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1229 lines
27 KiB
1229 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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 <[email protected]> |
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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/sched.h> |
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#include <linux/sched/signal.h> |
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#include <linux/security.h> |
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|
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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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|
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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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.obj_size = sizeof(struct alg_sock), |
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}; |
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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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|
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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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|
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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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|
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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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|
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return type; |
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} |
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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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|
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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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|
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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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|
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type->ops->owner = THIS_MODULE; |
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if (type->ops_nokey) |
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type->ops_nokey->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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|
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unlock: |
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up_write(&alg_types_sem); |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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type->release(private); |
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module_put(type->owner); |
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} |
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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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sock->sk = NULL; |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(af_alg_release); |
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|
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void af_alg_release_parent(struct sock *sk) |
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{ |
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struct alg_sock *ask = alg_sk(sk); |
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unsigned int nokey = atomic_read(&ask->nokey_refcnt); |
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|
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sk = ask->parent; |
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ask = alg_sk(sk); |
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|
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if (nokey) |
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atomic_dec(&ask->nokey_refcnt); |
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|
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if (atomic_dec_and_test(&ask->refcnt)) |
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sock_put(sk); |
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} |
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EXPORT_SYMBOL_GPL(af_alg_release_parent); |
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|
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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 allowed = CRYPTO_ALG_KERN_DRIVER_ONLY; |
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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_new *sa = (void *)uaddr; |
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const struct af_alg_type *type; |
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void *private; |
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int err; |
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|
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if (sock->state == SS_CONNECTED) |
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return -EINVAL; |
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|
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BUILD_BUG_ON(offsetof(struct sockaddr_alg_new, salg_name) != |
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offsetof(struct sockaddr_alg, salg_name)); |
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BUILD_BUG_ON(offsetof(struct sockaddr_alg, salg_name) != sizeof(*sa)); |
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|
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if (addr_len < sizeof(*sa) + 1) |
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return -EINVAL; |
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|
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/* If caller uses non-allowed flag, return error. */ |
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if ((sa->salg_feat & ~allowed) || (sa->salg_mask & ~allowed)) |
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return -EINVAL; |
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|
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sa->salg_type[sizeof(sa->salg_type) - 1] = 0; |
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sa->salg_name[addr_len - sizeof(*sa) - 1] = 0; |
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|
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type = alg_get_type(sa->salg_type); |
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if (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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|
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if (IS_ERR(type)) |
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return PTR_ERR(type); |
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|
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private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); |
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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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err = -EBUSY; |
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lock_sock(sk); |
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if (atomic_read(&ask->refcnt)) |
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goto unlock; |
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|
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swap(ask->type, type); |
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swap(ask->private, private); |
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|
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err = 0; |
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|
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unlock: |
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release_sock(sk); |
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|
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alg_do_release(type, private); |
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|
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return err; |
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} |
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|
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static int alg_setkey(struct sock *sk, sockptr_t ukey, 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_sockptr(key, ukey, keylen)) |
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goto out; |
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|
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err = type->setkey(ask->private, key, keylen); |
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|
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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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|
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static int alg_setsockopt(struct socket *sock, int level, int optname, |
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sockptr_t 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 = -EBUSY; |
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|
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lock_sock(sk); |
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if (atomic_read(&ask->refcnt) != atomic_read(&ask->nokey_refcnt)) |
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goto unlock; |
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type = ask->type; |
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|
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err = -ENOPROTOOPT; |
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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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|
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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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break; |
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case ALG_SET_DRBG_ENTROPY: |
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if (sock->state == SS_CONNECTED) |
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goto unlock; |
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if (!type->setentropy) |
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goto unlock; |
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|
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err = type->setentropy(ask->private, optval, optlen); |
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} |
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unlock: |
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release_sock(sk); |
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|
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return err; |
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} |
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int af_alg_accept(struct sock *sk, struct socket *newsock, bool kern) |
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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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unsigned int nokey; |
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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, kern); |
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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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security_sock_graft(sk2, newsock); |
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security_sk_clone(sk, sk2); |
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|
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/* |
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* newsock->ops assigned here to allow type->accept call to override |
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* them when required. |
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*/ |
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newsock->ops = type->ops; |
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err = type->accept(ask->private, sk2); |
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nokey = err == -ENOKEY; |
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if (nokey && type->accept_nokey) |
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err = type->accept_nokey(ask->private, sk2); |
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if (err) |
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goto unlock; |
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if (atomic_inc_return_relaxed(&ask->refcnt) == 1) |
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sock_hold(sk); |
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if (nokey) { |
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atomic_inc(&ask->nokey_refcnt); |
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atomic_set(&alg_sk(sk2)->nokey_refcnt, 1); |
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} |
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alg_sk(sk2)->parent = sk; |
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alg_sk(sk2)->type = type; |
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newsock->state = SS_CONNECTED; |
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if (nokey) |
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newsock->ops = type->ops_nokey; |
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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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bool kern) |
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{ |
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return af_alg_accept(sock->sk, newsock, kern); |
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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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|
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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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.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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.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, kern); |
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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_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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|
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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_pages2(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 = DIV_ROUND_UP(off + n, PAGE_SIZE); |
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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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|
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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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|
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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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|
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static void af_alg_link_sg(struct af_alg_sgl *sgl_prev, |
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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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void af_alg_free_sg(struct af_alg_sgl *sgl) |
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{ |
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int i; |
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|
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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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|
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static 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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|
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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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/** |
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* af_alg_alloc_tsgl - allocate the TX SGL |
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* |
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* @sk: socket of connection to user space |
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* Return: 0 upon success, < 0 upon error |
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*/ |
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static int af_alg_alloc_tsgl(struct sock *sk) |
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{ |
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struct alg_sock *ask = alg_sk(sk); |
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struct af_alg_ctx *ctx = ask->private; |
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struct af_alg_tsgl *sgl; |
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struct scatterlist *sg = NULL; |
|
|
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sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); |
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if (!list_empty(&ctx->tsgl_list)) |
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sg = sgl->sg; |
|
|
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if (!sg || sgl->cur >= MAX_SGL_ENTS) { |
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sgl = sock_kmalloc(sk, |
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struct_size(sgl, sg, (MAX_SGL_ENTS + 1)), |
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GFP_KERNEL); |
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if (!sgl) |
|
return -ENOMEM; |
|
|
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sg_init_table(sgl->sg, MAX_SGL_ENTS + 1); |
|
sgl->cur = 0; |
|
|
|
if (sg) |
|
sg_chain(sg, MAX_SGL_ENTS + 1, sgl->sg); |
|
|
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list_add_tail(&sgl->list, &ctx->tsgl_list); |
|
} |
|
|
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return 0; |
|
} |
|
|
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/** |
|
* af_alg_count_tsgl - Count number of TX SG entries |
|
* |
|
* The counting starts from the beginning of the SGL to @bytes. If |
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* an @offset is provided, the counting of the SG entries starts at the @offset. |
|
* |
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* @sk: socket of connection to user space |
|
* @bytes: Count the number of SG entries holding given number of bytes. |
|
* @offset: Start the counting of SG entries from the given offset. |
|
* Return: Number of TX SG entries found given the constraints |
|
*/ |
|
unsigned int af_alg_count_tsgl(struct sock *sk, size_t bytes, size_t offset) |
|
{ |
|
const struct alg_sock *ask = alg_sk(sk); |
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const struct af_alg_ctx *ctx = ask->private; |
|
const struct af_alg_tsgl *sgl; |
|
unsigned int i; |
|
unsigned int sgl_count = 0; |
|
|
|
if (!bytes) |
|
return 0; |
|
|
|
list_for_each_entry(sgl, &ctx->tsgl_list, list) { |
|
const struct scatterlist *sg = sgl->sg; |
|
|
|
for (i = 0; i < sgl->cur; i++) { |
|
size_t bytes_count; |
|
|
|
/* Skip offset */ |
|
if (offset >= sg[i].length) { |
|
offset -= sg[i].length; |
|
bytes -= sg[i].length; |
|
continue; |
|
} |
|
|
|
bytes_count = sg[i].length - offset; |
|
|
|
offset = 0; |
|
sgl_count++; |
|
|
|
/* If we have seen requested number of bytes, stop */ |
|
if (bytes_count >= bytes) |
|
return sgl_count; |
|
|
|
bytes -= bytes_count; |
|
} |
|
} |
|
|
|
return sgl_count; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_count_tsgl); |
|
|
|
/** |
|
* af_alg_pull_tsgl - Release the specified buffers from TX SGL |
|
* |
|
* If @dst is non-null, reassign the pages to @dst. The caller must release |
|
* the pages. If @dst_offset is given only reassign the pages to @dst starting |
|
* at the @dst_offset (byte). The caller must ensure that @dst is large |
|
* enough (e.g. by using af_alg_count_tsgl with the same offset). |
|
* |
|
* @sk: socket of connection to user space |
|
* @used: Number of bytes to pull from TX SGL |
|
* @dst: If non-NULL, buffer is reassigned to dst SGL instead of releasing. The |
|
* caller must release the buffers in dst. |
|
* @dst_offset: Reassign the TX SGL from given offset. All buffers before |
|
* reaching the offset is released. |
|
*/ |
|
void af_alg_pull_tsgl(struct sock *sk, size_t used, struct scatterlist *dst, |
|
size_t dst_offset) |
|
{ |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
struct af_alg_tsgl *sgl; |
|
struct scatterlist *sg; |
|
unsigned int i, j = 0; |
|
|
|
while (!list_empty(&ctx->tsgl_list)) { |
|
sgl = list_first_entry(&ctx->tsgl_list, struct af_alg_tsgl, |
|
list); |
|
sg = sgl->sg; |
|
|
|
for (i = 0; i < sgl->cur; i++) { |
|
size_t plen = min_t(size_t, used, sg[i].length); |
|
struct page *page = sg_page(sg + i); |
|
|
|
if (!page) |
|
continue; |
|
|
|
/* |
|
* Assumption: caller created af_alg_count_tsgl(len) |
|
* SG entries in dst. |
|
*/ |
|
if (dst) { |
|
if (dst_offset >= plen) { |
|
/* discard page before offset */ |
|
dst_offset -= plen; |
|
} else { |
|
/* reassign page to dst after offset */ |
|
get_page(page); |
|
sg_set_page(dst + j, page, |
|
plen - dst_offset, |
|
sg[i].offset + dst_offset); |
|
dst_offset = 0; |
|
j++; |
|
} |
|
} |
|
|
|
sg[i].length -= plen; |
|
sg[i].offset += plen; |
|
|
|
used -= plen; |
|
ctx->used -= plen; |
|
|
|
if (sg[i].length) |
|
return; |
|
|
|
put_page(page); |
|
sg_assign_page(sg + i, NULL); |
|
} |
|
|
|
list_del(&sgl->list); |
|
sock_kfree_s(sk, sgl, struct_size(sgl, sg, MAX_SGL_ENTS + 1)); |
|
} |
|
|
|
if (!ctx->used) |
|
ctx->merge = 0; |
|
ctx->init = ctx->more; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_pull_tsgl); |
|
|
|
/** |
|
* af_alg_free_areq_sgls - Release TX and RX SGLs of the request |
|
* |
|
* @areq: Request holding the TX and RX SGL |
|
*/ |
|
static void af_alg_free_areq_sgls(struct af_alg_async_req *areq) |
|
{ |
|
struct sock *sk = areq->sk; |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
struct af_alg_rsgl *rsgl, *tmp; |
|
struct scatterlist *tsgl; |
|
struct scatterlist *sg; |
|
unsigned int i; |
|
|
|
list_for_each_entry_safe(rsgl, tmp, &areq->rsgl_list, list) { |
|
atomic_sub(rsgl->sg_num_bytes, &ctx->rcvused); |
|
af_alg_free_sg(&rsgl->sgl); |
|
list_del(&rsgl->list); |
|
if (rsgl != &areq->first_rsgl) |
|
sock_kfree_s(sk, rsgl, sizeof(*rsgl)); |
|
} |
|
|
|
tsgl = areq->tsgl; |
|
if (tsgl) { |
|
for_each_sg(tsgl, sg, areq->tsgl_entries, i) { |
|
if (!sg_page(sg)) |
|
continue; |
|
put_page(sg_page(sg)); |
|
} |
|
|
|
sock_kfree_s(sk, tsgl, areq->tsgl_entries * sizeof(*tsgl)); |
|
} |
|
} |
|
|
|
/** |
|
* af_alg_wait_for_wmem - wait for availability of writable memory |
|
* |
|
* @sk: socket of connection to user space |
|
* @flags: If MSG_DONTWAIT is set, then only report if function would sleep |
|
* Return: 0 when writable memory is available, < 0 upon error |
|
*/ |
|
static int af_alg_wait_for_wmem(struct sock *sk, unsigned int flags) |
|
{ |
|
DEFINE_WAIT_FUNC(wait, woken_wake_function); |
|
int err = -ERESTARTSYS; |
|
long timeout; |
|
|
|
if (flags & MSG_DONTWAIT) |
|
return -EAGAIN; |
|
|
|
sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
|
|
|
add_wait_queue(sk_sleep(sk), &wait); |
|
for (;;) { |
|
if (signal_pending(current)) |
|
break; |
|
timeout = MAX_SCHEDULE_TIMEOUT; |
|
if (sk_wait_event(sk, &timeout, af_alg_writable(sk), &wait)) { |
|
err = 0; |
|
break; |
|
} |
|
} |
|
remove_wait_queue(sk_sleep(sk), &wait); |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* af_alg_wmem_wakeup - wakeup caller when writable memory is available |
|
* |
|
* @sk: socket of connection to user space |
|
*/ |
|
void af_alg_wmem_wakeup(struct sock *sk) |
|
{ |
|
struct socket_wq *wq; |
|
|
|
if (!af_alg_writable(sk)) |
|
return; |
|
|
|
rcu_read_lock(); |
|
wq = rcu_dereference(sk->sk_wq); |
|
if (skwq_has_sleeper(wq)) |
|
wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | |
|
EPOLLRDNORM | |
|
EPOLLRDBAND); |
|
sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
|
rcu_read_unlock(); |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_wmem_wakeup); |
|
|
|
/** |
|
* af_alg_wait_for_data - wait for availability of TX data |
|
* |
|
* @sk: socket of connection to user space |
|
* @flags: If MSG_DONTWAIT is set, then only report if function would sleep |
|
* @min: Set to minimum request size if partial requests are allowed. |
|
* Return: 0 when writable memory is available, < 0 upon error |
|
*/ |
|
int af_alg_wait_for_data(struct sock *sk, unsigned flags, unsigned min) |
|
{ |
|
DEFINE_WAIT_FUNC(wait, woken_wake_function); |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
long timeout; |
|
int err = -ERESTARTSYS; |
|
|
|
if (flags & MSG_DONTWAIT) |
|
return -EAGAIN; |
|
|
|
sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
|
|
|
add_wait_queue(sk_sleep(sk), &wait); |
|
for (;;) { |
|
if (signal_pending(current)) |
|
break; |
|
timeout = MAX_SCHEDULE_TIMEOUT; |
|
if (sk_wait_event(sk, &timeout, |
|
ctx->init && (!ctx->more || |
|
(min && ctx->used >= min)), |
|
&wait)) { |
|
err = 0; |
|
break; |
|
} |
|
} |
|
remove_wait_queue(sk_sleep(sk), &wait); |
|
|
|
sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
|
|
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_wait_for_data); |
|
|
|
/** |
|
* af_alg_data_wakeup - wakeup caller when new data can be sent to kernel |
|
* |
|
* @sk: socket of connection to user space |
|
*/ |
|
static void af_alg_data_wakeup(struct sock *sk) |
|
{ |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
struct socket_wq *wq; |
|
|
|
if (!ctx->used) |
|
return; |
|
|
|
rcu_read_lock(); |
|
wq = rcu_dereference(sk->sk_wq); |
|
if (skwq_has_sleeper(wq)) |
|
wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
|
EPOLLRDNORM | |
|
EPOLLRDBAND); |
|
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
|
rcu_read_unlock(); |
|
} |
|
|
|
/** |
|
* af_alg_sendmsg - implementation of sendmsg system call handler |
|
* |
|
* The sendmsg system call handler obtains the user data and stores it |
|
* in ctx->tsgl_list. This implies allocation of the required numbers of |
|
* struct af_alg_tsgl. |
|
* |
|
* In addition, the ctx is filled with the information sent via CMSG. |
|
* |
|
* @sock: socket of connection to user space |
|
* @msg: message from user space |
|
* @size: size of message from user space |
|
* @ivsize: the size of the IV for the cipher operation to verify that the |
|
* user-space-provided IV has the right size |
|
* Return: the number of copied data upon success, < 0 upon error |
|
*/ |
|
int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size, |
|
unsigned int ivsize) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
struct af_alg_tsgl *sgl; |
|
struct af_alg_control con = {}; |
|
long copied = 0; |
|
bool enc = false; |
|
bool init = false; |
|
int err = 0; |
|
|
|
if (msg->msg_controllen) { |
|
err = af_alg_cmsg_send(msg, &con); |
|
if (err) |
|
return err; |
|
|
|
init = true; |
|
switch (con.op) { |
|
case ALG_OP_ENCRYPT: |
|
enc = true; |
|
break; |
|
case ALG_OP_DECRYPT: |
|
enc = false; |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
if (con.iv && con.iv->ivlen != ivsize) |
|
return -EINVAL; |
|
} |
|
|
|
lock_sock(sk); |
|
if (ctx->init && !ctx->more) { |
|
if (ctx->used) { |
|
err = -EINVAL; |
|
goto unlock; |
|
} |
|
|
|
pr_info_once( |
|
"%s sent an empty control message without MSG_MORE.\n", |
|
current->comm); |
|
} |
|
ctx->init = true; |
|
|
|
if (init) { |
|
ctx->enc = enc; |
|
if (con.iv) |
|
memcpy(ctx->iv, con.iv->iv, ivsize); |
|
|
|
ctx->aead_assoclen = con.aead_assoclen; |
|
} |
|
|
|
while (size) { |
|
struct scatterlist *sg; |
|
size_t len = size; |
|
size_t plen; |
|
|
|
/* use the existing memory in an allocated page */ |
|
if (ctx->merge) { |
|
sgl = list_entry(ctx->tsgl_list.prev, |
|
struct af_alg_tsgl, list); |
|
sg = sgl->sg + sgl->cur - 1; |
|
len = min_t(size_t, len, |
|
PAGE_SIZE - sg->offset - sg->length); |
|
|
|
err = memcpy_from_msg(page_address(sg_page(sg)) + |
|
sg->offset + sg->length, |
|
msg, len); |
|
if (err) |
|
goto unlock; |
|
|
|
sg->length += len; |
|
ctx->merge = (sg->offset + sg->length) & |
|
(PAGE_SIZE - 1); |
|
|
|
ctx->used += len; |
|
copied += len; |
|
size -= len; |
|
continue; |
|
} |
|
|
|
if (!af_alg_writable(sk)) { |
|
err = af_alg_wait_for_wmem(sk, msg->msg_flags); |
|
if (err) |
|
goto unlock; |
|
} |
|
|
|
/* allocate a new page */ |
|
len = min_t(unsigned long, len, af_alg_sndbuf(sk)); |
|
|
|
err = af_alg_alloc_tsgl(sk); |
|
if (err) |
|
goto unlock; |
|
|
|
sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, |
|
list); |
|
sg = sgl->sg; |
|
if (sgl->cur) |
|
sg_unmark_end(sg + sgl->cur - 1); |
|
|
|
do { |
|
struct page *pg; |
|
unsigned int i = sgl->cur; |
|
|
|
plen = min_t(size_t, len, PAGE_SIZE); |
|
|
|
pg = alloc_page(GFP_KERNEL); |
|
if (!pg) { |
|
err = -ENOMEM; |
|
goto unlock; |
|
} |
|
|
|
sg_assign_page(sg + i, pg); |
|
|
|
err = memcpy_from_msg(page_address(sg_page(sg + i)), |
|
msg, plen); |
|
if (err) { |
|
__free_page(sg_page(sg + i)); |
|
sg_assign_page(sg + i, NULL); |
|
goto unlock; |
|
} |
|
|
|
sg[i].length = plen; |
|
len -= plen; |
|
ctx->used += plen; |
|
copied += plen; |
|
size -= plen; |
|
sgl->cur++; |
|
} while (len && sgl->cur < MAX_SGL_ENTS); |
|
|
|
if (!size) |
|
sg_mark_end(sg + sgl->cur - 1); |
|
|
|
ctx->merge = plen & (PAGE_SIZE - 1); |
|
} |
|
|
|
err = 0; |
|
|
|
ctx->more = msg->msg_flags & MSG_MORE; |
|
|
|
unlock: |
|
af_alg_data_wakeup(sk); |
|
release_sock(sk); |
|
|
|
return copied ?: err; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_sendmsg); |
|
|
|
/** |
|
* af_alg_sendpage - sendpage system call handler |
|
* @sock: socket of connection to user space to write to |
|
* @page: data to send |
|
* @offset: offset into page to begin sending |
|
* @size: length of data |
|
* @flags: message send/receive flags |
|
* |
|
* This is a generic implementation of sendpage to fill ctx->tsgl_list. |
|
*/ |
|
ssize_t af_alg_sendpage(struct socket *sock, struct page *page, |
|
int offset, size_t size, int flags) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
struct af_alg_tsgl *sgl; |
|
int err = -EINVAL; |
|
|
|
if (flags & MSG_SENDPAGE_NOTLAST) |
|
flags |= MSG_MORE; |
|
|
|
lock_sock(sk); |
|
if (!ctx->more && ctx->used) |
|
goto unlock; |
|
|
|
if (!size) |
|
goto done; |
|
|
|
if (!af_alg_writable(sk)) { |
|
err = af_alg_wait_for_wmem(sk, flags); |
|
if (err) |
|
goto unlock; |
|
} |
|
|
|
err = af_alg_alloc_tsgl(sk); |
|
if (err) |
|
goto unlock; |
|
|
|
ctx->merge = 0; |
|
sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); |
|
|
|
if (sgl->cur) |
|
sg_unmark_end(sgl->sg + sgl->cur - 1); |
|
|
|
sg_mark_end(sgl->sg + sgl->cur); |
|
|
|
get_page(page); |
|
sg_set_page(sgl->sg + sgl->cur, page, size, offset); |
|
sgl->cur++; |
|
ctx->used += size; |
|
|
|
done: |
|
ctx->more = flags & MSG_MORE; |
|
|
|
unlock: |
|
af_alg_data_wakeup(sk); |
|
release_sock(sk); |
|
|
|
return err ?: size; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_sendpage); |
|
|
|
/** |
|
* af_alg_free_resources - release resources required for crypto request |
|
* @areq: Request holding the TX and RX SGL |
|
*/ |
|
void af_alg_free_resources(struct af_alg_async_req *areq) |
|
{ |
|
struct sock *sk = areq->sk; |
|
|
|
af_alg_free_areq_sgls(areq); |
|
sock_kfree_s(sk, areq, areq->areqlen); |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_free_resources); |
|
|
|
/** |
|
* af_alg_async_cb - AIO callback handler |
|
* @_req: async request info |
|
* @err: if non-zero, error result to be returned via ki_complete(); |
|
* otherwise return the AIO output length via ki_complete(). |
|
* |
|
* This handler cleans up the struct af_alg_async_req upon completion of the |
|
* AIO operation. |
|
* |
|
* The number of bytes to be generated with the AIO operation must be set |
|
* in areq->outlen before the AIO callback handler is invoked. |
|
*/ |
|
void af_alg_async_cb(struct crypto_async_request *_req, int err) |
|
{ |
|
struct af_alg_async_req *areq = _req->data; |
|
struct sock *sk = areq->sk; |
|
struct kiocb *iocb = areq->iocb; |
|
unsigned int resultlen; |
|
|
|
/* Buffer size written by crypto operation. */ |
|
resultlen = areq->outlen; |
|
|
|
af_alg_free_resources(areq); |
|
sock_put(sk); |
|
|
|
iocb->ki_complete(iocb, err ? err : (int)resultlen); |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_async_cb); |
|
|
|
/** |
|
* af_alg_poll - poll system call handler |
|
* @file: file pointer |
|
* @sock: socket to poll |
|
* @wait: poll_table |
|
*/ |
|
__poll_t af_alg_poll(struct file *file, struct socket *sock, |
|
poll_table *wait) |
|
{ |
|
struct sock *sk = sock->sk; |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
__poll_t mask; |
|
|
|
sock_poll_wait(file, sock, wait); |
|
mask = 0; |
|
|
|
if (!ctx->more || ctx->used) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
|
|
if (af_alg_writable(sk)) |
|
mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; |
|
|
|
return mask; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_poll); |
|
|
|
/** |
|
* af_alg_alloc_areq - allocate struct af_alg_async_req |
|
* |
|
* @sk: socket of connection to user space |
|
* @areqlen: size of struct af_alg_async_req + crypto_*_reqsize |
|
* Return: allocated data structure or ERR_PTR upon error |
|
*/ |
|
struct af_alg_async_req *af_alg_alloc_areq(struct sock *sk, |
|
unsigned int areqlen) |
|
{ |
|
struct af_alg_async_req *areq = sock_kmalloc(sk, areqlen, GFP_KERNEL); |
|
|
|
if (unlikely(!areq)) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
areq->areqlen = areqlen; |
|
areq->sk = sk; |
|
areq->last_rsgl = NULL; |
|
INIT_LIST_HEAD(&areq->rsgl_list); |
|
areq->tsgl = NULL; |
|
areq->tsgl_entries = 0; |
|
|
|
return areq; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_alloc_areq); |
|
|
|
/** |
|
* af_alg_get_rsgl - create the RX SGL for the output data from the crypto |
|
* operation |
|
* |
|
* @sk: socket of connection to user space |
|
* @msg: user space message |
|
* @flags: flags used to invoke recvmsg with |
|
* @areq: instance of the cryptographic request that will hold the RX SGL |
|
* @maxsize: maximum number of bytes to be pulled from user space |
|
* @outlen: number of bytes in the RX SGL |
|
* Return: 0 on success, < 0 upon error |
|
*/ |
|
int af_alg_get_rsgl(struct sock *sk, struct msghdr *msg, int flags, |
|
struct af_alg_async_req *areq, size_t maxsize, |
|
size_t *outlen) |
|
{ |
|
struct alg_sock *ask = alg_sk(sk); |
|
struct af_alg_ctx *ctx = ask->private; |
|
size_t len = 0; |
|
|
|
while (maxsize > len && msg_data_left(msg)) { |
|
struct af_alg_rsgl *rsgl; |
|
size_t seglen; |
|
int err; |
|
|
|
/* limit the amount of readable buffers */ |
|
if (!af_alg_readable(sk)) |
|
break; |
|
|
|
seglen = min_t(size_t, (maxsize - len), |
|
msg_data_left(msg)); |
|
|
|
if (list_empty(&areq->rsgl_list)) { |
|
rsgl = &areq->first_rsgl; |
|
} else { |
|
rsgl = sock_kmalloc(sk, sizeof(*rsgl), GFP_KERNEL); |
|
if (unlikely(!rsgl)) |
|
return -ENOMEM; |
|
} |
|
|
|
rsgl->sgl.npages = 0; |
|
list_add_tail(&rsgl->list, &areq->rsgl_list); |
|
|
|
/* make one iovec available as scatterlist */ |
|
err = af_alg_make_sg(&rsgl->sgl, &msg->msg_iter, seglen); |
|
if (err < 0) { |
|
rsgl->sg_num_bytes = 0; |
|
return err; |
|
} |
|
|
|
/* chain the new scatterlist with previous one */ |
|
if (areq->last_rsgl) |
|
af_alg_link_sg(&areq->last_rsgl->sgl, &rsgl->sgl); |
|
|
|
areq->last_rsgl = rsgl; |
|
len += err; |
|
atomic_add(err, &ctx->rcvused); |
|
rsgl->sg_num_bytes = err; |
|
} |
|
|
|
*outlen = len; |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(af_alg_get_rsgl); |
|
|
|
static int __init af_alg_init(void) |
|
{ |
|
int err = proto_register(&alg_proto, 0); |
|
|
|
if (err) |
|
goto out; |
|
|
|
err = sock_register(&alg_family); |
|
if (err != 0) |
|
goto out_unregister_proto; |
|
|
|
out: |
|
return err; |
|
|
|
out_unregister_proto: |
|
proto_unregister(&alg_proto); |
|
goto out; |
|
} |
|
|
|
static void __exit af_alg_exit(void) |
|
{ |
|
sock_unregister(PF_ALG); |
|
proto_unregister(&alg_proto); |
|
} |
|
|
|
module_init(af_alg_init); |
|
module_exit(af_alg_exit); |
|
MODULE_LICENSE("GPL"); |
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MODULE_ALIAS_NETPROTO(AF_ALG);
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