[mirror_ubuntu-jammy-kernel.git] / net / batman-adv / netlink.c

/* 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_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);
}
Commit	Line	Data
09748a22 MS	1	/* Copyright (C) 2016 B.A.T.M.A.N. contributors:
	2	*
	3	* Matthias Schiffer
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of version 2 of the GNU General Public
	7	* License as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#include "netlink.h"
	19	#include "main.h"
	20
f32ed4b5	21	#include <linux/atomic.h>
5da0aef5 MS	22	#include <linux/errno.h>
5da0aef5 MS	23	#include <linux/fs.h>
09748a22	24	#include <linux/genetlink.h>
5da0aef5	25	#include <linux/if_ether.h>
09748a22	26	#include <linux/init.h>
5da0aef5 MS	27	#include <linux/netdevice.h>
5da0aef5 MS	28	#include <linux/netlink.h>
09748a22	29	#include <linux/printk.h>
b60620cf MS	30	#include <linux/rculist.h>
	31	#include <linux/rcupdate.h>
	32	#include <linux/skbuff.h>
5da0aef5	33	#include <linux/stddef.h>
33a3bb4a	34	#include <linux/types.h>
09748a22	35	#include <net/genetlink.h>
5da0aef5	36	#include <net/netlink.h>
b60620cf	37	#include <net/sock.h>
09748a22 MS	38	#include <uapi/linux/batman_adv.h>
09748a22 MS	39
07a3061e	40	#include "bat_algo.h"
5da0aef5	41	#include "hard-interface.h"
85cf8c85	42	#include "originator.h"
5da0aef5	43	#include "soft-interface.h"
33a3bb4a	44	#include "tp_meter.h"
d34f0550	45	#include "translation-table.h"
5da0aef5	46
07a3061e	47	struct genl_family batadv_netlink_family = {
09748a22 MS	48	.id = GENL_ID_GENERATE,
	49	.hdrsize = 0,
	50	.name = BATADV_NL_NAME,
	51	.version = 1,
	52	.maxattr = BATADV_ATTR_MAX,
	53	};
	54
33a3bb4a AQ	55	/* multicast groups */
	56	enum batadv_netlink_multicast_groups {
	57	BATADV_NL_MCGRP_TPMETER,
	58	};
	59
	60	static struct genl_multicast_group batadv_netlink_mcgrps[] = {
	61	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
	62	};
	63
5da0aef5 MS	64	static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
	65	[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
	66	[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
	67	[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
	68	[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
	69	[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
	70	[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
	71	[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
	72	[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
33a3bb4a AQ	73	[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
	74	[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
	75	[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
	76	[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
	77	[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
b60620cf	78	[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
d34f0550 MS	79	[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
	80	[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
	81	[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
	82	[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
	83	[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
	84	[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
	85	[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
	86	[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
024f99cb MS	87	[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
024f99cb MS	88	[BATADV_ATTR_TQ] = { .type = NLA_U8 },
5da0aef5 MS	89	};
5da0aef5 MS	90
b60620cf MS	91	/**
	92	* batadv_netlink_get_ifindex - Extract an interface index from a message
	93	* @nlh: Message header
	94	* @attrtype: Attribute which holds an interface index
	95	*
	96	* Return: interface index, or 0.
	97	*/
d34f0550	98	int
b60620cf MS	99	batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
	100	{
	101	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
	102
	103	return attr ? nla_get_u32(attr) : 0;
	104	}
	105
5da0aef5 MS	106	/**
	107	* batadv_netlink_mesh_info_put - fill in generic information about mesh
	108	* interface
	109	* @msg: netlink message to be sent back
	110	* @soft_iface: interface for which the data should be taken
	111	*
	112	* Return: 0 on success, < 0 on error
	113	*/
	114	static int
	115	batadv_netlink_mesh_info_put(struct sk_buff msg, struct net_device soft_iface)
	116	{
	117	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	118	struct batadv_hard_iface *primary_if = NULL;
	119	struct net_device *hard_iface;
	120	int ret = -ENOBUFS;
	121
	122	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) \|\|
	123	nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
29824a55	124	bat_priv->algo_ops->name) \|\|
5da0aef5 MS	125	nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) \|\|
	126	nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) \|\|
	127	nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
f32ed4b5 SE	128	soft_iface->dev_addr) \|\|
	129	nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
	130	(u8)atomic_read(&bat_priv->tt.vn)))
5da0aef5 MS	131	goto out;
	132
	133	primary_if = batadv_primary_if_get_selected(bat_priv);
	134	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
	135	hard_iface = primary_if->net_dev;
	136
	137	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	138	hard_iface->ifindex) \|\|
	139	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	140	hard_iface->name) \|\|
	141	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	142	hard_iface->dev_addr))
	143	goto out;
	144	}
	145
	146	ret = 0;
	147
	148	out:
	149	if (primary_if)
	150	batadv_hardif_put(primary_if);
	151
	152	return ret;
	153	}
	154
	155	/**
	156	* batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
	157	* netlink request
	158	* @skb: received netlink message
	159	* @info: receiver information
	160	*
	161	* Return: 0 on success, < 0 on error
	162	*/
	163	static int
	164	batadv_netlink_get_mesh_info(struct sk_buff skb, struct genl_info info)
	165	{
	166	struct net *net = genl_info_net(info);
	167	struct net_device *soft_iface;
	168	struct sk_buff *msg = NULL;
	169	void *msg_head;
	170	int ifindex;
	171	int ret;
	172
	173	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	174	return -EINVAL;
	175
	176	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	177	if (!ifindex)
	178	return -EINVAL;
	179
	180	soft_iface = dev_get_by_index(net, ifindex);
	181	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	182	ret = -ENODEV;
	183	goto out;
	184	}
	185
	186	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	187	if (!msg) {
	188	ret = -ENOMEM;
	189	goto out;
	190	}
	191
	192	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	193	&batadv_netlink_family, 0,
	194	BATADV_CMD_GET_MESH_INFO);
195	if (!msg_head) {
196	ret = -ENOBUFS;
197	goto out;
198	}
199
200	ret = batadv_netlink_mesh_info_put(msg, soft_iface);
201
202	out:
203	if (soft_iface)
204	dev_put(soft_iface);
205
206	if (ret) {
207	if (msg)
208	nlmsg_free(msg);
209	return ret;
210	}
211
212	genlmsg_end(msg, msg_head);
213	return genlmsg_reply(msg, info);
214	}
215
33a3bb4a AQ	216	/**
	217	* batadv_netlink_tp_meter_put - Fill information of started tp_meter session
	218	* @msg: netlink message to be sent back
	219	* @cookie: tp meter session cookie
	220	*
	221	* Return: 0 on success, < 0 on error
	222	*/
	223	static int
	224	batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
	225	{
	226	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	227	return -ENOBUFS;
	228
	229	return 0;
	230	}
	231
	232	/**
	233	* batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
	234	* @bat_priv: the bat priv with all the soft interface information
	235	* @dst: destination of tp_meter session
	236	* @result: reason for tp meter session stop
	237	* @test_time: total time ot the tp_meter session
	238	* @total_bytes: bytes acked to the receiver
	239	* @cookie: cookie of tp_meter session
	240	*
	241	* Return: 0 on success, < 0 on error
	242	*/
	243	int batadv_netlink_tpmeter_notify(struct batadv_priv bat_priv, const u8 dst,
	244	u8 result, u32 test_time, u64 total_bytes,
	245	u32 cookie)
	246	{
	247	struct sk_buff *msg;
	248	void *hdr;
	249	int ret;
	250
	251	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	252	if (!msg)
	253	return -ENOMEM;
	254
	255	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
	256	BATADV_CMD_TP_METER);
	257	if (!hdr) {
	258	ret = -ENOBUFS;
	259	goto err_genlmsg;
	260	}
	261
	262	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	263	goto nla_put_failure;
	264
	265	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
	266	goto nla_put_failure;
	267
	268	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
	269	BATADV_ATTR_PAD))
	270	goto nla_put_failure;
	271
	272	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
	273	goto nla_put_failure;
	274
	275	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
	276	goto nla_put_failure;
	277
	278	genlmsg_end(msg, hdr);
	279
280	genlmsg_multicast_netns(&batadv_netlink_family,
281	dev_net(bat_priv->soft_iface), msg, 0,
282	BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
283
284	return 0;
285
286	nla_put_failure:
287	genlmsg_cancel(msg, hdr);
288	ret = -EMSGSIZE;
289
290	err_genlmsg:
291	nlmsg_free(msg);
292	return ret;
293	}
294
295	/**
296	* batadv_netlink_tp_meter_start - Start a new tp_meter session
297	* @skb: received netlink message
298	* @info: receiver information
299	*
300	* Return: 0 on success, < 0 on error
301	*/
302	static int
303	batadv_netlink_tp_meter_start(struct sk_buff skb, struct genl_info info)
304	{
305	struct net *net = genl_info_net(info);
306	struct net_device *soft_iface;
307	struct batadv_priv *bat_priv;
308	struct sk_buff *msg = NULL;
309	u32 test_length;
310	void *msg_head;
311	int ifindex;
312	u32 cookie;
313	u8 *dst;
314	int ret;
315
316	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
317	return -EINVAL;
318
319	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
320	return -EINVAL;
321
322	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
323	return -EINVAL;
324
325	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
326	if (!ifindex)
327	return -EINVAL;
328
329	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
330
331	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
332
333	soft_iface = dev_get_by_index(net, ifindex);
334	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
335	ret = -ENODEV;
336	goto out;
337	}
338
339	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
340	if (!msg) {
341	ret = -ENOMEM;
342	goto out;
343	}
344
345	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
346	&batadv_netlink_family, 0,
347	BATADV_CMD_TP_METER);
348	if (!msg_head) {
349	ret = -ENOBUFS;
350	goto out;
351	}
352
353	bat_priv = netdev_priv(soft_iface);
354	batadv_tp_start(bat_priv, dst, test_length, &cookie);
355
356	ret = batadv_netlink_tp_meter_put(msg, cookie);
357
358	out:
359	if (soft_iface)
360	dev_put(soft_iface);
361
362	if (ret) {
363	if (msg)
364	nlmsg_free(msg);
365	return ret;
366	}
367
368	genlmsg_end(msg, msg_head);
369	return genlmsg_reply(msg, info);
370	}
371
372	/**
373	* batadv_netlink_tp_meter_start - Cancel a running tp_meter session
374	* @skb: received netlink message
375	* @info: receiver information
376	*
377	* Return: 0 on success, < 0 on error
378	*/
379	static int
380	batadv_netlink_tp_meter_cancel(struct sk_buff skb, struct genl_info info)
381	{
382	struct net *net = genl_info_net(info);
383	struct net_device *soft_iface;
384	struct batadv_priv *bat_priv;
385	int ifindex;
386	u8 *dst;
387	int ret = 0;
388
389	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
390	return -EINVAL;
391
392	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
393	return -EINVAL;
394
395	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
396	if (!ifindex)
397	return -EINVAL;
398
399	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
400
401	soft_iface = dev_get_by_index(net, ifindex);
402	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
403	ret = -ENODEV;
404	goto out;
405	}
406
407	bat_priv = netdev_priv(soft_iface);
408	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
409
410	out:
411	if (soft_iface)
412	dev_put(soft_iface);
413
414	return ret;
415	}
416
b60620cf MS	417	/**
	418	* batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
	419	* @msg: Netlink message to dump into
	420	* @portid: Port making netlink request
	421	* @seq: Sequence number of netlink message
	422	* @hard_iface: Hard interface to dump
	423	*
	424	* Return: error code, or 0 on success
	425	*/
	426	static int
	427	batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
	428	struct batadv_hard_iface *hard_iface)
	429	{
	430	struct net_device *net_dev = hard_iface->net_dev;
	431	void *hdr;
	432
	433	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
	434	BATADV_CMD_GET_HARDIFS);
	435	if (!hdr)
	436	return -EMSGSIZE;
	437
	438	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	439	net_dev->ifindex) \|\|
	440	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	441	net_dev->name) \|\|
	442	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	443	net_dev->dev_addr))
	444	goto nla_put_failure;
	445
	446	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
	447	if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
	448	goto nla_put_failure;
	449	}
	450
	451	genlmsg_end(msg, hdr);
	452	return 0;
	453
	454	nla_put_failure:
	455	genlmsg_cancel(msg, hdr);
	456	return -EMSGSIZE;
	457	}
	458
	459	/**
	460	* batadv_netlink_dump_hardifs - Dump all hard interface into a messages
	461	* @msg: Netlink message to dump into
	462	* @cb: Parameters from query
	463	*
	464	* Return: error code, or length of reply message on success
	465	*/
	466	static int
	467	batadv_netlink_dump_hardifs(struct sk_buff msg, struct netlink_callback cb)
	468	{
	469	struct net *net = sock_net(cb->skb->sk);
	470	struct net_device *soft_iface;
	471	struct batadv_hard_iface *hard_iface;
	472	int ifindex;
	473	int portid = NETLINK_CB(cb->skb).portid;
	474	int seq = cb->nlh->nlmsg_seq;
	475	int skip = cb->args[0];
	476	int i = 0;
	477
	478	ifindex = batadv_netlink_get_ifindex(cb->nlh,
	479	BATADV_ATTR_MESH_IFINDEX);
	480	if (!ifindex)
481	return -EINVAL;
482
483	soft_iface = dev_get_by_index(net, ifindex);
484	if (!soft_iface)
485	return -ENODEV;
486
487	if (!batadv_softif_is_valid(soft_iface)) {
488	dev_put(soft_iface);
489	return -ENODEV;
490	}
491
492	rcu_read_lock();
493
494	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
495	if (hard_iface->soft_iface != soft_iface)
496	continue;
497
498	if (i++ < skip)
499	continue;
500
501	if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
502	hard_iface)) {
503	i--;
504	break;
505	}
506	}
507
508	rcu_read_unlock();
509
510	dev_put(soft_iface);
511
512	cb->args[0] = i;
513
514	return msg->len;
515	}
516
09748a22	517	static struct genl_ops batadv_netlink_ops[] = {
5da0aef5 MS	518	{
	519	.cmd = BATADV_CMD_GET_MESH_INFO,
	520	.flags = GENL_ADMIN_PERM,
	521	.policy = batadv_netlink_policy,
	522	.doit = batadv_netlink_get_mesh_info,
	523	},
33a3bb4a AQ	524	{
	525	.cmd = BATADV_CMD_TP_METER,
	526	.flags = GENL_ADMIN_PERM,
	527	.policy = batadv_netlink_policy,
	528	.doit = batadv_netlink_tp_meter_start,
	529	},
	530	{
	531	.cmd = BATADV_CMD_TP_METER_CANCEL,
	532	.flags = GENL_ADMIN_PERM,
	533	.policy = batadv_netlink_policy,
	534	.doit = batadv_netlink_tp_meter_cancel,
	535	},
07a3061e MS	536	{
	537	.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
	538	.flags = GENL_ADMIN_PERM,
	539	.policy = batadv_netlink_policy,
	540	.dumpit = batadv_algo_dump,
	541	},
b60620cf MS	542	{
	543	.cmd = BATADV_CMD_GET_HARDIFS,
	544	.flags = GENL_ADMIN_PERM,
	545	.policy = batadv_netlink_policy,
	546	.dumpit = batadv_netlink_dump_hardifs,
	547	},
d34f0550 MS	548	{
	549	.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
	550	.flags = GENL_ADMIN_PERM,
	551	.policy = batadv_netlink_policy,
	552	.dumpit = batadv_tt_local_dump,
	553	},
	554	{
	555	.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
	556	.flags = GENL_ADMIN_PERM,
	557	.policy = batadv_netlink_policy,
	558	.dumpit = batadv_tt_global_dump,
	559	},
85cf8c85 MS	560	{
	561	.cmd = BATADV_CMD_GET_ORIGINATORS,
	562	.flags = GENL_ADMIN_PERM,
	563	.policy = batadv_netlink_policy,
	564	.dumpit = batadv_orig_dump,
	565	},
	566	{
	567	.cmd = BATADV_CMD_GET_NEIGHBORS,
	568	.flags = GENL_ADMIN_PERM,
	569	.policy = batadv_netlink_policy,
	570	.dumpit = batadv_hardif_neigh_dump,
	571	},
09748a22 MS	572	};
	573
	574	/**
	575	* batadv_netlink_register - register batadv genl netlink family
	576	*/
	577	void __init batadv_netlink_register(void)
	578	{
	579	int ret;
	580
33a3bb4a AQ	581	ret = genl_register_family_with_ops_groups(&batadv_netlink_family,
	582	batadv_netlink_ops,
	583	batadv_netlink_mcgrps);
09748a22 MS	584	if (ret)
	585	pr_warn("unable to register netlink family");
	586	}
	587
	588	/**
	589	* batadv_netlink_unregister - unregister batadv genl netlink family
	590	*/
	591	void batadv_netlink_unregister(void)
	592	{
	593	genl_unregister_family(&batadv_netlink_family);
	594	}