601 lines
13 KiB
C
601 lines
13 KiB
C
/*
|
|
* Cryptographic API for algorithms (i.e., low-level API).
|
|
*
|
|
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the Free
|
|
* Software Foundation; either version 2 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/string.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static LIST_HEAD(crypto_template_list);
|
|
|
|
void crypto_larval_error(const char *name, u32 type, u32 mask)
|
|
{
|
|
struct crypto_alg *alg;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
alg = __crypto_alg_lookup(name, type, mask);
|
|
up_read(&crypto_alg_sem);
|
|
|
|
if (alg) {
|
|
if (crypto_is_larval(alg)) {
|
|
struct crypto_larval *larval = (void *)alg;
|
|
complete_all(&larval->completion);
|
|
}
|
|
crypto_mod_put(alg);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_larval_error);
|
|
|
|
static inline int crypto_set_driver_name(struct crypto_alg *alg)
|
|
{
|
|
static const char suffix[] = "-generic";
|
|
char *driver_name = alg->cra_driver_name;
|
|
int len;
|
|
|
|
if (*driver_name)
|
|
return 0;
|
|
|
|
len = strlcpy(driver_name, alg->cra_name, CRYPTO_MAX_ALG_NAME);
|
|
if (len + sizeof(suffix) > CRYPTO_MAX_ALG_NAME)
|
|
return -ENAMETOOLONG;
|
|
|
|
memcpy(driver_name + len, suffix, sizeof(suffix));
|
|
return 0;
|
|
}
|
|
|
|
static int crypto_check_alg(struct crypto_alg *alg)
|
|
{
|
|
if (alg->cra_alignmask & (alg->cra_alignmask + 1))
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_alignmask & alg->cra_blocksize)
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_blocksize > PAGE_SIZE / 8)
|
|
return -EINVAL;
|
|
|
|
if (alg->cra_priority < 0)
|
|
return -EINVAL;
|
|
|
|
return crypto_set_driver_name(alg);
|
|
}
|
|
|
|
static void crypto_destroy_instance(struct crypto_alg *alg)
|
|
{
|
|
struct crypto_instance *inst = (void *)alg;
|
|
struct crypto_template *tmpl = inst->tmpl;
|
|
|
|
tmpl->free(inst);
|
|
crypto_tmpl_put(tmpl);
|
|
}
|
|
|
|
static void crypto_remove_spawn(struct crypto_spawn *spawn,
|
|
struct list_head *list,
|
|
struct list_head *secondary_spawns)
|
|
{
|
|
struct crypto_instance *inst = spawn->inst;
|
|
struct crypto_template *tmpl = inst->tmpl;
|
|
|
|
list_del_init(&spawn->list);
|
|
spawn->alg = NULL;
|
|
|
|
if (crypto_is_dead(&inst->alg))
|
|
return;
|
|
|
|
inst->alg.cra_flags |= CRYPTO_ALG_DEAD;
|
|
if (!tmpl || !crypto_tmpl_get(tmpl))
|
|
return;
|
|
|
|
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, &inst->alg);
|
|
list_move(&inst->alg.cra_list, list);
|
|
hlist_del(&inst->list);
|
|
inst->alg.cra_destroy = crypto_destroy_instance;
|
|
|
|
list_splice(&inst->alg.cra_users, secondary_spawns);
|
|
}
|
|
|
|
static void crypto_remove_spawns(struct list_head *spawns,
|
|
struct list_head *list, u32 new_type)
|
|
{
|
|
struct crypto_spawn *spawn, *n;
|
|
LIST_HEAD(secondary_spawns);
|
|
|
|
list_for_each_entry_safe(spawn, n, spawns, list) {
|
|
if ((spawn->alg->cra_flags ^ new_type) & spawn->mask)
|
|
continue;
|
|
|
|
crypto_remove_spawn(spawn, list, &secondary_spawns);
|
|
}
|
|
|
|
while (!list_empty(&secondary_spawns)) {
|
|
list_for_each_entry_safe(spawn, n, &secondary_spawns, list)
|
|
crypto_remove_spawn(spawn, list, &secondary_spawns);
|
|
}
|
|
}
|
|
|
|
static int __crypto_register_alg(struct crypto_alg *alg,
|
|
struct list_head *list)
|
|
{
|
|
struct crypto_alg *q;
|
|
int ret = -EAGAIN;
|
|
|
|
if (crypto_is_dead(alg))
|
|
goto out;
|
|
|
|
INIT_LIST_HEAD(&alg->cra_users);
|
|
|
|
ret = -EEXIST;
|
|
|
|
atomic_set(&alg->cra_refcnt, 1);
|
|
list_for_each_entry(q, &crypto_alg_list, cra_list) {
|
|
if (q == alg)
|
|
goto out;
|
|
|
|
if (crypto_is_moribund(q))
|
|
continue;
|
|
|
|
if (crypto_is_larval(q)) {
|
|
struct crypto_larval *larval = (void *)q;
|
|
|
|
if (strcmp(alg->cra_name, q->cra_name) &&
|
|
strcmp(alg->cra_driver_name, q->cra_name))
|
|
continue;
|
|
|
|
if (larval->adult)
|
|
continue;
|
|
if ((q->cra_flags ^ alg->cra_flags) & larval->mask)
|
|
continue;
|
|
if (!crypto_mod_get(alg))
|
|
continue;
|
|
|
|
larval->adult = alg;
|
|
complete_all(&larval->completion);
|
|
continue;
|
|
}
|
|
|
|
if (strcmp(alg->cra_name, q->cra_name))
|
|
continue;
|
|
|
|
if (strcmp(alg->cra_driver_name, q->cra_driver_name) &&
|
|
q->cra_priority > alg->cra_priority)
|
|
continue;
|
|
|
|
crypto_remove_spawns(&q->cra_users, list, alg->cra_flags);
|
|
}
|
|
|
|
list_add(&alg->cra_list, &crypto_alg_list);
|
|
|
|
crypto_notify(CRYPTO_MSG_ALG_REGISTER, alg);
|
|
ret = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void crypto_remove_final(struct list_head *list)
|
|
{
|
|
struct crypto_alg *alg;
|
|
struct crypto_alg *n;
|
|
|
|
list_for_each_entry_safe(alg, n, list, cra_list) {
|
|
list_del_init(&alg->cra_list);
|
|
crypto_alg_put(alg);
|
|
}
|
|
}
|
|
|
|
int crypto_register_alg(struct crypto_alg *alg)
|
|
{
|
|
LIST_HEAD(list);
|
|
int err;
|
|
|
|
err = crypto_check_alg(alg);
|
|
if (err)
|
|
return err;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
err = __crypto_register_alg(alg, &list);
|
|
up_write(&crypto_alg_sem);
|
|
|
|
crypto_remove_final(&list);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_alg);
|
|
|
|
static int crypto_remove_alg(struct crypto_alg *alg, struct list_head *list)
|
|
{
|
|
if (unlikely(list_empty(&alg->cra_list)))
|
|
return -ENOENT;
|
|
|
|
alg->cra_flags |= CRYPTO_ALG_DEAD;
|
|
|
|
crypto_notify(CRYPTO_MSG_ALG_UNREGISTER, alg);
|
|
list_del_init(&alg->cra_list);
|
|
crypto_remove_spawns(&alg->cra_users, list, alg->cra_flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int crypto_unregister_alg(struct crypto_alg *alg)
|
|
{
|
|
int ret;
|
|
LIST_HEAD(list);
|
|
|
|
down_write(&crypto_alg_sem);
|
|
ret = crypto_remove_alg(alg, &list);
|
|
up_write(&crypto_alg_sem);
|
|
|
|
if (ret)
|
|
return ret;
|
|
|
|
BUG_ON(atomic_read(&alg->cra_refcnt) != 1);
|
|
if (alg->cra_destroy)
|
|
alg->cra_destroy(alg);
|
|
|
|
crypto_remove_final(&list);
|
|
return 0;
|
|
}
|
|
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);
|
|
crypto_notify(CRYPTO_MSG_TMPL_REGISTER, tmpl);
|
|
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;
|
|
LIST_HEAD(users);
|
|
|
|
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) {
|
|
int err = crypto_remove_alg(&inst->alg, &users);
|
|
BUG_ON(err);
|
|
}
|
|
|
|
crypto_notify(CRYPTO_MSG_TMPL_UNREGISTER, tmpl);
|
|
|
|
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);
|
|
}
|
|
crypto_remove_final(&users);
|
|
}
|
|
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)
|
|
{
|
|
LIST_HEAD(list);
|
|
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, &list);
|
|
if (err)
|
|
goto unlock;
|
|
|
|
hlist_add_head(&inst->list, &tmpl->instances);
|
|
inst->tmpl = tmpl;
|
|
|
|
unlock:
|
|
up_write(&crypto_alg_sem);
|
|
|
|
crypto_remove_final(&list);
|
|
|
|
err:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_instance);
|
|
|
|
int crypto_init_spawn(struct crypto_spawn *spawn, struct crypto_alg *alg,
|
|
struct crypto_instance *inst, u32 mask)
|
|
{
|
|
int err = -EAGAIN;
|
|
|
|
spawn->inst = inst;
|
|
spawn->mask = mask;
|
|
|
|
down_write(&crypto_alg_sem);
|
|
if (!crypto_is_moribund(alg)) {
|
|
list_add(&spawn->list, &alg->cra_users);
|
|
spawn->alg = alg;
|
|
err = 0;
|
|
}
|
|
up_write(&crypto_alg_sem);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_init_spawn);
|
|
|
|
void crypto_drop_spawn(struct crypto_spawn *spawn)
|
|
{
|
|
down_write(&crypto_alg_sem);
|
|
list_del(&spawn->list);
|
|
up_write(&crypto_alg_sem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_drop_spawn);
|
|
|
|
struct crypto_tfm *crypto_spawn_tfm(struct crypto_spawn *spawn, u32 type,
|
|
u32 mask)
|
|
{
|
|
struct crypto_alg *alg;
|
|
struct crypto_alg *alg2;
|
|
struct crypto_tfm *tfm;
|
|
|
|
down_read(&crypto_alg_sem);
|
|
alg = spawn->alg;
|
|
alg2 = alg;
|
|
if (alg2)
|
|
alg2 = crypto_mod_get(alg2);
|
|
up_read(&crypto_alg_sem);
|
|
|
|
if (!alg2) {
|
|
if (alg)
|
|
crypto_shoot_alg(alg);
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
|
|
tfm = ERR_PTR(-EINVAL);
|
|
if (unlikely((alg->cra_flags ^ type) & mask))
|
|
goto out_put_alg;
|
|
|
|
tfm = __crypto_alloc_tfm(alg, type, mask);
|
|
if (IS_ERR(tfm))
|
|
goto out_put_alg;
|
|
|
|
return tfm;
|
|
|
|
out_put_alg:
|
|
crypto_mod_put(alg);
|
|
return tfm;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_spawn_tfm);
|
|
|
|
int crypto_register_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_register(&crypto_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_register_notifier);
|
|
|
|
int crypto_unregister_notifier(struct notifier_block *nb)
|
|
{
|
|
return blocking_notifier_chain_unregister(&crypto_chain, nb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_notifier);
|
|
|
|
struct crypto_attr_type *crypto_get_attr_type(struct rtattr **tb)
|
|
{
|
|
struct rtattr *rta = tb[CRYPTOA_TYPE - 1];
|
|
struct crypto_attr_type *algt;
|
|
|
|
if (!rta)
|
|
return ERR_PTR(-ENOENT);
|
|
if (RTA_PAYLOAD(rta) < sizeof(*algt))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
algt = RTA_DATA(rta);
|
|
|
|
return algt;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_get_attr_type);
|
|
|
|
int crypto_check_attr_type(struct rtattr **tb, u32 type)
|
|
{
|
|
struct crypto_attr_type *algt;
|
|
|
|
algt = crypto_get_attr_type(tb);
|
|
if (IS_ERR(algt))
|
|
return PTR_ERR(algt);
|
|
|
|
if ((algt->type ^ type) & algt->mask)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_check_attr_type);
|
|
|
|
struct crypto_alg *crypto_get_attr_alg(struct rtattr **tb, u32 type, u32 mask)
|
|
{
|
|
struct rtattr *rta = tb[CRYPTOA_ALG - 1];
|
|
struct crypto_attr_alg *alga;
|
|
|
|
if (!rta)
|
|
return ERR_PTR(-ENOENT);
|
|
if (RTA_PAYLOAD(rta) < sizeof(*alga))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
alga = RTA_DATA(rta);
|
|
alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
|
|
|
|
return crypto_alg_mod_lookup(alga->name, type, mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_get_attr_alg);
|
|
|
|
struct crypto_instance *crypto_alloc_instance(const char *name,
|
|
struct crypto_alg *alg)
|
|
{
|
|
struct crypto_instance *inst;
|
|
struct crypto_spawn *spawn;
|
|
int err;
|
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
|
|
if (!inst)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
err = -ENAMETOOLONG;
|
|
if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, "%s(%s)", name,
|
|
alg->cra_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
|
|
name, alg->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
|
|
goto err_free_inst;
|
|
|
|
spawn = crypto_instance_ctx(inst);
|
|
err = crypto_init_spawn(spawn, alg, inst,
|
|
CRYPTO_ALG_TYPE_MASK | CRYPTO_ALG_ASYNC);
|
|
|
|
if (err)
|
|
goto err_free_inst;
|
|
|
|
return inst;
|
|
|
|
err_free_inst:
|
|
kfree(inst);
|
|
return ERR_PTR(err);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_instance);
|
|
|
|
void crypto_init_queue(struct crypto_queue *queue, unsigned int max_qlen)
|
|
{
|
|
INIT_LIST_HEAD(&queue->list);
|
|
queue->backlog = &queue->list;
|
|
queue->qlen = 0;
|
|
queue->max_qlen = max_qlen;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_init_queue);
|
|
|
|
int crypto_enqueue_request(struct crypto_queue *queue,
|
|
struct crypto_async_request *request)
|
|
{
|
|
int err = -EINPROGRESS;
|
|
|
|
if (unlikely(queue->qlen >= queue->max_qlen)) {
|
|
err = -EBUSY;
|
|
if (!(request->flags & CRYPTO_TFM_REQ_MAY_BACKLOG))
|
|
goto out;
|
|
if (queue->backlog == &queue->list)
|
|
queue->backlog = &request->list;
|
|
}
|
|
|
|
queue->qlen++;
|
|
list_add_tail(&request->list, &queue->list);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_enqueue_request);
|
|
|
|
struct crypto_async_request *crypto_dequeue_request(struct crypto_queue *queue)
|
|
{
|
|
struct list_head *request;
|
|
|
|
if (unlikely(!queue->qlen))
|
|
return NULL;
|
|
|
|
queue->qlen--;
|
|
|
|
if (queue->backlog != &queue->list)
|
|
queue->backlog = queue->backlog->next;
|
|
|
|
request = queue->list.next;
|
|
list_del(request);
|
|
|
|
return list_entry(request, struct crypto_async_request, list);
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_dequeue_request);
|
|
|
|
int crypto_tfm_in_queue(struct crypto_queue *queue, struct crypto_tfm *tfm)
|
|
{
|
|
struct crypto_async_request *req;
|
|
|
|
list_for_each_entry(req, &queue->list, list) {
|
|
if (req->tfm == tfm)
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(crypto_tfm_in_queue);
|
|
|
|
static int __init crypto_algapi_init(void)
|
|
{
|
|
crypto_init_proc();
|
|
return 0;
|
|
}
|
|
|
|
static void __exit crypto_algapi_exit(void)
|
|
{
|
|
crypto_exit_proc();
|
|
}
|
|
|
|
module_init(crypto_algapi_init);
|
|
module_exit(crypto_algapi_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Cryptographic algorithms API");
|