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/*
* NetLabel Kernel API
*
* This file defines the kernel API for the NetLabel system. The NetLabel
* system manages static and dynamic label mappings for network protocols such
* as CIPSO and RIPSO.
*
* Author: Paul Moore <paul.moore@hp.com>
*
*/
/*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/init.h>
#include <linux/types.h>
#include <net/ip.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <asm/bug.h>
#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
#include "netlabel_user.h"
/*
* LSM Functions
*/
/**
* netlbl_socket_setattr - Label a socket using the correct protocol
* @sock: the socket to label
* @secattr: the security attributes
*
* Description:
* Attach the correct label to the given socket using the security attributes
* specified in @secattr. This function requires exclusive access to
* @sock->sk, which means it either needs to be in the process of being
* created or locked via lock_sock(sock->sk). Returns zero on success,
* negative values on failure.
*
*/
int netlbl_socket_setattr(const struct socket *sock,
const struct netlbl_lsm_secattr *secattr)
{
int ret_val = -ENOENT;
struct netlbl_dom_map *dom_entry;
rcu_read_lock();
dom_entry = netlbl_domhsh_getentry(secattr->domain);
if (dom_entry == NULL)
goto socket_setattr_return;
switch (dom_entry->type) {
case NETLBL_NLTYPE_CIPSOV4:
ret_val = cipso_v4_socket_setattr(sock,
dom_entry->type_def.cipsov4,
secattr);
break;
case NETLBL_NLTYPE_UNLABELED:
ret_val = 0;
break;
default:
ret_val = -ENOENT;
}
socket_setattr_return:
rcu_read_unlock();
return ret_val;
}
/**
* netlbl_socket_getattr - Determine the security attributes of a socket
* @sock: the socket
* @secattr: the security attributes
*
* Description:
* Examines the given socket to see any NetLabel style labeling has been
* applied to the socket, if so it parses the socket label and returns the
* security attributes in @secattr. Returns zero on success, negative values
* on failure.
*
*/
int netlbl_socket_getattr(const struct socket *sock,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
ret_val = cipso_v4_socket_getattr(sock, secattr);
if (ret_val == 0)
return 0;
return netlbl_unlabel_getattr(secattr);
}
/**
* netlbl_skbuff_getattr - Determine the security attributes of a packet
* @skb: the packet
* @secattr: the security attributes
*
* Description:
* Examines the given packet to see if a recognized form of packet labeling
* is present, if so it parses the packet label and returns the security
* attributes in @secattr. Returns zero on success, negative values on
* failure.
*
*/
int netlbl_skbuff_getattr(const struct sk_buff *skb,
struct netlbl_lsm_secattr *secattr)
{
int ret_val;
ret_val = cipso_v4_skbuff_getattr(skb, secattr);
if (ret_val == 0)
return 0;
return netlbl_unlabel_getattr(secattr);
}
/**
* netlbl_skbuff_err - Handle a LSM error on a sk_buff
* @skb: the packet
* @error: the error code
*
* Description:
* Deal with a LSM problem when handling the packet in @skb, typically this is
* a permission denied problem (-EACCES). The correct action is determined
* according to the packet's labeling protocol.
*
*/
void netlbl_skbuff_err(struct sk_buff *skb, int error)
{
if (CIPSO_V4_OPTEXIST(skb))
cipso_v4_error(skb, error, 0);
}
/**
* netlbl_cache_invalidate - Invalidate all of the NetLabel protocol caches
*
* Description:
* For all of the NetLabel protocols that support some form of label mapping
* cache, invalidate the cache. Returns zero on success, negative values on
* error.
*
*/
void netlbl_cache_invalidate(void)
{
cipso_v4_cache_invalidate();
}
/**
* netlbl_cache_add - Add an entry to a NetLabel protocol cache
* @skb: the packet
* @secattr: the packet's security attributes
*
* Description:
* Add the LSM security attributes for the given packet to the underlying
* NetLabel protocol's label mapping cache. Returns zero on success, negative
* values on error.
*
*/
int netlbl_cache_add(const struct sk_buff *skb,
const struct netlbl_lsm_secattr *secattr)
{
if (secattr->cache.data == NULL)
return -ENOMSG;
if (CIPSO_V4_OPTEXIST(skb))
return cipso_v4_cache_add(skb, secattr);
return -ENOMSG;
}
/*
* Setup Functions
*/
/**
* netlbl_init - Initialize NetLabel
*
* Description:
* Perform the required NetLabel initialization before first use.
*
*/
static int __init netlbl_init(void)
{
int ret_val;
printk(KERN_INFO "NetLabel: Initializing\n");
printk(KERN_INFO "NetLabel: domain hash size = %u\n",
(1 << NETLBL_DOMHSH_BITSIZE));
printk(KERN_INFO "NetLabel: protocols ="
" UNLABELED"
" CIPSOv4"
"\n");
ret_val = netlbl_domhsh_init(NETLBL_DOMHSH_BITSIZE);
if (ret_val != 0)
goto init_failure;
ret_val = netlbl_netlink_init();
if (ret_val != 0)
goto init_failure;
ret_val = netlbl_unlabel_defconf();
if (ret_val != 0)
goto init_failure;
printk(KERN_INFO "NetLabel: unlabeled traffic allowed by default\n");
return 0;
init_failure:
panic("NetLabel: failed to initialize properly (%d)\n", ret_val);
}
subsys_initcall(netlbl_init);
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