linux/net/netlabel/netlabel_mgmt.c

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/*
* NetLabel Management Support
*
* This file defines the management functions 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/types.h>
#include <linux/socket.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <net/cipso_ipv4.h>
#include "netlabel_domainhash.h"
#include "netlabel_user.h"
#include "netlabel_mgmt.h"
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_mgmt_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_MGMT_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = 0,
};
/*
* NetLabel Command Handlers
*/
/**
* netlbl_mgmt_add - Handle an ADD message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated ADD message and add the domains from the message
* to the hash table. See netlabel.h for a description of the message format.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_add(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct nlattr *msg_ptr = netlbl_netlink_payload_data(skb);
int msg_len = netlbl_netlink_payload_len(skb);
u32 count;
struct netlbl_dom_map *entry = NULL;
u32 iter;
u32 tmp_val;
int tmp_size;
ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
if (ret_val != 0)
goto add_failure;
if (msg_len < NETLBL_LEN_U32)
goto add_failure;
count = netlbl_getinc_u32(&msg_ptr, &msg_len);
for (iter = 0; iter < count && msg_len > 0; iter++, entry = NULL) {
if (msg_len <= 0) {
ret_val = -EINVAL;
goto add_failure;
}
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (entry == NULL) {
ret_val = -ENOMEM;
goto add_failure;
}
tmp_size = nla_len(msg_ptr);
if (tmp_size <= 0 || tmp_size > msg_len) {
ret_val = -EINVAL;
goto add_failure;
}
entry->domain = kmalloc(tmp_size, GFP_KERNEL);
if (entry->domain == NULL) {
ret_val = -ENOMEM;
goto add_failure;
}
nla_strlcpy(entry->domain, msg_ptr, tmp_size);
entry->domain[tmp_size - 1] = '\0';
msg_ptr = nla_next(msg_ptr, &msg_len);
if (msg_len < NETLBL_LEN_U32) {
ret_val = -EINVAL;
goto add_failure;
}
tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len);
entry->type = tmp_val;
switch (tmp_val) {
case NETLBL_NLTYPE_UNLABELED:
ret_val = netlbl_domhsh_add(entry);
break;
case NETLBL_NLTYPE_CIPSOV4:
if (msg_len < NETLBL_LEN_U32) {
ret_val = -EINVAL;
goto add_failure;
}
tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len);
/* We should be holding a rcu_read_lock() here
* while we hold the result but since the entry
* will always be deleted when the CIPSO DOI
* is deleted we aren't going to keep the lock. */
rcu_read_lock();
entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
if (entry->type_def.cipsov4 == NULL) {
rcu_read_unlock();
ret_val = -EINVAL;
goto add_failure;
}
ret_val = netlbl_domhsh_add(entry);
rcu_read_unlock();
break;
default:
ret_val = -EINVAL;
}
if (ret_val != 0)
goto add_failure;
}
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
NETLBL_E_OK);
return 0;
add_failure:
if (entry)
kfree(entry->domain);
kfree(entry);
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_remove - Handle a REMOVE message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVE message and remove the specified domain
* mappings. Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_remove(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct nlattr *msg_ptr = netlbl_netlink_payload_data(skb);
int msg_len = netlbl_netlink_payload_len(skb);
u32 count;
u32 iter;
int tmp_size;
unsigned char *domain;
ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
if (ret_val != 0)
goto remove_return;
if (msg_len < NETLBL_LEN_U32)
goto remove_return;
count = netlbl_getinc_u32(&msg_ptr, &msg_len);
for (iter = 0; iter < count && msg_len > 0; iter++) {
if (msg_len <= 0) {
ret_val = -EINVAL;
goto remove_return;
}
tmp_size = nla_len(msg_ptr);
domain = nla_data(msg_ptr);
if (tmp_size <= 0 || tmp_size > msg_len ||
domain[tmp_size - 1] != '\0') {
ret_val = -EINVAL;
goto remove_return;
}
ret_val = netlbl_domhsh_remove(domain);
if (ret_val != 0)
goto remove_return;
msg_ptr = nla_next(msg_ptr, &msg_len);
}
ret_val = 0;
remove_return:
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_list - Handle a LIST message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LIST message and dumps the domain hash table in a
* form suitable for use in a kernel generated LIST message. Returns zero on
* success, negative values on failure.
*
*/
static int netlbl_mgmt_list(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -ENOMEM;
struct sk_buff *ans_skb;
ans_skb = netlbl_domhsh_dump(NLMSG_SPACE(GENL_HDRLEN));
if (ans_skb == NULL)
goto list_failure;
netlbl_netlink_hdr_push(ans_skb,
info->snd_pid,
0,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_LIST);
ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
if (ret_val != 0)
goto list_failure;
return 0;
list_failure:
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_adddef - Handle an ADDDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated ADDDEF message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_adddef(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct nlattr *msg_ptr = netlbl_netlink_payload_data(skb);
int msg_len = netlbl_netlink_payload_len(skb);
struct netlbl_dom_map *entry = NULL;
u32 tmp_val;
ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
if (ret_val != 0)
goto adddef_failure;
if (msg_len < NETLBL_LEN_U32)
goto adddef_failure;
tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len);
entry = kzalloc(sizeof(*entry), GFP_KERNEL);
if (entry == NULL) {
ret_val = -ENOMEM;
goto adddef_failure;
}
entry->type = tmp_val;
switch (entry->type) {
case NETLBL_NLTYPE_UNLABELED:
ret_val = netlbl_domhsh_add_default(entry);
break;
case NETLBL_NLTYPE_CIPSOV4:
if (msg_len < NETLBL_LEN_U32) {
ret_val = -EINVAL;
goto adddef_failure;
}
tmp_val = netlbl_getinc_u32(&msg_ptr, &msg_len);
/* We should be holding a rcu_read_lock here while we
* hold the result but since the entry will always be
* deleted when the CIPSO DOI is deleted we are going
* to skip the lock. */
rcu_read_lock();
entry->type_def.cipsov4 = cipso_v4_doi_getdef(tmp_val);
if (entry->type_def.cipsov4 == NULL) {
rcu_read_unlock();
ret_val = -EINVAL;
goto adddef_failure;
}
ret_val = netlbl_domhsh_add_default(entry);
rcu_read_unlock();
break;
default:
ret_val = -EINVAL;
}
if (ret_val != 0)
goto adddef_failure;
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
NETLBL_E_OK);
return 0;
adddef_failure:
kfree(entry);
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_removedef - Handle a REMOVEDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVEDEF message and remove the default domain
* mapping. Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_removedef(struct sk_buff *skb, struct genl_info *info)
{
int ret_val;
ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
if (ret_val != 0)
goto removedef_return;
ret_val = netlbl_domhsh_remove_default();
removedef_return:
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_listdef - Handle a LISTDEF message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LISTDEF message and dumps the default domain
* mapping in a form suitable for use in a kernel generated LISTDEF message.
* Returns zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_listdef(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -ENOMEM;
struct sk_buff *ans_skb;
ans_skb = netlbl_domhsh_dump_default(NLMSG_SPACE(GENL_HDRLEN));
if (ans_skb == NULL)
goto listdef_failure;
netlbl_netlink_hdr_push(ans_skb,
info->snd_pid,
0,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_LISTDEF);
ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
if (ret_val != 0)
goto listdef_failure;
return 0;
listdef_failure:
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_modules - Handle a MODULES message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated MODULES message and respond accordingly.
*
*/
static int netlbl_mgmt_modules(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -ENOMEM;
size_t data_size;
u32 mod_count;
struct sk_buff *ans_skb = NULL;
/* unlabeled + cipsov4 */
mod_count = 2;
data_size = GENL_HDRLEN + NETLBL_LEN_U32 + mod_count * NETLBL_LEN_U32;
ans_skb = netlbl_netlink_alloc_skb(0, data_size, GFP_KERNEL);
if (ans_skb == NULL)
goto modules_failure;
if (netlbl_netlink_hdr_put(ans_skb,
info->snd_pid,
0,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_MODULES) == NULL)
goto modules_failure;
ret_val = nla_put_u32(ans_skb, NLA_U32, mod_count);
if (ret_val != 0)
goto modules_failure;
ret_val = nla_put_u32(ans_skb, NLA_U32, NETLBL_NLTYPE_UNLABELED);
if (ret_val != 0)
goto modules_failure;
ret_val = nla_put_u32(ans_skb, NLA_U32, NETLBL_NLTYPE_CIPSOV4);
if (ret_val != 0)
goto modules_failure;
ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
if (ret_val != 0)
goto modules_failure;
return 0;
modules_failure:
kfree_skb(ans_skb);
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_mgmt_version - Handle a VERSION message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated VERSION message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_mgmt_version(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -ENOMEM;
struct sk_buff *ans_skb = NULL;
ans_skb = netlbl_netlink_alloc_skb(0,
GENL_HDRLEN + NETLBL_LEN_U32,
GFP_KERNEL);
if (ans_skb == NULL)
goto version_failure;
if (netlbl_netlink_hdr_put(ans_skb,
info->snd_pid,
0,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_VERSION) == NULL)
goto version_failure;
ret_val = nla_put_u32(ans_skb, NLA_U32, NETLBL_PROTO_VERSION);
if (ret_val != 0)
goto version_failure;
ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
if (ret_val != 0)
goto version_failure;
return 0;
version_failure:
kfree_skb(ans_skb);
netlbl_netlink_send_ack(info,
netlbl_mgmt_gnl_family.id,
NLBL_MGMT_C_ACK,
-ret_val);
return ret_val;
}
/*
* NetLabel Generic NETLINK Command Definitions
*/
static struct genl_ops netlbl_mgmt_genl_c_add = {
.cmd = NLBL_MGMT_C_ADD,
.flags = 0,
.doit = netlbl_mgmt_add,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_remove = {
.cmd = NLBL_MGMT_C_REMOVE,
.flags = 0,
.doit = netlbl_mgmt_remove,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_list = {
.cmd = NLBL_MGMT_C_LIST,
.flags = 0,
.doit = netlbl_mgmt_list,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_adddef = {
.cmd = NLBL_MGMT_C_ADDDEF,
.flags = 0,
.doit = netlbl_mgmt_adddef,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_removedef = {
.cmd = NLBL_MGMT_C_REMOVEDEF,
.flags = 0,
.doit = netlbl_mgmt_removedef,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_listdef = {
.cmd = NLBL_MGMT_C_LISTDEF,
.flags = 0,
.doit = netlbl_mgmt_listdef,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_modules = {
.cmd = NLBL_MGMT_C_MODULES,
.flags = 0,
.doit = netlbl_mgmt_modules,
.dumpit = NULL,
};
static struct genl_ops netlbl_mgmt_genl_c_version = {
.cmd = NLBL_MGMT_C_VERSION,
.flags = 0,
.doit = netlbl_mgmt_version,
.dumpit = NULL,
};
/*
* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_mgmt_genl_init - Register the NetLabel management component
*
* Description:
* Register the NetLabel management component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int netlbl_mgmt_genl_init(void)
{
int ret_val;
ret_val = genl_register_family(&netlbl_mgmt_gnl_family);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_add);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_remove);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_list);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_adddef);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_removedef);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_listdef);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_modules);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_mgmt_gnl_family,
&netlbl_mgmt_genl_c_version);
if (ret_val != 0)
return ret_val;
return 0;
}