Root/net/tipc/netlink.c

1/*
2 * net/tipc/netlink.c: TIPC configuration handling
3 *
4 * Copyright (c) 2005-2006, Ericsson AB
5 * Copyright (c) 2005-2007, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "config.h"
39#include <net/genetlink.h>
40
41static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
42{
43    struct sk_buff *rep_buf;
44    struct nlmsghdr *rep_nlh;
45    struct nlmsghdr *req_nlh = info->nlhdr;
46    struct tipc_genlmsghdr *req_userhdr = info->userhdr;
47    int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN);
48    u16 cmd;
49
50    if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
51        cmd = TIPC_CMD_NOT_NET_ADMIN;
52    else
53        cmd = req_userhdr->cmd;
54
55    rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd,
56            NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
57            NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
58            hdr_space);
59
60    if (rep_buf) {
61        skb_push(rep_buf, hdr_space);
62        rep_nlh = nlmsg_hdr(rep_buf);
63        memcpy(rep_nlh, req_nlh, hdr_space);
64        rep_nlh->nlmsg_len = rep_buf->len;
65        genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).pid);
66    }
67
68    return 0;
69}
70
71static struct genl_family tipc_genl_family = {
72    .id = GENL_ID_GENERATE,
73    .name = TIPC_GENL_NAME,
74    .version = TIPC_GENL_VERSION,
75    .hdrsize = TIPC_GENL_HDRLEN,
76    .maxattr = 0,
77};
78
79static struct genl_ops tipc_genl_ops = {
80    .cmd = TIPC_GENL_CMD,
81    .doit = handle_cmd,
82};
83
84static int tipc_genl_family_registered;
85
86int tipc_netlink_start(void)
87{
88    int res;
89
90    res = genl_register_family_with_ops(&tipc_genl_family,
91        &tipc_genl_ops, 1);
92    if (res) {
93        err("Failed to register netlink interface\n");
94        return res;
95    }
96
97    tipc_genl_family_registered = 1;
98    return 0;
99}
100
101void tipc_netlink_stop(void)
102{
103    if (!tipc_genl_family_registered)
104        return;
105
106    genl_unregister_family(&tipc_genl_family);
107    tipc_genl_family_registered = 0;
108}
109

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