litmus-rt.git - The LITMUS^RT kernel.

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/* * af_alg: User-space algorithm interface * * This file provides the user-space API for algorithms. * * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <asm/atomic.h> #include <crypto/if_alg.h> #include <linux/crypto.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> #include <linux/net.h> #include <linux/rwsem.h> struct alg_type_list { const struct af_alg_type *type; struct list_head list; }; static atomic_long_t alg_memory_allocated; static struct proto alg_proto = { .name = "ALG", .owner = THIS_MODULE, .memory_allocated = &alg_memory_allocated, .obj_size = sizeof(struct alg_sock), }; static LIST_HEAD(alg_types); static DECLARE_RWSEM(alg_types_sem); static const struct af_alg_type *alg_get_type(const char *name) { const struct af_alg_type *type = ERR_PTR(-ENOENT); struct alg_type_list *node; down_read(&alg_types_sem); list_for_each_entry(node, &alg_types, list) { if (strcmp(node->type->name, name)) continue; if (try_module_get(node->type->owner)) type = node->type; break; } up_read(&alg_types_sem); return type; } int af_alg_register_type(const struct af_alg_type *type) { struct alg_type_list *node; int err = -EEXIST; down_write(&alg_types_sem); list_for_each_entry(node, &alg_types, list) { if (!strcmp(node->type->name, type->name)) goto unlock; } node = kmalloc(sizeof(*node), GFP_KERNEL); err = -ENOMEM; if (!node) goto unlock; type->ops->owner = THIS_MODULE; node->type = type; list_add(&node->list, &alg_types); err = 0; unlock: up_write(&alg_types_sem); return err; } EXPORT_SYMBOL_GPL(af_alg_register_type); int af_alg_unregister_type(const struct af_alg_type *type) { struct alg_type_list *node; int err = -ENOENT; down_write(&alg_types_sem); list_for_each_entry(node, &alg_types, list) { if (strcmp(node->type->name, type->name)) continue; list_del(&node->list); kfree(node); err = 0; break; } up_write(&alg_types_sem); return err; } EXPORT_SYMBOL_GPL(af_alg_unregister_type); static void alg_do_release(const struct af_alg_type *type, void *private) { if (!type) return; type->release(private); module_put(type->owner); } int af_alg_release(struct socket *sock) { if (sock->sk) sock_put(sock->sk); return 0; } EXPORT_SYMBOL_GPL(af_alg_release); static int alg_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); struct sockaddr_alg *sa = (void *)uaddr; const struct af_alg_type *type; void *private; if (sock->state == SS_CONNECTED) return -EINVAL; if (addr_len != sizeof(*sa)) return -EINVAL; sa->salg_type[sizeof(sa->salg_type) - 1] = 0; sa->salg_name[sizeof(sa->salg_name) - 1] = 0; type = alg_get_type(sa->salg_type); if (IS_ERR(type) && PTR_ERR(type) == -ENOENT) { request_module("algif-%s", sa->salg_type); type = alg_get_type(sa->salg_type); } if (IS_ERR(type)) return PTR_ERR(type); private = type->bind(sa->salg_name, sa->salg_feat, sa->salg_mask); if (IS_ERR(private)) { module_put(type->owner); return PTR_ERR(private); } lock_sock(sk); swap(ask->type, type); swap(ask->private, private); release_sock(sk); alg_do_release(type, private); return 0; } static int alg_setkey(struct sock *sk, char __user *ukey, unsigned int keylen) { struct alg_sock *ask = alg_sk(sk); const struct af_alg_type *type = ask->type; u8 *key; int err; key = sock_kmalloc(sk, keylen, GFP_KERNEL); if (!key) return -ENOMEM; err = -EFAULT; if (copy_from_user(key, ukey, keylen)) goto out; err = type->setkey(ask->private, key, keylen); out: sock_kfree_s(sk, key, keylen); return err; } static int alg_setsockopt(struct socket *sock, int level, int optname, char __user *optval, unsigned int optlen) { struct sock *sk = sock->sk; struct alg_sock *ask = alg_sk(sk); const struct af_alg_type *type; int err = -ENOPROTOOPT; lock_sock(sk); type = ask->type;


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