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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/netlink.c: TIPC configuration handling
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden593a5f22006-01-11 19:14:19 +01004 * Copyright (c) 2005-2006, Ericsson AB
Allan Stephens59f0c452008-05-21 14:52:30 -07005 * Copyright (c) 2005-2007, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * 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;
Hong zhi guo573ce262013-03-27 06:47:04 +000047 int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
Allan Stephens59f0c452008-05-21 14:52:30 -070048 u16 cmd;
Per Lidenb97bf3f2006-01-02 19:04:38 +010049
50 if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
Allan Stephens59f0c452008-05-21 14:52:30 -070051 cmd = TIPC_CMD_NOT_NET_ADMIN;
Per Lidenb97bf3f2006-01-02 19:04:38 +010052 else
Allan Stephens59f0c452008-05-21 14:52:30 -070053 cmd = req_userhdr->cmd;
54
55 rep_buf = tipc_cfg_do_cmd(req_userhdr->dest, cmd,
Hong zhi guo573ce262013-03-27 06:47:04 +000056 nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
57 nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
Allan Stephens59f0c452008-05-21 14:52:30 -070058 hdr_space);
Per Lidenb97bf3f2006-01-02 19:04:38 +010059
60 if (rep_buf) {
61 skb_push(rep_buf, hdr_space);
Arnaldo Carvalho de Melob529ccf2007-04-25 19:08:35 -070062 rep_nlh = nlmsg_hdr(rep_buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +010063 memcpy(rep_nlh, req_nlh, hdr_space);
64 rep_nlh->nlmsg_len = rep_buf->len;
Eric W. Biederman15e47302012-09-07 20:12:54 +000065 genlmsg_unicast(&init_net, rep_buf, NETLINK_CB(skb).portid);
Per Lidenb97bf3f2006-01-02 19:04:38 +010066 }
67
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090068 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +010069}
70
Michał Mirosławacb0a202009-05-21 10:34:05 +000071static struct genl_family tipc_genl_family = {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090072 .id = GENL_ID_GENERATE,
73 .name = TIPC_GENL_NAME,
74 .version = TIPC_GENL_VERSION,
75 .hdrsize = TIPC_GENL_HDRLEN,
76 .maxattr = 0,
Per Lidenb97bf3f2006-01-02 19:04:38 +010077};
78
Johannes Bergc53ed742013-11-19 15:19:31 +010079static struct genl_ops tipc_genl_ops[] = {
80 {
81 .cmd = TIPC_GENL_CMD,
82 .doit = handle_cmd,
83 },
Per Lidenb97bf3f2006-01-02 19:04:38 +010084};
85
Michał Mirosławacb0a202009-05-21 10:34:05 +000086static int tipc_genl_family_registered;
Per Lidenb97bf3f2006-01-02 19:04:38 +010087
Per Liden4323add2006-01-18 00:38:21 +010088int tipc_netlink_start(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +010089{
Michał Mirosławacb0a202009-05-21 10:34:05 +000090 int res;
Jon Maloyb70e4f42006-01-10 18:54:24 +000091
Johannes Bergc53ed742013-11-19 15:19:31 +010092 res = genl_register_family_with_ops(&tipc_genl_family, tipc_genl_ops);
Michał Mirosławacb0a202009-05-21 10:34:05 +000093 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -040094 pr_err("Failed to register netlink interface\n");
Michał Mirosławacb0a202009-05-21 10:34:05 +000095 return res;
96 }
Jon Maloyb70e4f42006-01-10 18:54:24 +000097
Michał Mirosławacb0a202009-05-21 10:34:05 +000098 tipc_genl_family_registered = 1;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090099 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100}
101
Per Liden4323add2006-01-18 00:38:21 +0100102void tipc_netlink_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100103{
Michał Mirosławacb0a202009-05-21 10:34:05 +0000104 if (!tipc_genl_family_registered)
105 return;
106
107 genl_unregister_family(&tipc_genl_family);
108 tipc_genl_family_registered = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100109}