1/*
  2 * Asynchronous Compression operations
  3 *
  4 * Copyright (c) 2016, Intel Corporation
  5 * Authors: Weigang Li <weigang.li@intel.com>
  6 *          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 <crypto/algapi.h>
 22#include <linux/cryptouser.h>
 23#include <linux/compiler.h>
 24#include <net/netlink.h>
 25#include <crypto/internal/acompress.h>
 26#include <crypto/internal/scompress.h>
 27#include "internal.h"
 28
 29static const struct crypto_type crypto_acomp_type;
 30
 31#ifdef CONFIG_NET
 32static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 33{
 34	struct crypto_report_acomp racomp;
 35
 36	strncpy(racomp.type, "acomp", sizeof(racomp.type));
 37
 38	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
 39		    sizeof(struct crypto_report_acomp), &racomp))
 40		goto nla_put_failure;
 41	return 0;
 42
 43nla_put_failure:
 44	return -EMSGSIZE;
 45}
 46#else
 47static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 48{
 49	return -ENOSYS;
 50}
 51#endif
 52
 53static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 54	__maybe_unused;
 55
 56static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 57{
 58	seq_puts(m, "type         : acomp\n");
 59}
 60
 61static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
 62{
 63	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
 64	struct acomp_alg *alg = crypto_acomp_alg(acomp);
 65
 66	alg->exit(acomp);
 67}
 68
 69static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
 70{
 71	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
 72	struct acomp_alg *alg = crypto_acomp_alg(acomp);
 73
 74	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
 75		return crypto_init_scomp_ops_async(tfm);
 76
 77	acomp->compress = alg->compress;
 78	acomp->decompress = alg->decompress;
 79	acomp->dst_free = alg->dst_free;
 80	acomp->reqsize = alg->reqsize;
 81
 82	if (alg->exit)
 83		acomp->base.exit = crypto_acomp_exit_tfm;
 84
 85	if (alg->init)
 86		return alg->init(acomp);
 87
 88	return 0;
 89}
 90
 91static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
 92{
 93	int extsize = crypto_alg_extsize(alg);
 94
 95	if (alg->cra_type != &crypto_acomp_type)
 96		extsize += sizeof(struct crypto_scomp *);
 97
 98	return extsize;
 99}
100
101static const struct crypto_type crypto_acomp_type = {
102	.extsize = crypto_acomp_extsize,
103	.init_tfm = crypto_acomp_init_tfm,
104#ifdef CONFIG_PROC_FS
105	.show = crypto_acomp_show,
106#endif
107	.report = crypto_acomp_report,
108	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
109	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
110	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
111	.tfmsize = offsetof(struct crypto_acomp, base),
112};
113
114struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
115					u32 mask)
116{
117	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
118}
119EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
120
121struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
122{
123	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
124	struct acomp_req *req;
125
126	req = __acomp_request_alloc(acomp);
127	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
128		return crypto_acomp_scomp_alloc_ctx(req);
129
130	return req;
131}
132EXPORT_SYMBOL_GPL(acomp_request_alloc);
133
134void acomp_request_free(struct acomp_req *req)
135{
136	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
137	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
138
139	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
140		crypto_acomp_scomp_free_ctx(req);
141
142	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
143		acomp->dst_free(req->dst);
144		req->dst = NULL;
145	}
146
147	__acomp_request_free(req);
148}
149EXPORT_SYMBOL_GPL(acomp_request_free);
150
151int crypto_register_acomp(struct acomp_alg *alg)
152{
153	struct crypto_alg *base = &alg->base;
154
155	base->cra_type = &crypto_acomp_type;
156	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
157	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
158
159	return crypto_register_alg(base);
160}
161EXPORT_SYMBOL_GPL(crypto_register_acomp);
162
163int crypto_unregister_acomp(struct acomp_alg *alg)
164{
165	return crypto_unregister_alg(&alg->base);
166}
167EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
168
169int crypto_register_acomps(struct acomp_alg *algs, int count)
170{
171	int i, ret;
172
173	for (i = 0; i < count; i++) {
174		ret = crypto_register_acomp(&algs[i]);
175		if (ret)
176			goto err;
177	}
178
179	return 0;
180
181err:
182	for (--i; i >= 0; --i)
183		crypto_unregister_acomp(&algs[i]);
184
185	return ret;
186}
187EXPORT_SYMBOL_GPL(crypto_register_acomps);
188
189void crypto_unregister_acomps(struct acomp_alg *algs, int count)
190{
191	int i;
192
193	for (i = count - 1; i >= 0; --i)
194		crypto_unregister_acomp(&algs[i]);
195}
196EXPORT_SYMBOL_GPL(crypto_unregister_acomps);
197
198MODULE_LICENSE("GPL");
199MODULE_DESCRIPTION("Asynchronous compression type");