![Huw Davies](/assets/img/avatar_default.png)
Query a specified DOI through the NLBL_CALIPSO_C_LIST command. It requires the attribute: NLBL_CALIPSO_A_DOI. The reply will contain: NLBL_CALIPSO_A_MTYPE Signed-off-by: Huw Davies <huw@codeweavers.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
319 lines
8.1 KiB
C
319 lines
8.1 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* netlbl_calipso_list - Handle a LIST message
|
|
* @skb: the NETLINK buffer
|
|
* @info: the Generic NETLINK info block
|
|
*
|
|
* Description:
|
|
* Process a user generated LIST message and respond accordingly.
|
|
* Returns zero on success and negative values on error.
|
|
*
|
|
*/
|
|
static int netlbl_calipso_list(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int ret_val;
|
|
struct sk_buff *ans_skb = NULL;
|
|
void *data;
|
|
u32 doi;
|
|
struct calipso_doi *doi_def;
|
|
|
|
if (!info->attrs[NLBL_CALIPSO_A_DOI]) {
|
|
ret_val = -EINVAL;
|
|
goto list_failure;
|
|
}
|
|
|
|
doi = nla_get_u32(info->attrs[NLBL_CALIPSO_A_DOI]);
|
|
|
|
doi_def = calipso_doi_getdef(doi);
|
|
if (!doi_def) {
|
|
ret_val = -EINVAL;
|
|
goto list_failure;
|
|
}
|
|
|
|
ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!ans_skb) {
|
|
ret_val = -ENOMEM;
|
|
goto list_failure_put;
|
|
}
|
|
data = genlmsg_put_reply(ans_skb, info, &netlbl_calipso_gnl_family,
|
|
0, NLBL_CALIPSO_C_LIST);
|
|
if (!data) {
|
|
ret_val = -ENOMEM;
|
|
goto list_failure_put;
|
|
}
|
|
|
|
ret_val = nla_put_u32(ans_skb, NLBL_CALIPSO_A_MTYPE, doi_def->type);
|
|
if (ret_val != 0)
|
|
goto list_failure_put;
|
|
|
|
calipso_doi_putdef(doi_def);
|
|
|
|
genlmsg_end(ans_skb, data);
|
|
return genlmsg_reply(ans_skb, info);
|
|
|
|
list_failure_put:
|
|
calipso_doi_putdef(doi_def);
|
|
list_failure:
|
|
kfree_skb(ans_skb);
|
|
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,
|
|
},
|
|
{
|
|
.cmd = NLBL_CALIPSO_C_LIST,
|
|
.flags = 0,
|
|
.policy = calipso_genl_policy,
|
|
.doit = netlbl_calipso_list,
|
|
.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);
|
|
}
|
|
|
|
/**
|
|
* calipso_doi_getdef - Returns a reference to a valid DOI definition
|
|
* @doi: the DOI value
|
|
*
|
|
* Description:
|
|
* Searches for a valid DOI definition and if one is found it is returned to
|
|
* the caller. Otherwise NULL is returned. The caller must ensure that
|
|
* calipso_doi_putdef() is called when the caller is done.
|
|
*
|
|
*/
|
|
struct calipso_doi *calipso_doi_getdef(u32 doi)
|
|
{
|
|
struct calipso_doi *ret_val = NULL;
|
|
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
|
|
|
|
if (ops)
|
|
ret_val = ops->doi_getdef(doi);
|
|
return ret_val;
|
|
}
|
|
|
|
/**
|
|
* calipso_doi_putdef - Releases a reference for the given DOI definition
|
|
* @doi_def: the DOI definition
|
|
*
|
|
* Description:
|
|
* Releases a DOI definition reference obtained from calipso_doi_getdef().
|
|
*
|
|
*/
|
|
void calipso_doi_putdef(struct calipso_doi *doi_def)
|
|
{
|
|
const struct netlbl_calipso_ops *ops = netlbl_calipso_ops_get();
|
|
|
|
if (ops)
|
|
ops->doi_putdef(doi_def);
|
|
}
|