path: root/net/netlabel/netlabel_kapi.c

/*
 * 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, 2008
 *
 * 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 <linux/slab.h>
#include <linux/audit.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include <asm/bug.h>
#include <asm/atomic.h>

#include "netlabel_domainhash.h"
#include "netlabel_unlabeled.h"
#include "netlabel_cipso_v4.h"
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
#include "netlabel_addrlist.h"

/*
 * Configuration Functions
 */

/**
 * netlbl_cfg_map_del - Remove a NetLabel/LSM domain mapping
 * @domain: the domain mapping to remove
 * @family: address family
 * @addr: IP address
 * @mask: IP address mask
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Removes a NetLabel/LSM domain mapping.  A @domain value of NULL causes the
 * default domain mapping to be removed.  Returns zero on success, negative
 * values on failure.
 *
 */
int netlbl_cfg_map_del(const char *domain,
		       u16 family,
		       const void *addr,
		       const void *mask,
		       struct netlbl_audit *audit_info)
{
	if (addr == NULL && mask == NULL) {
		return netlbl_domhsh_remove(domain, audit_info);
	} else if (addr != NULL && mask != NULL) {
		switch (family) {
		case AF_INET:
			return netlbl_domhsh_remove_af4(domain, addr, mask,
							audit_info);
		default:
			return -EPFNOSUPPORT;
		}
	} else
		return -EINVAL;
}

/**
 * netlbl_cfg_unlbl_map_add - Add a new unlabeled mapping
 * @domain: the domain mapping to add
 * @family: address family
 * @addr: IP address
 * @mask: IP address mask
 * @audit_info: NetLabel audit information
 *
 * Description:
 * Adds a new unlabeled NetLabel/LSM domain mapping.  A @domain value of NULL
 * causes a new default domain mapping to be added.  Returns zero on success,
 * negative values on failure.
 *
 */
int netlbl_cfg_unlbl_map_add(const char *domain,
			     u16 family,
			     const void *addr,
			     const void *mask,
			     struct netlbl_audit *audit_info)
{
	int ret_val = -ENOMEM;
	struct netlbl_dom_map *entry;
	struct netlbl_domaddr_map *addrmap = NULL;
	struct netlbl_domaddr4_map *map4 = NULL;
	struct netlbl_domaddr6_map *map6 = NULL;
	const struct in_addr *addr4, *mask4;
	const struct in6_addr *addr6, *mask6;

	entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
	if (entry == NULL)
		return -ENOMEM;
	if (domain != NULL) {
		entry->domain = kstrdup(domain, GFP_ATOMIC);
		if (entry->domain == NULL)
			goto cfg_unlbl_map_add_failure;
	}

	if (addr == NULL && mask == NULL)
		entry->type = NETLBL_NLTYPE_UNLABELED;
	else if (addr != NULL && mask != NULL) {
		addrmap = kzalloc(sizeof(*addrmap), GFP_ATOMIC);
		if (addrmap == NULL)
			goto cfg_unlbl_map_add_failure;
		INIT_LIST_HEAD(&addrmap->list4);
		INIT_LIST_HEAD(&addrmap->list6);

		switch (family) {
		case AF_INET:
			addr4 = addr;
			mask4 = mask;
			map4 = kzalloc(sizeof(*map4), GFP_ATOMIC);
			if (map4 == NULL)
				goto cfg_unlbl_map_add_failure;
			map4->type = NETLBL_NLTYPE_UNLABELED;
			map4->list.addr = addr4->s_addr & mask4->s_addr;
			map4->list.mask = mask4->s_addr;
			map4->list.valid = 1;
			ret_val