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
/*
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* NetLabel NETLINK Interface
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*
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* This file defines the NETLINK interface for the NetLabel system. The
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* NetLabel system manages static and dynamic label mappings for network
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* protocols such as CIPSO and RIPSO.
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*
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* Author: Paul Moore <paul.moore@hp.com>
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*
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/socket.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include <net/netlabel.h>
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#include <asm/bug.h>
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#include "netlabel_mgmt.h"
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#include "netlabel_unlabeled.h"
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#include "netlabel_cipso_v4.h"
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#include "netlabel_user.h"
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/*
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* NetLabel NETLINK Setup Functions
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*/
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/**
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* netlbl_netlink_init - Initialize the NETLINK communication channel
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*
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* Description:
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* Call out to the NetLabel components so they can register their families and
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* commands with the Generic NETLINK mechanism. Returns zero on success and
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* non-zero on failure.
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*
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*/
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int netlbl_netlink_init(void)
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{
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int ret_val;
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ret_val = netlbl_mgmt_genl_init();
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if (ret_val != 0)
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return ret_val;
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ret_val = netlbl_cipsov4_genl_init();
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if (ret_val != 0)
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return ret_val;
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ret_val = netlbl_unlabel_genl_init();
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if (ret_val != 0)
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return ret_val;
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return 0;
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}
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/*
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* NetLabel Common Protocol Functions
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*/
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/**
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* netlbl_netlink_send_ack - Send an ACK message
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* @info: the generic NETLINK information
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* @genl_family: the generic NETLINK family ID value
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* @ack_cmd: the generic NETLINK family ACK command value
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* @ret_code: return code to use
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*
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* Description:
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* This function sends an ACK message to the sender of the NETLINK message
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* specified by @info.
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*
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*/
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void netlbl_netlink_send_ack(const struct genl_info *info,
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u32 genl_family,
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u8 ack_cmd,
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u32 ret_code)
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{
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size_t data_size;
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struct sk_buff *skb;
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data_size = GENL_HDRLEN + 2 * NETLBL_LEN_U32;
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skb = netlbl_netlink_alloc_skb(0, data_size, GFP_KERNEL);
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if (skb == NULL)
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return;
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if (netlbl_netlink_hdr_put(skb,
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info->snd_pid,
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0,
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genl_family,
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ack_cmd) == NULL)
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goto send_ack_failure;
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if (nla_put_u32(skb, NLA_U32, info->snd_seq) != 0)
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goto send_ack_failure;
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if (nla_put_u32(skb, NLA_U32, ret_code) != 0)
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goto send_ack_failure;
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netlbl_netlink_snd(skb, info->snd_pid);
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return;
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send_ack_failure:
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kfree_skb(skb);
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}
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/*
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* NETLINK I/O Functions
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*/
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/**
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* netlbl_netlink_snd - Send a NetLabel message
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* @skb: NetLabel message
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* @pid: destination PID
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*
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* Description:
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* Sends a unicast NetLabel message over the NETLINK socket.
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*
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*/
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int netlbl_netlink_snd(struct sk_buff *skb, u32 pid)
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{
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return genlmsg_unicast(skb, pid);
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}
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/**
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* netlbl_netlink_snd - Send a NetLabel message
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* @skb: NetLabel message
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* @pid: sending PID
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* @group: multicast group id
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*
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* Description:
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* Sends a multicast NetLabel message over the NETLINK socket to all members
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* of @group except @pid.
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*
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*/
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int netlbl_netlink_snd_multicast(struct sk_buff *skb, u32 pid, u32 group)
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{
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return genlmsg_multicast(skb, pid, group, GFP_KERNEL);
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}
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