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

/* Copyright (C) 2016-2017  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/cache.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/fs.h>
#include <linux/genetlink.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/kernel.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 const 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 __ro_after_init = {
	.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
ac79cbb9	1	/* Copyright (C) 2016-2017 B.A.T.M.A.N. contributors:
09748a22 MS	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>
9bcb94c8	23	#include <linux/cache.h>
5da0aef5	24	#include <linux/errno.h>
9bcb94c8	25	#include <linux/export.h>
5da0aef5	26	#include <linux/fs.h>
09748a22	27	#include <linux/genetlink.h>
5da0aef5	28	#include <linux/if_ether.h>
09748a22	29	#include <linux/init.h>
9bcb94c8	30	#include <linux/kernel.h>
5da0aef5 MS	31	#include <linux/netdevice.h>
5da0aef5 MS	32	#include <linux/netlink.h>
09748a22	33	#include <linux/printk.h>
b60620cf MS	34	#include <linux/rculist.h>
	35	#include <linux/rcupdate.h>
	36	#include <linux/skbuff.h>
5da0aef5	37	#include <linux/stddef.h>
33a3bb4a	38	#include <linux/types.h>
09748a22	39	#include <net/genetlink.h>
5da0aef5	40	#include <net/netlink.h>
b60620cf	41	#include <net/sock.h>
09748a22 MS	42	#include <uapi/linux/batman_adv.h>
09748a22 MS	43
07a3061e	44	#include "bat_algo.h"
04f3f5bf	45	#include "bridge_loop_avoidance.h"
d7129daf	46	#include "gateway_client.h"
5da0aef5	47	#include "hard-interface.h"
85cf8c85	48	#include "originator.h"
8dad6f0d	49	#include "packet.h"
5da0aef5	50	#include "soft-interface.h"
33a3bb4a	51	#include "tp_meter.h"
d34f0550	52	#include "translation-table.h"
5da0aef5	53
489111e5	54	struct genl_family batadv_netlink_family;
09748a22	55
33a3bb4a AQ	56	/* multicast groups */
	57	enum batadv_netlink_multicast_groups {
	58	BATADV_NL_MCGRP_TPMETER,
	59	};
	60
deeb91f5	61	static const struct genl_multicast_group batadv_netlink_mcgrps[] = {
33a3bb4a AQ	62	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
	63	};
	64
deeb91f5	65	static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
5da0aef5 MS	66	[BATADV_ATTR_VERSION] = { .type = NLA_STRING },
	67	[BATADV_ATTR_ALGO_NAME] = { .type = NLA_STRING },
	68	[BATADV_ATTR_MESH_IFINDEX] = { .type = NLA_U32 },
	69	[BATADV_ATTR_MESH_IFNAME] = { .type = NLA_STRING },
	70	[BATADV_ATTR_MESH_ADDRESS] = { .len = ETH_ALEN },
	71	[BATADV_ATTR_HARD_IFINDEX] = { .type = NLA_U32 },
	72	[BATADV_ATTR_HARD_IFNAME] = { .type = NLA_STRING },
	73	[BATADV_ATTR_HARD_ADDRESS] = { .len = ETH_ALEN },
33a3bb4a AQ	74	[BATADV_ATTR_ORIG_ADDRESS] = { .len = ETH_ALEN },
	75	[BATADV_ATTR_TPMETER_RESULT] = { .type = NLA_U8 },
	76	[BATADV_ATTR_TPMETER_TEST_TIME] = { .type = NLA_U32 },
	77	[BATADV_ATTR_TPMETER_BYTES] = { .type = NLA_U64 },
	78	[BATADV_ATTR_TPMETER_COOKIE] = { .type = NLA_U32 },
b60620cf	79	[BATADV_ATTR_ACTIVE] = { .type = NLA_FLAG },
d34f0550 MS	80	[BATADV_ATTR_TT_ADDRESS] = { .len = ETH_ALEN },
	81	[BATADV_ATTR_TT_TTVN] = { .type = NLA_U8 },
	82	[BATADV_ATTR_TT_LAST_TTVN] = { .type = NLA_U8 },
	83	[BATADV_ATTR_TT_CRC32] = { .type = NLA_U32 },
	84	[BATADV_ATTR_TT_VID] = { .type = NLA_U16 },
	85	[BATADV_ATTR_TT_FLAGS] = { .type = NLA_U32 },
	86	[BATADV_ATTR_FLAG_BEST] = { .type = NLA_FLAG },
	87	[BATADV_ATTR_LAST_SEEN_MSECS] = { .type = NLA_U32 },
024f99cb MS	88	[BATADV_ATTR_NEIGH_ADDRESS] = { .len = ETH_ALEN },
024f99cb MS	89	[BATADV_ATTR_TQ] = { .type = NLA_U8 },
f02a478f	90	[BATADV_ATTR_THROUGHPUT] = { .type = NLA_U32 },
d7129daf SE	91	[BATADV_ATTR_BANDWIDTH_UP] = { .type = NLA_U32 },
	92	[BATADV_ATTR_BANDWIDTH_DOWN] = { .type = NLA_U32 },
	93	[BATADV_ATTR_ROUTER] = { .len = ETH_ALEN },
04f3f5bf AL	94	[BATADV_ATTR_BLA_OWN] = { .type = NLA_FLAG },
	95	[BATADV_ATTR_BLA_ADDRESS] = { .len = ETH_ALEN },
	96	[BATADV_ATTR_BLA_VID] = { .type = NLA_U16 },
	97	[BATADV_ATTR_BLA_BACKBONE] = { .len = ETH_ALEN },
	98	[BATADV_ATTR_BLA_CRC] = { .type = NLA_U16 },
5da0aef5 MS	99	};
5da0aef5 MS	100
b60620cf MS	101	/**
	102	* batadv_netlink_get_ifindex - Extract an interface index from a message
	103	* @nlh: Message header
	104	* @attrtype: Attribute which holds an interface index
	105	*
	106	* Return: interface index, or 0.
	107	*/
d34f0550	108	int
b60620cf MS	109	batadv_netlink_get_ifindex(const struct nlmsghdr *nlh, int attrtype)
	110	{
	111	struct nlattr *attr = nlmsg_find_attr(nlh, GENL_HDRLEN, attrtype);
	112
	113	return attr ? nla_get_u32(attr) : 0;
	114	}
	115
5da0aef5 MS	116	/**
	117	* batadv_netlink_mesh_info_put - fill in generic information about mesh
	118	* interface
	119	* @msg: netlink message to be sent back
	120	* @soft_iface: interface for which the data should be taken
	121	*
	122	* Return: 0 on success, < 0 on error
	123	*/
	124	static int
	125	batadv_netlink_mesh_info_put(struct sk_buff msg, struct net_device soft_iface)
	126	{
	127	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
	128	struct batadv_hard_iface *primary_if = NULL;
	129	struct net_device *hard_iface;
	130	int ret = -ENOBUFS;
	131
	132	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) \|\|
	133	nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
29824a55	134	bat_priv->algo_ops->name) \|\|
5da0aef5 MS	135	nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) \|\|
	136	nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) \|\|
	137	nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
f32ed4b5 SE	138	soft_iface->dev_addr) \|\|
	139	nla_put_u8(msg, BATADV_ATTR_TT_TTVN,
	140	(u8)atomic_read(&bat_priv->tt.vn)))
5da0aef5 MS	141	goto out;
5da0aef5 MS	142
8dad6f0d SE	143	#ifdef CONFIG_BATMAN_ADV_BLA
	144	if (nla_put_u16(msg, BATADV_ATTR_BLA_CRC,
	145	ntohs(bat_priv->bla.claim_dest.group)))
	146	goto out;
	147	#endif
	148
5da0aef5 MS	149	primary_if = batadv_primary_if_get_selected(bat_priv);
	150	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
	151	hard_iface = primary_if->net_dev;
	152
	153	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	154	hard_iface->ifindex) \|\|
	155	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	156	hard_iface->name) \|\|
	157	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	158	hard_iface->dev_addr))
	159	goto out;
	160	}
	161
	162	ret = 0;
	163
	164	out:
	165	if (primary_if)
	166	batadv_hardif_put(primary_if);
	167
	168	return ret;
	169	}
	170
	171	/**
	172	* batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
	173	* netlink request
	174	* @skb: received netlink message
	175	* @info: receiver information
	176	*
	177	* Return: 0 on success, < 0 on error
	178	*/
	179	static int
	180	batadv_netlink_get_mesh_info(struct sk_buff skb, struct genl_info info)
	181	{
	182	struct net *net = genl_info_net(info);
	183	struct net_device *soft_iface;
	184	struct sk_buff *msg = NULL;
	185	void *msg_head;
	186	int ifindex;
	187	int ret;
	188
	189	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
	190	return -EINVAL;
	191
	192	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
	193	if (!ifindex)
	194	return -EINVAL;
	195
	196	soft_iface = dev_get_by_index(net, ifindex);
	197	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
	198	ret = -ENODEV;
	199	goto out;
	200	}
	201
	202	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	203	if (!msg) {
	204	ret = -ENOMEM;
	205	goto out;
	206	}
	207
	208	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
	209	&batadv_netlink_family, 0,
	210	BATADV_CMD_GET_MESH_INFO);
	211	if (!msg_head) {
	212	ret = -ENOBUFS;
213	goto out;
214	}
215
216	ret = batadv_netlink_mesh_info_put(msg, soft_iface);
217
218	out:
219	if (soft_iface)
220	dev_put(soft_iface);
221
222	if (ret) {
223	if (msg)
224	nlmsg_free(msg);
225	return ret;
226	}
227
228	genlmsg_end(msg, msg_head);
229	return genlmsg_reply(msg, info);
230	}
231
33a3bb4a AQ	232	/**
	233	* batadv_netlink_tp_meter_put - Fill information of started tp_meter session
	234	* @msg: netlink message to be sent back
	235	* @cookie: tp meter session cookie
	236	*
	237	* Return: 0 on success, < 0 on error
	238	*/
	239	static int
	240	batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
	241	{
	242	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	243	return -ENOBUFS;
	244
	245	return 0;
	246	}
	247
	248	/**
	249	* batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
	250	* @bat_priv: the bat priv with all the soft interface information
	251	* @dst: destination of tp_meter session
	252	* @result: reason for tp meter session stop
	253	* @test_time: total time ot the tp_meter session
	254	* @total_bytes: bytes acked to the receiver
	255	* @cookie: cookie of tp_meter session
	256	*
	257	* Return: 0 on success, < 0 on error
	258	*/
	259	int batadv_netlink_tpmeter_notify(struct batadv_priv bat_priv, const u8 dst,
	260	u8 result, u32 test_time, u64 total_bytes,
	261	u32 cookie)
	262	{
	263	struct sk_buff *msg;
	264	void *hdr;
	265	int ret;
	266
	267	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
	268	if (!msg)
	269	return -ENOMEM;
	270
	271	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
	272	BATADV_CMD_TP_METER);
	273	if (!hdr) {
	274	ret = -ENOBUFS;
	275	goto err_genlmsg;
	276	}
	277
	278	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
	279	goto nla_put_failure;
	280
	281	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
	282	goto nla_put_failure;
	283
	284	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
	285	BATADV_ATTR_PAD))
	286	goto nla_put_failure;
	287
	288	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
	289	goto nla_put_failure;
	290
	291	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
	292	goto nla_put_failure;
	293
	294	genlmsg_end(msg, hdr);
	295
296	genlmsg_multicast_netns(&batadv_netlink_family,
297	dev_net(bat_priv->soft_iface), msg, 0,
298	BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
299
300	return 0;
301
302	nla_put_failure:
303	genlmsg_cancel(msg, hdr);
304	ret = -EMSGSIZE;
305
306	err_genlmsg:
307	nlmsg_free(msg);
308	return ret;
309	}
310
311	/**
312	* batadv_netlink_tp_meter_start - Start a new tp_meter session
313	* @skb: received netlink message
314	* @info: receiver information
315	*
316	* Return: 0 on success, < 0 on error
317	*/
318	static int
319	batadv_netlink_tp_meter_start(struct sk_buff skb, struct genl_info info)
320	{
321	struct net *net = genl_info_net(info);
322	struct net_device *soft_iface;
323	struct batadv_priv *bat_priv;
324	struct sk_buff *msg = NULL;
325	u32 test_length;
326	void *msg_head;
327	int ifindex;
328	u32 cookie;
329	u8 *dst;
330	int ret;
331
332	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
333	return -EINVAL;
334
335	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
336	return -EINVAL;
337
338	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
339	return -EINVAL;
340
341	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
342	if (!ifindex)
343	return -EINVAL;
344
345	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
346
347	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
348
349	soft_iface = dev_get_by_index(net, ifindex);
350	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
351	ret = -ENODEV;
352	goto out;
353	}
354
355	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
356	if (!msg) {
357	ret = -ENOMEM;
358	goto out;
359	}
360
361	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
362	&batadv_netlink_family, 0,
363	BATADV_CMD_TP_METER);
364	if (!msg_head) {
365	ret = -ENOBUFS;
366	goto out;
367	}
368
369	bat_priv = netdev_priv(soft_iface);
370	batadv_tp_start(bat_priv, dst, test_length, &cookie);
371
372	ret = batadv_netlink_tp_meter_put(msg, cookie);
373
374	out:
375	if (soft_iface)
376	dev_put(soft_iface);
377
378	if (ret) {
379	if (msg)
380	nlmsg_free(msg);
381	return ret;
382	}
383
384	genlmsg_end(msg, msg_head);
385	return genlmsg_reply(msg, info);
386	}
387
388	/**
389	* batadv_netlink_tp_meter_start - Cancel a running tp_meter session
390	* @skb: received netlink message
391	* @info: receiver information
392	*
393	* Return: 0 on success, < 0 on error
394	*/
395	static int
396	batadv_netlink_tp_meter_cancel(struct sk_buff skb, struct genl_info info)
397	{
398	struct net *net = genl_info_net(info);
399	struct net_device *soft_iface;
400	struct batadv_priv *bat_priv;
401	int ifindex;
402	u8 *dst;
403	int ret = 0;
404
405	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
406	return -EINVAL;
407
408	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
409	return -EINVAL;
410
411	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
412	if (!ifindex)
413	return -EINVAL;
414
415	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
416
417	soft_iface = dev_get_by_index(net, ifindex);
418	if (!soft_iface \|\| !batadv_softif_is_valid(soft_iface)) {
419	ret = -ENODEV;
420	goto out;
421	}
422
423	bat_priv = netdev_priv(soft_iface);
424	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
425
426	out:
427	if (soft_iface)
428	dev_put(soft_iface);
429
430	return ret;
431	}
432
b60620cf MS	433	/**
	434	* batadv_netlink_dump_hardif_entry - Dump one hard interface into a message
	435	* @msg: Netlink message to dump into
	436	* @portid: Port making netlink request
	437	* @seq: Sequence number of netlink message
	438	* @hard_iface: Hard interface to dump
	439	*
	440	* Return: error code, or 0 on success
	441	*/
	442	static int
	443	batadv_netlink_dump_hardif_entry(struct sk_buff *msg, u32 portid, u32 seq,
	444	struct batadv_hard_iface *hard_iface)
	445	{
	446	struct net_device *net_dev = hard_iface->net_dev;
	447	void *hdr;
	448
	449	hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, NLM_F_MULTI,
	450	BATADV_CMD_GET_HARDIFS);
	451	if (!hdr)
	452	return -EMSGSIZE;
	453
	454	if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
	455	net_dev->ifindex) \|\|
	456	nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
	457	net_dev->name) \|\|
	458	nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
	459	net_dev->dev_addr))
	460	goto nla_put_failure;
	461
	462	if (hard_iface->if_status == BATADV_IF_ACTIVE) {
	463	if (nla_put_flag(msg, BATADV_ATTR_ACTIVE))
	464	goto nla_put_failure;
	465	}
	466
	467	genlmsg_end(msg, hdr);
	468	return 0;
	469
	470	nla_put_failure:
	471	genlmsg_cancel(msg, hdr);
	472	return -EMSGSIZE;
	473	}
	474
	475	/**
	476	* batadv_netlink_dump_hardifs - Dump all hard interface into a messages
	477	* @msg: Netlink message to dump into
	478	* @cb: Parameters from query
	479	*
	480	* Return: error code, or length of reply message on success
	481	*/
	482	static int
	483	batadv_netlink_dump_hardifs(struct sk_buff msg, struct netlink_callback cb)
	484	{
	485	struct net *net = sock_net(cb->skb->sk);
	486	struct net_device *soft_iface;
	487	struct batadv_hard_iface *hard_iface;
	488	int ifindex;
	489	int portid = NETLINK_CB(cb->skb).portid;
	490	int seq = cb->nlh->nlmsg_seq;
	491	int skip = cb->args[0];
	492	int i = 0;
	493
	494	ifindex = batadv_netlink_get_ifindex(cb->nlh,
	495	BATADV_ATTR_MESH_IFINDEX);
	496	if (!ifindex)
497	return -EINVAL;
498
499	soft_iface = dev_get_by_index(net, ifindex);
500	if (!soft_iface)
501	return -ENODEV;
502
503	if (!batadv_softif_is_valid(soft_iface)) {
504	dev_put(soft_iface);
505	return -ENODEV;
506	}
507
508	rcu_read_lock();
509
510	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
511	if (hard_iface->soft_iface != soft_iface)
512	continue;
513
514	if (i++ < skip)
515	continue;
516
517	if (batadv_netlink_dump_hardif_entry(msg, portid, seq,
518	hard_iface)) {
519	i--;
520	break;
521	}
522	}
523
524	rcu_read_unlock();
525
526	dev_put(soft_iface);
527
528	cb->args[0] = i;
529
530	return msg->len;
531	}
532
ce1a21d1	533	static const struct genl_ops batadv_netlink_ops[] = {
5da0aef5 MS	534	{
	535	.cmd = BATADV_CMD_GET_MESH_INFO,
	536	.flags = GENL_ADMIN_PERM,
	537	.policy = batadv_netlink_policy,
	538	.doit = batadv_netlink_get_mesh_info,
	539	},
33a3bb4a AQ	540	{
	541	.cmd = BATADV_CMD_TP_METER,
	542	.flags = GENL_ADMIN_PERM,
	543	.policy = batadv_netlink_policy,
	544	.doit = batadv_netlink_tp_meter_start,
	545	},
	546	{
	547	.cmd = BATADV_CMD_TP_METER_CANCEL,
	548	.flags = GENL_ADMIN_PERM,
	549	.policy = batadv_netlink_policy,
	550	.doit = batadv_netlink_tp_meter_cancel,
	551	},
07a3061e MS	552	{
	553	.cmd = BATADV_CMD_GET_ROUTING_ALGOS,
	554	.flags = GENL_ADMIN_PERM,
	555	.policy = batadv_netlink_policy,
	556	.dumpit = batadv_algo_dump,
	557	},
b60620cf MS	558	{
	559	.cmd = BATADV_CMD_GET_HARDIFS,
	560	.flags = GENL_ADMIN_PERM,
	561	.policy = batadv_netlink_policy,
	562	.dumpit = batadv_netlink_dump_hardifs,
	563	},
d34f0550 MS	564	{
	565	.cmd = BATADV_CMD_GET_TRANSTABLE_LOCAL,
	566	.flags = GENL_ADMIN_PERM,
	567	.policy = batadv_netlink_policy,
	568	.dumpit = batadv_tt_local_dump,
	569	},
	570	{
	571	.cmd = BATADV_CMD_GET_TRANSTABLE_GLOBAL,
	572	.flags = GENL_ADMIN_PERM,
	573	.policy = batadv_netlink_policy,
	574	.dumpit = batadv_tt_global_dump,
	575	},
85cf8c85 MS	576	{
	577	.cmd = BATADV_CMD_GET_ORIGINATORS,
	578	.flags = GENL_ADMIN_PERM,
	579	.policy = batadv_netlink_policy,
	580	.dumpit = batadv_orig_dump,
	581	},
	582	{
	583	.cmd = BATADV_CMD_GET_NEIGHBORS,
	584	.flags = GENL_ADMIN_PERM,
	585	.policy = batadv_netlink_policy,
	586	.dumpit = batadv_hardif_neigh_dump,
	587	},
d7129daf SE	588	{
	589	.cmd = BATADV_CMD_GET_GATEWAYS,
	590	.flags = GENL_ADMIN_PERM,
	591	.policy = batadv_netlink_policy,
	592	.dumpit = batadv_gw_dump,
	593	},
04f3f5bf AL	594	{
	595	.cmd = BATADV_CMD_GET_BLA_CLAIM,
	596	.flags = GENL_ADMIN_PERM,
	597	.policy = batadv_netlink_policy,
	598	.dumpit = batadv_bla_claim_dump,
	599	},
ea4152e1 SW	600	{
	601	.cmd = BATADV_CMD_GET_BLA_BACKBONE,
	602	.flags = GENL_ADMIN_PERM,
	603	.policy = batadv_netlink_policy,
	604	.dumpit = batadv_bla_backbone_dump,
	605	},
	606
09748a22 MS	607	};
09748a22 MS	608
56989f6d	609	struct genl_family batadv_netlink_family __ro_after_init = {
489111e5 JB	610	.hdrsize = 0,
	611	.name = BATADV_NL_NAME,
	612	.version = 1,
	613	.maxattr = BATADV_ATTR_MAX,
	614	.netnsok = true,
	615	.module = THIS_MODULE,
	616	.ops = batadv_netlink_ops,
	617	.n_ops = ARRAY_SIZE(batadv_netlink_ops),
	618	.mcgrps = batadv_netlink_mcgrps,
	619	.n_mcgrps = ARRAY_SIZE(batadv_netlink_mcgrps),
	620	};
	621
09748a22 MS	622	/**
	623	* batadv_netlink_register - register batadv genl netlink family
	624	*/
	625	void __init batadv_netlink_register(void)
	626	{
	627	int ret;
	628
489111e5	629	ret = genl_register_family(&batadv_netlink_family);
09748a22 MS	630	if (ret)
	631	pr_warn("unable to register netlink family");
	632	}
	633
	634	/**
	635	* batadv_netlink_unregister - unregister batadv genl netlink family
	636	*/
	637	void batadv_netlink_unregister(void)
	638	{
	639	genl_unregister_family(&batadv_netlink_family);
	640	}