net/batman-adv/netlink.c - linux - Git at Google

 /* Copyright (C) 2016 B.A.T.M.A.N. contributors:
  *
  * Matthias Schiffer
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
  * License as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  * General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */

 #include "netlink.h"
 #include "main.h"

 #include <linux/atomic.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
 #include <linux/genetlink.h>
 #include <linux/if_ether.h>
 #include <linux/init.h>
 #include <linux/netdevice.h>
 #include <linux/netlink.h>
 #include <linux/printk.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/skbuff.h>
 #include <linux/stddef.h>
 #include <linux/types.h>
 #include <net/genetlink.h>
 #include <net/netlink.h>
 #include <net/sock.h>
 #include <uapi/linux/batman_adv.h>

 #include "bat_algo.h"
 #include "hard-interface.h"
 #include "originator.h"
 #include "soft-interface.h"
 #include "tp_meter.h"
 #include "translation-table.h"

 struct genl_family batadv_netlink_family = {
 	.id = GENL_ID_GENERATE,
 	.hdrsize = 0,
 	.name = BATADV_NL_NAME,
 	.version = 1,
 	.maxattr = BATADV_ATTR_MAX,
 };

 /* multicast groups */
 enum batadv_netlink_multicast_groups {
 	BATADV_NL_MCGRP_TPMETER,
 };

 static struct genl_multicast_group batadv_netlink_mcgrps[] = {
 	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
 };

 static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
 	[BATADV_ATTR_VERSION]		= { .type = NLA_STRING },
 	[BATADV_ATTR_ALGO_NAME]		= { .type = NLA_STRING },
 	[BATADV_ATTR_MESH_IFINDEX]	= { .type = NLA_U32 },
 	[BATADV_ATTR_MESH_IFNAME]	= { .type = NLA_STRING },
 	[BATADV_ATTR_MESH_ADDRESS]	= { .len = ETH_ALEN },
 	[BATADV_ATTR_HARD_IFINDEX]	= { .type = NLA_U32 },
 	[BATADV_ATTR_HARD_IFNAME]	= { .type = NLA_STRING },
 	[BATADV_ATTR_HARD_ADDRESS]	= { .len = ETH_ALEN },
 	[BATADV_ATTR_ORIG_ADDRESS]	= { .len = ETH_ALEN },
 	[BATADV_ATTR_TPMETER_RESULT]	= { .type = NLA_U8 },
 	[BATADV_ATTR_TPMETER_TEST_TIME]	= { .type = NLA_U32 },
 	[BATADV_ATTR_TPMETER_BYTES]	= { .type = NLA_U64 },
 	[BATADV_ATTR_TPMETER_COOKIE]	= { .type = NLA_U32 },
 	[BATADV_ATTR_ACTIVE]		= { .type = NLA_FLAG },
 	[BATADV_ATTR_TT_ADDRESS]	= { .len = ETH_ALEN },
 	[BATADV_ATTR_TT_TTVN]		= { .type = NLA_U8 },
 	[BATADV_ATTR_TT_LAST_TTVN]	= { .type = NLA_U8 },
 	[BATADV_ATTR_TT_CRC32]		= { .type = NLA_U32 },
 	[BATADV_ATTR_TT_VID]		= { .type = NLA_U16 },
 	[BATADV_ATTR_TT_FLAGS]		= { .type = NLA_U32 },
 	[BATADV_ATTR_FLAG_BEST]		= { .type = NLA_FLAG },
 	[BATADV_ATTR_LAST_SEEN_MSECS]	= { .type = NLA_U32 },
 	[BATADV_ATTR_NEIGH_ADDRESS]	= { .len = ETH_ALEN },
 	[BATADV_ATTR_TQ]		= { .type = NLA_U8 },
 	[BATADV_ATTR_THROUGHPUT]	= { .type = NLA_U32 },
 };

 /**
  * batadv_netlink_get_ifindex - Extract an interface index from a message
  * @nlh: Message header
  * @attrtype: Attribute which holds an interface index
  *
  * Return: interface index, or 0.
  */
 int
 batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
 {
 	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);

 	return attr ? nla_get_u32(attr) : 0;
 }

 /**
  * batadv_netlink_mesh_info_put - fill in generic information about mesh
  *  interface
  * @msg: netlink message to be sent back
  * @soft_iface: interface for which the data should be taken
  *
  * Return: 0 on success, < 0 on error
  */
 static int
 batadv_netlink_mesh_info_put(struct sk_buff *msg, struct net_device *soft_iface)
 {
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	struct batadv_hard_iface *primary_if = NULL;
 	struct net_device *hard_iface;
 	int ret = -ENOBUFS;

 	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
 	    nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
 			   bat_priv->algo_ops->name) ||
 	    nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
 	    nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
 	    nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
 		    soft_iface->dev_addr) ||
 	    nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
 		       (u8)atomic_read(&bat_priv->tt.vn)))
 		goto out;

 	primary_if = batadv_primary_if_get_selected(bat_priv);
 	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
 		hard_iface = primary_if->net_dev;

 		if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 				hard_iface->ifindex) ||
 		    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
 				   hard_iface->name) ||
 		    nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
 			    hard_iface->dev_addr))
 			goto out;
 	}

 	ret = 0;

  out:
 	if (primary_if)
 		batadv_hardif_put(primary_if);

 	return ret;
 }

 /**
  * batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
  *  netlink request
  * @skb: received netlink message
  * @info: receiver information
  *
  * Return: 0 on success, < 0 on error
  */
 static int
 batadv_netlink_get_mesh_info(struct sk_buff *skb, struct genl_info *info)
 {
 	struct net *net = genl_info_net(info);
 	struct net_device *soft_iface;
 	struct sk_buff *msg = NULL;
 	void *msg_head;
 	int ifindex;
 	int ret;

 	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
 		return -EINVAL;

 	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
 	if (!ifindex)
 		return -EINVAL;

 	soft_iface = dev_get_by_index(net, ifindex);
 	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
 		ret = -ENODEV;
 		goto out;
 	}

 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
 			       &batadv_netlink_family, 0,
 			       BATADV_CMD_GET_MESH_INFO);
 	if (!msg_head) {
 		ret = -ENOBUFS;
 		goto out;
 	}

 	ret = batadv_netlink_mesh_info_put(msg, soft_iface);

  out:
 	if (soft_iface)
 		dev_put(soft_iface);

 	if (ret) {
 		if (msg)
 			nlmsg_free(msg);
 		return ret;
 	}

 	genlmsg_end(msg, msg_head);
 	return genlmsg_reply(msg, info);
 }

 /**
  * batadv_netlink_tp_meter_put - Fill information of started tp_meter session
  * @msg: netlink message to be sent back
  * @cookie: tp meter session cookie
  *
  *  Return: 0 on success, < 0 on error
  */
 static int
 batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
 {
 	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
 		return -ENOBUFS;

 	return 0;
 }

 /**
  * batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
  * @bat_priv: the bat priv with all the soft interface information
  * @dst: destination of tp_meter session
  * @result: reason for tp meter session stop
  * @test_time: total time ot the tp_meter session
  * @total_bytes: bytes acked to the receiver
  * @cookie: cookie of tp_meter session
  *
  * Return: 0 on success, < 0 on error
  */
 int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
 				  u8 result, u32 test_time, u64 total_bytes,
 				  u32 cookie)
 {
 	struct sk_buff *msg;
 	void *hdr;
 	int ret;

 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg)
 		return -ENOMEM;

 	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
 			  BATADV_CMD_TP_METER);
 	if (!hdr) {
 		ret = -ENOBUFS;
 		goto err_genlmsg;
 	}

 	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
 		goto nla_put_failure;

 	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
 		goto nla_put_failure;

 	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
 			      BATADV_ATTR_PAD))
 		goto nla_put_failure;

 	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
 		goto nla_put_failure;

 	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
 		goto nla_put_failure;

 	genlmsg_end(msg, hdr);

 	genlmsg_multicast_netns(&batadv_netlink_family,
 				dev_net(bat_priv->soft_iface), msg, 0,
 				BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);

 	return 0;

 nla_put_failure:
 	genlmsg_cancel(msg, hdr);
 	ret = -EMSGSIZE;

 err_genlmsg:
 	nlmsg_free(msg);
 	return ret;
 }

 /**
  * batadv_netlink_tp_meter_start - Start a new tp_meter session
  * @skb: received netlink message
  * @info: receiver information
  *
  * Return: 0 on success, < 0 on error
  */
 static int
 batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
 {
 	struct net *net = genl_info_net(info);
 	struct net_device *soft_iface;
 	struct batadv_priv *bat_priv;
 	struct sk_buff *msg = NULL;
 	u32 test_length;
 	void *msg_head;
 	int ifindex;
 	u32 cookie;
 	u8 *dst;
 	int ret;

 	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
 		return -EINVAL;

 	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
 		return -EINVAL;

 	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
 		return -EINVAL;

 	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
 	if (!ifindex)
 		return -EINVAL;

 	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);

 	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);

 	soft_iface = dev_get_by_index(net, ifindex);
 	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
 		ret = -ENODEV;
 		goto out;
 	}

 	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!msg) {
 		ret = -ENOMEM;
 		goto out;
 	}

 	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
 			       &batadv_netlink_family, 0,
 			       BATADV_CMD_TP_METER);
 	if (!msg_head) {
 		ret = -ENOBUFS;
 		goto out;
 	}

 	bat_priv = netdev_priv(soft_iface);
 	batadv_tp_start(bat_priv, dst, test_length, &cookie);

 	ret = batadv_netlink_tp_meter_put(msg, cookie);

  out:
 	if (soft_iface)
 		dev_put(soft_iface);

 	if (ret) {
 		if (msg)
 			nlmsg_free(msg);
 		return ret;
 	}

 	genlmsg_end(msg, msg_head);
 	return genlmsg_reply(msg, info);
 }

 /**
  * batadv_netlink_tp_meter_start - Cancel a running tp_meter session
  * @skb: received netlink message
  * @info: receiver information
  *
  * Return: 0 on success, < 0 on error
  */
 static int
 batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
 {
 	struct net *net = genl_info_net(info);
 	struct net_device *soft_iface;
 	struct batadv_priv *bat_priv;
 	int ifindex;
 	u8 *dst;
 	int ret = 0;

 	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
 		return -EINVAL;

 	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
 		return -EINVAL;

 	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
 	if (!ifindex)
 		return -EINVAL;

 	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);

 	soft_iface = dev_get_by_index(net, ifindex);
 	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
 		ret = -ENODEV;
 		goto out;
 	}

 	bat_priv = netdev_priv(soft_iface);
 	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);

 out:
 	if (soft_iface)
 		dev_put(soft_iface);

 	return ret;
 }

 /**
  * batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
  * @msg: Netlink message to dump into
  * @portid: Port making netlink request
  * @seq: Sequence number of netlink message
  * @hard_iface: Hard interface to dump
  *
  * Return: error code, or 0 on success
  */
 static int
 batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
 				 struct batadv_hard_iface *hard_iface)
 {
 	struct net_device *net_dev = hard_iface->net_dev;
 	void *hdr;

 	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
 			  BATADV_CMD_GET_HARDIFS);
 	if (!hdr)
 		return -EMSGSIZE;

 	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
 			net_dev->ifindex) ||
 	    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
 			   net_dev->name) ||
 	    nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
 		    net_dev->dev_addr))
 		goto nla_put_failure;

 	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
 		if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
 			goto nla_put_failure;
 	}

 	genlmsg_end(msg, hdr);
 	return 0;

  nla_put_failure:
 	genlmsg_cancel(msg, hdr);
 	return -EMSGSIZE;
 }

 /**
  * batadv_netlink_dump_hardifs - Dump all hard interface into a messages
  * @msg: Netlink message to dump into
  * @cb: Parameters from query
  *
  * Return: error code, or length of reply message on success
  */
 static int
 batadv_netlink_dump_hardifs(struct sk_buff *msg, struct netlink_callback *cb)
 {
 	struct net *net = sock_net(cb->skb->sk);
 	struct net_device *soft_iface;
 	struct batadv_hard_iface *hard_iface;
 	int ifindex;
 	int portid = NETLINK_CB(cb->skb).portid;
 	int seq = cb->nlh->nlmsg_seq;
 	int skip = cb->args[0];
 	int i = 0;

 	ifindex = batadv_netlink_get_ifindex(cb->nlh,
 					     BATADV_ATTR_MESH_IFINDEX);
 	if (!ifindex)
 		return -EINVAL;

 	soft_iface = dev_get_by_index(net, ifindex);
 	if (!soft_iface)
 		return -ENODEV;

 	if (!batadv_softif_is_valid(soft_iface)) {
 		dev_put(soft_iface);
 		return -ENODEV;
 	}

 	rcu_read_lock();

 	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
 		if (hard_iface->soft_iface != soft_iface)
 			continue;

 		if (i++ < skip)
 			continue;

 		if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
 						     hard_iface)) {
 			i--;
 			break;
 		}
 	}

 	rcu_read_unlock();

 	dev_put(soft_iface);

 	cb->args[0] = i;

 	return msg->len;
 }

 static struct genl_ops batadv_netlink_ops[] = {
 	{
 		.cmd = BATADV_CMD_GET_MESH_INFO,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.doit = batadv_netlink_get_mesh_info,
 	},
 	{
 		.cmd = BATADV_CMD_TP_METER,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.doit = batadv_netlink_tp_meter_start,
 	},
 	{
 		.cmd = BATADV_CMD_TP_METER_CANCEL,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.doit = batadv_netlink_tp_meter_cancel,
 	},
 	{
 		.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.dumpit = batadv_algo_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_HARDIFS,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.dumpit = batadv_netlink_dump_hardifs,
 	},
 	{
 		.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.dumpit = batadv_tt_local_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.dumpit = batadv_tt_global_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_ORIGINATORS,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.dumpit = batadv_orig_dump,
 	},
 	{
 		.cmd = BATADV_CMD_GET_NEIGHBORS,
 		.flags = GENL_ADMIN_PERM,
 		.policy = batadv_netlink_policy,
 		.dumpit = batadv_hardif_neigh_dump,
 	},
 };

 /**
  * batadv_netlink_register - register batadv genl netlink family
  */
 void __init batadv_netlink_register(void)
 {
 	int ret;

 	ret = genl_register_family_with_ops_groups(&batadv_netlink_family,
 						   batadv_netlink_ops,
 						   batadv_netlink_mcgrps);
 	if (ret)
 		pr_warn("unable to register netlink family");
 }

 /**
  * batadv_netlink_unregister - unregister batadv genl netlink family
  */
 void batadv_netlink_unregister(void)
 {
 	genl_unregister_family(&batadv_netlink_family);
 }
	/* Copyright (C) 2016 B.A.T.M.A.N. contributors:
	*
	* Matthias Schiffer
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of version 2 of the GNU General Public
	* License as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/

	#include "netlink.h"
	#include "main.h"

	#include <linux/atomic.h>
	#include <linux/errno.h>
	#include <linux/fs.h>
	#include <linux/genetlink.h>
	#include <linux/if_ether.h>
	#include <linux/init.h>
	#include <linux/netdevice.h>
	#include <linux/netlink.h>
	#include <linux/printk.h>
	#include <linux/rculist.h>
	#include <linux/rcupdate.h>
	#include <linux/skbuff.h>
	#include <linux/stddef.h>
	#include <linux/types.h>
	#include <net/genetlink.h>
	#include <net/netlink.h>
	#include <net/sock.h>
	#include <uapi/linux/batman_adv.h>

	#include "bat_algo.h"
	#include "hard-interface.h"
	#include "originator.h"
	#include "soft-interface.h"
	#include "tp_meter.h"
	#include "translation-table.h"

	struct genl_family batadv_netlink_family = {
	.id = GENL_ID_GENERATE,
	.hdrsize = 0,
	.name = BATADV_NL_NAME,
	.version = 1,
	.maxattr = BATADV_ATTR_MAX,
	};

	/* multicast groups */
	enum batadv_netlink_multicast_groups {
	BATADV_NL_MCGRP_TPMETER,
	};

	static struct genl_multicast_group batadv_netlink_mcgrps[] = {
	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
	};

	static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
	[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
	[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
	[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
	[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
	[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
	[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
	[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
	[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
	[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
	[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
	[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
	[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
	[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
	[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
	[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
	[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
	[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
	[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
	[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
	[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
	[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
	[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
	[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
	[BATADV_ATTR_TQ] = { .type = NLA_U8 },
	[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
	};

	/**
	* batadv_netlink_get_ifindex - Extract an interface index from a message
	* @nlh: Message header
	* @attrtype: Attribute which holds an interface index
	*
	* Return: interface index, or 0.
	*/
	int
	batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
	{
	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);

	return attr ? nla_get_u32(attr) : 0;
	}

	/**
	* batadv_netlink_mesh_info_put - fill in generic information about mesh
	* interface
	* @msg: netlink message to be sent back
	* @soft_iface: interface for which the data should be taken
	*
	* Return: 0 on success, < 0 on error
	*/
	static int
	batadv_netlink_mesh_info_put(struct sk_buff msg, struct net_device soft_iface)
	{
	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	struct batadv_hard_iface *primary_if = NULL;
	struct net_device *hard_iface;
	int ret = -ENOBUFS;

	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) \|\|
	nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
	bat_priv->algo_ops->name) \|\|
	nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) \|\|
	nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) \|\|
	nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
	soft_iface->dev_addr) \|\|
	nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
	(u8)atomic_read(&bat_priv->tt.vn)))
	goto out;

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
	hard_iface = primary_if->net_dev;

	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	hard_iface->ifindex) \|\|
	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	hard_iface->name) \|\|
	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	hard_iface->dev_addr))
	goto out;
	}

	ret = 0;

	out:
	if (primary_if)
	batadv_hardif_put(primary_if);

	return ret;
	}

	/**
	* batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
	* netlink request
	* @skb: received netlink message
	* @info: receiver information
	*
	* Return: 0 on success, < 0 on error
	*/
	static int
	batadv_netlink_get_mesh_info(struct sk_buff skb, struct genl_info info)
	{
	struct net *net = genl_info_net(info);
	struct net_device *soft_iface;
	struct sk_buff *msg = NULL;
	void *msg_head;
	int ifindex;
	int ret;

	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	return -EINVAL;

	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	if (!ifindex)
	return -EINVAL;

	soft_iface = dev_get_by_index(net, ifindex);
	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	ret = -ENODEV;
	goto out;
	}

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg) {
	ret = -ENOMEM;
	goto out;
	}

	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	&batadv_netlink_family, 0,
	BATADV_CMD_GET_MESH_INFO);
	if (!msg_head) {
	ret = -ENOBUFS;
	goto out;
	}

	ret = batadv_netlink_mesh_info_put(msg, soft_iface);

	out:
	if (soft_iface)
	dev_put(soft_iface);

	if (ret) {
	if (msg)
	nlmsg_free(msg);
	return ret;
	}

	genlmsg_end(msg, msg_head);
	return genlmsg_reply(msg, info);
	}

	/**
	* batadv_netlink_tp_meter_put - Fill information of started tp_meter session
	* @msg: netlink message to be sent back
	* @cookie: tp meter session cookie
	*
	* Return: 0 on success, < 0 on error
	*/
	static int
	batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
	{
	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	return -ENOBUFS;

	return 0;
	}

	/**
	* batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
	* @bat_priv: the bat priv with all the soft interface information
	* @dst: destination of tp_meter session
	* @result: reason for tp meter session stop
	* @test_time: total time ot the tp_meter session
	* @total_bytes: bytes acked to the receiver
	* @cookie: cookie of tp_meter session
	*
	* Return: 0 on success, < 0 on error
	*/
	int batadv_netlink_tpmeter_notify(struct batadv_priv bat_priv, const u8 dst,
	u8 result, u32 test_time, u64 total_bytes,
	u32 cookie)
	{
	struct sk_buff *msg;
	void *hdr;
	int ret;

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg)
	return -ENOMEM;

	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
	BATADV_CMD_TP_METER);
	if (!hdr) {
	ret = -ENOBUFS;
	goto err_genlmsg;
	}

	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	goto nla_put_failure;

	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
	goto nla_put_failure;

	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
	BATADV_ATTR_PAD))
	goto nla_put_failure;

	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
	goto nla_put_failure;

	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
	goto nla_put_failure;

	genlmsg_end(msg, hdr);

	genlmsg_multicast_netns(&batadv_netlink_family,
	dev_net(bat_priv->soft_iface), msg, 0,
	BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);

	return 0;

	nla_put_failure:
	genlmsg_cancel(msg, hdr);
	ret = -EMSGSIZE;

	err_genlmsg:
	nlmsg_free(msg);
	return ret;
	}

	/**
	* batadv_netlink_tp_meter_start - Start a new tp_meter session
	* @skb: received netlink message
	* @info: receiver information
	*
	* Return: 0 on success, < 0 on error
	*/
	static int
	batadv_netlink_tp_meter_start(struct sk_buff skb, struct genl_info info)
	{
	struct net *net = genl_info_net(info);
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;
	struct sk_buff *msg = NULL;
	u32 test_length;
	void *msg_head;
	int ifindex;
	u32 cookie;
	u8 *dst;
	int ret;

	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	return -EINVAL;

	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
	return -EINVAL;

	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
	return -EINVAL;

	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	if (!ifindex)
	return -EINVAL;

	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);

	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);

	soft_iface = dev_get_by_index(net, ifindex);
	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	ret = -ENODEV;
	goto out;
	}

	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	if (!msg) {
	ret = -ENOMEM;
	goto out;
	}

	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	&batadv_netlink_family, 0,
	BATADV_CMD_TP_METER);
	if (!msg_head) {
	ret = -ENOBUFS;
	goto out;
	}

	bat_priv = netdev_priv(soft_iface);
	batadv_tp_start(bat_priv, dst, test_length, &cookie);

	ret = batadv_netlink_tp_meter_put(msg, cookie);

	out:
	if (soft_iface)
	dev_put(soft_iface);

	if (ret) {
	if (msg)
	nlmsg_free(msg);
	return ret;
	}

	genlmsg_end(msg, msg_head);
	return genlmsg_reply(msg, info);
	}

	/**
	* batadv_netlink_tp_meter_start - Cancel a running tp_meter session
	* @skb: received netlink message
	* @info: receiver information
	*
	* Return: 0 on success, < 0 on error
	*/
	static int
	batadv_netlink_tp_meter_cancel(struct sk_buff skb, struct genl_info info)
	{
	struct net *net = genl_info_net(info);
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;
	int ifindex;
	u8 *dst;
	int ret = 0;

	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	return -EINVAL;

	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
	return -EINVAL;

	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	if (!ifindex)
	return -EINVAL;

	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);

	soft_iface = dev_get_by_index(net, ifindex);
	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	ret = -ENODEV;
	goto out;
	}

	bat_priv = netdev_priv(soft_iface);
	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);

	out:
	if (soft_iface)
	dev_put(soft_iface);

	return ret;
	}

	/**
	* batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
	* @msg: Netlink message to dump into
	* @portid: Port making netlink request
	* @seq: Sequence number of netlink message
	* @hard_iface: Hard interface to dump
	*
	* Return: error code, or 0 on success
	*/
	static int
	batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
	struct batadv_hard_iface *hard_iface)
	{
	struct net_device *net_dev = hard_iface->net_dev;
	void *hdr;

	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
	BATADV_CMD_GET_HARDIFS);
	if (!hdr)
	return -EMSGSIZE;

	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	net_dev->ifindex) \|\|
	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	net_dev->name) \|\|
	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	net_dev->dev_addr))
	goto nla_put_failure;

	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
	if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
	goto nla_put_failure;
	}

	genlmsg_end(msg, hdr);
	return 0;

	nla_put_failure:
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
	}

	/**
	* batadv_netlink_dump_hardifs - Dump all hard interface into a messages
	* @msg: Netlink message to dump into
	* @cb: Parameters from query
	*
	* Return: error code, or length of reply message on success
	*/
	static int
	batadv_netlink_dump_hardifs(struct sk_buff msg, struct netlink_callback cb)
	{
	struct net *net = sock_net(cb->skb->sk);
	struct net_device *soft_iface;
	struct batadv_hard_iface *hard_iface;
	int ifindex;
	int portid = NETLINK_CB(cb->skb).portid;
	int seq = cb->nlh->nlmsg_seq;
	int skip = cb->args[0];
	int i = 0;

	ifindex = batadv_netlink_get_ifindex(cb->nlh,
	BATADV_ATTR_MESH_IFINDEX);
	if (!ifindex)
	return -EINVAL;

	soft_iface = dev_get_by_index(net, ifindex);
	if (!soft_iface)
	return -ENODEV;

	if (!batadv_softif_is_valid(soft_iface)) {
	dev_put(soft_iface);
	return -ENODEV;
	}

	rcu_read_lock();

	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
	if (hard_iface->soft_iface != soft_iface)
	continue;

	if (i++ < skip)
	continue;

	if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
	hard_iface)) {
	i--;
	break;
	}
	}

	rcu_read_unlock();

	dev_put(soft_iface);

	cb->args[0] = i;

	return msg->len;
	}

	static struct genl_ops batadv_netlink_ops[] = {
	{
	.cmd = BATADV_CMD_GET_MESH_INFO,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.doit = batadv_netlink_get_mesh_info,
	},
	{
	.cmd = BATADV_CMD_TP_METER,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.doit = batadv_netlink_tp_meter_start,
	},
	{
	.cmd = BATADV_CMD_TP_METER_CANCEL,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.doit = batadv_netlink_tp_meter_cancel,
	},
	{
	.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.dumpit = batadv_algo_dump,
	},
	{
	.cmd = BATADV_CMD_GET_HARDIFS,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.dumpit = batadv_netlink_dump_hardifs,
	},
	{
	.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.dumpit = batadv_tt_local_dump,
	},
	{
	.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.dumpit = batadv_tt_global_dump,
	},
	{
	.cmd = BATADV_CMD_GET_ORIGINATORS,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.dumpit = batadv_orig_dump,
	},
	{
	.cmd = BATADV_CMD_GET_NEIGHBORS,
	.flags = GENL_ADMIN_PERM,
	.policy = batadv_netlink_policy,
	.dumpit = batadv_hardif_neigh_dump,
	},
	};

	/**
	* batadv_netlink_register - register batadv genl netlink family
	*/
	void __init batadv_netlink_register(void)
	{
	int ret;

	ret = genl_register_family_with_ops_groups(&batadv_netlink_family,
	batadv_netlink_ops,
	batadv_netlink_mcgrps);
	if (ret)
	pr_warn("unable to register netlink family");
	}

	/**
	* batadv_netlink_unregister - unregister batadv genl netlink family
	*/
	void batadv_netlink_unregister(void)
	{
	genl_unregister_family(&batadv_netlink_family);
	}