto_acomp_scomp_alloc_ctx(struct acomp_req *req)
{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp = *tfm_ctx;
	void *ctx;

	ctx = crypto_scomp_alloc_ctx(scomp);
	if (IS_ERR(ctx)) {
		kfree(req);
		return NULL;
	}

	*req->__ctx = ctx;

	return req;
}

void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
{
	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	struct crypto_scomp *scomp = *tfm_ctx;
	void *ctx = *req->__ctx;

	if (ctx)
		crypto_scomp_free_ctx(scomp, ctx);
}

static const struct crypto_type crypto_scomp_type = {
	.extsize = crypto_alg_extsize,
	.init_tfm = crypto_scomp_init_tfm,
#ifdef CONFIG_PROC_FS
	.show = crypto_scomp_show,
#endif
	.report = crypto_scomp_report,
	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	.maskset = CRYPTO_ALG_TYPE_MASK,
	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
	.tfmsize = offsetof(struct crypto_scomp, base),
};

int crypto_register_scomp(struct scomp_alg *alg)
{
	struct crypto_alg *base = &alg->base;
	int ret = -ENOMEM;

	mutex_lock(&scomp_lock);
	if (crypto_scomp_alloc_all_scratches())
		goto error;

	base->cra_type = &crypto_scomp_type;
	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	base->cra_flags |= CRYPTO_ALG_TYPE_SCOMPRESS;

	ret = crypto_register_alg(base);
	if (ret)
		goto error;

	mutex_unlock(&scomp_lock);
	return ret;

error:
	crypto_scomp_free_all_scratches();
	mutex_unlock(&scomp_lock);
	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_scomp);

int crypto_unregister_scomp(struct scomp_alg *alg)
{
	int ret;

	mutex_lock(&scomp_lock);
	ret = crypto_unregister_alg(&alg->base);
	crypto_scomp_free_all_scratches();
	mutex_unlock(&scomp_lock);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_unregister_scomp);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Synchronous compression type");
Commit	Line	Data
1ab53a77 GC	1	/*
	2	* Synchronous Compression operations
	3	*
	4	* Copyright 2015 LG Electronics Inc.
	5	* Copyright (c) 2016, Intel Corporation
	6	* Author: Giovanni Cabiddu <[email protected]>
	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");