[mirror_ubuntu-bionic-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;

/* 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,
	},

};

struct genl_family batadv_netlink_family = {
	.hdrsize = 0,
	.name = BATADV_NL_NAME,
	.version = 1,
	.maxattr = BATADV_ATTR_MAX,
	.netnsok = true,
	.module = THIS_MODULE,
	.ops = batadv_netlink_ops,
	.n_ops = ARRAY_SIZE(batadv_netlink_ops),
	.mcgrps = batadv_netlink_mcgrps,
	.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
};

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

	ret = genl_register_family(&batadv_netlink_family);
	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
489111e5	51	struct genl_family batadv_netlink_family;
09748a22	52
33a3bb4a AQ	53	/* multicast groups */
	54	enum batadv_netlink_multicast_groups {
	55	BATADV_NL_MCGRP_TPMETER,
	56	};
	57
deeb91f5	58	static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
33a3bb4a AQ	59	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
	60	};
	61
deeb91f5	62	static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
5da0aef5 MS	63	[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
	64	[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
	65	[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
	66	[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
	67	[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
	68	[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
	69	[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
	70	[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
33a3bb4a AQ	71	[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
	72	[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
	73	[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
	74	[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
	75	[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
b60620cf	76	[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
d34f0550 MS	77	[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
	78	[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
	79	[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
	80	[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
	81	[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
	82	[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
	83	[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
	84	[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
024f99cb MS	85	[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
024f99cb MS	86	[BATADV_ATTR_TQ] = { .type = NLA_U8 },
f02a478f	87	[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
d7129daf SE	88	[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
	89	[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
	90	[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
04f3f5bf AL	91	[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
	92	[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
	93	[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
	94	[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
	95	[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
5da0aef5 MS	96	};
5da0aef5 MS	97
b60620cf MS	98	/**
	99	* batadv_netlink_get_ifindex - Extract an interface index from a message
	100	* @nlh: Message header
	101	* @attrtype: Attribute which holds an interface index
	102	*
	103	* Return: interface index, or 0.
	104	*/
d34f0550	105	int
b60620cf MS	106	batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
	107	{
	108	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
	109
	110	return attr ? nla_get_u32(attr) : 0;
	111	}
	112
5da0aef5 MS	113	/**
	114	* batadv_netlink_mesh_info_put - fill in generic information about mesh
	115	* interface
	116	* @msg: netlink message to be sent back
	117	* @soft_iface: interface for which the data should be taken
	118	*
	119	* Return: 0 on success, < 0 on error
	120	*/
	121	static int
	122	batadv_netlink_mesh_info_put(struct sk_buff msg, struct net_device soft_iface)
	123	{
	124	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	125	struct batadv_hard_iface *primary_if = NULL;
	126	struct net_device *hard_iface;
	127	int ret = -ENOBUFS;
	128
	129	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) \|\|
	130	nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
29824a55	131	bat_priv->algo_ops->name) \|\|
5da0aef5 MS	132	nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) \|\|
	133	nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) \|\|
	134	nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
f32ed4b5 SE	135	soft_iface->dev_addr) \|\|
	136	nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
	137	(u8)atomic_read(&bat_priv->tt.vn)))
5da0aef5 MS	138	goto out;
5da0aef5 MS	139
8dad6f0d SE	140	#ifdef CONFIG_BATMAN_ADV_BLA
	141	if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
	142	ntohs(bat_priv->bla.claim_dest.group)))
	143	goto out;
	144	#endif
	145
5da0aef5 MS	146	primary_if = batadv_primary_if_get_selected(bat_priv);
	147	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
	148	hard_iface = primary_if->net_dev;
	149
	150	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	151	hard_iface->ifindex) \|\|
	152	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	153	hard_iface->name) \|\|
	154	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	155	hard_iface->dev_addr))
	156	goto out;
	157	}
	158
	159	ret = 0;
	160
	161	out:
	162	if (primary_if)
	163	batadv_hardif_put(primary_if);
	164
	165	return ret;
	166	}
	167
	168	/**
	169	* batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
	170	* netlink request
	171	* @skb: received netlink message
	172	* @info: receiver information
	173	*
	174	* Return: 0 on success, < 0 on error
	175	*/
	176	static int
	177	batadv_netlink_get_mesh_info(struct sk_buff skb, struct genl_info info)
	178	{
	179	struct net *net = genl_info_net(info);
	180	struct net_device *soft_iface;
	181	struct sk_buff *msg = NULL;
	182	void *msg_head;
	183	int ifindex;
	184	int ret;
	185
	186	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	187	return -EINVAL;
	188
	189	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	190	if (!ifindex)
	191	return -EINVAL;
	192
	193	soft_iface = dev_get_by_index(net, ifindex);
	194	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	195	ret = -ENODEV;
	196	goto out;
	197	}
	198
	199	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	200	if (!msg) {
	201	ret = -ENOMEM;
	202	goto out;
	203	}
	204
	205	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	206	&batadv_netlink_family, 0,
	207	BATADV_CMD_GET_MESH_INFO);
	208	if (!msg_head) {
	209	ret = -ENOBUFS;
210	goto out;
211	}
212
213	ret = batadv_netlink_mesh_info_put(msg, soft_iface);
214
215	out:
216	if (soft_iface)
217	dev_put(soft_iface);
218
219	if (ret) {
220	if (msg)
221	nlmsg_free(msg);
222	return ret;
223	}
224
225	genlmsg_end(msg, msg_head);
226	return genlmsg_reply(msg, info);
227	}
228
33a3bb4a AQ	229	/**
	230	* batadv_netlink_tp_meter_put - Fill information of started tp_meter session
	231	* @msg: netlink message to be sent back
	232	* @cookie: tp meter session cookie
	233	*
	234	* Return: 0 on success, < 0 on error
	235	*/
	236	static int
	237	batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
	238	{
	239	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	240	return -ENOBUFS;
	241
	242	return 0;
	243	}
	244
	245	/**
	246	* batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
	247	* @bat_priv: the bat priv with all the soft interface information
	248	* @dst: destination of tp_meter session
	249	* @result: reason for tp meter session stop
	250	* @test_time: total time ot the tp_meter session
	251	* @total_bytes: bytes acked to the receiver
	252	* @cookie: cookie of tp_meter session
	253	*
	254	* Return: 0 on success, < 0 on error
	255	*/
	256	int batadv_netlink_tpmeter_notify(struct batadv_priv bat_priv, const u8 dst,
	257	u8 result, u32 test_time, u64 total_bytes,
	258	u32 cookie)
	259	{
	260	struct sk_buff *msg;
	261	void *hdr;
	262	int ret;
	263
	264	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	265	if (!msg)
	266	return -ENOMEM;
	267
	268	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
	269	BATADV_CMD_TP_METER);
	270	if (!hdr) {
	271	ret = -ENOBUFS;
	272	goto err_genlmsg;
	273	}
	274
	275	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	276	goto nla_put_failure;
	277
	278	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
	279	goto nla_put_failure;
	280
	281	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
	282	BATADV_ATTR_PAD))
	283	goto nla_put_failure;
	284
	285	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
	286	goto nla_put_failure;
	287
	288	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
	289	goto nla_put_failure;
	290
	291	genlmsg_end(msg, hdr);
	292
293	genlmsg_multicast_netns(&batadv_netlink_family,
294	dev_net(bat_priv->soft_iface), msg, 0,
295	BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
296
297	return 0;
298
299	nla_put_failure:
300	genlmsg_cancel(msg, hdr);
301	ret = -EMSGSIZE;
302
303	err_genlmsg:
304	nlmsg_free(msg);
305	return ret;
306	}
307
308	/**
309	* batadv_netlink_tp_meter_start - Start a new tp_meter session
310	* @skb: received netlink message
311	* @info: receiver information
312	*
313	* Return: 0 on success, < 0 on error
314	*/
315	static int
316	batadv_netlink_tp_meter_start(struct sk_buff skb, struct genl_info info)
317	{
318	struct net *net = genl_info_net(info);
319	struct net_device *soft_iface;
320	struct batadv_priv *bat_priv;
321	struct sk_buff *msg = NULL;
322	u32 test_length;
323	void *msg_head;
324	int ifindex;
325	u32 cookie;
326	u8 *dst;
327	int ret;
328
329	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
330	return -EINVAL;
331
332	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
333	return -EINVAL;
334
335	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
336	return -EINVAL;
337
338	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
339	if (!ifindex)
340	return -EINVAL;
341
342	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
343
344	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
345
346	soft_iface = dev_get_by_index(net, ifindex);
347	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
348	ret = -ENODEV;
349	goto out;
350	}
351
352	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
353	if (!msg) {
354	ret = -ENOMEM;
355	goto out;
356	}
357
358	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
359	&batadv_netlink_family, 0,
360	BATADV_CMD_TP_METER);
361	if (!msg_head) {
362	ret = -ENOBUFS;
363	goto out;
364	}
365
366	bat_priv = netdev_priv(soft_iface);
367	batadv_tp_start(bat_priv, dst, test_length, &cookie);
368
369	ret = batadv_netlink_tp_meter_put(msg, cookie);
370
371	out:
372	if (soft_iface)
373	dev_put(soft_iface);
374
375	if (ret) {
376	if (msg)
377	nlmsg_free(msg);
378	return ret;
379	}
380
381	genlmsg_end(msg, msg_head);
382	return genlmsg_reply(msg, info);
383	}
384
385	/**
386	* batadv_netlink_tp_meter_start - Cancel a running tp_meter session
387	* @skb: received netlink message
388	* @info: receiver information
389	*
390	* Return: 0 on success, < 0 on error
391	*/
392	static int
393	batadv_netlink_tp_meter_cancel(struct sk_buff skb, struct genl_info info)
394	{
395	struct net *net = genl_info_net(info);
396	struct net_device *soft_iface;
397	struct batadv_priv *bat_priv;
398	int ifindex;
399	u8 *dst;
400	int ret = 0;
401
402	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
403	return -EINVAL;
404
405	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
406	return -EINVAL;
407
408	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
409	if (!ifindex)
410	return -EINVAL;
411
412	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
413
414	soft_iface = dev_get_by_index(net, ifindex);
415	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
416	ret = -ENODEV;
417	goto out;
418	}
419
420	bat_priv = netdev_priv(soft_iface);
421	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
422
423	out:
424	if (soft_iface)
425	dev_put(soft_iface);
426
427	return ret;
428	}
429
b60620cf MS	430	/**
	431	* batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
	432	* @msg: Netlink message to dump into
	433	* @portid: Port making netlink request
	434	* @seq: Sequence number of netlink message
	435	* @hard_iface: Hard interface to dump
	436	*
	437	* Return: error code, or 0 on success
	438	*/
	439	static int
	440	batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
	441	struct batadv_hard_iface *hard_iface)
	442	{
	443	struct net_device *net_dev = hard_iface->net_dev;
	444	void *hdr;
	445
	446	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
	447	BATADV_CMD_GET_HARDIFS);
	448	if (!hdr)
	449	return -EMSGSIZE;
	450
	451	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	452	net_dev->ifindex) \|\|
	453	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	454	net_dev->name) \|\|
	455	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	456	net_dev->dev_addr))
	457	goto nla_put_failure;
	458
	459	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
	460	if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
	461	goto nla_put_failure;
	462	}
	463
	464	genlmsg_end(msg, hdr);
	465	return 0;
	466
	467	nla_put_failure:
	468	genlmsg_cancel(msg, hdr);
	469	return -EMSGSIZE;
	470	}
	471
	472	/**
	473	* batadv_netlink_dump_hardifs - Dump all hard interface into a messages
	474	* @msg: Netlink message to dump into
	475	* @cb: Parameters from query
	476	*
	477	* Return: error code, or length of reply message on success
	478	*/
	479	static int
	480	batadv_netlink_dump_hardifs(struct sk_buff msg, struct netlink_callback cb)
	481	{
	482	struct net *net = sock_net(cb->skb->sk);
	483	struct net_device *soft_iface;
	484	struct batadv_hard_iface *hard_iface;
	485	int ifindex;
	486	int portid = NETLINK_CB(cb->skb).portid;
	487	int seq = cb->nlh->nlmsg_seq;
	488	int skip = cb->args[0];
	489	int i = 0;
	490
	491	ifindex = batadv_netlink_get_ifindex(cb->nlh,
	492	BATADV_ATTR_MESH_IFINDEX);
	493	if (!ifindex)
494	return -EINVAL;
495
496	soft_iface = dev_get_by_index(net, ifindex);
497	if (!soft_iface)
498	return -ENODEV;
499
500	if (!batadv_softif_is_valid(soft_iface)) {
501	dev_put(soft_iface);
502	return -ENODEV;
503	}
504
505	rcu_read_lock();
506
507	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
508	if (hard_iface->soft_iface != soft_iface)
509	continue;
510
511	if (i++ < skip)
512	continue;
513
514	if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
515	hard_iface)) {
516	i--;
517	break;
518	}
519	}
520
521	rcu_read_unlock();
522
523	dev_put(soft_iface);
524
525	cb->args[0] = i;
526
527	return msg->len;
528	}
529
09748a22	530	static struct genl_ops batadv_netlink_ops[] = {
5da0aef5 MS	531	{
	532	.cmd = BATADV_CMD_GET_MESH_INFO,
	533	.flags = GENL_ADMIN_PERM,
	534	.policy = batadv_netlink_policy,
	535	.doit = batadv_netlink_get_mesh_info,
	536	},
33a3bb4a AQ	537	{
	538	.cmd = BATADV_CMD_TP_METER,
	539	.flags = GENL_ADMIN_PERM,
	540	.policy = batadv_netlink_policy,
	541	.doit = batadv_netlink_tp_meter_start,
	542	},
	543	{
	544	.cmd = BATADV_CMD_TP_METER_CANCEL,
	545	.flags = GENL_ADMIN_PERM,
	546	.policy = batadv_netlink_policy,
	547	.doit = batadv_netlink_tp_meter_cancel,
	548	},
07a3061e MS	549	{
	550	.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
	551	.flags = GENL_ADMIN_PERM,
	552	.policy = batadv_netlink_policy,
	553	.dumpit = batadv_algo_dump,
	554	},
b60620cf MS	555	{
	556	.cmd = BATADV_CMD_GET_HARDIFS,
	557	.flags = GENL_ADMIN_PERM,
	558	.policy = batadv_netlink_policy,
	559	.dumpit = batadv_netlink_dump_hardifs,
	560	},
d34f0550 MS	561	{
	562	.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
	563	.flags = GENL_ADMIN_PERM,
	564	.policy = batadv_netlink_policy,
	565	.dumpit = batadv_tt_local_dump,
	566	},
	567	{
	568	.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
	569	.flags = GENL_ADMIN_PERM,
	570	.policy = batadv_netlink_policy,
	571	.dumpit = batadv_tt_global_dump,
	572	},
85cf8c85 MS	573	{
	574	.cmd = BATADV_CMD_GET_ORIGINATORS,
	575	.flags = GENL_ADMIN_PERM,
	576	.policy = batadv_netlink_policy,
	577	.dumpit = batadv_orig_dump,
	578	},
	579	{
	580	.cmd = BATADV_CMD_GET_NEIGHBORS,
	581	.flags = GENL_ADMIN_PERM,
	582	.policy = batadv_netlink_policy,
	583	.dumpit = batadv_hardif_neigh_dump,
	584	},
d7129daf SE	585	{
	586	.cmd = BATADV_CMD_GET_GATEWAYS,
	587	.flags = GENL_ADMIN_PERM,
	588	.policy = batadv_netlink_policy,
	589	.dumpit = batadv_gw_dump,
	590	},
04f3f5bf AL	591	{
	592	.cmd = BATADV_CMD_GET_BLA_CLAIM,
	593	.flags = GENL_ADMIN_PERM,
	594	.policy = batadv_netlink_policy,
	595	.dumpit = batadv_bla_claim_dump,
	596	},
ea4152e1 SW	597	{
	598	.cmd = BATADV_CMD_GET_BLA_BACKBONE,
	599	.flags = GENL_ADMIN_PERM,
	600	.policy = batadv_netlink_policy,
	601	.dumpit = batadv_bla_backbone_dump,
	602	},
	603
09748a22 MS	604	};
09748a22 MS	605
489111e5 JB	606	struct genl_family batadv_netlink_family = {
	607	.hdrsize = 0,
	608	.name = BATADV_NL_NAME,
	609	.version = 1,
	610	.maxattr = BATADV_ATTR_MAX,
	611	.netnsok = true,
	612	.module = THIS_MODULE,
	613	.ops = batadv_netlink_ops,
	614	.n_ops = ARRAY_SIZE(batadv_netlink_ops),
	615	.mcgrps = batadv_netlink_mcgrps,
	616	.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
	617	};
	618
09748a22 MS	619	/**
	620	* batadv_netlink_register - register batadv genl netlink family
	621	*/
	622	void __init batadv_netlink_register(void)
	623	{
	624	int ret;
	625
489111e5	626	ret = genl_register_family(&batadv_netlink_family);
09748a22 MS	627	if (ret)
	628	pr_warn("unable to register netlink family");
	629	}
	630
	631	/**
	632	* batadv_netlink_unregister - unregister batadv genl netlink family
	633	*/
	634	void batadv_netlink_unregister(void)
	635	{
	636	genl_unregister_family(&batadv_netlink_family);
	637	}