1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Cryptographic API for algorithms (i.e., low-level API). 4 * 5 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 #ifndef _CRYPTO_ALGAPI_H 8 #define _CRYPTO_ALGAPI_H 9 10 #include <crypto/utils.h> 11 #include <linux/align.h> 12 #include <linux/cache.h> 13 #include <linux/crypto.h> 14 #include <linux/types.h> 15 #include <linux/workqueue.h> 16 17 /* 18 * Maximum values for blocksize and alignmask, used to allocate 19 * static buffers that are big enough for any combination of 20 * algs and architectures. Ciphers have a lower maximum size. 21 */ 22 #define MAX_ALGAPI_BLOCKSIZE 160 23 #define MAX_ALGAPI_ALIGNMASK 127 24 #define MAX_CIPHER_BLOCKSIZE 16 25 #define MAX_CIPHER_ALIGNMASK 15 26 27 #ifdef ARCH_DMA_MINALIGN 28 #define CRYPTO_DMA_ALIGN ARCH_DMA_MINALIGN 29 #else 30 #define CRYPTO_DMA_ALIGN CRYPTO_MINALIGN 31 #endif 32 33 #define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1)) 34 35 /* 36 * Autoloaded crypto modules should only use a prefixed name to avoid allowing 37 * arbitrary modules to be loaded. Loading from userspace may still need the 38 * unprefixed names, so retains those aliases as well. 39 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3 40 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro 41 * expands twice on the same line. Instead, use a separate base name for the 42 * alias. 43 */ 44 #define MODULE_ALIAS_CRYPTO(name) \ 45 __MODULE_INFO(alias, alias_userspace, name); \ 46 __MODULE_INFO(alias, alias_crypto, "crypto-" name) 47 48 struct crypto_aead; 49 struct crypto_instance; 50 struct module; 51 struct notifier_block; 52 struct rtattr; 53 struct scatterlist; 54 struct seq_file; 55 struct sk_buff; 56 57 struct crypto_type { 58 unsigned int (*ctxsize)(struct crypto_alg *alg, u32 type, u32 mask); 59 unsigned int (*extsize)(struct crypto_alg *alg); 60 int (*init_tfm)(struct crypto_tfm *tfm); 61 void (*show)(struct seq_file *m, struct crypto_alg *alg); 62 int (*report)(struct sk_buff *skb, struct crypto_alg *alg); 63 void (*free)(struct crypto_instance *inst); 64 #ifdef CONFIG_CRYPTO_STATS 65 int (*report_stat)(struct sk_buff *skb, struct crypto_alg *alg); 66 #endif 67 68 unsigned int type; 69 unsigned int maskclear; 70 unsigned int maskset; 71 unsigned int tfmsize; 72 }; 73 74 struct crypto_instance { 75 struct crypto_alg alg; 76 77 struct crypto_template *tmpl; 78 79 union { 80 /* Node in list of instances after registration. */ 81 struct hlist_node list; 82 /* List of attached spawns before registration. */ 83 struct crypto_spawn *spawns; 84 }; 85 86 struct work_struct free_work; 87 88 void *__ctx[] CRYPTO_MINALIGN_ATTR; 89 }; 90 91 struct crypto_template { 92 struct list_head list; 93 struct hlist_head instances; 94 struct module *module; 95 96 int (*create)(struct crypto_template *tmpl, struct rtattr **tb); 97 98 char name[CRYPTO_MAX_ALG_NAME]; 99 }; 100 101 struct crypto_spawn { 102 struct list_head list; 103 struct crypto_alg *alg; 104 union { 105 /* Back pointer to instance after registration.*/ 106 struct crypto_instance *inst; 107 /* Spawn list pointer prior to registration. */ 108 struct crypto_spawn *next; 109 }; 110 const struct crypto_type *frontend; 111 u32 mask; 112 bool dead; 113 bool registered; 114 }; 115 116 struct crypto_queue { 117 struct list_head list; 118 struct list_head *backlog; 119 120 unsigned int qlen; 121 unsigned int max_qlen; 122 }; 123 124 struct scatter_walk { 125 struct scatterlist *sg; 126 unsigned int offset; 127 }; 128 129 struct crypto_attr_alg { 130 char name[CRYPTO_MAX_ALG_NAME]; 131 }; 132 133 struct crypto_attr_type { 134 u32 type; 135 u32 mask; 136 }; 137 138 /* 139 * Algorithm registration interface. 140 */ 141 int crypto_register_alg(struct crypto_alg *alg); 142 void crypto_unregister_alg(struct crypto_alg *alg); 143 int crypto_register_algs(struct crypto_alg *algs, int count); 144 void crypto_unregister_algs(struct crypto_alg *algs, int count); 145 146 void crypto_mod_put(struct crypto_alg *alg); 147 148 int crypto_register_template(struct crypto_template *tmpl); 149 int crypto_register_templates(struct crypto_template *tmpls, int count); 150 void crypto_unregister_template(struct crypto_template *tmpl); 151 void crypto_unregister_templates(struct crypto_template *tmpls, int count); 152 struct crypto_template *crypto_lookup_template(const char *name); 153 154 int crypto_register_instance(struct crypto_template *tmpl, 155 struct crypto_instance *inst); 156 void crypto_unregister_instance(struct crypto_instance *inst); 157 158 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, 159 const char *name, u32 type, u32 mask); 160 void crypto_drop_spawn(struct crypto_spawn *spawn); 161 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 162 u32 mask); 163 void *crypto_spawn_tfm2(struct crypto_spawn *spawn); 164 165 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb); 166 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret); 167 const char *crypto_attr_alg_name(struct rtattr *rta); 168 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 169 struct crypto_alg *alg); 170 171 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen); 172 int crypto_enqueue_request(struct crypto_queue *queue, 173 struct crypto_async_request *request); 174 void crypto_enqueue_request_head(struct crypto_queue *queue, 175 struct crypto_async_request *request); 176 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue); 177 static inline unsigned int crypto_queue_len(struct crypto_queue *queue) 178 { 179 return queue->qlen; 180 } 181 182 void crypto_inc(u8 *a, unsigned int size); 183 184 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm) 185 { 186 return tfm->__crt_ctx; 187 } 188 189 static inline void *crypto_tfm_ctx_align(struct crypto_tfm *tfm, 190 unsigned int align) 191 { 192 if (align <= crypto_tfm_ctx_alignment()) 193 align = 1; 194 195 return PTR_ALIGN(crypto_tfm_ctx(tfm), align); 196 } 197 198 static inline unsigned int crypto_dma_align(void) 199 { 200 return CRYPTO_DMA_ALIGN; 201 } 202 203 static inline unsigned int crypto_dma_padding(void) 204 { 205 return (crypto_dma_align() - 1) & ~(crypto_tfm_ctx_alignment() - 1); 206 } 207 208 static inline void *crypto_tfm_ctx_dma(struct crypto_tfm *tfm) 209 { 210 return crypto_tfm_ctx_align(tfm, crypto_dma_align()); 211 } 212 213 static inline struct crypto_instance *crypto_tfm_alg_instance( 214 struct crypto_tfm *tfm) 215 { 216 return container_of(tfm->__crt_alg, struct crypto_instance, alg); 217 } 218 219 static inline void *crypto_instance_ctx(struct crypto_instance *inst) 220 { 221 return inst->__ctx; 222 } 223 224 static inline struct crypto_async_request *crypto_get_backlog( 225 struct crypto_queue *queue) 226 { 227 return queue->backlog == &queue->list ? NULL : 228 container_of(queue->backlog, struct crypto_async_request, list); 229 } 230 231 static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off) 232 { 233 return (algt->type ^ off) & algt->mask & off; 234 } 235 236 /* 237 * When an algorithm uses another algorithm (e.g., if it's an instance of a 238 * template), these are the flags that should always be set on the "outer" 239 * algorithm if any "inner" algorithm has them set. 240 */ 241 #define CRYPTO_ALG_INHERITED_FLAGS \ 242 (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \ 243 CRYPTO_ALG_ALLOCATES_MEMORY) 244 245 /* 246 * Given the type and mask that specify the flags restrictions on a template 247 * instance being created, return the mask that should be passed to 248 * crypto_grab_*() (along with type=0) to honor any request the user made to 249 * have any of the CRYPTO_ALG_INHERITED_FLAGS clear. 250 */ 251 static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt) 252 { 253 return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS); 254 } 255 256 int crypto_register_notifier(struct notifier_block *nb); 257 int crypto_unregister_notifier(struct notifier_block *nb); 258 259 /* Crypto notification events. */ 260 enum { 261 CRYPTO_MSG_ALG_REQUEST, 262 CRYPTO_MSG_ALG_REGISTER, 263 CRYPTO_MSG_ALG_LOADED, 264 }; 265 266 static inline void crypto_request_complete(struct crypto_async_request *req, 267 int err) 268 { 269 req->complete(req->data, err); 270 } 271 272 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm) 273 { 274 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK; 275 } 276 277 #endif /* _CRYPTO_ALGAPI_H */ 278