mirror of
https://github.com/torvalds/linux.git
synced 2024-11-02 18:21:49 +00:00
d387f6ad10
Adds nlmsg_notify() implementing proper notification logic. The message is multicasted to all listeners in the group. The applications the requests orignates from can request a unicast back report in which case said socket will be excluded from the multicast to avoid duplicated notifications. nlmsg_multicast() is extended to take allocation flags to allow notification in atomic contexts. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
159 lines
3.7 KiB
C
159 lines
3.7 KiB
C
/*
|
|
* 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);
|
|
}
|