diff options
| -rw-r--r-- | crypto/algapi.c | 156 | ||||
| -rw-r--r-- | crypto/internal.h | 17 | ||||
| -rw-r--r-- | include/crypto/algapi.h | 31 |
3 files changed, 182 insertions, 22 deletions
diff --git a/crypto/algapi.c b/crypto/algapi.c index a65c6ccfbe1..232b37d8161 100644 --- a/crypto/algapi.c +++ b/crypto/algapi.c @@ -13,11 +13,14 @@ #include <linux/errno.h> #include <linux/init.h> #include <linux/kernel.h> +#include <linux/list.h> #include <linux/module.h> #include <linux/string.h> #include "internal.h" +static LIST_HEAD(crypto_template_list); + static inline int crypto_set_driver_name(struct crypto_alg *alg) { static const char suffix[] = "-generic"; @@ -35,11 +38,8 @@ static inline int crypto_set_driver_name(struct crypto_alg *alg) return 0; } -int crypto_register_alg(struct crypto_alg *alg) +static int crypto_check_alg(struct crypto_alg *alg) { - int ret; - struct crypto_alg *q; - if (alg->cra_alignmask & (alg->cra_alignmask + 1)) return -EINVAL; @@ -51,42 +51,52 @@ int crypto_register_alg(struct crypto_alg *alg) if (alg->cra_priority < 0) return -EINVAL; - - ret = crypto_set_driver_name(alg); - if (unlikely(ret)) - return ret; - down_write(&crypto_alg_sem); - + return crypto_set_driver_name(alg); +} + +static int __crypto_register_alg(struct crypto_alg *alg) +{ + struct crypto_alg *q; + int ret = -EEXIST; + list_for_each_entry(q, &crypto_alg_list, cra_list) { - if (q == alg) { - ret = -EEXIST; + if (q == alg) goto out; - } } list_add(&alg->cra_list, &crypto_alg_list); atomic_set(&alg->cra_refcnt, 1); + ret = 0; out: - up_write(&crypto_alg_sem); return ret; } + +int crypto_register_alg(struct crypto_alg *alg) +{ + int err; + + err = crypto_check_alg(alg); + if (err) + return err; + + down_write(&crypto_alg_sem); + err = __crypto_register_alg(alg); + up_write(&crypto_alg_sem); + + return err; +} EXPORT_SYMBOL_GPL(crypto_register_alg); int crypto_unregister_alg(struct crypto_alg *alg) { int ret = -ENOENT; - struct crypto_alg *q; down_write(&crypto_alg_sem); - list_for_each_entry(q, &crypto_alg_list, cra_list) { - if (alg == q) { - list_del(&alg->cra_list); - ret = 0; - goto out; - } + if (likely(!list_empty(&alg->cra_list))) { + list_del_init(&alg->cra_list); + ret = 0; } -out: up_write(&crypto_alg_sem); if (ret) @@ -100,6 +110,108 @@ out: } EXPORT_SYMBOL_GPL(crypto_unregister_alg); +int crypto_register_template(struct crypto_template *tmpl) +{ + struct crypto_template *q; + int err = -EEXIST; + + down_write(&crypto_alg_sem); + + list_for_each_entry(q, &crypto_template_list, list) { + if (q == tmpl) + goto out; + } + + list_add(&tmpl->list, &crypto_template_list); + err = 0; +out: + up_write(&crypto_alg_sem); + return err; +} +EXPORT_SYMBOL_GPL(crypto_register_template); + +void crypto_unregister_template(struct crypto_template *tmpl) +{ + struct crypto_instance *inst; + struct hlist_node *p, *n; + struct hlist_head *list; + + down_write(&crypto_alg_sem); + + BUG_ON(list_empty(&tmpl->list)); + list_del_init(&tmpl->list); + + list = &tmpl->instances; + hlist_for_each_entry(inst, p, list, list) { + BUG_ON(list_empty(&inst->alg.cra_list)); + list_del_init(&inst->alg.cra_list); + } + + up_write(&crypto_alg_sem); + + hlist_for_each_entry_safe(inst, p, n, list, list) { + BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1); + tmpl->free(inst); + } +} +EXPORT_SYMBOL_GPL(crypto_unregister_template); + +static struct crypto_template *__crypto_lookup_template(const char *name) +{ + struct crypto_template *q, *tmpl = NULL; + + down_read(&crypto_alg_sem); + list_for_each_entry(q, &crypto_template_list, list) { + if (strcmp(q->name, name)) + continue; + if (unlikely(!crypto_tmpl_get(q))) + continue; + + tmpl = q; + break; + } + up_read(&crypto_alg_sem); + + return tmpl; +} + +struct crypto_template *crypto_lookup_template(const char *name) +{ + return try_then_request_module(__crypto_lookup_template(name), name); +} +EXPORT_SYMBOL_GPL(crypto_lookup_template); + +int crypto_register_instance(struct crypto_template *tmpl, + struct crypto_instance *inst) +{ + int err = -EINVAL; + + if (inst->alg.cra_destroy) + goto err; + + err = crypto_check_alg(&inst->alg); + if (err) + goto err; + + inst->alg.cra_module = tmpl->module; + + down_write(&crypto_alg_sem); + + err = __crypto_register_alg(&inst->alg); + if (err) + goto unlock; + + hlist_add_head(&inst->list, &tmpl->instances); + inst->tmpl = tmpl; + +unlock: + up_write(&crypto_alg_sem); + +err: + return err; +} +EXPORT_SYMBOL_GPL(crypto_register_instance); + static int __init crypto_algapi_init(void) { crypto_init_proc(); diff --git a/crypto/internal.h b/crypto/internal.h index 26f47d33155..c3ab4a950f3 100644 --- a/crypto/internal.h +++ b/crypto/internal.h @@ -19,11 +19,15 @@ #include <linux/interrupt.h> #include <linux/init.h> #include <linux/list.h> +#include <linux/module.h> #include <linux/kernel.h> #include <linux/rwsem.h> #include <linux/slab.h> #include <asm/kmap_types.h> +struct crypto_instance; +struct crypto_template; + extern struct list_head crypto_alg_list; extern struct rw_semaphore crypto_alg_sem; @@ -112,5 +116,18 @@ void crypto_exit_digest_ops(struct crypto_tfm *tfm); void crypto_exit_cipher_ops(struct crypto_tfm *tfm); void crypto_exit_compress_ops(struct crypto_tfm *tfm); +int crypto_register_instance(struct crypto_template *tmpl, + struct crypto_instance *inst); + +static inline int crypto_tmpl_get(struct crypto_template *tmpl) +{ + return try_module_get(tmpl->module); +} + +static inline void crypto_tmpl_put(struct crypto_template *tmpl) +{ + module_put(tmpl->module); +} + #endif /* _CRYPTO_INTERNAL_H */ diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h index ed68d494b36..ffec530d52f 100644 --- a/include/crypto/algapi.h +++ b/include/crypto/algapi.h @@ -14,5 +14,36 @@ #include <linux/crypto.h> +struct module; + +struct crypto_instance { + struct crypto_alg alg; + + struct crypto_template *tmpl; + struct hlist_node list; + + void *__ctx[] CRYPTO_MINALIGN_ATTR; +}; + +struct crypto_template { + struct list_head list; + struct hlist_head instances; + struct module *module; + + struct crypto_instance *(*alloc)(void *param, unsigned int len); + void (*free)(struct crypto_instance *inst); + + char name[CRYPTO_MAX_ALG_NAME]; +}; + +int crypto_register_template(struct crypto_template *tmpl); +void crypto_unregister_template(struct crypto_template *tmpl); +struct crypto_template *crypto_lookup_template(const char *name); + +static inline void *crypto_instance_ctx(struct crypto_instance *inst) +{ + return inst->__ctx; +} + #endif /* _CRYPTO_ALGAPI_H */ |