/*
* NetLabel CIPSO/IPv4 Support
*
* This file defines the CIPSO/IPv4 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_user.h"
#include "netlabel_cipso_v4.h"
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_cipsov4_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_CIPSOV4_NAME,
.version = NETLBL_PROTO_VERSION,
.maxattr = 0,
};
/*
* Helper Functions
*/
/**
* netlbl_cipsov4_doi_free - Frees a CIPSO V4 DOI definition
* @entry: the entry's RCU field
*
* Description:
* This function is designed to be used as a callback to the call_rcu()
* function so that the memory allocated to the DOI definition can be released
* safely.
*
*/
static void netlbl_cipsov4_doi_free(struct rcu_head *entry)
{
struct cipso_v4_doi *ptr;
ptr = container_of(entry, struct cipso_v4_doi, rcu);
switch (ptr->type) {
case CIPSO_V4_MAP_STD:
kfree(ptr->map.std->lvl.cipso);
kfree(ptr->map.std->lvl.local);
kfree(ptr->map.std->cat.cipso);
kfree(ptr->map.std->cat.local);
break;
}
kfree(ptr);
}
/*
* NetLabel Command Handlers
*/
/**
* netlbl_cipsov4_add_std - Adds a CIPSO V4 DOI definition
* @doi: the DOI value
* @msg: the ADD message data
* @msg_size: the size of the ADD message buffer
*
* Description:
* Create a new CIPSO_V4_MAP_STD DOI definition based on the given ADD message
* and add it to the CIPSO V4 engine. Return zero on success and non-zero on
* error.
*
*/
static int netlbl_cipsov4_add_std(u32 doi, struct nlattr *msg, size_t msg_size)
{
int ret_val = -EINVAL;
int msg_len = msg_size;
u32 num_tags;
u32 num_lvls;
u32 num_cats;
struct cipso_v4_doi *doi_def = NULL;
u32 iter;
u32 tmp_val_a;
u32 tmp_val_b;
if (msg_len < NETLBL_LEN_U32)
goto add_std_failure;
num_tags = netlbl_getinc_u32(&msg, &msg_len);
if (num_tags == 0 || num_tags > CIPSO_V4_TAG_MAXCNT)
goto add_std_failure;
doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
if (doi_def == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->map.std = kzalloc(sizeof(*doi_def->map.std), GFP_KERNEL);
if (doi_def->map.std == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->type = CIPSO_V4_MAP_STD;
for (iter = 0; iter < num_tags; iter++) {
if (msg_len < NETLBL_LEN_U8)
goto add_std_failure;
doi_def->tags[iter] = netlbl_getinc_u8(&msg, &msg_len);
switch (doi_def->tags[iter]) {
case CIPSO_V4_TAG_RBITMAP:
break;
default:
goto add_std_failure;
}
}
if (iter < CIPSO_V4_TAG_MAXCNT)
doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
if (msg_len < 6 * NETLBL_LEN_U32)
goto add_std_failure;
num_lvls = netlbl_getinc_u32(&msg, &msg_len);
if (num_lvls == 0)
goto add_std_failure;
doi_def->map.std->lvl.local_size = netlbl_getinc_u32(&msg, &msg_len);
if (doi_def->map.std->lvl.local_size > CIPSO_V4_MAX_LOC_LVLS)
goto add_std_failure;
doi_def->map.std->lvl.local = kcalloc(doi_def->map.std->lvl.local_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->lvl.local == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->map.std->lvl.cipso_size = netlbl_getinc_u8(&msg, &msg_len);
if (doi_def->map.std->lvl.cipso_size > CIPSO_V4_MAX_REM_LVLS)
goto add_std_failure;
doi_def->map.std->lvl.cipso = kcalloc(doi_def->map.std->lvl.cipso_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->lvl.cipso == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
num_cats = netlbl_getinc_u32(&msg, &msg_len);
doi_def->map.std->cat.local_size = netlbl_getinc_u32(&msg, &msg_len);
if (doi_def->map.std->cat.local_size > CIPSO_V4_MAX_LOC_CATS)
goto add_std_failure;
doi_def->map.std->cat.local = kcalloc(doi_def->map.std->cat.local_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->cat.local == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
doi_def->map.std->cat.cipso_size = netlbl_getinc_u16(&msg, &msg_len);
if (doi_def->map.std->cat.cipso_size > CIPSO_V4_MAX_REM_CATS)
goto add_std_failure;
doi_def->map.std->cat.cipso = kcalloc(doi_def->map.std->cat.cipso_size,
sizeof(u32),
GFP_KERNEL);
if (doi_def->map.std->cat.cipso == NULL) {
ret_val = -ENOMEM;
goto add_std_failure;
}
if (msg_len <
num_lvls * (NETLBL_LEN_U32 + NETLBL_LEN_U8) +
num_cats * (NETLBL_LEN_U32 + NETLBL_LEN_U16))
goto add_std_failure;
for (iter = 0; iter < doi_def->map.std->lvl.cipso_size; iter++)
doi_def->map.std->lvl.cipso[iter] = CIPSO_V4_INV_LVL;
for (iter = 0; iter < doi_def->map.std->lvl.local_size; iter++)
doi_def->map.std->lvl.local[iter] = CIPSO_V4_INV_LVL;
for (iter = 0; iter < doi_def->map.std->cat.cipso_size; iter++)
doi_def->map.std->cat.cipso[iter] = CIPSO_V4_INV_CAT;
for (iter = 0; iter < doi_def->map.std->cat.local_size; iter++)
doi_def->map.std->cat.local[iter] = CIPSO_V4_INV_CAT;
for (iter = 0; iter < num_lvls; iter++) {
tmp_val_a = netlbl_getinc_u32(&msg, &msg_len);
tmp_val_b = netlbl_getinc_u8(&msg, &msg_len);
if (tmp_val_a >= doi_def->map.std->lvl.local_size ||
tmp_val_b >= doi_def->map.std->lvl.cipso_size)
goto add_std_failure;
doi_def->map.std->lvl.cipso[tmp_val_b] = tmp_val_a;
doi_def->map.std->lvl.local[tmp_val_a] = tmp_val_b;
}
for (iter = 0; iter < num_cats; iter++) {
tmp_val_a = netlbl_getinc_u32(&msg, &msg_len);
tmp_val_b = netlbl_getinc_u16(&msg, &msg_len);
if (tmp_val_a >= doi_def->map.std->cat.local_size ||
tmp_val_b >= doi_def->map.std->cat.cipso_size)
goto add_std_failure;
doi_def->map.std->cat.cipso[tmp_val_b] = tmp_val_a;
doi_def->map.std->cat.local[tmp_val_a] = tmp_val_b;
}
doi_def->doi = doi;
ret_val = cipso_v4_doi_add(doi_def);
if (ret_val != 0)
goto add_std_failure;
return 0;
add_std_failure:
if (doi_def)
netlbl_cipsov4_doi_free(&doi_def->rcu);
return ret_val;
}
/**
* netlbl_cipsov4_add_pass - Adds a CIPSO V4 DOI definition
* @doi: the DOI value
* @msg: the ADD message data
* @msg_size: the size of the ADD message buffer
*
* Description:
* Create a new CIPSO_V4_MAP_PASS DOI definition based on the given ADD message
* and add it to the CIPSO V4 engine. Return zero on success and non-zero on
* error.
*
*/
static int netlbl_cipsov4_add_pass(u32 doi,
struct nlattr *msg,
size_t msg_size)
{
int ret_val = -EINVAL;
int msg_len = msg_size;
u32 num_tags;
struct cipso_v4_doi *doi_def = NULL;
u32 iter;
if (msg_len < NETLBL_LEN_U32)
goto add_pass_failure;
num_tags = netlbl_getinc_u32(&msg, &msg_len);
if (num_tags == 0 || num_tags > CIPSO_V4_TAG_MAXCNT)
goto add_pass_failure;
doi_def = kmalloc(sizeof(*doi_def), GFP_KERNEL);
if (doi_def == NULL) {
ret_val = -ENOMEM;
goto add_pass_failure;
}
doi_def->type = CIPSO_V4_MAP_PASS;
for (iter = 0; iter < num_tags; iter++) {
if (msg_len < NETLBL_LEN_U8)
goto add_pass_failure;
doi_def->tags[iter] = netlbl_getinc_u8(&msg, &msg_len);
switch (doi_def->tags[iter]) {
case CIPSO_V4_TAG_RBITMAP:
break;
default:
goto add_pass_failure;
}
}
if (iter < CIPSO_V4_TAG_MAXCNT)
doi_def->tags[iter] = CIPSO_V4_TAG_INVALID;
doi_def->doi = doi;
ret_val = cipso_v4_doi_add(doi_def);
if (ret_val != 0)
goto add_pass_failure;
return 0;
add_pass_failure:
if (doi_def)
netlbl_cipsov4_doi_free(&doi_def->rcu);
return ret_val;
}
/**
* netlbl_cipsov4_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
* CIPSO V4 engine. Returns zero on success, negative values on failure.
*
*/
static int netlbl_cipsov4_add(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
u32 doi;
u32 map_type;
int msg_len = netlbl_netlink_payload_len(skb);
struct nlattr *msg = netlbl_netlink_payload_data(skb);
ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
if (ret_val != 0)
goto add_return;
if (msg_len < 2 * NETLBL_LEN_U32)
goto add_return;
doi = netlbl_getinc_u32(&msg, &msg_len);
map_type = netlbl_getinc_u32(&msg, &msg_len);
switch (map_type) {
case CIPSO_V4_MAP_STD:
ret_val = netlbl_cipsov4_add_std(doi, msg, msg_len);
break;
case CIPSO_V4_MAP_PASS:
ret_val = netlbl_cipsov4_add_pass(doi, msg, msg_len);
break;
}
add_return:
netlbl_netlink_send_ack(info,
netlbl_cipsov4_gnl_family.id,
NLBL_CIPSOV4_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_cipsov4_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_cipsov4_list(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
u32 doi;
struct nlattr *msg = netlbl_netlink_payload_data(skb);
struct sk_buff *ans_skb;
if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32)
goto list_failure;
doi = nla_get_u32(msg);
ans_skb = cipso_v4_doi_dump(doi, NLMSG_SPACE(GENL_HDRLEN));
if (ans_skb == NULL) {
ret_val = -ENOMEM;
goto list_failure;
}
netlbl_netlink_hdr_push(ans_skb,
info->snd_pid,
0,
netlbl_cipsov4_gnl_family.id,
NLBL_CIPSOV4_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_cipsov4_gnl_family.id,
NLBL_CIPSOV4_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_cipsov4_listall - Handle a LISTALL message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated LISTALL message and respond accordingly. Returns
* zero on success and negative values on error.
*
*/
static int netlbl_cipsov4_listall(struct sk_buff *skb, struct genl_info *info)
{
int ret_val = -EINVAL;
struct sk_buff *ans_skb;
ans_skb = cipso_v4_doi_dump_all(NLMSG_SPACE(GENL_HDRLEN));
if (ans_skb == NULL) {
ret_val = -ENOMEM;
goto listall_failure;
}
netlbl_netlink_hdr_push(ans_skb,
info->snd_pid,
0,
netlbl_cipsov4_gnl_family.id,
NLBL_CIPSOV4_C_LISTALL);
ret_val = netlbl_netlink_snd(ans_skb, info->snd_pid);
if (ret_val != 0)
goto listall_failure;
return 0;
listall_failure:
netlbl_netlink_send_ack(info,
netlbl_cipsov4_gnl_family.id,
NLBL_CIPSOV4_C_ACK,
-ret_val);
return ret_val;
}
/**
* netlbl_cipsov4_remove - Handle a REMOVE message
* @skb: the NETLINK buffer
* @info: the Generic NETLINK info block
*
* Description:
* Process a user generated REMOVE message and respond accordingly. Returns
* zero on success, negative values on failure.
*
*/
static int netlbl_cipsov4_remove(struct sk_buff *skb, struct genl_info *info)
{
int ret_val;
u32 doi;
struct nlattr *msg = netlbl_netlink_payload_data(skb);
ret_val = netlbl_netlink_cap_check(skb, CAP_NET_ADMIN);
if (ret_val != 0)
goto remove_return;
if (netlbl_netlink_payload_len(skb) != NETLBL_LEN_U32) {
ret_val = -EINVAL;
goto remove_return;
}
doi = nla_get_u32(msg);
ret_val = cipso_v4_doi_remove(doi, netlbl_cipsov4_doi_free);
remove_return:
netlbl_netlink_send_ack(info,
netlbl_cipsov4_gnl_family.id,
NLBL_CIPSOV4_C_ACK,
-ret_val);
return ret_val;
}
/*
* NetLabel Generic NETLINK Command Definitions
*/
static struct genl_ops netlbl_cipsov4_genl_c_add = {
.cmd = NLBL_CIPSOV4_C_ADD,
.flags = 0,
.doit = netlbl_cipsov4_add,
.dumpit = NULL,
};
static struct genl_ops netlbl_cipsov4_genl_c_remove = {
.cmd = NLBL_CIPSOV4_C_REMOVE,
.flags = 0,
.doit = netlbl_cipsov4_remove,
.dumpit = NULL,
};
static struct genl_ops netlbl_cipsov4_genl_c_list = {
.cmd = NLBL_CIPSOV4_C_LIST,
.flags = 0,
.doit = netlbl_cipsov4_list,
.dumpit = NULL,
};
static struct genl_ops netlbl_cipsov4_genl_c_listall = {
.cmd = NLBL_CIPSOV4_C_LISTALL,
.flags = 0,
.doit = netlbl_cipsov4_listall,
.dumpit = NULL,
};
/*
* NetLabel Generic NETLINK Protocol Functions
*/
/**
* netlbl_cipsov4_genl_init - Register the CIPSOv4 NetLabel component
*
* Description:
* Register the CIPSOv4 packet NetLabel component with the Generic NETLINK
* mechanism. Returns zero on success, negative values on failure.
*
*/
int netlbl_cipsov4_genl_init(void)
{
int ret_val;
ret_val = genl_register_family(&netlbl_cipsov4_gnl_family);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
&netlbl_cipsov4_genl_c_add);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
&netlbl_cipsov4_genl_c_remove);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
&netlbl_cipsov4_genl_c_list);
if (ret_val != 0)
return ret_val;
ret_val = genl_register_ops(&netlbl_cipsov4_gnl_family,
&netlbl_cipsov4_genl_c_listall);
if (ret_val != 0)
return ret_val;
return 0;
}
