/*
* NetLabel NETLINK Interface
*
* This file defines the NETLINK interface 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/init.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/socket.h>
#include <net/sock.h>
#include <net/netlink.h>
#include <net/genetlink.h>
#include <net/netlabel.h>
#include <asm/bug.h>
#include "netlabel_mgmt.h"
#include "netlabel_unlabeled.h"
#include "netlabel_cipso_v4.h"
#include "netlabel_user.h"
/*
* NetLabel NETLINK Setup Functions
*/
/**
* netlbl_netlink_init - Initialize the NETLINK communication channel
*
* Description:
* Call out to the NetLabel components so they can register their families and
* commands with the Generic NETLINK mechanism. Returns zero on success and
* non-zero on failure.
*
*/
int netlbl_netlink_init(void)
{
int ret_val;
ret_val = netlbl_mgmt_genl_init();
if (ret_val != 0)
return ret_val;
ret_val = netlbl_cipsov4_genl_init();
if (ret_val != 0)
return ret_val;
ret_val = netlbl_unlabel_genl_init();
if (ret_val != 0)
return ret_val;
return 0;
}
/*
* NetLabel Common Protocol Functions
*/
/**
* netlbl_netlink_send_ack - Send an ACK message
* @info: the generic NETLINK information
* @genl_family: the generic NETLINK family ID value
* @ack_cmd: the generic NETLINK family ACK command value
* @ret_code: return code to use
*
* Description:
* This function sends an ACK message to the sender of the NETLINK message
* specified by @info.
*
*/
void netlbl_netlink_send_ack(const struct genl_info *info,
u32 genl_family,
u8 ack_cmd,
u32 ret_code)
{
size_t data_size;
struct sk_buff *skb;
data_size = GENL_HDRLEN + 2 * NETLBL_LEN_U32;
skb = netlbl_netlink_alloc_skb(0, data_size, GFP_KERNEL);
if (skb == NULL)
return;
if (netlbl_netlink_hdr_put(skb,
info->snd_pid,
0,
genl_family,
ack_cmd) == NULL)
goto send_ack_failure;
if (nla_put_u32(skb, NLA_U32, info->snd_seq) != 0)
goto send_ack_failure;
if (nla_put_u32(skb, NLA_U32, ret_code) != 0)
goto send_ack_failure;
netlbl_netlink_snd(skb, info->snd_pid);
return;
send_ack_failure:
kfree_skb(skb);
}
/*
* NETLINK I/O Functions
*/
/**
* netlbl_netlink_snd - Send a NetLabel message
* @skb: NetLabel message
* @pid: destination PID
*
* Description:
* Sends a unicast NetLabel message over the NETLINK socket.
*
*/
int netlbl_netlink_snd(struct sk_buff *skb, u32 pid)
{
return genlmsg_unicast(skb, pid);
}
/**
* netlbl_netlink_snd - Send a NetLabel message
* @skb: NetLabel message
* @pid: sending PID
* @group: multicast group id
*
* Description:
* Sends a multicast NetLabel message over the NETLINK socket to all members
* of @group except @pid.
*
*/
int netlbl_netlink_snd_multicast(struct sk_buff *skb, u32 pid, u32 group)
{
return genlmsg_multicast(skb, pid, group, GFP_KERNEL);
}
