/*
* NetLabel CALIPSO/IPv6 Support
*
* This file defines the CALIPSO/IPv6 functions for the NetLabel system. The
* NetLabel system manages static and dynamic label mappings for network
* protocols such as CIPSO and CALIPSO.
*
* Authors: Paul Moore <paul@paul-moore.com>
* Huw Davies <huw@codeweavers.com>
*
*/
/* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
* (c) Copyright Huw Davies <huw@codeweavers.com>, 2015
*
* 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, see <http://www.gnu.org/licenses/>.
*
*/
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/audit.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/calipso.h>
#include <linux/atomic.h>
#include "netlabel_user.h"
#include "netlabel_calipso.h"
#include "netlabel_mgmt.h"
#include "netlabel_domainhash.h"
/* NetLabel Generic NETLINK CALIPSO family */
static struct genl_family netlbl_calipso_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_CALIPSO_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = NLBL_CALIPSO_A_MAX,
};
/* NetLabel Netlink attribute policy */
static const struct nla_policy calipso_genl_policy[NLBL_CALIPSO_A_MAX + 1] = {
[NLBL_CALIPSO_A_DOI] = { .type = NLA_U32 },
[NLBL_CALIPSO_A_MTYPE] = { .type = NLA_U32 },
};
/* NetLabel Command Handlers
*/
/**
* netlbl_calipso_add_pass - Adds a CALIPSO pass DOI definition
* @info: the Generic NETLINK info block
* @audit_info: NetLabel audit information
*
* Description:
* Create a new CALIPSO_MAP_PASS DOI definition based on the given ADD message
* and add it to the CALIPSO engine. Return zero on success and non-zero on
* error.
*
*/
static int netlbl_calipso_add_pass(struct genl_info *info,
struct netlbl_audit *audit_info)
{
int ret_val;
struct calipso_doi *doi_def = NULL;
doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
if (!doi_def)
return -ENOMEM;
doi_def->type = CALIPSO_MAP_PASS;
doi_def->doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
ret_val = calipso_doi_add(doi_def, audit_info);
if (ret_val != 0)
calipso_doi_free(doi_def);
return ret_val;
}
/**
* netlbl_calipso_add - Handle an ADD message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Create a new DOI definition based on the given ADD message and add it to the
* CALIPSO engine. Returns zero on success, negative values on failure.
*
*/
static int netlbl_calipso_add(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct netlbl_audit audit_info;
if (!info->attrs[NLBL_CALIPSO_A_DOI] ||
!info->attrs[NLBL_CALIPSO_A_MTYPE])
return -EINVAL;
netlbl_netlink_auditinfo(skb, &audit_info);
switch (nla_get_u32(info->attrs[NLBL_CALIPSO_A_MTYPE])) {
case CALIPSO_MAP_PASS:
ret_val = netlbl_calipso_add_pass(info, &audit_info);
break;
}
if (ret_val == 0)
atomic_inc(&netlabel_mgmt_protocount);
return ret_val;
}
/* NetLabel Generic NETLINK Command Definitions
*/
static const struct genl_ops netlbl_calipso_ops[] = {
{
.cmd = NLBL_CALIPSO_C_ADD,
.flags = GENL_ADMIN_PERM,
.policy = calipso_genl_policy,
.doit = netlbl_calipso_add,
.dumpit = NULL,
},
};
/* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_calipso_genl_init - Register the CALIPSO NetLabel component
*
* Description:
* Register the CALIPSO packet NetLabel component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int __init netlbl_calipso_genl_init(void)
{
return genl_register_family_with_ops(&netlbl_calipso_gnl_family,
netlbl_calipso_ops);
}
static const struct netlbl_calipso_ops *calipso_ops;
/**
* netlbl_calipso_ops_register - Register the CALIPSO operations
*
* Description:
* Register the CALIPSO packet engine operations.
*
*/
const struct netlbl_calipso_ops *
netlbl_calipso_ops_register(const struct netlbl_calipso_ops *ops)
{
return xchg(&calipso_ops, ops);
}
EXPORT_SYMBOL(netlbl_calipso_ops_register);
static const struct netlbl_calipso_ops *netlbl_calipso_ops_get(void)
{
return ACCESS_ONCE(calipso_ops);
}
/**
* calipso_doi_add - Add a new DOI to the CALIPSO protocol engine
* @doi_def: the DOI structure
* @audit_info: NetLabel audit information
*
* Description:
* The caller defines a new DOI for use by the CALIPSO engine and calls this
* function to add it to the list of acceptable domains. The caller must
* ensure that the mapping table specified in @doi_def->map meets all of the
* requirements of the mapping type (see calipso.h for details). Returns
* zero on success and non-zero on failure.
*
*/
int calipso_doi_add(struct calipso_doi *doi_def,
struct netlbl_audit *audit_info)
{
int ret_val = -ENOMSG;
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ret_val = ops->doi_add(doi_def, audit_info);
return ret_val;
}
/**
* calipso_doi_free - Frees a DOI definition
* @doi_def: the DOI definition
*
* Description:
* This function frees all of the memory associated with a DOI definition.
*
*/
void calipso_doi_free(struct calipso_doi *doi_def)
{
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
if (ops)
ops->doi_free(doi_def);
}
