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

/*
 * Copyright (c) 2014, Ericsson AB
 * 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>
#include <linux/tipc_config.h>

static int handle_cmd(struct sk_buff *skb, struct genl_info *info)
{
	struct net *net = genl_info_net(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_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
	u16 cmd;

	if ((req_userhdr->cmd & 0xC000) &&
	    (!netlink_net_capable(skb, CAP_NET_ADMIN)))
		cmd = TIPC_CMD_NOT_NET_ADMIN;
	else
		cmd = req_userhdr->cmd;

	rep_buf = tipc_cfg_do_cmd(net, req_userhdr->dest, cmd,
				  nlmsg_data(req_nlh) + GENL_HDRLEN +
				  TIPC_GENL_HDRLEN,
				  nlmsg_attrlen(req_nlh, GENL_HDRLEN +
				  TIPC_GENL_HDRLEN), hdr_space);

	if (rep_buf) {
		skb_push(rep_buf, hdr_space);
		rep_nlh = nlmsg_hdr(rep_buf);
		memcpy(rep_nlh, req_nlh, hdr_space);
		rep_nlh->nlmsg_len = rep_buf->len;
		genlmsg_unicast(net, rep_buf, NETLINK_CB(skb).portid);
	}

	return 0;
}

static struct genl_family tipc_genl_compat_family = {
	.id		= GENL_ID_GENERATE,
	.name		= TIPC_GENL_NAME,
	.version	= TIPC_GENL_VERSION,
	.hdrsize	= TIPC_GENL_HDRLEN,
	.maxattr	= 0,
	.netnsok	= true,
};

static struct genl_ops tipc_genl_compat_ops[] = {
	{
		.cmd		= TIPC_GENL_CMD,
		.doit		= handle_cmd,
	},
};

int tipc_netlink_compat_start(void)
{
	int res;

	res = genl_register_family_with_ops(&tipc_genl_compat_family,
					    tipc_genl_compat_ops);
	if (res) {
		pr_err("Failed to register legacy compat interface\n");
		return res;
	}

	return 0;
}

void tipc_netlink_compat_stop(void)
{
	genl_unregister_family(&tipc_genl_compat_family);
}
Commit	Line	Data
bfb3e5dd RA	1	/*
	2	* Copyright (c) 2014, Ericsson AB
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions are met:
	7	*
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. Neither the names of the copyright holders nor the names of its
	14	* contributors may be used to endorse or promote products derived from
	15	* this software without specific prior written permission.
	16	*
	17	* Alternatively, this software may be distributed under the terms of the
	18	* GNU General Public License ("GPL") version 2 as published by the Free
	19	* Software Foundation.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	22	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	25	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	26	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	27	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	28	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	29	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	30	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	31	* POSSIBILITY OF SUCH DAMAGE.
	32	*/
	33
	34	#include "core.h"
	35	#include "config.h"
	36	#include <net/genetlink.h>
	37	#include <linux/tipc_config.h>
	38
	39	static int handle_cmd(struct sk_buff skb, struct genl_info info)
	40	{
	41	struct net *net = genl_info_net(info);
	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;
	46	int hdr_space = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
	47	u16 cmd;
	48
	49	if ((req_userhdr->cmd & 0xC000) &&
	50	(!netlink_net_capable(skb, 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(net, req_userhdr->dest, cmd,
	56	nlmsg_data(req_nlh) + GENL_HDRLEN +
	57	TIPC_GENL_HDRLEN,
	58	nlmsg_attrlen(req_nlh, GENL_HDRLEN +
	59	TIPC_GENL_HDRLEN), hdr_space);
	60
	61	if (rep_buf) {
	62	skb_push(rep_buf, hdr_space);
	63	rep_nlh = nlmsg_hdr(rep_buf);
	64	memcpy(rep_nlh, req_nlh, hdr_space);
65	rep_nlh->nlmsg_len = rep_buf->len;
66	genlmsg_unicast(net, rep_buf, NETLINK_CB(skb).portid);
67	}
68
69	return 0;
70	}
71
72	static struct genl_family tipc_genl_compat_family = {
73	.id = GENL_ID_GENERATE,
74	.name = TIPC_GENL_NAME,
75	.version = TIPC_GENL_VERSION,
76	.hdrsize = TIPC_GENL_HDRLEN,
77	.maxattr = 0,
78	.netnsok = true,
79	};
80
81	static struct genl_ops tipc_genl_compat_ops[] = {
82	{
83	.cmd = TIPC_GENL_CMD,
84	.doit = handle_cmd,
85	},
86	};
87
88	int tipc_netlink_compat_start(void)
89	{
90	int res;
91
92	res = genl_register_family_with_ops(&tipc_genl_compat_family,
93	tipc_genl_compat_ops);
94	if (res) {
95	pr_err("Failed to register legacy compat interface\n");
96	return res;
97	}
98
99	return 0;
100	}
101
102	void tipc_netlink_compat_stop(void)
103	{
104	genl_unregister_family(&tipc_genl_compat_family);
105	}