1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Asynchronous Compression operations 4 * 5 * Copyright (c) 2016, Intel Corporation 6 * Authors: Weigang Li <weigang.li@intel.com> 7 * Giovanni Cabiddu <giovanni.cabiddu@intel.com> 8 */ 9#include <linux/errno.h> 10#include <linux/kernel.h> 11#include <linux/module.h> 12#include <linux/seq_file.h> 13#include <linux/slab.h> 14#include <linux/string.h> 15#include <linux/crypto.h> 16#include <crypto/algapi.h> 17#include <linux/cryptouser.h> 18#include <linux/compiler.h> 19#include <net/netlink.h> 20#include <crypto/internal/acompress.h> 21#include <crypto/internal/scompress.h> 22#include "internal.h" 23 24static const struct crypto_type crypto_acomp_type; 25 26#ifdef CONFIG_NET 27static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg) 28{ 29 struct crypto_report_acomp racomp; 30 31 memset(&racomp, 0, sizeof(racomp)); 32 33 strscpy(racomp.type, "acomp", sizeof(racomp.type)); 34 35 return nla_put(skb, CRYPTOCFGA_REPORT_ACOMP, sizeof(racomp), &racomp); 36} 37#else 38static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg) 39{ 40 return -ENOSYS; 41} 42#endif 43 44static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg) 45 __maybe_unused; 46 47static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg) 48{ 49 seq_puts(m, "type : acomp\n"); 50} 51 52static void crypto_acomp_exit_tfm(struct crypto_tfm *tfm) 53{ 54 struct crypto_acomp *acomp = __crypto_acomp_tfm(tfm); 55 struct acomp_alg *alg = crypto_acomp_alg(acomp); 56 57 alg->exit(acomp); 58} 59 60static int crypto_acomp_init_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 if (tfm->__crt_alg->cra_type != &crypto_acomp_type) 66 return crypto_init_scomp_ops_async(tfm); 67 68 acomp->compress = alg->compress; 69 acomp->decompress = alg->decompress; 70 acomp->dst_free = alg->dst_free; 71 acomp->reqsize = alg->reqsize; 72 73 if (alg->exit) 74 acomp->base.exit = crypto_acomp_exit_tfm; 75 76 if (alg->init) 77 return alg->init(acomp); 78 79 return 0; 80} 81 82static unsigned int crypto_acomp_extsize(struct crypto_alg *alg) 83{ 84 int extsize = crypto_alg_extsize(alg); 85 86 if (alg->cra_type != &crypto_acomp_type) 87 extsize += sizeof(struct crypto_scomp *); 88 89 return extsize; 90} 91 92static const struct crypto_type crypto_acomp_type = { 93 .extsize = crypto_acomp_extsize, 94 .init_tfm = crypto_acomp_init_tfm, 95#ifdef CONFIG_PROC_FS 96 .show = crypto_acomp_show, 97#endif 98 .report = crypto_acomp_report, 99 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 100 .maskset = CRYPTO_ALG_TYPE_ACOMPRESS_MASK, 101 .type = CRYPTO_ALG_TYPE_ACOMPRESS, 102 .tfmsize = offsetof(struct crypto_acomp, base), 103}; 104 105struct crypto_acomp *crypto_alloc_acomp(const char *alg_name, u32 type, 106 u32 mask) 107{ 108 return crypto_alloc_tfm(alg_name, &crypto_acomp_type, type, mask); 109} 110EXPORT_SYMBOL_GPL(crypto_alloc_acomp); 111 112struct crypto_acomp *crypto_alloc_acomp_node(const char *alg_name, u32 type, 113 u32 mask, int node) 114{ 115 return crypto_alloc_tfm_node(alg_name, &crypto_acomp_type, type, mask, 116 node); 117} 118EXPORT_SYMBOL_GPL(crypto_alloc_acomp_node); 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 162void crypto_unregister_acomp(struct acomp_alg *alg) 163{ 164 crypto_unregister_alg(&alg->base); 165} 166EXPORT_SYMBOL_GPL(crypto_unregister_acomp); 167 168int crypto_register_acomps(struct acomp_alg *algs, int count) 169{ 170 int i, ret; 171 172 for (i = 0; i < count; i++) { 173 ret = crypto_register_acomp(&algs[i]); 174 if (ret) 175 goto err; 176 } 177 178 return 0; 179 180err: 181 for (--i; i >= 0; --i) 182 crypto_unregister_acomp(&algs[i]); 183 184 return ret; 185} 186EXPORT_SYMBOL_GPL(crypto_register_acomps); 187 188void crypto_unregister_acomps(struct acomp_alg *algs, int count) 189{ 190 int i; 191 192 for (i = count - 1; i >= 0; --i) 193 crypto_unregister_acomp(&algs[i]); 194} 195EXPORT_SYMBOL_GPL(crypto_unregister_acomps); 196 197MODULE_LICENSE("GPL"); 198MODULE_DESCRIPTION("Asynchronous compression type"); 199