495 строки
9.8 KiB
C
495 строки
9.8 KiB
C
/*
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* af_alg: User-space algorithm interface
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*
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* This file provides the user-space API for algorithms.
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*
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* Copyright (c) 2010 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/atomic.h>
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#include <crypto/if_alg.h>
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#include <linux/crypto.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/net.h>
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#include <linux/rwsem.h>
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#include <linux/security.h>
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struct alg_type_list {
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const struct af_alg_type *type;
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struct list_head list;
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};
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static atomic_long_t alg_memory_allocated;
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static struct proto alg_proto = {
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.name = "ALG",
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.owner = THIS_MODULE,
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.memory_allocated = &alg_memory_allocated,
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.obj_size = sizeof(struct alg_sock),
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};
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static LIST_HEAD(alg_types);
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static DECLARE_RWSEM(alg_types_sem);
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static const struct af_alg_type *alg_get_type(const char *name)
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{
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const struct af_alg_type *type = ERR_PTR(-ENOENT);
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struct alg_type_list *node;
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down_read(&alg_types_sem);
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list_for_each_entry(node, &alg_types, list) {
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if (strcmp(node->type->name, name))
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continue;
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if (try_module_get(node->type->owner))
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type = node->type;
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break;
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}
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up_read(&alg_types_sem);
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return type;
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}
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int af_alg_register_type(const struct af_alg_type *type)
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{
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struct alg_type_list *node;
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int err = -EEXIST;
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down_write(&alg_types_sem);
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list_for_each_entry(node, &alg_types, list) {
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if (!strcmp(node->type->name, type->name))
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goto unlock;
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}
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node = kmalloc(sizeof(*node), GFP_KERNEL);
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err = -ENOMEM;
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if (!node)
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goto unlock;
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type->ops->owner = THIS_MODULE;
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node->type = type;
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list_add(&node->list, &alg_types);
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err = 0;
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unlock:
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up_write(&alg_types_sem);
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return err;
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}
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EXPORT_SYMBOL_GPL(af_alg_register_type);
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int af_alg_unregister_type(const struct af_alg_type *type)
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{
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struct alg_type_list *node;
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int err = -ENOENT;
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down_write(&alg_types_sem);
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list_for_each_entry(node, &alg_types, list) {
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if (strcmp(node->type->name, type->name))
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continue;
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list_del(&node->list);
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kfree(node);
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err = 0;
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break;
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}
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up_write(&alg_types_sem);
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return err;
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}
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EXPORT_SYMBOL_GPL(af_alg_unregister_type);
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static void alg_do_release(const struct af_alg_type *type, void *private)
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{
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if (!type)
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return;
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type->release(private);
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module_put(type->owner);
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}
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int af_alg_release(struct socket *sock)
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{
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if (sock->sk)
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sock_put(sock->sk);
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return 0;
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}
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EXPORT_SYMBOL_GPL(af_alg_release);
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static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
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{
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const u32 forbidden = CRYPTO_ALG_INTERNAL;
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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struct sockaddr_alg *sa = (void *)uaddr;
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const struct af_alg_type *type;
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void *private;
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if (sock->state == SS_CONNECTED)
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return -EINVAL;
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if (addr_len != sizeof(*sa))
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return -EINVAL;
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sa->salg_type[sizeof(sa->salg_type) - 1] = 0;
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sa->salg_name[sizeof(sa->salg_name) - 1] = 0;
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type = alg_get_type(sa->salg_type);
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if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) {
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request_module("algif-%s", sa->salg_type);
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type = alg_get_type(sa->salg_type);
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}
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if (IS_ERR(type))
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return PTR_ERR(type);
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private = type->bind(sa->salg_name,
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sa->salg_feat & ~forbidden,
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sa->salg_mask & ~forbidden);
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if (IS_ERR(private)) {
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module_put(type->owner);
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return PTR_ERR(private);
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}
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lock_sock(sk);
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swap(ask->type, type);
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swap(ask->private, private);
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release_sock(sk);
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alg_do_release(type, private);
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return 0;
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}
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static int alg_setkey(struct sock *sk, char __user *ukey,
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unsigned int keylen)
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{
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struct alg_sock *ask = alg_sk(sk);
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const struct af_alg_type *type = ask->type;
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u8 *key;
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int err;
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key = sock_kmalloc(sk, keylen, GFP_KERNEL);
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if (!key)
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return -ENOMEM;
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err = -EFAULT;
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if (copy_from_user(key, ukey, keylen))
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goto out;
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err = type->setkey(ask->private, key, keylen);
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out:
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sock_kzfree_s(sk, key, keylen);
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return err;
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}
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static int alg_setsockopt(struct socket *sock, int level, int optname,
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char __user *optval, unsigned int optlen)
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{
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struct sock *sk = sock->sk;
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struct alg_sock *ask = alg_sk(sk);
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const struct af_alg_type *type;
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int err = -ENOPROTOOPT;
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lock_sock(sk);
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type = ask->type;
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if (level != SOL_ALG || !type)
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goto unlock;
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switch (optname) {
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case ALG_SET_KEY:
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if (sock->state == SS_CONNECTED)
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goto unlock;
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if (!type->setkey)
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goto unlock;
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err = alg_setkey(sk, optval, optlen);
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break;
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case ALG_SET_AEAD_AUTHSIZE:
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if (sock->state == SS_CONNECTED)
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goto unlock;
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if (!type->setauthsize)
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goto unlock;
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err = type->setauthsize(ask->private, optlen);
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}
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unlock:
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release_sock(sk);
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return err;
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}
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int af_alg_accept(struct sock *sk, struct socket *newsock)
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{
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struct alg_sock *ask = alg_sk(sk);
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const struct af_alg_type *type;
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struct sock *sk2;
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int err;
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lock_sock(sk);
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type = ask->type;
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err = -EINVAL;
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if (!type)
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goto unlock;
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sk2 = sk_alloc(sock_net(sk), PF_ALG, GFP_KERNEL, &alg_proto);
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err = -ENOMEM;
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if (!sk2)
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goto unlock;
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sock_init_data(newsock, sk2);
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sock_graft(sk2, newsock);
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security_sk_clone(sk, sk2);
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err = type->accept(ask->private, sk2);
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if (err) {
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sk_free(sk2);
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goto unlock;
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}
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sk2->sk_family = PF_ALG;
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sock_hold(sk);
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alg_sk(sk2)->parent = sk;
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alg_sk(sk2)->type = type;
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newsock->ops = type->ops;
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newsock->state = SS_CONNECTED;
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err = 0;
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unlock:
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release_sock(sk);
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return err;
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}
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EXPORT_SYMBOL_GPL(af_alg_accept);
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static int alg_accept(struct socket *sock, struct socket *newsock, int flags)
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{
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return af_alg_accept(sock->sk, newsock);
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}
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static const struct proto_ops alg_proto_ops = {
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.family = PF_ALG,
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.owner = THIS_MODULE,
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.connect = sock_no_connect,
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.socketpair = sock_no_socketpair,
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.getname = sock_no_getname,
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.ioctl = sock_no_ioctl,
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.listen = sock_no_listen,
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.shutdown = sock_no_shutdown,
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.getsockopt = sock_no_getsockopt,
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.mmap = sock_no_mmap,
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.sendpage = sock_no_sendpage,
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.sendmsg = sock_no_sendmsg,
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.recvmsg = sock_no_recvmsg,
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.poll = sock_no_poll,
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.bind = alg_bind,
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.release = af_alg_release,
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.setsockopt = alg_setsockopt,
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.accept = alg_accept,
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};
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static void alg_sock_destruct(struct sock *sk)
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{
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struct alg_sock *ask = alg_sk(sk);
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alg_do_release(ask->type, ask->private);
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}
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static int alg_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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struct sock *sk;
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int err;
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if (sock->type != SOCK_SEQPACKET)
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return -ESOCKTNOSUPPORT;
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if (protocol != 0)
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return -EPROTONOSUPPORT;
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err = -ENOMEM;
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sk = sk_alloc(net, PF_ALG, GFP_KERNEL, &alg_proto);
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if (!sk)
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goto out;
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sock->ops = &alg_proto_ops;
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sock_init_data(sock, sk);
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sk->sk_family = PF_ALG;
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sk->sk_destruct = alg_sock_destruct;
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return 0;
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out:
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return err;
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}
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static const struct net_proto_family alg_family = {
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.family = PF_ALG,
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.create = alg_create,
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.owner = THIS_MODULE,
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};
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int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len)
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{
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size_t off;
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ssize_t n;
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int npages, i;
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n = iov_iter_get_pages(iter, sgl->pages, len, ALG_MAX_PAGES, &off);
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if (n < 0)
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return n;
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npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;
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if (WARN_ON(npages == 0))
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return -EINVAL;
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/* Add one extra for linking */
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sg_init_table(sgl->sg, npages + 1);
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for (i = 0, len = n; i < npages; i++) {
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int plen = min_t(int, len, PAGE_SIZE - off);
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sg_set_page(sgl->sg + i, sgl->pages[i], plen, off);
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off = 0;
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len -= plen;
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}
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sg_mark_end(sgl->sg + npages - 1);
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sgl->npages = npages;
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return n;
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}
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EXPORT_SYMBOL_GPL(af_alg_make_sg);
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void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)
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{
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sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);
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sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);
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}
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EXPORT_SYMBOL_GPL(af_alg_link_sg);
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void af_alg_free_sg(struct af_alg_sgl *sgl)
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{
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int i;
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for (i = 0; i < sgl->npages; i++)
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put_page(sgl->pages[i]);
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}
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EXPORT_SYMBOL_GPL(af_alg_free_sg);
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int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con)
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{
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struct cmsghdr *cmsg;
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for_each_cmsghdr(cmsg, msg) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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if (cmsg->cmsg_level != SOL_ALG)
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continue;
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switch (cmsg->cmsg_type) {
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case ALG_SET_IV:
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*con->iv)))
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return -EINVAL;
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con->iv = (void *)CMSG_DATA(cmsg);
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if (cmsg->cmsg_len < CMSG_LEN(con->iv->ivlen +
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sizeof(*con->iv)))
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return -EINVAL;
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break;
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case ALG_SET_OP:
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
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return -EINVAL;
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con->op = *(u32 *)CMSG_DATA(cmsg);
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break;
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case ALG_SET_AEAD_ASSOCLEN:
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(u32)))
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return -EINVAL;
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con->aead_assoclen = *(u32 *)CMSG_DATA(cmsg);
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break;
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(af_alg_cmsg_send);
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int af_alg_wait_for_completion(int err, struct af_alg_completion *completion)
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{
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switch (err) {
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case -EINPROGRESS:
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case -EBUSY:
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wait_for_completion(&completion->completion);
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reinit_completion(&completion->completion);
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err = completion->err;
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break;
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};
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return err;
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}
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EXPORT_SYMBOL_GPL(af_alg_wait_for_completion);
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void af_alg_complete(struct crypto_async_request *req, int err)
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{
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struct af_alg_completion *completion = req->data;
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if (err == -EINPROGRESS)
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return;
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completion->err = err;
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complete(&completion->completion);
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}
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EXPORT_SYMBOL_GPL(af_alg_complete);
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static int __init af_alg_init(void)
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{
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int err = proto_register(&alg_proto, 0);
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if (err)
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goto out;
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err = sock_register(&alg_family);
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if (err != 0)
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goto out_unregister_proto;
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out:
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return err;
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out_unregister_proto:
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proto_unregister(&alg_proto);
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goto out;
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}
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static void __exit af_alg_exit(void)
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{
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sock_unregister(PF_ALG);
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proto_unregister(&alg_proto);
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}
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module_init(af_alg_init);
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module_exit(af_alg_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NETPROTO(AF_ALG);
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