*
*/
+#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 void crypto_remove_final(struct list_head *list);
+
+static LIST_HEAD(crypto_template_list);
+
+void crypto_larval_error(const char *name, u32 type, u32 mask)
+{
+ struct crypto_alg *alg;
+
+ alg = crypto_alg_lookup(name, type, mask);
+
+ 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";
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;
- 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;
-
- ret = crypto_set_driver_name(alg);
- if (unlikely(ret))
- return ret;
- down_write(&crypto_alg_sem);
-
+ 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 (hlist_unhashed(&inst->list))
+ return;
+
+ 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 struct crypto_larval *__crypto_register_alg(struct crypto_alg *alg)
+{
+ struct crypto_alg *q;
+ struct crypto_larval *larval;
+ int ret = -EAGAIN;
+
+ if (crypto_is_dead(alg))
+ goto err;
+
+ INIT_LIST_HEAD(&alg->cra_users);
+
+ /* No cheating! */
+ alg->cra_flags &= ~CRYPTO_ALG_TESTED;
+
+ ret = -EEXIST;
+
+ atomic_set(&alg->cra_refcnt, 1);
list_for_each_entry(q, &crypto_alg_list, cra_list) {
- if (q == alg) {
- ret = -EEXIST;
- goto out;
+ if (q == alg)
+ goto err;
+
+ if (crypto_is_moribund(q))
+ continue;
+
+ if (crypto_is_larval(q)) {
+ if (!strcmp(alg->cra_driver_name, q->cra_driver_name))
+ goto err;
+ continue;
}
+
+ if (!strcmp(q->cra_driver_name, alg->cra_name) ||
+ !strcmp(q->cra_name, alg->cra_driver_name))
+ goto err;
}
-
+
+ larval = crypto_larval_alloc(alg->cra_name,
+ alg->cra_flags | CRYPTO_ALG_TESTED, 0);
+ if (IS_ERR(larval))
+ goto out;
+
+ ret = -ENOENT;
+ larval->adult = crypto_mod_get(alg);
+ if (!larval->adult)
+ goto free_larval;
+
+ atomic_set(&larval->alg.cra_refcnt, 1);
+ memcpy(larval->alg.cra_driver_name, alg->cra_driver_name,
+ CRYPTO_MAX_ALG_NAME);
+ larval->alg.cra_priority = alg->cra_priority;
+
list_add(&alg->cra_list, &crypto_alg_list);
- atomic_set(&alg->cra_refcnt, 1);
+ list_add(&larval->alg.cra_list, &crypto_alg_list);
+
out:
- up_write(&crypto_alg_sem);
- return ret;
+ return larval;
+
+free_larval:
+ kfree(larval);
+err:
+ larval = ERR_PTR(ret);
+ goto out;
}
-EXPORT_SYMBOL_GPL(crypto_register_alg);
-int crypto_unregister_alg(struct crypto_alg *alg)
+void crypto_alg_tested(const char *name, int err)
{
- int ret = -ENOENT;
+ struct crypto_larval *test;
+ struct crypto_alg *alg;
struct crypto_alg *q;
-
+ LIST_HEAD(list);
+
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 (crypto_is_moribund(q) || !crypto_is_larval(q))
+ continue;
+
+ test = (struct crypto_larval *)q;
+
+ if (!strcmp(q->cra_driver_name, name))
+ goto found;
+ }
+
+ printk(KERN_ERR "alg: Unexpected test result for %s: %d\n", name, err);
+ goto unlock;
+
+found:
+ q->cra_flags |= CRYPTO_ALG_DEAD;
+ alg = test->adult;
+ if (err || list_empty(&alg->cra_list))
+ goto complete;
+
+ alg->cra_flags |= CRYPTO_ALG_TESTED;
+
+ list_for_each_entry(q, &crypto_alg_list, cra_list) {
+ if (q == alg)
+ continue;
+
+ if (crypto_is_moribund(q))
+ continue;
+
+ if (crypto_is_larval(q)) {
+ struct crypto_larval *larval = (void *)q;
+
+ /*
+ * Check to see if either our generic name or
+ * specific name can satisfy the name requested
+ * by the larval entry 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);
}
-out:
+
+complete:
+ complete_all(&test->completion);
+
+unlock:
+ up_write(&crypto_alg_sem);
+
+ crypto_remove_final(&list);
+}
+EXPORT_SYMBOL_GPL(crypto_alg_tested);
+
+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);
+ }
+}
+
+static void crypto_wait_for_test(struct crypto_larval *larval)
+{
+ int err;
+
+ err = crypto_probing_notify(CRYPTO_MSG_ALG_REGISTER, larval->adult);
+ if (err != NOTIFY_STOP) {
+ if (WARN_ON(err != NOTIFY_DONE))
+ goto out;
+ crypto_alg_tested(larval->alg.cra_driver_name, 0);
+ }
+
+ err = wait_for_completion_interruptible(&larval->completion);
+ WARN_ON(err);
+
+out:
+ crypto_larval_kill(&larval->alg);
+}
+
+int crypto_register_alg(struct crypto_alg *alg)
+{
+ struct crypto_larval *larval;
+ int err;
+
+ err = crypto_check_alg(alg);
+ if (err)
+ return err;
+
+ down_write(&crypto_alg_sem);
+ larval = __crypto_register_alg(alg);
+ up_write(&crypto_alg_sem);
+
+ if (IS_ERR(larval))
+ return PTR_ERR(larval);
+
+ crypto_wait_for_test(larval);
+ return 0;
+}
+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)
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)
+{
+ struct crypto_larval *larval;
+ int err;
+
+ err = crypto_check_alg(&inst->alg);
+ if (err)
+ goto err;
+
+ inst->alg.cra_module = tmpl->module;
+
+ down_write(&crypto_alg_sem);
+
+ larval = __crypto_register_alg(&inst->alg);
+ if (IS_ERR(larval))
+ goto unlock;
+
+ hlist_add_head(&inst->list, &tmpl->instances);
+ inst->tmpl = tmpl;
+
+unlock:
+ up_write(&crypto_alg_sem);
+
+ err = PTR_ERR(larval);
+ if (IS_ERR(larval))
+ goto err;
+
+ crypto_wait_for_test(larval);
+ err = 0;
+
+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[0];
+ struct crypto_attr_type *algt;
+
+ if (!rta)
+ return ERR_PTR(-ENOENT);
+ if (RTA_PAYLOAD(rta) < sizeof(*algt))
+ return ERR_PTR(-EINVAL);
+ if (rta->rta_type != CRYPTOA_TYPE)
+ 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);
+
+const char *crypto_attr_alg_name(struct rtattr *rta)
+{
+ struct crypto_attr_alg *alga;
+
+ if (!rta)
+ return ERR_PTR(-ENOENT);
+ if (RTA_PAYLOAD(rta) < sizeof(*alga))
+ return ERR_PTR(-EINVAL);
+ if (rta->rta_type != CRYPTOA_ALG)
+ return ERR_PTR(-EINVAL);
+
+ alga = RTA_DATA(rta);
+ alga->name[CRYPTO_MAX_ALG_NAME - 1] = 0;
+
+ return alga->name;
+}
+EXPORT_SYMBOL_GPL(crypto_attr_alg_name);
+
+struct crypto_alg *crypto_attr_alg(struct rtattr *rta, u32 type, u32 mask)
+{
+ const char *name;
+ int err;
+
+ name = crypto_attr_alg_name(rta);
+ err = PTR_ERR(name);
+ if (IS_ERR(name))
+ return ERR_PTR(err);
+
+ return crypto_alg_mod_lookup(name, type, mask);
+}
+EXPORT_SYMBOL_GPL(crypto_attr_alg);
+
+int crypto_attr_u32(struct rtattr *rta, u32 *num)
+{
+ struct crypto_attr_u32 *nu32;
+
+ if (!rta)
+ return -ENOENT;
+ if (RTA_PAYLOAD(rta) < sizeof(*nu32))
+ return -EINVAL;
+ if (rta->rta_type != CRYPTOA_U32)
+ return -EINVAL;
+
+ nu32 = RTA_DATA(rta);
+ *num = nu32->num;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(crypto_attr_u32);
+
+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 inline void crypto_inc_byte(u8 *a, unsigned int size)
+{
+ u8 *b = (a + size);
+ u8 c;
+
+ for (; size; size--) {
+ c = *--b + 1;
+ *b = c;
+ if (c)
+ break;
+ }
+}
+
+void crypto_inc(u8 *a, unsigned int size)
+{
+ __be32 *b = (__be32 *)(a + size);
+ u32 c;
+
+ for (; size >= 4; size -= 4) {
+ c = be32_to_cpu(*--b) + 1;
+ *b = cpu_to_be32(c);
+ if (c)
+ return;
+ }
+
+ crypto_inc_byte(a, size);
+}
+EXPORT_SYMBOL_GPL(crypto_inc);
+
+static inline void crypto_xor_byte(u8 *a, const u8 *b, unsigned int size)
+{
+ for (; size; size--)
+ *a++ ^= *b++;
+}
+
+void crypto_xor(u8 *dst, const u8 *src, unsigned int size)
+{
+ u32 *a = (u32 *)dst;
+ u32 *b = (u32 *)src;
+
+ for (; size >= 4; size -= 4)
+ *a++ ^= *b++;
+
+ crypto_xor_byte((u8 *)a, (u8 *)b, size);
+}
+EXPORT_SYMBOL_GPL(crypto_xor);
+
static int __init crypto_algapi_init(void)
{
crypto_init_proc();
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff