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