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