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ebc610e5bc
This patch passes the type/mask along when constructing instances of templates. This is in preparation for templates that may support multiple types of instances depending on what is requested. For example, the planned software async crypto driver will use this construct. For the moment this allows us to check whether the instance constructed is of the correct type and avoid returning success if the type does not match. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
525 lines
11 KiB
C
525 lines
11 KiB
C
/*
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* Cryptographic API for algorithms (i.e., low-level API).
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*
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* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/string.h>
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#include "internal.h"
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static LIST_HEAD(crypto_template_list);
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void crypto_larval_error(const char *name, u32 type, u32 mask)
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{
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struct crypto_alg *alg;
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down_read(&crypto_alg_sem);
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alg = __crypto_alg_lookup(name, type, mask);
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up_read(&crypto_alg_sem);
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if (alg) {
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if (crypto_is_larval(alg)) {
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struct crypto_larval *larval = (void *)alg;
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complete(&larval->completion);
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}
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crypto_mod_put(alg);
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}
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}
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EXPORT_SYMBOL_GPL(crypto_larval_error);
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static inline int crypto_set_driver_name(struct crypto_alg *alg)
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{
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static const char suffix[] = "-generic";
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char *driver_name = alg->cra_driver_name;
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int len;
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if (*driver_name)
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return 0;
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len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
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if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
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return -ENAMETOOLONG;
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memcpy(driver_name + len, suffix, sizeof(suffix));
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return 0;
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}
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static int crypto_check_alg(struct crypto_alg *alg)
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{
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if (alg->cra_alignmask & (alg->cra_alignmask + 1))
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return -EINVAL;
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if (alg->cra_alignmask & alg->cra_blocksize)
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return -EINVAL;
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if (alg->cra_blocksize > PAGE_SIZE / 8)
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return -EINVAL;
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if (alg->cra_priority < 0)
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return -EINVAL;
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return crypto_set_driver_name(alg);
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}
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static void crypto_destroy_instance(struct crypto_alg *alg)
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{
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struct crypto_instance *inst = (void *)alg;
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struct crypto_template *tmpl = inst->tmpl;
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tmpl->free(inst);
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crypto_tmpl_put(tmpl);
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}
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static void crypto_remove_spawns(struct list_head *spawns,
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struct list_head *list)
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{
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struct crypto_spawn *spawn, *n;
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list_for_each_entry_safe(spawn, n, spawns, list) {
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struct crypto_instance *inst = spawn->inst;
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struct crypto_template *tmpl = inst->tmpl;
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list_del_init(&spawn->list);
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spawn->alg = NULL;
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if (crypto_is_dead(&inst->alg))
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continue;
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inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
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if (!tmpl || !crypto_tmpl_get(tmpl))
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continue;
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crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
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list_move(&inst->alg.cra_list, list);
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hlist_del(&inst->list);
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inst->alg.cra_destroy = crypto_destroy_instance;
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if (!list_empty(&inst->alg.cra_users)) {
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if (&n->list == spawns)
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n = list_entry(inst->alg.cra_users.next,
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typeof(*n), list);
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__list_splice(&inst->alg.cra_users, spawns->prev);
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}
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}
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}
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static int __crypto_register_alg(struct crypto_alg *alg,
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struct list_head *list)
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{
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struct crypto_alg *q;
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int ret = -EAGAIN;
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if (crypto_is_dead(alg))
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goto out;
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INIT_LIST_HEAD(&alg->cra_users);
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ret = -EEXIST;
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atomic_set(&alg->cra_refcnt, 1);
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list_for_each_entry(q, &crypto_alg_list, cra_list) {
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if (q == alg)
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goto out;
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if (crypto_is_moribund(q))
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continue;
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if (crypto_is_larval(q)) {
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struct crypto_larval *larval = (void *)q;
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if (strcmp(alg->cra_name, q->cra_name) &&
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strcmp(alg->cra_driver_name, q->cra_name))
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continue;
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if (larval->adult)
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continue;
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if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
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continue;
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if (!crypto_mod_get(alg))
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continue;
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larval->adult = alg;
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complete(&larval->completion);
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continue;
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}
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if (strcmp(alg->cra_name, q->cra_name))
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continue;
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if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
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q->cra_priority > alg->cra_priority)
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continue;
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crypto_remove_spawns(&q->cra_users, list);
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}
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list_add(&alg->cra_list, &crypto_alg_list);
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crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
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ret = 0;
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out:
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return ret;
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}
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static void crypto_remove_final(struct list_head *list)
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{
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struct crypto_alg *alg;
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struct crypto_alg *n;
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list_for_each_entry_safe(alg, n, list, cra_list) {
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list_del_init(&alg->cra_list);
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crypto_alg_put(alg);
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}
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}
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int crypto_register_alg(struct crypto_alg *alg)
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{
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LIST_HEAD(list);
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int err;
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err = crypto_check_alg(alg);
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if (err)
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return err;
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down_write(&crypto_alg_sem);
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err = __crypto_register_alg(alg, &list);
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up_write(&crypto_alg_sem);
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crypto_remove_final(&list);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_register_alg);
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static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
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{
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if (unlikely(list_empty(&alg->cra_list)))
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return -ENOENT;
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alg->cra_flags |= CRYPTO_ALG_DEAD;
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crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
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list_del_init(&alg->cra_list);
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crypto_remove_spawns(&alg->cra_users, list);
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return 0;
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}
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int crypto_unregister_alg(struct crypto_alg *alg)
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{
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int ret;
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LIST_HEAD(list);
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down_write(&crypto_alg_sem);
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ret = crypto_remove_alg(alg, &list);
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up_write(&crypto_alg_sem);
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if (ret)
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return ret;
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BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
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if (alg->cra_destroy)
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alg->cra_destroy(alg);
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crypto_remove_final(&list);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_alg);
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int crypto_register_template(struct crypto_template *tmpl)
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{
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struct crypto_template *q;
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int err = -EEXIST;
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down_write(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_template_list, list) {
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if (q == tmpl)
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goto out;
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}
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list_add(&tmpl->list, &crypto_template_list);
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crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
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err = 0;
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out:
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up_write(&crypto_alg_sem);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_register_template);
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void crypto_unregister_template(struct crypto_template *tmpl)
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{
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struct crypto_instance *inst;
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struct hlist_node *p, *n;
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struct hlist_head *list;
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LIST_HEAD(users);
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down_write(&crypto_alg_sem);
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BUG_ON(list_empty(&tmpl->list));
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list_del_init(&tmpl->list);
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list = &tmpl->instances;
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hlist_for_each_entry(inst, p, list, list) {
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int err = crypto_remove_alg(&inst->alg, &users);
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BUG_ON(err);
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}
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crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
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up_write(&crypto_alg_sem);
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hlist_for_each_entry_safe(inst, p, n, list, list) {
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BUG_ON(atomic_read(&inst->alg.cra_refcnt) != 1);
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tmpl->free(inst);
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}
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crypto_remove_final(&users);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_template);
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static struct crypto_template *__crypto_lookup_template(const char *name)
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{
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struct crypto_template *q, *tmpl = NULL;
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down_read(&crypto_alg_sem);
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list_for_each_entry(q, &crypto_template_list, list) {
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if (strcmp(q->name, name))
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continue;
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if (unlikely(!crypto_tmpl_get(q)))
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continue;
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tmpl = q;
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break;
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}
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up_read(&crypto_alg_sem);
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return tmpl;
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}
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struct crypto_template *crypto_lookup_template(const char *name)
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{
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return try_then_request_module(__crypto_lookup_template(name), name);
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}
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EXPORT_SYMBOL_GPL(crypto_lookup_template);
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int crypto_register_instance(struct crypto_template *tmpl,
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struct crypto_instance *inst)
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{
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LIST_HEAD(list);
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int err = -EINVAL;
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if (inst->alg.cra_destroy)
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goto err;
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err = crypto_check_alg(&inst->alg);
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if (err)
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goto err;
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inst->alg.cra_module = tmpl->module;
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down_write(&crypto_alg_sem);
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err = __crypto_register_alg(&inst->alg, &list);
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if (err)
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goto unlock;
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hlist_add_head(&inst->list, &tmpl->instances);
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inst->tmpl = tmpl;
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unlock:
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up_write(&crypto_alg_sem);
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crypto_remove_final(&list);
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err:
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_register_instance);
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int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
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struct crypto_instance *inst)
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{
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int err = -EAGAIN;
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spawn->inst = inst;
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down_write(&crypto_alg_sem);
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if (!crypto_is_moribund(alg)) {
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list_add(&spawn->list, &alg->cra_users);
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spawn->alg = alg;
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err = 0;
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}
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up_write(&crypto_alg_sem);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_init_spawn);
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void crypto_drop_spawn(struct crypto_spawn *spawn)
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{
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down_write(&crypto_alg_sem);
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list_del(&spawn->list);
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up_write(&crypto_alg_sem);
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}
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EXPORT_SYMBOL_GPL(crypto_drop_spawn);
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struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
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u32 mask)
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{
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struct crypto_alg *alg;
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struct crypto_alg *alg2;
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struct crypto_tfm *tfm;
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down_read(&crypto_alg_sem);
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alg = spawn->alg;
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alg2 = alg;
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if (alg2)
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alg2 = crypto_mod_get(alg2);
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up_read(&crypto_alg_sem);
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if (!alg2) {
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if (alg)
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crypto_shoot_alg(alg);
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return ERR_PTR(-EAGAIN);
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}
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tfm = ERR_PTR(-EINVAL);
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if (unlikely((alg->cra_flags ^ type) & mask))
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goto out_put_alg;
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tfm = __crypto_alloc_tfm(alg, type, mask);
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if (IS_ERR(tfm))
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goto out_put_alg;
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return tfm;
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out_put_alg:
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crypto_mod_put(alg);
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return tfm;
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}
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EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
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int crypto_register_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&crypto_chain, nb);
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}
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EXPORT_SYMBOL_GPL(crypto_register_notifier);
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int crypto_unregister_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&crypto_chain, nb);
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}
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EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
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struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
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{
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struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
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struct crypto_attr_type *algt;
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if (!rta)
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return ERR_PTR(-ENOENT);
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if (RTA_PAYLOAD(rta) < sizeof(*algt))
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return ERR_PTR(-EINVAL);
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algt = RTA_DATA(rta);
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return algt;
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}
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EXPORT_SYMBOL_GPL(crypto_get_attr_type);
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int crypto_check_attr_type(struct rtattr **tb, u32 type)
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{
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struct crypto_attr_type *algt;
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algt = crypto_get_attr_type(tb);
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if (IS_ERR(algt))
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return PTR_ERR(algt);
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if ((algt->type ^ type) & algt->mask)
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return -EINVAL;
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_check_attr_type);
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struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
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{
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struct rtattr *rta = tb[CRYPTOA_ALG - 1];
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struct crypto_attr_alg *alga;
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if (!rta)
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return ERR_PTR(-ENOENT);
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if (RTA_PAYLOAD(rta) < sizeof(*alga))
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return ERR_PTR(-EINVAL);
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alga = RTA_DATA(rta);
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alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
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return crypto_alg_mod_lookup(alga->name, type, mask);
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}
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EXPORT_SYMBOL_GPL(crypto_get_attr_alg);
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struct crypto_instance *crypto_alloc_instance(const char *name,
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struct crypto_alg *alg)
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{
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struct crypto_instance *inst;
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struct crypto_spawn *spawn;
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int err;
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inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
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if (!inst)
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return ERR_PTR(-ENOMEM);
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err = -ENAMETOOLONG;
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if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
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alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
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goto err_free_inst;
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if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
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name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
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goto err_free_inst;
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spawn = crypto_instance_ctx(inst);
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err = crypto_init_spawn(spawn, alg, inst);
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if (err)
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goto err_free_inst;
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return inst;
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err_free_inst:
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kfree(inst);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_instance);
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static int __init crypto_algapi_init(void)
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{
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crypto_init_proc();
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return 0;
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}
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static void __exit crypto_algapi_exit(void)
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{
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crypto_exit_proc();
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}
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module_init(crypto_algapi_init);
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module_exit(crypto_algapi_exit);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Cryptographic algorithms API");
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