496 lines
10 KiB
C
496 lines
10 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_alg *crypto_get_attr_alg(void *param, unsigned int len,
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u32 type, u32 mask)
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{
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struct rtattr *rta = param;
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struct crypto_attr_alg *alga;
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if (!RTA_OK(rta, len))
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return ERR_PTR(-EBADR);
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if (rta->rta_type != CRYPTOA_ALG || 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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