[deliverable/linux.git] / net / tipc / netlink.c

/*
 * net/tipc/netlink.c: TIPC configuration handling
 * 
 * Copyright (c) 2005, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "config.h"
#include <net/genetlink.h>

static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *rep_buf;
	struct nlmsghdr *rep_nlh;
	struct nlmsghdr *req_nlh = info->nlhdr;
	struct tipc_genlmsghdr *req_userhdr = info->userhdr;
	int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN);

	if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
		rep_buf = cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
	else
		rep_buf = cfg_do_cmd(req_userhdr->dest,
				     req_userhdr->cmd,
				     NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
				     NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
				     hdr_space);

	if (rep_buf) {
		skb_push(rep_buf, hdr_space);
		rep_nlh = (struct nlmsghdr *)rep_buf->data;
		memcpy(rep_nlh, req_nlh, hdr_space);
		rep_nlh->nlmsg_len = rep_buf->len;
		genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid);
	}

        return 0;
}

static struct genl_family family = {
        .id		= GENL_ID_GENERATE,
        .name		= TIPC_GENL_NAME,
        .version	= TIPC_GENL_VERSION,
        .hdrsize	= TIPC_GENL_HDRLEN,
        .maxattr	= 0,
	.owner		= THIS_MODULE,
};

static struct genl_ops ops = {
	.cmd		= TIPC_GENL_CMD,
	.doit		= handle_cmd,
};

static int family_registered = 0;

int netlink_start(void)
{


	if (genl_register_family(&family))
		goto err;

	family_registered = 1;

	if (genl_register_ops(&family, &ops))
		goto err_unregister;

        return 0;

 err_unregister:
	genl_unregister_family(&family);
	family_registered = 0;
 err:
	err("Failed to register netlink interface\n");
	return -EFAULT;
}

void netlink_stop(void)
{
	if (family_registered) {
		genl_unregister_family(&family);
		family_registered = 0;
	}
}
Commit	Line	Data
b97bf3fd PL	1	/*
	2	* net/tipc/netlink.c: TIPC configuration handling
	3	*
	4	* Copyright (c) 2005, Wind River Systems
b97bf3fd PL	5	* All rights reserved.
b97bf3fd PL	6	*
9ea1fd3c	7	* Redistribution and use in source and binary forms, with or without
b97bf3fd PL	8	* modification, are permitted provided that the following conditions are met:
b97bf3fd PL	9	*
9ea1fd3c PL	10	* 1. Redistributions of source code must retain the above copyright
	11	* notice, this list of conditions and the following disclaimer.
	12	* 2. Redistributions in binary form must reproduce the above copyright
	13	* notice, this list of conditions and the following disclaimer in the
	14	* documentation and/or other materials provided with the distribution.
	15	* 3. Neither the names of the copyright holders nor the names of its
	16	* contributors may be used to endorse or promote products derived from
	17	* this software without specific prior written permission.
b97bf3fd	18	*
9ea1fd3c PL	19	* Alternatively, this software may be distributed under the terms of the
	20	* GNU General Public License ("GPL") version 2 as published by the Free
	21	* Software Foundation.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	24	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	27	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	28	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	29	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	30	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	31	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	32	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
b97bf3fd PL	33	* POSSIBILITY OF SUCH DAMAGE.
	34	*/
	35
	36	#include "core.h"
	37	#include "config.h"
	38	#include <net/genetlink.h>
	39
	40	static int handle_cmd(struct sk_buff skb, struct genl_info info)
	41	{
	42	struct sk_buff *rep_buf;
	43	struct nlmsghdr *rep_nlh;
	44	struct nlmsghdr *req_nlh = info->nlhdr;
	45	struct tipc_genlmsghdr *req_userhdr = info->userhdr;
1dba9743	46	int hdr_space = NLMSG_SPACE(GENL_HDRLEN + TIPC_GENL_HDRLEN);
b97bf3fd PL	47
	48	if ((req_userhdr->cmd & 0xC000) && (!capable(CAP_NET_ADMIN)))
	49	rep_buf = cfg_reply_error_string(TIPC_CFG_NOT_NET_ADMIN);
	50	else
	51	rep_buf = cfg_do_cmd(req_userhdr->dest,
	52	req_userhdr->cmd,
	53	NLMSG_DATA(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN,
	54	NLMSG_PAYLOAD(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN),
	55	hdr_space);
	56
	57	if (rep_buf) {
	58	skb_push(rep_buf, hdr_space);
	59	rep_nlh = (struct nlmsghdr *)rep_buf->data;
	60	memcpy(rep_nlh, req_nlh, hdr_space);
	61	rep_nlh->nlmsg_len = rep_buf->len;
	62	genlmsg_unicast(rep_buf, req_nlh->nlmsg_pid);
	63	}
	64
	65	return 0;
	66	}
	67
	68	static struct genl_family family = {
1dba9743	69	.id = GENL_ID_GENERATE,
b97bf3fd PL	70	.name = TIPC_GENL_NAME,
	71	.version = TIPC_GENL_VERSION,
	72	.hdrsize = TIPC_GENL_HDRLEN,
	73	.maxattr = 0,
	74	.owner = THIS_MODULE,
	75	};
	76
	77	static struct genl_ops ops = {
	78	.cmd = TIPC_GENL_CMD,
	79	.doit = handle_cmd,
	80	};
	81
	82	static int family_registered = 0;
	83
	84	int netlink_start(void)
	85	{
b70e4f45 JM	86
b70e4f45 JM	87
b97bf3fd PL	88	if (genl_register_family(&family))
	89	goto err;
	90
	91	family_registered = 1;
	92
	93	if (genl_register_ops(&family, &ops))
	94	goto err_unregister;
	95
b70e4f45	96	return 0;
b97bf3fd PL	97
	98	err_unregister:
	99	genl_unregister_family(&family);
	100	family_registered = 0;
	101	err:
d0a14a9d	102	err("Failed to register netlink interface\n");
b97bf3fd PL	103	return -EFAULT;
	104	}
	105
	106	void netlink_stop(void)
	107	{
	108	if (family_registered) {
	109	genl_unregister_family(&family);
	110	family_registered = 0;
	111	}
	112	}