[deliverable/linux.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/byteorder/generic.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 "bridge_loop_avoidance.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "originator.h"
#include "packet.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,
	.netnsok = true,
};

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

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

static const 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_ATTR_BANDWIDTH_UP]	= { .type = NLA_U32 },
	[BATADV_ATTR_BANDWIDTH_DOWN]	= { .type = NLA_U32 },
	[BATADV_ATTR_ROUTER]		= { .len = ETH_ALEN },
	[BATADV_ATTR_BLA_OWN]		= { .type = NLA_FLAG },
	[BATADV_ATTR_BLA_ADDRESS]	= { .len = ETH_ALEN },
	[BATADV_ATTR_BLA_VID]		= { .type = NLA_U16 },
	[BATADV_ATTR_BLA_BACKBONE]	= { .len = ETH_ALEN },
	[BATADV_ATTR_BLA_CRC]		= { .type = NLA_U16 },
};

/**
 * 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;

#ifdef CONFIG_BATMAN_ADV_BLA
	if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
			ntohs(bat_priv->bla.claim_dest.group)))
		goto out;
#endif

	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,
	},
	{
		.cmd = BATADV_CMD_GET_GATEWAYS,
		.flags = GENL_ADMIN_PERM,
		.policy = batadv_netlink_policy,
		.dumpit = batadv_gw_dump,
	},
	{
		.cmd = BATADV_CMD_GET_BLA_CLAIM,
		.flags = GENL_ADMIN_PERM,
		.policy = batadv_netlink_policy,
		.dumpit = batadv_bla_claim_dump,
	},
	{
		.cmd = BATADV_CMD_GET_BLA_BACKBONE,
		.flags = GENL_ADMIN_PERM,
		.policy = batadv_netlink_policy,
		.dumpit = batadv_bla_backbone_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>
8dad6f0d	22	#include <linux/byteorder/generic.h>
5da0aef5 MS	23	#include <linux/errno.h>
5da0aef5 MS	24	#include <linux/fs.h>
09748a22	25	#include <linux/genetlink.h>
5da0aef5	26	#include <linux/if_ether.h>
09748a22	27	#include <linux/init.h>
5da0aef5 MS	28	#include <linux/netdevice.h>
5da0aef5 MS	29	#include <linux/netlink.h>
09748a22	30	#include <linux/printk.h>
b60620cf MS	31	#include <linux/rculist.h>
	32	#include <linux/rcupdate.h>
	33	#include <linux/skbuff.h>
5da0aef5	34	#include <linux/stddef.h>
33a3bb4a	35	#include <linux/types.h>
09748a22	36	#include <net/genetlink.h>
5da0aef5	37	#include <net/netlink.h>
b60620cf	38	#include <net/sock.h>
09748a22 MS	39	#include <uapi/linux/batman_adv.h>
09748a22 MS	40
07a3061e	41	#include "bat_algo.h"
04f3f5bf	42	#include "bridge_loop_avoidance.h"
d7129daf	43	#include "gateway_client.h"
5da0aef5	44	#include "hard-interface.h"
85cf8c85	45	#include "originator.h"
8dad6f0d	46	#include "packet.h"
5da0aef5	47	#include "soft-interface.h"
33a3bb4a	48	#include "tp_meter.h"
d34f0550	49	#include "translation-table.h"
5da0aef5	50
07a3061e	51	struct genl_family batadv_netlink_family = {
09748a22 MS	52	.id = GENL_ID_GENERATE,
	53	.hdrsize = 0,
	54	.name = BATADV_NL_NAME,
	55	.version = 1,
	56	.maxattr = BATADV_ATTR_MAX,
4c09a08b	57	.netnsok = true,
09748a22 MS	58	};
09748a22 MS	59
33a3bb4a AQ	60	/* multicast groups */
	61	enum batadv_netlink_multicast_groups {
	62	BATADV_NL_MCGRP_TPMETER,
	63	};
	64
deeb91f5	65	static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
33a3bb4a AQ	66	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
	67	};
	68
deeb91f5	69	static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
5da0aef5 MS	70	[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
	71	[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
	72	[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
	73	[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
	74	[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
	75	[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
	76	[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
	77	[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
33a3bb4a AQ	78	[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
	79	[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
	80	[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
	81	[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
	82	[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
b60620cf	83	[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
d34f0550 MS	84	[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
	85	[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
	86	[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
	87	[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
	88	[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
	89	[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
	90	[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
	91	[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
024f99cb MS	92	[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
024f99cb MS	93	[BATADV_ATTR_TQ] = { .type = NLA_U8 },
f02a478f	94	[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
d7129daf SE	95	[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
	96	[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
	97	[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
04f3f5bf AL	98	[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
	99	[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
	100	[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
	101	[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
	102	[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
5da0aef5 MS	103	};
5da0aef5 MS	104
b60620cf MS	105	/**
	106	* batadv_netlink_get_ifindex - Extract an interface index from a message
	107	* @nlh: Message header
	108	* @attrtype: Attribute which holds an interface index
	109	*
	110	* Return: interface index, or 0.
	111	*/
d34f0550	112	int
b60620cf MS	113	batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
	114	{
	115	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
	116
	117	return attr ? nla_get_u32(attr) : 0;
	118	}
	119
5da0aef5 MS	120	/**
	121	* batadv_netlink_mesh_info_put - fill in generic information about mesh
	122	* interface
	123	* @msg: netlink message to be sent back
	124	* @soft_iface: interface for which the data should be taken
	125	*
	126	* Return: 0 on success, < 0 on error
	127	*/
	128	static int
	129	batadv_netlink_mesh_info_put(struct sk_buff msg, struct net_device soft_iface)
	130	{
	131	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	132	struct batadv_hard_iface *primary_if = NULL;
	133	struct net_device *hard_iface;
	134	int ret = -ENOBUFS;
	135
	136	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) \|\|
	137	nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
29824a55	138	bat_priv->algo_ops->name) \|\|
5da0aef5 MS	139	nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) \|\|
	140	nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) \|\|
	141	nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
f32ed4b5 SE	142	soft_iface->dev_addr) \|\|
	143	nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
	144	(u8)atomic_read(&bat_priv->tt.vn)))
5da0aef5 MS	145	goto out;
5da0aef5 MS	146
8dad6f0d SE	147	#ifdef CONFIG_BATMAN_ADV_BLA
	148	if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
	149	ntohs(bat_priv->bla.claim_dest.group)))
	150	goto out;
	151	#endif
	152
5da0aef5 MS	153	primary_if = batadv_primary_if_get_selected(bat_priv);
	154	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
	155	hard_iface = primary_if->net_dev;
	156
	157	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	158	hard_iface->ifindex) \|\|
	159	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	160	hard_iface->name) \|\|
	161	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	162	hard_iface->dev_addr))
	163	goto out;
	164	}
	165
	166	ret = 0;
	167
	168	out:
	169	if (primary_if)
	170	batadv_hardif_put(primary_if);
	171
	172	return ret;
	173	}
	174
	175	/**
	176	* batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
	177	* netlink request
	178	* @skb: received netlink message
	179	* @info: receiver information
	180	*
	181	* Return: 0 on success, < 0 on error
	182	*/
	183	static int
	184	batadv_netlink_get_mesh_info(struct sk_buff skb, struct genl_info info)
	185	{
	186	struct net *net = genl_info_net(info);
	187	struct net_device *soft_iface;
	188	struct sk_buff *msg = NULL;
	189	void *msg_head;
	190	int ifindex;
	191	int ret;
	192
	193	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	194	return -EINVAL;
	195
	196	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	197	if (!ifindex)
	198	return -EINVAL;
	199
	200	soft_iface = dev_get_by_index(net, ifindex);
	201	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	202	ret = -ENODEV;
	203	goto out;
	204	}
	205
	206	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	207	if (!msg) {
	208	ret = -ENOMEM;
	209	goto out;
	210	}
	211
	212	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	213	&batadv_netlink_family, 0,
	214	BATADV_CMD_GET_MESH_INFO);
	215	if (!msg_head) {
	216	ret = -ENOBUFS;
217	goto out;
218	}
219
220	ret = batadv_netlink_mesh_info_put(msg, soft_iface);
221
222	out:
223	if (soft_iface)
224	dev_put(soft_iface);
225
226	if (ret) {
227	if (msg)
228	nlmsg_free(msg);
229	return ret;
230	}
231
232	genlmsg_end(msg, msg_head);
233	return genlmsg_reply(msg, info);
234	}
235
33a3bb4a AQ	236	/**
	237	* batadv_netlink_tp_meter_put - Fill information of started tp_meter session
	238	* @msg: netlink message to be sent back
	239	* @cookie: tp meter session cookie
	240	*
	241	* Return: 0 on success, < 0 on error
	242	*/
	243	static int
	244	batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
	245	{
	246	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	247	return -ENOBUFS;
	248
	249	return 0;
	250	}
	251
	252	/**
	253	* batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
	254	* @bat_priv: the bat priv with all the soft interface information
	255	* @dst: destination of tp_meter session
	256	* @result: reason for tp meter session stop
	257	* @test_time: total time ot the tp_meter session
	258	* @total_bytes: bytes acked to the receiver
	259	* @cookie: cookie of tp_meter session
	260	*
	261	* Return: 0 on success, < 0 on error
	262	*/
	263	int batadv_netlink_tpmeter_notify(struct batadv_priv bat_priv, const u8 dst,
	264	u8 result, u32 test_time, u64 total_bytes,
	265	u32 cookie)
	266	{
	267	struct sk_buff *msg;
	268	void *hdr;
	269	int ret;
	270
	271	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	272	if (!msg)
	273	return -ENOMEM;
	274
	275	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
	276	BATADV_CMD_TP_METER);
	277	if (!hdr) {
	278	ret = -ENOBUFS;
	279	goto err_genlmsg;
	280	}
	281
	282	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	283	goto nla_put_failure;
	284
	285	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
	286	goto nla_put_failure;
	287
	288	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
	289	BATADV_ATTR_PAD))
	290	goto nla_put_failure;
	291
	292	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
	293	goto nla_put_failure;
	294
	295	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
	296	goto nla_put_failure;
	297
	298	genlmsg_end(msg, hdr);
	299
300	genlmsg_multicast_netns(&batadv_netlink_family,
301	dev_net(bat_priv->soft_iface), msg, 0,
302	BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
303
304	return 0;
305
306	nla_put_failure:
307	genlmsg_cancel(msg, hdr);
308	ret = -EMSGSIZE;
309
310	err_genlmsg:
311	nlmsg_free(msg);
312	return ret;
313	}
314
315	/**
316	* batadv_netlink_tp_meter_start - Start a new tp_meter session
317	* @skb: received netlink message
318	* @info: receiver information
319	*
320	* Return: 0 on success, < 0 on error
321	*/
322	static int
323	batadv_netlink_tp_meter_start(struct sk_buff skb, struct genl_info info)
324	{
325	struct net *net = genl_info_net(info);
326	struct net_device *soft_iface;
327	struct batadv_priv *bat_priv;
328	struct sk_buff *msg = NULL;
329	u32 test_length;
330	void *msg_head;
331	int ifindex;
332	u32 cookie;
333	u8 *dst;
334	int ret;
335
336	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
337	return -EINVAL;
338
339	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
340	return -EINVAL;
341
342	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
343	return -EINVAL;
344
345	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
346	if (!ifindex)
347	return -EINVAL;
348
349	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
350
351	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
352
353	soft_iface = dev_get_by_index(net, ifindex);
354	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
355	ret = -ENODEV;
356	goto out;
357	}
358
359	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
360	if (!msg) {
361	ret = -ENOMEM;
362	goto out;
363	}
364
365	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
366	&batadv_netlink_family, 0,
367	BATADV_CMD_TP_METER);
368	if (!msg_head) {
369	ret = -ENOBUFS;
370	goto out;
371	}
372
373	bat_priv = netdev_priv(soft_iface);
374	batadv_tp_start(bat_priv, dst, test_length, &cookie);
375
376	ret = batadv_netlink_tp_meter_put(msg, cookie);
377
378	out:
379	if (soft_iface)
380	dev_put(soft_iface);
381
382	if (ret) {
383	if (msg)
384	nlmsg_free(msg);
385	return ret;
386	}
387
388	genlmsg_end(msg, msg_head);
389	return genlmsg_reply(msg, info);
390	}
391
392	/**
393	* batadv_netlink_tp_meter_start - Cancel a running tp_meter session
394	* @skb: received netlink message
395	* @info: receiver information
396	*
397	* Return: 0 on success, < 0 on error
398	*/
399	static int
400	batadv_netlink_tp_meter_cancel(struct sk_buff skb, struct genl_info info)
401	{
402	struct net *net = genl_info_net(info);
403	struct net_device *soft_iface;
404	struct batadv_priv *bat_priv;
405	int ifindex;
406	u8 *dst;
407	int ret = 0;
408
409	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
410	return -EINVAL;
411
412	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
413	return -EINVAL;
414
415	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
416	if (!ifindex)
417	return -EINVAL;
418
419	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
420
421	soft_iface = dev_get_by_index(net, ifindex);
422	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
423	ret = -ENODEV;
424	goto out;
425	}
426
427	bat_priv = netdev_priv(soft_iface);
428	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
429
430	out:
431	if (soft_iface)
432	dev_put(soft_iface);
433
434	return ret;
435	}
436
b60620cf MS	437	/**
	438	* batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
	439	* @msg: Netlink message to dump into
	440	* @portid: Port making netlink request
	441	* @seq: Sequence number of netlink message
	442	* @hard_iface: Hard interface to dump
	443	*
	444	* Return: error code, or 0 on success
	445	*/
	446	static int
	447	batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
	448	struct batadv_hard_iface *hard_iface)
	449	{
	450	struct net_device *net_dev = hard_iface->net_dev;
	451	void *hdr;
	452
	453	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
	454	BATADV_CMD_GET_HARDIFS);
	455	if (!hdr)
	456	return -EMSGSIZE;
	457
	458	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	459	net_dev->ifindex) \|\|
	460	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	461	net_dev->name) \|\|
	462	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	463	net_dev->dev_addr))
	464	goto nla_put_failure;
	465
	466	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
	467	if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
	468	goto nla_put_failure;
	469	}
	470
	471	genlmsg_end(msg, hdr);
	472	return 0;
	473
	474	nla_put_failure:
	475	genlmsg_cancel(msg, hdr);
	476	return -EMSGSIZE;
	477	}
	478
	479	/**
	480	* batadv_netlink_dump_hardifs - Dump all hard interface into a messages
	481	* @msg: Netlink message to dump into
	482	* @cb: Parameters from query
	483	*
	484	* Return: error code, or length of reply message on success
	485	*/
	486	static int
	487	batadv_netlink_dump_hardifs(struct sk_buff msg, struct netlink_callback cb)
	488	{
	489	struct net *net = sock_net(cb->skb->sk);
	490	struct net_device *soft_iface;
	491	struct batadv_hard_iface *hard_iface;
	492	int ifindex;
	493	int portid = NETLINK_CB(cb->skb).portid;
	494	int seq = cb->nlh->nlmsg_seq;
	495	int skip = cb->args[0];
	496	int i = 0;
	497
	498	ifindex = batadv_netlink_get_ifindex(cb->nlh,
	499	BATADV_ATTR_MESH_IFINDEX);
	500	if (!ifindex)
501	return -EINVAL;
502
503	soft_iface = dev_get_by_index(net, ifindex);
504	if (!soft_iface)
505	return -ENODEV;
506
507	if (!batadv_softif_is_valid(soft_iface)) {
508	dev_put(soft_iface);
509	return -ENODEV;
510	}
511
512	rcu_read_lock();
513
514	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
515	if (hard_iface->soft_iface != soft_iface)
516	continue;
517
518	if (i++ < skip)
519	continue;
520
521	if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
522	hard_iface)) {
523	i--;
524	break;
525	}
526	}
527
528	rcu_read_unlock();
529
530	dev_put(soft_iface);
531
532	cb->args[0] = i;
533
534	return msg->len;
535	}
536
09748a22	537	static struct genl_ops batadv_netlink_ops[] = {
5da0aef5 MS	538	{
	539	.cmd = BATADV_CMD_GET_MESH_INFO,
	540	.flags = GENL_ADMIN_PERM,
	541	.policy = batadv_netlink_policy,
	542	.doit = batadv_netlink_get_mesh_info,
	543	},
33a3bb4a AQ	544	{
	545	.cmd = BATADV_CMD_TP_METER,
	546	.flags = GENL_ADMIN_PERM,
	547	.policy = batadv_netlink_policy,
	548	.doit = batadv_netlink_tp_meter_start,
	549	},
	550	{
	551	.cmd = BATADV_CMD_TP_METER_CANCEL,
	552	.flags = GENL_ADMIN_PERM,
	553	.policy = batadv_netlink_policy,
	554	.doit = batadv_netlink_tp_meter_cancel,
	555	},
07a3061e MS	556	{
	557	.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
	558	.flags = GENL_ADMIN_PERM,
	559	.policy = batadv_netlink_policy,
	560	.dumpit = batadv_algo_dump,
	561	},
b60620cf MS	562	{
	563	.cmd = BATADV_CMD_GET_HARDIFS,
	564	.flags = GENL_ADMIN_PERM,
	565	.policy = batadv_netlink_policy,
	566	.dumpit = batadv_netlink_dump_hardifs,
	567	},
d34f0550 MS	568	{
	569	.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
	570	.flags = GENL_ADMIN_PERM,
	571	.policy = batadv_netlink_policy,
	572	.dumpit = batadv_tt_local_dump,
	573	},
	574	{
	575	.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
	576	.flags = GENL_ADMIN_PERM,
	577	.policy = batadv_netlink_policy,
	578	.dumpit = batadv_tt_global_dump,
	579	},
85cf8c85 MS	580	{
	581	.cmd = BATADV_CMD_GET_ORIGINATORS,
	582	.flags = GENL_ADMIN_PERM,
	583	.policy = batadv_netlink_policy,
	584	.dumpit = batadv_orig_dump,
	585	},
	586	{
	587	.cmd = BATADV_CMD_GET_NEIGHBORS,
	588	.flags = GENL_ADMIN_PERM,
	589	.policy = batadv_netlink_policy,
	590	.dumpit = batadv_hardif_neigh_dump,
	591	},
d7129daf SE	592	{
	593	.cmd = BATADV_CMD_GET_GATEWAYS,
	594	.flags = GENL_ADMIN_PERM,
	595	.policy = batadv_netlink_policy,
	596	.dumpit = batadv_gw_dump,
	597	},
04f3f5bf AL	598	{
	599	.cmd = BATADV_CMD_GET_BLA_CLAIM,
	600	.flags = GENL_ADMIN_PERM,
	601	.policy = batadv_netlink_policy,
	602	.dumpit = batadv_bla_claim_dump,
	603	},
ea4152e1 SW	604	{
	605	.cmd = BATADV_CMD_GET_BLA_BACKBONE,
	606	.flags = GENL_ADMIN_PERM,
	607	.policy = batadv_netlink_policy,
	608	.dumpit = batadv_bla_backbone_dump,
	609	},
	610
09748a22 MS	611	};
	612
	613	/**
	614	* batadv_netlink_register - register batadv genl netlink family
	615	*/
	616	void __init batadv_netlink_register(void)
	617	{
	618	int ret;
	619
33a3bb4a AQ	620	ret = genl_register_family_with_ops_groups(&batadv_netlink_family,
	621	batadv_netlink_ops,
	622	batadv_netlink_mcgrps);
09748a22 MS	623	if (ret)
	624	pr_warn("unable to register netlink family");
	625	}
	626
	627	/**
	628	* batadv_netlink_unregister - unregister batadv genl netlink family
	629	*/
	630	void batadv_netlink_unregister(void)
	631	{
	632	genl_unregister_family(&batadv_netlink_family);
	633	}