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 24 static const struct crypto_type crypto_acomp_type; 25 26 #ifdef CONFIG_NET 27 static 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 38 static int crypto_acomp_report(struct sk_buff *skb, struct crypto_alg *alg) 39 { 40 return -ENOSYS; 41 } 42 #endif 43 44 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg) 45 __maybe_unused; 46 47 static void crypto_acomp_show(struct seq_file *m, struct crypto_alg *alg) 48 { 49 seq_puts(m, "type : acomp\n"); 50 } 51 52 static 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 60 static 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 82 static 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 92 static 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 }; 104 105 struct 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 } 110 EXPORT_SYMBOL_GPL(crypto_alloc_acomp); 111 112 struct acomp_req *acomp_request_alloc(struct crypto_acomp *acomp) 113 { 114 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp); 115 struct acomp_req *req; 116 117 req = __acomp_request_alloc(acomp); 118 if (req && (tfm->__crt_alg->cra_type != &crypto_acomp_type)) 119 return crypto_acomp_scomp_alloc_ctx(req); 120 121 return req; 122 } 123 EXPORT_SYMBOL_GPL(acomp_request_alloc); 124 125 void acomp_request_free(struct acomp_req *req) 126 { 127 struct crypto_acomp *acomp = crypto_acomp_reqtfm(req); 128 struct crypto_tfm *tfm = crypto_acomp_tfm(acomp); 129 130 if (tfm->__crt_alg->cra_type != &crypto_acomp_type) 131 crypto_acomp_scomp_free_ctx(req); 132 133 if (req->flags & CRYPTO_ACOMP_ALLOC_OUTPUT) { 134 acomp->dst_free(req->dst); 135 req->dst = NULL; 136 } 137 138 __acomp_request_free(req); 139 } 140 EXPORT_SYMBOL_GPL(acomp_request_free); 141 142 int crypto_register_acomp(struct acomp_alg *alg) 143 { 144 struct crypto_alg *base = &alg->base; 145 146 base->cra_type = &crypto_acomp_type; 147 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 148 base->cra_flags |= CRYPTO_ALG_TYPE_ACOMPRESS; 149 150 return crypto_register_alg(base); 151 } 152 EXPORT_SYMBOL_GPL(crypto_register_acomp); 153 154 void crypto_unregister_acomp(struct acomp_alg *alg) 155 { 156 crypto_unregister_alg(&alg->base); 157 } 158 EXPORT_SYMBOL_GPL(crypto_unregister_acomp); 159 160 int crypto_register_acomps(struct acomp_alg *algs, int count) 161 { 162 int i, ret; 163 164 for (i = 0; i < count; i++) { 165 ret = crypto_register_acomp(&algs[i]); 166 if (ret) 167 goto err; 168 } 169 170 return 0; 171 172 err: 173 for (--i; i >= 0; --i) 174 crypto_unregister_acomp(&algs[i]); 175 176 return ret; 177 } 178 EXPORT_SYMBOL_GPL(crypto_register_acomps); 179 180 void crypto_unregister_acomps(struct acomp_alg *algs, int count) 181 { 182 int i; 183 184 for (i = count - 1; i >= 0; --i) 185 crypto_unregister_acomp(&algs[i]); 186 } 187 EXPORT_SYMBOL_GPL(crypto_unregister_acomps); 188 189 MODULE_LICENSE("GPL"); 190 MODULE_DESCRIPTION("Asynchronous compression type"); 191