[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/compiler.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)
	__maybe_unused;

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

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) {
			crypto_scomp_free_scratches(scomp_src_scratches);
			scomp_src_scratches = NULL;
			return -ENOMEM;
		}
	}
	return 0;
}

static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
{
	int ret;

	mutex_lock(&scomp_lock);
	ret = crypto_scomp_alloc_all_scratches();
	mutex_unlock(&scomp_lock);

	return ret;
}

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 = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
			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);

	mutex_lock(&scomp_lock);
	crypto_scomp_free_all_scratches();
	mutex_unlock(&scomp_lock);
}

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 = sgl_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;

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

	return crypto_register_alg(base);
}
EXPORT_SYMBOL_GPL(crypto_register_scomp);

int crypto_unregister_scomp(struct scomp_alg *alg)
{
	return crypto_unregister_alg(&alg->base);
}
EXPORT_SYMBOL_GPL(crypto_unregister_scomp);

int crypto_register_scomps(struct scomp_alg *algs, int count)
{
	int i, ret;

	for (i = 0; i < count; i++) {
		ret = crypto_register_scomp(&algs[i]);
		if (ret)
			goto err;
	}

	return 0;

err:
	for (--i; i >= 0; --i)
		crypto_unregister_scomp(&algs[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(crypto_register_scomps);

void crypto_unregister_scomps(struct scomp_alg *algs, int count)
{
	int i;

	for (i = count - 1; i >= 0; --i)
		crypto_unregister_scomp(&algs[i]);
}
EXPORT_SYMBOL_GPL(crypto_unregister_scomps);

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>
d8c34b94	21	#include <linux/compiler.h>
1ab53a77 GC	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)
d8c34b94	61	__maybe_unused;
1ab53a77 GC	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
1ab53a77 GC	68	static void crypto_scomp_free_scratches(void * __percpu *scratches)
	69	{
	70	int i;
	71
	72	if (!scratches)
	73	return;
	74
	75	for_each_possible_cpu(i)
	76	vfree(*per_cpu_ptr(scratches, i));
	77
	78	free_percpu(scratches);
	79	}
	80
	81	static void * __percpu *crypto_scomp_alloc_scratches(void)
	82	{
	83	void * __percpu *scratches;
	84	int i;
	85
	86	scratches = alloc_percpu(void *);
	87	if (!scratches)
	88	return NULL;
	89
	90	for_each_possible_cpu(i) {
	91	void *scratch;
	92
	93	scratch = vmalloc_node(SCOMP_SCRATCH_SIZE, cpu_to_node(i));
	94	if (!scratch)
	95	goto error;
	96	*per_cpu_ptr(scratches, i) = scratch;
	97	}
	98
	99	return scratches;
	100
	101	error:
	102	crypto_scomp_free_scratches(scratches);
	103	return NULL;
	104	}
	105
	106	static void crypto_scomp_free_all_scratches(void)
	107	{
	108	if (!--scomp_scratch_users) {
	109	crypto_scomp_free_scratches(scomp_src_scratches);
	110	crypto_scomp_free_scratches(scomp_dst_scratches);
	111	scomp_src_scratches = NULL;
	112	scomp_dst_scratches = NULL;
	113	}
	114	}
	115
	116	static int crypto_scomp_alloc_all_scratches(void)
	117	{
	118	if (!scomp_scratch_users++) {
	119	scomp_src_scratches = crypto_scomp_alloc_scratches();
	120	if (!scomp_src_scratches)
	121	return -ENOMEM;
	122	scomp_dst_scratches = crypto_scomp_alloc_scratches();
cc4d110e AB	123	if (!scomp_dst_scratches) {
	124	crypto_scomp_free_scratches(scomp_src_scratches);
	125	scomp_src_scratches = NULL;
1ab53a77	126	return -ENOMEM;
cc4d110e	127	}
1ab53a77 GC	128	}
	129	return 0;
	130	}
	131
6a8487a1 AB	132	static int crypto_scomp_init_tfm(struct crypto_tfm *tfm)
	133	{
	134	int ret;
	135
	136	mutex_lock(&scomp_lock);
	137	ret = crypto_scomp_alloc_all_scratches();
	138	mutex_unlock(&scomp_lock);
	139
	140	return ret;
	141	}
	142
1ab53a77 GC	143	static int scomp_acomp_comp_decomp(struct acomp_req *req, int dir)
	144	{
	145	struct crypto_acomp *tfm = crypto_acomp_reqtfm(req);
	146	void **tfm_ctx = acomp_tfm_ctx(tfm);
	147	struct crypto_scomp scomp = tfm_ctx;
	148	void **ctx = acomp_request_ctx(req);
	149	const int cpu = get_cpu();
	150	u8 scratch_src = per_cpu_ptr(scomp_src_scratches, cpu);
	151	u8 scratch_dst = per_cpu_ptr(scomp_dst_scratches, cpu);
	152	int ret;
	153
	154	if (!req->src \|\| !req->slen \|\| req->slen > SCOMP_SCRATCH_SIZE) {
	155	ret = -EINVAL;
	156	goto out;
	157	}
	158
	159	if (req->dst && !req->dlen) {
	160	ret = -EINVAL;
	161	goto out;
	162	}
	163
	164	if (!req->dlen \|\| req->dlen > SCOMP_SCRATCH_SIZE)
	165	req->dlen = SCOMP_SCRATCH_SIZE;
	166
	167	scatterwalk_map_and_copy(scratch_src, req->src, 0, req->slen, 0);
	168	if (dir)
	169	ret = crypto_scomp_compress(scomp, scratch_src, req->slen,
	170	scratch_dst, &req->dlen, *ctx);
	171	else
	172	ret = crypto_scomp_decompress(scomp, scratch_src, req->slen,
	173	scratch_dst, &req->dlen, *ctx);
	174	if (!ret) {
	175	if (!req->dst) {
8cd579d2	176	req->dst = sgl_alloc(req->dlen, GFP_ATOMIC, NULL);
1ab53a77 GC	177	if (!req->dst)
	178	goto out;
	179	}
	180	scatterwalk_map_and_copy(scratch_dst, req->dst, 0, req->dlen,
	181	1);
	182	}
	183	out:
	184	put_cpu();
	185	return ret;
	186	}
	187
	188	static int scomp_acomp_compress(struct acomp_req *req)
	189	{
	190	return scomp_acomp_comp_decomp(req, 1);
	191	}
	192
	193	static int scomp_acomp_decompress(struct acomp_req *req)
	194	{
	195	return scomp_acomp_comp_decomp(req, 0);
	196	}
	197
	198	static void crypto_exit_scomp_ops_async(struct crypto_tfm *tfm)
	199	{
	200	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	201
	202	crypto_free_scomp(*ctx);
6a8487a1 AB	203
	204	mutex_lock(&scomp_lock);
	205	crypto_scomp_free_all_scratches();
	206	mutex_unlock(&scomp_lock);
1ab53a77 GC	207	}
	208
	209	int crypto_init_scomp_ops_async(struct crypto_tfm *tfm)
	210	{
	211	struct crypto_alg *calg = tfm->__crt_alg;
	212	struct crypto_acomp *crt = __crypto_acomp_tfm(tfm);
	213	struct crypto_scomp **ctx = crypto_tfm_ctx(tfm);
	214	struct crypto_scomp *scomp;
	215
	216	if (!crypto_mod_get(calg))
	217	return -EAGAIN;
	218
	219	scomp = crypto_create_tfm(calg, &crypto_scomp_type);
	220	if (IS_ERR(scomp)) {
	221	crypto_mod_put(calg);
	222	return PTR_ERR(scomp);
	223	}
	224
	225	*ctx = scomp;
	226	tfm->exit = crypto_exit_scomp_ops_async;
	227
	228	crt->compress = scomp_acomp_compress;
	229	crt->decompress = scomp_acomp_decompress;
8cd579d2	230	crt->dst_free = sgl_free;
1ab53a77 GC	231	crt->reqsize = sizeof(void *);
	232
	233	return 0;
	234	}
	235
	236	struct acomp_req crypto_acomp_scomp_alloc_ctx(struct acomp_req req)
	237	{
	238	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	239	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	240	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	241	struct crypto_scomp scomp = tfm_ctx;
	242	void *ctx;
	243
	244	ctx = crypto_scomp_alloc_ctx(scomp);
	245	if (IS_ERR(ctx)) {
	246	kfree(req);
	247	return NULL;
	248	}
	249
	250	*req->__ctx = ctx;
	251
	252	return req;
	253	}
	254
	255	void crypto_acomp_scomp_free_ctx(struct acomp_req *req)
	256	{
	257	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
	258	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
	259	struct crypto_scomp **tfm_ctx = crypto_tfm_ctx(tfm);
	260	struct crypto_scomp scomp = tfm_ctx;
	261	void ctx = req->__ctx;
	262
	263	if (ctx)
	264	crypto_scomp_free_ctx(scomp, ctx);
	265	}
	266
	267	static const struct crypto_type crypto_scomp_type = {
	268	.extsize = crypto_alg_extsize,
	269	.init_tfm = crypto_scomp_init_tfm,
	270	#ifdef CONFIG_PROC_FS
	271	.show = crypto_scomp_show,
	272	#endif
	273	.report = crypto_scomp_report,
	274	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
	275	.maskset = CRYPTO_ALG_TYPE_MASK,
	276	.type = CRYPTO_ALG_TYPE_SCOMPRESS,
	277	.tfmsize = offsetof(struct crypto_scomp, base),
	278	};
	279
	280	int crypto_register_scomp(struct scomp_alg *alg)
	281	{
	282	struct crypto_alg *base = &alg->base;
1ab53a77 GC	283
	284	base->cra_type = &crypto_scomp_type;
	285	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
	286	base->cra_flags \|= CRYPTO_ALG_TYPE_SCOMPRESS;
	287
6a8487a1	288	return crypto_register_alg(base);
1ab53a77 GC	289	}
	290	EXPORT_SYMBOL_GPL(crypto_register_scomp);
	291
	292	int crypto_unregister_scomp(struct scomp_alg *alg)
	293	{
6a8487a1	294	return crypto_unregister_alg(&alg->base);
1ab53a77 GC	295	}
	296	EXPORT_SYMBOL_GPL(crypto_unregister_scomp);
	297
3de4f5e1 GC	298	int crypto_register_scomps(struct scomp_alg *algs, int count)
	299	{
	300	int i, ret;
	301
	302	for (i = 0; i < count; i++) {
	303	ret = crypto_register_scomp(&algs[i]);
	304	if (ret)
	305	goto err;
	306	}
	307
	308	return 0;
	309
	310	err:
	311	for (--i; i >= 0; --i)
	312	crypto_unregister_scomp(&algs[i]);
	313
	314	return ret;
	315	}
	316	EXPORT_SYMBOL_GPL(crypto_register_scomps);
	317
	318	void crypto_unregister_scomps(struct scomp_alg *algs, int count)
	319	{
	320	int i;
	321
	322	for (i = count - 1; i >= 0; --i)
	323	crypto_unregister_scomp(&algs[i]);
	324	}
	325	EXPORT_SYMBOL_GPL(crypto_unregister_scomps);
	326
1ab53a77 GC	327	MODULE_LICENSE("GPL");
1ab53a77 GC	328	MODULE_DESCRIPTION("Synchronous compression type");