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 <net/netlink.h>
 24#include <crypto/internal/acompress.h>
 25#include <crypto/internal/scompress.h>
 26#include "internal.h"
 27
 28static const struct crypto_type crypto_acomp_type;
 29
 30#ifdef CONFIG_NET
 31static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 32{
 33	struct crypto_report_acomp racomp;
 34
 35	strncpy(racomp.type, "acomp", sizeof(racomp.type));
 36
 37	if (nla_put(skb, CRYPTOCFGA_REPORT_ACOMP,
 38		    sizeof(struct crypto_report_acomp), &racomp))
 39		goto nla_put_failure;
 40	return 0;
 41
 42nla_put_failure:
 43	return -EMSGSIZE;
 44}
 45#else
 46static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg)
 47{
 48	return -ENOSYS;
 49}
 50#endif
 51
 52static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 53	__attribute__ ((unused));
 54
 55static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg)
 56{
 57	seq_puts(m, "type         : acomp\n");
 58}
 59
 60static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm)
 61{
 62	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
 63	struct acomp_alg *alg = crypto_acomp_alg(acomp);
 64
 65	alg->exit(acomp);
 66}
 67
 68static int crypto_acomp_init_tfm(struct crypto_tfm *tfm)
 69{
 70	struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm);
 71	struct acomp_alg *alg = crypto_acomp_alg(acomp);
 72
 73	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
 74		return crypto_init_scomp_ops_async(tfm);
 75
 76	acomp->compress = alg->compress;
 77	acomp->decompress = alg->decompress;
 78	acomp->dst_free = alg->dst_free;
 79	acomp->reqsize = alg->reqsize;
 80
 81	if (alg->exit)
 82		acomp->base.exit = crypto_acomp_exit_tfm;
 83
 84	if (alg->init)
 85		return alg->init(acomp);
 86
 87	return 0;
 88}
 89
 90static unsigned int crypto_acomp_extsize(struct crypto_alg *alg)
 91{
 92	int extsize = crypto_alg_extsize(alg);
 93
 94	if (alg->cra_type != &crypto_acomp_type)
 95		extsize += sizeof(struct crypto_scomp *);
 96
 97	return extsize;
 98}
 99
100static const struct crypto_type crypto_acomp_type = {
101	.extsize = crypto_acomp_extsize,
102	.init_tfm = crypto_acomp_init_tfm,
103#ifdef CONFIG_PROC_FS
104	.show = crypto_acomp_show,
105#endif
106	.report = crypto_acomp_report,
107	.maskclear = ~CRYPTO_ALG_TYPE_MASK,
108	.maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK,
109	.type = CRYPTO_ALG_TYPE_ACOMPRESS,
110	.tfmsize = offsetof(struct crypto_acomp, base),
111};
112
113struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type,
114					u32 mask)
115{
116	return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask);
117}
118EXPORT_SYMBOL_GPL(crypto_alloc_acomp);
119
120struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp)
121{
122	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
123	struct acomp_req *req;
124
125	req = __acomp_request_alloc(acomp);
126	if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type))
127		return crypto_acomp_scomp_alloc_ctx(req);
128
129	return req;
130}
131EXPORT_SYMBOL_GPL(acomp_request_alloc);
132
133void acomp_request_free(struct acomp_req *req)
134{
135	struct crypto_acomp *acomp = crypto_acomp_reqtfm(req);
136	struct crypto_tfm *tfm = crypto_acomp_tfm(acomp);
137
138	if (tfm->__crt_alg->cra_type != &crypto_acomp_type)
139		crypto_acomp_scomp_free_ctx(req);
140
141	if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) {
142		acomp->dst_free(req->dst);
143		req->dst = NULL;
144	}
145
146	__acomp_request_free(req);
147}
148EXPORT_SYMBOL_GPL(acomp_request_free);
149
150int crypto_register_acomp(struct acomp_alg *alg)
151{
152	struct crypto_alg *base = &alg->base;
153
154	base->cra_type = &crypto_acomp_type;
155	base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
156	base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS;
157
158	return crypto_register_alg(base);
159}
160EXPORT_SYMBOL_GPL(crypto_register_acomp);
161
162int crypto_unregister_acomp(struct acomp_alg *alg)
163{
164	return crypto_unregister_alg(&alg->base);
165}
166EXPORT_SYMBOL_GPL(crypto_unregister_acomp);
167
168MODULE_LICENSE("GPL");
169MODULE_DESCRIPTION("Asynchronous compression type");