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/list.h> 15 #include <linux/types.h> 16 #include <linux/workqueue.h> 17 18 /* 19 * Maximum values for blocksize and alignmask, used to allocate 20 * static buffers that are big enough for any combination of 21 * algs and architectures. Ciphers have a lower maximum size. 22 */ 23 #define MAX_ALGAPI_BLOCKSIZE 160 24 #define MAX_ALGAPI_ALIGNMASK 127 25 #define MAX_CIPHER_BLOCKSIZE 16 26 #define MAX_CIPHER_ALIGNMASK 15 27 28 #ifdef ARCH_DMA_MINALIGN 29 #define CRYPTO_DMA_ALIGN ARCH_DMA_MINALIGN 30 #else 31 #define CRYPTO_DMA_ALIGN CRYPTO_MINALIGN 32 #endif 33 34 #define CRYPTO_DMA_PADDING ((CRYPTO_DMA_ALIGN - 1) & ~(CRYPTO_MINALIGN - 1)) 35 36 /* 37 * Autoloaded crypto modules should only use a prefixed name to avoid allowing 38 * arbitrary modules to be loaded. Loading from userspace may still need the 39 * unprefixed names, so retains those aliases as well. 40 * This uses __MODULE_INFO directly instead of MODULE_ALIAS because pre-4.3 41 * gcc (e.g. avr32 toolchain) uses __LINE__ for uniqueness, and this macro 42 * expands twice on the same line. Instead, use a separate base name for the 43 * alias. 44 */ 45 #define MODULE_ALIAS_CRYPTO(name) \ 46 __MODULE_INFO(alias, alias_userspace, name); \ 47 __MODULE_INFO(alias, alias_crypto, "crypto-" name) 48 49 struct crypto_aead; 50 struct crypto_instance; 51 struct module; 52 struct notifier_block; 53 struct rtattr; 54 struct scatterlist; 55 struct seq_file; 56 struct sk_buff; 57 union crypto_no_such_thing; 58 59 struct crypto_instance { 60 struct crypto_alg alg; 61 62 struct crypto_template *tmpl; 63 64 union { 65 /* Node in list of instances after registration. */ 66 struct hlist_node list; 67 /* List of attached spawns before registration. */ 68 struct crypto_spawn *spawns; 69 }; 70 71 struct work_struct free_work; 72 73 void *__ctx[] CRYPTO_MINALIGN_ATTR; 74 }; 75 76 struct crypto_template { 77 struct list_head list; 78 struct hlist_head instances; 79 struct module *module; 80 81 int (*create)(struct crypto_template *tmpl, struct rtattr **tb); 82 83 char name[CRYPTO_MAX_ALG_NAME]; 84 }; 85 86 struct crypto_spawn { 87 struct list_head list; 88 struct crypto_alg *alg; 89 union { 90 /* Back pointer to instance after registration.*/ 91 struct crypto_instance *inst; 92 /* Spawn list pointer prior to registration. */ 93 struct crypto_spawn *next; 94 }; 95 const struct crypto_type *frontend; 96 u32 mask; 97 bool dead; 98 bool registered; 99 }; 100 101 struct crypto_queue { 102 struct list_head list; 103 struct list_head *backlog; 104 105 unsigned int qlen; 106 unsigned int max_qlen; 107 }; 108 109 struct scatter_walk { 110 /* Must be the first member, see struct skcipher_walk. */ 111 union { 112 void *const addr; 113 114 /* Private API field, do not touch. */ 115 union crypto_no_such_thing *__addr; 116 }; 117 struct scatterlist *sg; 118 unsigned int offset; 119 }; 120 121 struct crypto_attr_alg { 122 char name[CRYPTO_MAX_ALG_NAME]; 123 }; 124 125 struct crypto_attr_type { 126 u32 type; 127 u32 mask; 128 }; 129 130 /* 131 * Algorithm registration interface. 132 */ 133 int crypto_register_alg(struct crypto_alg *alg); 134 void crypto_unregister_alg(struct crypto_alg *alg); 135 int crypto_register_algs(struct crypto_alg *algs, int count); 136 void crypto_unregister_algs(struct crypto_alg *algs, int count); 137 138 void crypto_mod_put(struct crypto_alg *alg); 139 140 int crypto_register_template(struct crypto_template *tmpl); 141 int crypto_register_templates(struct crypto_template *tmpls, int count); 142 void crypto_unregister_template(struct crypto_template *tmpl); 143 void crypto_unregister_templates(struct crypto_template *tmpls, int count); 144 struct crypto_template *crypto_lookup_template(const char *name); 145 146 int crypto_register_instance(struct crypto_template *tmpl, 147 struct crypto_instance *inst); 148 void crypto_unregister_instance(struct crypto_instance *inst); 149 150 int crypto_grab_spawn(struct crypto_spawn *spawn, struct crypto_instance *inst, 151 const char *name, u32 type, u32 mask); 152 void crypto_drop_spawn(struct crypto_spawn *spawn); 153 struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type, 154 u32 mask); 155 void *crypto_spawn_tfm2(struct crypto_spawn *spawn); 156 157 struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb); 158 int crypto_check_attr_type(struct rtattr **tb, u32 type, u32 *mask_ret); 159 const char *crypto_attr_alg_name(struct rtattr *rta); 160 int crypto_inst_setname(struct crypto_instance *inst, const char *name, 161 struct crypto_alg *alg); 162 163 void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen); 164 int crypto_enqueue_request(struct crypto_queue *queue, 165 struct crypto_async_request *request); 166 void crypto_enqueue_request_head(struct crypto_queue *queue, 167 struct crypto_async_request *request); 168 struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue); 169 static inline unsigned int crypto_queue_len(struct crypto_queue *queue) 170 { 171 return queue->qlen; 172 } 173 174 void crypto_inc(u8 *a, unsigned int size); 175 176 static inline void *crypto_tfm_ctx(struct crypto_tfm *tfm) 177 { 178 return tfm->__crt_ctx; 179 } 180 181 static inline void *crypto_tfm_ctx_align(struct crypto_tfm *tfm, 182 unsigned int align) 183 { 184 if (align <= crypto_tfm_ctx_alignment()) 185 align = 1; 186 187 return PTR_ALIGN(crypto_tfm_ctx(tfm), align); 188 } 189 190 static inline unsigned int crypto_dma_align(void) 191 { 192 return CRYPTO_DMA_ALIGN; 193 } 194 195 static inline unsigned int crypto_dma_padding(void) 196 { 197 return (crypto_dma_align() - 1) & ~(crypto_tfm_ctx_alignment() - 1); 198 } 199 200 static inline void *crypto_tfm_ctx_dma(struct crypto_tfm *tfm) 201 { 202 return crypto_tfm_ctx_align(tfm, crypto_dma_align()); 203 } 204 205 static inline struct crypto_instance *crypto_tfm_alg_instance( 206 struct crypto_tfm *tfm) 207 { 208 return container_of(tfm->__crt_alg, struct crypto_instance, alg); 209 } 210 211 static inline void *crypto_instance_ctx(struct crypto_instance *inst) 212 { 213 return inst->__ctx; 214 } 215 216 static inline struct crypto_async_request *crypto_get_backlog( 217 struct crypto_queue *queue) 218 { 219 return queue->backlog == &queue->list ? NULL : 220 container_of(queue->backlog, struct crypto_async_request, list); 221 } 222 223 static inline u32 crypto_requires_off(struct crypto_attr_type *algt, u32 off) 224 { 225 return (algt->type ^ off) & algt->mask & off; 226 } 227 228 /* 229 * When an algorithm uses another algorithm (e.g., if it's an instance of a 230 * template), these are the flags that should always be set on the "outer" 231 * algorithm if any "inner" algorithm has them set. 232 */ 233 #define CRYPTO_ALG_INHERITED_FLAGS \ 234 (CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK | \ 235 CRYPTO_ALG_ALLOCATES_MEMORY) 236 237 /* 238 * Given the type and mask that specify the flags restrictions on a template 239 * instance being created, return the mask that should be passed to 240 * crypto_grab_*() (along with type=0) to honor any request the user made to 241 * have any of the CRYPTO_ALG_INHERITED_FLAGS clear. 242 */ 243 static inline u32 crypto_algt_inherited_mask(struct crypto_attr_type *algt) 244 { 245 return crypto_requires_off(algt, CRYPTO_ALG_INHERITED_FLAGS); 246 } 247 248 int crypto_register_notifier(struct notifier_block *nb); 249 int crypto_unregister_notifier(struct notifier_block *nb); 250 251 /* Crypto notification events. */ 252 enum { 253 CRYPTO_MSG_ALG_REQUEST, 254 CRYPTO_MSG_ALG_REGISTER, 255 CRYPTO_MSG_ALG_LOADED, 256 }; 257 258 static inline void crypto_request_complete(struct crypto_async_request *req, 259 int err) 260 { 261 req->complete(req->data, err); 262 } 263 264 static inline u32 crypto_tfm_alg_type(struct crypto_tfm *tfm) 265 { 266 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_TYPE_MASK; 267 } 268 269 static inline bool crypto_request_chained(struct crypto_async_request *req) 270 { 271 return !list_empty(&req->list); 272 } 273 274 static inline bool crypto_tfm_req_chain(struct crypto_tfm *tfm) 275 { 276 return tfm->__crt_alg->cra_flags & CRYPTO_ALG_REQ_CHAIN; 277 } 278 279 #endif /* _CRYPTO_ALGAPI_H */ 280