[mirror_ubuntu-artful-kernel.git] / net / hsr / hsr_netlink.c

/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * Author(s):
 *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
 *
 * Routines for handling Netlink messages for HSR.
 */

#include "hsr_netlink.h"
#include <linux/kernel.h>
#include <net/rtnetlink.h>
#include <net/genetlink.h>
#include "hsr_main.h"
#include "hsr_device.h"
#include "hsr_framereg.h"

static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
	[IFLA_HSR_SLAVE1]		= { .type = NLA_U32 },
	[IFLA_HSR_SLAVE2]		= { .type = NLA_U32 },
	[IFLA_HSR_MULTICAST_SPEC]	= { .type = NLA_U8 },
	[IFLA_HSR_VERSION]	= { .type = NLA_U8 },
	[IFLA_HSR_SUPERVISION_ADDR]	= { .len = ETH_ALEN },
	[IFLA_HSR_SEQ_NR]		= { .type = NLA_U16 },
};


/* Here, it seems a netdevice has already been allocated for us, and the
 * hsr_dev_setup routine has been executed. Nice!
 */
static int hsr_newlink(struct net *src_net, struct net_device *dev,
		       struct nlattr *tb[], struct nlattr *data[],
		       struct netlink_ext_ack *extack)
{
	struct net_device *link[2];
	unsigned char multicast_spec, hsr_version;

	if (!data) {
		netdev_info(dev, "HSR: No slave devices specified\n");
		return -EINVAL;
	}
	if (!data[IFLA_HSR_SLAVE1]) {
		netdev_info(dev, "HSR: Slave1 device not specified\n");
		return -EINVAL;
	}
	link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1]));
	if (!data[IFLA_HSR_SLAVE2]) {
		netdev_info(dev, "HSR: Slave2 device not specified\n");
		return -EINVAL;
	}
	link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2]));

	if (!link[0] || !link[1])
		return -ENODEV;
	if (link[0] == link[1])
		return -EINVAL;

	if (!data[IFLA_HSR_MULTICAST_SPEC])
		multicast_spec = 0;
	else
		multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);

	if (!data[IFLA_HSR_VERSION])
		hsr_version = 0;
	else
		hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);

	return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
}

static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
	struct hsr_priv *hsr;
	struct hsr_port *port;
	int res;

	hsr = netdev_priv(dev);

	res = 0;

	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	if (port)
		res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
	rcu_read_unlock();
	if (res)
		goto nla_put_failure;

	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	if (port)
		res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
	rcu_read_unlock();
	if (res)
		goto nla_put_failure;

	if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
		    hsr->sup_multicast_addr) ||
	    nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
		goto nla_put_failure;

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

static struct rtnl_link_ops hsr_link_ops __read_mostly = {
	.kind		= "hsr",
	.maxtype	= IFLA_HSR_MAX,
	.policy		= hsr_policy,
	.priv_size	= sizeof(struct hsr_priv),
	.setup		= hsr_dev_setup,
	.newlink	= hsr_newlink,
	.fill_info	= hsr_fill_info,
};


/* attribute policy */
static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
	[HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
	[HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
	[HSR_A_IFINDEX] = { .type = NLA_U32 },
	[HSR_A_IF1_AGE] = { .type = NLA_U32 },
	[HSR_A_IF2_AGE] = { .type = NLA_U32 },
	[HSR_A_IF1_SEQ] = { .type = NLA_U16 },
	[HSR_A_IF2_SEQ] = { .type = NLA_U16 },
};

static struct genl_family hsr_genl_family;

static const struct genl_multicast_group hsr_mcgrps[] = {
	{ .name = "hsr-network", },
};


/* This is called if for some node with MAC address addr, we only get frames
 * over one of the slave interfaces. This would indicate an open network ring
 * (i.e. a link has failed somewhere).
 */
void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
		      struct hsr_port *port)
{
	struct sk_buff *skb;
	void *msg_head;
	struct hsr_port *master;
	int res;

	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb)
		goto fail;

	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
	if (!msg_head)
		goto nla_put_failure;

	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	if (res < 0)
		goto nla_put_failure;

	res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb, msg_head);
	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);

	return;

nla_put_failure:
	kfree_skb(skb);

fail:
	rcu_read_lock();
	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	netdev_warn(master->dev, "Could not send HSR ring error message\n");
	rcu_read_unlock();
}

/* This is called when we haven't heard from the node with MAC address addr for
 * some time (just before the node is removed from the node table/list).
 */
void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
{
	struct sk_buff *skb;
	void *msg_head;
	struct hsr_port *master;
	int res;

	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	if (!skb)
		goto fail;

	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
	if (!msg_head)
		goto nla_put_failure;


	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb, msg_head);
	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);

	return;

nla_put_failure:
	kfree_skb(skb);

fail:
	rcu_read_lock();
	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	netdev_warn(master->dev, "Could not send HSR node down\n");
	rcu_read_unlock();
}


/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
 * about the status of a specific node in the network, defined by its MAC
 * address.
 *
 * Input: hsr ifindex, node mac address
 * Output: hsr ifindex, node mac address (copied from request),
 *	   age of latest frame from node over slave 1, slave 2 [ms]
 */
static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
{
	/* For receiving */
	struct nlattr *na;
	struct net_device *hsr_dev;

	/* For sending */
	struct sk_buff *skb_out;
	void *msg_head;
	struct hsr_priv *hsr;
	struct hsr_port *port;
	unsigned char hsr_node_addr_b[ETH_ALEN];
	int hsr_node_if1_age;
	u16 hsr_node_if1_seq;
	int hsr_node_if2_age;
	u16 hsr_node_if2_seq;
	int addr_b_ifindex;
	int res;

	if (!info)
		goto invalid;

	na = info->attrs[HSR_A_IFINDEX];
	if (!na)
		goto invalid;
	na = info->attrs[HSR_A_NODE_ADDR];
	if (!na)
		goto invalid;

	hsr_dev = __dev_get_by_index(genl_info_net(info),
					nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	if (!hsr_dev)
		goto invalid;
	if (!is_hsr_master(hsr_dev))
		goto invalid;


	/* Send reply */

	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb_out) {
		res = -ENOMEM;
		goto fail;
	}

	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
				info->snd_seq, &hsr_genl_family, 0,
				HSR_C_SET_NODE_STATUS);
	if (!msg_head) {
		res = -ENOMEM;
		goto nla_put_failure;
	}

	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	if (res < 0)
		goto nla_put_failure;

	hsr = netdev_priv(hsr_dev);
	res = hsr_get_node_data(hsr,
			(unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
			hsr_node_addr_b,
			&addr_b_ifindex,
			&hsr_node_if1_age,
			&hsr_node_if1_seq,
			&hsr_node_if2_age,
			&hsr_node_if2_seq);
	if (res < 0)
		goto nla_put_failure;

	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
					nla_data(info->attrs[HSR_A_NODE_ADDR]));
	if (res < 0)
		goto nla_put_failure;

	if (addr_b_ifindex > -1) {
		res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
								hsr_node_addr_b);
		if (res < 0)
			goto nla_put_failure;

		res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
		if (res < 0)
			goto nla_put_failure;
	}

	res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
	if (res < 0)
		goto nla_put_failure;
	res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
	if (res < 0)
		goto nla_put_failure;
	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	if (port)
		res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
				  port->dev->ifindex);
	rcu_read_unlock();
	if (res < 0)
		goto nla_put_failure;

	res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
	if (res < 0)
		goto nla_put_failure;
	res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
	if (res < 0)
		goto nla_put_failure;
	rcu_read_lock();
	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	if (port)
		res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
				  port->dev->ifindex);
	rcu_read_unlock();
	if (res < 0)
		goto nla_put_failure;

	genlmsg_end(skb_out, msg_head);
	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);

	return 0;

invalid:
	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
	return 0;

nla_put_failure:
	kfree_skb(skb_out);
	/* Fall through */

fail:
	return res;
}

/* Get a list of MacAddressA of all nodes known to this node (including self).
 */
static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
{
	/* For receiving */
	struct nlattr *na;
	struct net_device *hsr_dev;

	/* For sending */
	struct sk_buff *skb_out;
	void *msg_head;
	struct hsr_priv *hsr;
	void *pos;
	unsigned char addr[ETH_ALEN];
	int res;

	if (!info)
		goto invalid;

	na = info->attrs[HSR_A_IFINDEX];
	if (!na)
		goto invalid;

	hsr_dev = __dev_get_by_index(genl_info_net(info),
				     nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	if (!hsr_dev)
		goto invalid;
	if (!is_hsr_master(hsr_dev))
		goto invalid;


	/* Send reply */

	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	if (!skb_out) {
		res = -ENOMEM;
		goto fail;
	}

	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
				info->snd_seq, &hsr_genl_family, 0,
				HSR_C_SET_NODE_LIST);
	if (!msg_head) {
		res = -ENOMEM;
		goto nla_put_failure;
	}

	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	if (res < 0)
		goto nla_put_failure;

	hsr = netdev_priv(hsr_dev);

	rcu_read_lock();
	pos = hsr_get_next_node(hsr, NULL, addr);
	while (pos) {
		res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
		if (res < 0) {
			rcu_read_unlock();
			goto nla_put_failure;
		}
		pos = hsr_get_next_node(hsr, pos, addr);
	}
	rcu_read_unlock();

	genlmsg_end(skb_out, msg_head);
	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);

	return 0;

invalid:
	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
	return 0;

nla_put_failure:
	kfree_skb(skb_out);
	/* Fall through */

fail:
	return res;
}


static const struct genl_ops hsr_ops[] = {
	{
		.cmd = HSR_C_GET_NODE_STATUS,
		.flags = 0,
		.policy = hsr_genl_policy,
		.doit = hsr_get_node_status,
		.dumpit = NULL,
	},
	{
		.cmd = HSR_C_GET_NODE_LIST,
		.flags = 0,
		.policy = hsr_genl_policy,
		.doit = hsr_get_node_list,
		.dumpit = NULL,
	},
};

static struct genl_family hsr_genl_family __ro_after_init = {
	.hdrsize = 0,
	.name = "HSR",
	.version = 1,
	.maxattr = HSR_A_MAX,
	.module = THIS_MODULE,
	.ops = hsr_ops,
	.n_ops = ARRAY_SIZE(hsr_ops),
	.mcgrps = hsr_mcgrps,
	.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
};

int __init hsr_netlink_init(void)
{
	int rc;

	rc = rtnl_link_register(&hsr_link_ops);
	if (rc)
		goto fail_rtnl_link_register;

	rc = genl_register_family(&hsr_genl_family);
	if (rc)
		goto fail_genl_register_family;

	return 0;

fail_genl_register_family:
	rtnl_link_unregister(&hsr_link_ops);
fail_rtnl_link_register:

	return rc;
}

void __exit hsr_netlink_exit(void)
{
	genl_unregister_family(&hsr_genl_family);
	rtnl_link_unregister(&hsr_link_ops);
}

MODULE_ALIAS_RTNL_LINK("hsr");
Commit	Line	Data
70ebe4a4	1	/* Copyright 2011-2014 Autronica Fire and Security AS
f421436a AB	2	*
	3	* This program is free software; you can redistribute it and/or modify it
	4	* under the terms of the GNU General Public License as published by the Free
	5	* Software Foundation; either version 2 of the License, or (at your option)
	6	* any later version.
	7	*
	8	* Author(s):
70ebe4a4	9	* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
f421436a AB	10	*
	11	* Routines for handling Netlink messages for HSR.
	12	*/
	13
	14	#include "hsr_netlink.h"
	15	#include <linux/kernel.h>
	16	#include <net/rtnetlink.h>
	17	#include <net/genetlink.h>
	18	#include "hsr_main.h"
	19	#include "hsr_device.h"
	20	#include "hsr_framereg.h"
	21
	22	static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
	23	[IFLA_HSR_SLAVE1] = { .type = NLA_U32 },
	24	[IFLA_HSR_SLAVE2] = { .type = NLA_U32 },
	25	[IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 },
ee1c2797	26	[IFLA_HSR_VERSION] = { .type = NLA_U8 },
f9375729	27	[IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN },
98bf8362	28	[IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
f421436a AB	29	};
	30
	31
	32	/* Here, it seems a netdevice has already been allocated for us, and the
	33	* hsr_dev_setup routine has been executed. Nice!
	34	*/
	35	static int hsr_newlink(struct net src_net, struct net_device dev,
7a3f4a18 MS	36	struct nlattr tb[], struct nlattr data[],
7a3f4a18 MS	37	struct netlink_ext_ack *extack)
f421436a AB	38	{
f421436a AB	39	struct net_device *link[2];
ee1c2797	40	unsigned char multicast_spec, hsr_version;
f421436a	41
a718dcc5 AB	42	if (!data) {
	43	netdev_info(dev, "HSR: No slave devices specified\n");
	44	return -EINVAL;
	45	}
f421436a	46	if (!data[IFLA_HSR_SLAVE1]) {
a718dcc5	47	netdev_info(dev, "HSR: Slave1 device not specified\n");
f421436a AB	48	return -EINVAL;
	49	}
	50	link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1]));
	51	if (!data[IFLA_HSR_SLAVE2]) {
a718dcc5	52	netdev_info(dev, "HSR: Slave2 device not specified\n");
f421436a AB	53	return -EINVAL;
	54	}
	55	link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2]));
	56
	57	if (!link[0] \|\| !link[1])
	58	return -ENODEV;
	59	if (link[0] == link[1])
	60	return -EINVAL;
	61
	62	if (!data[IFLA_HSR_MULTICAST_SPEC])
	63	multicast_spec = 0;
	64	else
	65	multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
	66
ee1c2797 PH	67	if (!data[IFLA_HSR_VERSION])
	68	hsr_version = 0;
	69	else
	70	hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
	71
	72	return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
f421436a AB	73	}
f421436a AB	74
98bf8362 AB	75	static int hsr_fill_info(struct sk_buff skb, const struct net_device dev)
98bf8362 AB	76	{
70ebe4a4	77	struct hsr_priv *hsr;
c5a75911	78	struct hsr_port *port;
51f3c605	79	int res;
98bf8362	80
70ebe4a4	81	hsr = netdev_priv(dev);
98bf8362	82
51f3c605	83	res = 0;
98bf8362	84
51f3c605	85	rcu_read_lock();
c5a75911 AB	86	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	87	if (port)
	88	res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
51f3c605 AB	89	rcu_read_unlock();
	90	if (res)
	91	goto nla_put_failure;
	92
	93	rcu_read_lock();
c5a75911 AB	94	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	95	if (port)
	96	res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
51f3c605 AB	97	rcu_read_unlock();
	98	if (res)
	99	goto nla_put_failure;
98bf8362 AB	100
98bf8362 AB	101	if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
70ebe4a4 AB	102	hsr->sup_multicast_addr) \|\|
70ebe4a4 AB	103	nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
98bf8362 AB	104	goto nla_put_failure;
	105
	106	return 0;
	107
	108	nla_put_failure:
	109	return -EMSGSIZE;
	110	}
	111
f421436a AB	112	static struct rtnl_link_ops hsr_link_ops __read_mostly = {
	113	.kind = "hsr",
	114	.maxtype = IFLA_HSR_MAX,
	115	.policy = hsr_policy,
	116	.priv_size = sizeof(struct hsr_priv),
	117	.setup = hsr_dev_setup,
	118	.newlink = hsr_newlink,
98bf8362	119	.fill_info = hsr_fill_info,
f421436a AB	120	};
	121
	122
	123
	124	/* attribute policy */
f421436a	125	static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
f9375729 PH	126	[HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
f9375729 PH	127	[HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
f421436a AB	128	[HSR_A_IFINDEX] = { .type = NLA_U32 },
	129	[HSR_A_IF1_AGE] = { .type = NLA_U32 },
	130	[HSR_A_IF2_AGE] = { .type = NLA_U32 },
	131	[HSR_A_IF1_SEQ] = { .type = NLA_U16 },
	132	[HSR_A_IF2_SEQ] = { .type = NLA_U16 },
	133	};
	134
489111e5	135	static struct genl_family hsr_genl_family;
f421436a	136
2a94fe48 JB	137	static const struct genl_multicast_group hsr_mcgrps[] = {
2a94fe48 JB	138	{ .name = "hsr-network", },
f421436a AB	139	};
	140
	141
	142
	143	/* This is called if for some node with MAC address addr, we only get frames
	144	* over one of the slave interfaces. This would indicate an open network ring
	145	* (i.e. a link has failed somewhere).
	146	*/
70ebe4a4	147	void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
c5a75911	148	struct hsr_port *port)
f421436a AB	149	{
	150	struct sk_buff *skb;
	151	void *msg_head;
c5a75911	152	struct hsr_port *master;
f421436a	153	int res;
f421436a AB	154
	155	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	156	if (!skb)
	157	goto fail;
	158
	159	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
	160	if (!msg_head)
	161	goto nla_put_failure;
	162
	163	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	164	if (res < 0)
	165	goto nla_put_failure;
	166
c5a75911	167	res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
f421436a AB	168	if (res < 0)
	169	goto nla_put_failure;
	170
	171	genlmsg_end(skb, msg_head);
2a94fe48	172	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
f421436a AB	173
	174	return;
	175
	176	nla_put_failure:
	177	kfree_skb(skb);
	178
	179	fail:
c5a75911 AB	180	rcu_read_lock();
	181	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	182	netdev_warn(master->dev, "Could not send HSR ring error message\n");
	183	rcu_read_unlock();
f421436a AB	184	}
	185
	186	/* This is called when we haven't heard from the node with MAC address addr for
	187	* some time (just before the node is removed from the node table/list).
	188	*/
70ebe4a4	189	void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
f421436a AB	190	{
	191	struct sk_buff *skb;
	192	void *msg_head;
c5a75911	193	struct hsr_port *master;
f421436a AB	194	int res;
	195
	196	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	197	if (!skb)
	198	goto fail;
	199
	200	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
	201	if (!msg_head)
	202	goto nla_put_failure;
	203
	204
	205	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	206	if (res < 0)
	207	goto nla_put_failure;
	208
	209	genlmsg_end(skb, msg_head);
2a94fe48	210	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
f421436a AB	211
	212	return;
	213
	214	nla_put_failure:
	215	kfree_skb(skb);
	216
	217	fail:
c5a75911 AB	218	rcu_read_lock();
	219	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	220	netdev_warn(master->dev, "Could not send HSR node down\n");
	221	rcu_read_unlock();
f421436a AB	222	}
	223
	224
	225	/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
	226	* about the status of a specific node in the network, defined by its MAC
	227	* address.
	228	*
	229	* Input: hsr ifindex, node mac address
	230	* Output: hsr ifindex, node mac address (copied from request),
	231	* age of latest frame from node over slave 1, slave 2 [ms]
	232	*/
	233	static int hsr_get_node_status(struct sk_buff skb_in, struct genl_info info)
	234	{
	235	/* For receiving */
	236	struct nlattr *na;
c5a75911	237	struct net_device *hsr_dev;
f421436a AB	238
	239	/* For sending */
	240	struct sk_buff *skb_out;
	241	void *msg_head;
70ebe4a4	242	struct hsr_priv *hsr;
c5a75911	243	struct hsr_port *port;
f421436a AB	244	unsigned char hsr_node_addr_b[ETH_ALEN];
	245	int hsr_node_if1_age;
	246	u16 hsr_node_if1_seq;
	247	int hsr_node_if2_age;
	248	u16 hsr_node_if2_seq;
	249	int addr_b_ifindex;
	250	int res;
	251
	252	if (!info)
	253	goto invalid;
	254
	255	na = info->attrs[HSR_A_IFINDEX];
	256	if (!na)
	257	goto invalid;
	258	na = info->attrs[HSR_A_NODE_ADDR];
	259	if (!na)
	260	goto invalid;
	261
	262	hsr_dev = __dev_get_by_index(genl_info_net(info),
	263	nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	264	if (!hsr_dev)
	265	goto invalid;
	266	if (!is_hsr_master(hsr_dev))
	267	goto invalid;
	268
	269
	270	/* Send reply */
	271
	272	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	273	if (!skb_out) {
	274	res = -ENOMEM;
	275	goto fail;
	276	}
	277
	278	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
	279	info->snd_seq, &hsr_genl_family, 0,
	280	HSR_C_SET_NODE_STATUS);
	281	if (!msg_head) {
	282	res = -ENOMEM;
	283	goto nla_put_failure;
	284	}
	285
	286	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	287	if (res < 0)
	288	goto nla_put_failure;
	289
70ebe4a4 AB	290	hsr = netdev_priv(hsr_dev);
70ebe4a4 AB	291	res = hsr_get_node_data(hsr,
f421436a AB	292	(unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
	293	hsr_node_addr_b,
	294	&addr_b_ifindex,
	295	&hsr_node_if1_age,
	296	&hsr_node_if1_seq,
	297	&hsr_node_if2_age,
	298	&hsr_node_if2_seq);
	299	if (res < 0)
84a035f6	300	goto nla_put_failure;
f421436a AB	301
	302	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
	303	nla_data(info->attrs[HSR_A_NODE_ADDR]));
	304	if (res < 0)
	305	goto nla_put_failure;
	306
	307	if (addr_b_ifindex > -1) {
	308	res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
	309	hsr_node_addr_b);
	310	if (res < 0)
	311	goto nla_put_failure;
	312
	313	res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
	314	if (res < 0)
	315	goto nla_put_failure;
	316	}
	317
	318	res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
	319	if (res < 0)
	320	goto nla_put_failure;
	321	res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
	322	if (res < 0)
	323	goto nla_put_failure;
51f3c605	324	rcu_read_lock();
c5a75911 AB	325	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	326	if (port)
	327	res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
	328	port->dev->ifindex);
51f3c605	329	rcu_read_unlock();
f421436a AB	330	if (res < 0)
	331	goto nla_put_failure;
	332
	333	res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
	334	if (res < 0)
	335	goto nla_put_failure;
	336	res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
	337	if (res < 0)
	338	goto nla_put_failure;
51f3c605	339	rcu_read_lock();
c5a75911 AB	340	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	341	if (port)
	342	res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
	343	port->dev->ifindex);
51f3c605 AB	344	rcu_read_unlock();
	345	if (res < 0)
	346	goto nla_put_failure;
f421436a AB	347
	348	genlmsg_end(skb_out, msg_head);
	349	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
	350
	351	return 0;
	352
	353	invalid:
2d4bc933	354	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
f421436a AB	355	return 0;
	356
	357	nla_put_failure:
	358	kfree_skb(skb_out);
	359	/* Fall through */
	360
	361	fail:
	362	return res;
	363	}
	364
f266a683	365	/* Get a list of MacAddressA of all nodes known to this node (including self).
f421436a AB	366	*/
	367	static int hsr_get_node_list(struct sk_buff skb_in, struct genl_info info)
	368	{
	369	/* For receiving */
	370	struct nlattr *na;
	371	struct net_device *hsr_dev;
	372
	373	/* For sending */
	374	struct sk_buff *skb_out;
	375	void *msg_head;
70ebe4a4	376	struct hsr_priv *hsr;
f421436a AB	377	void *pos;
	378	unsigned char addr[ETH_ALEN];
	379	int res;
	380
	381	if (!info)
	382	goto invalid;
	383
	384	na = info->attrs[HSR_A_IFINDEX];
	385	if (!na)
	386	goto invalid;
	387
	388	hsr_dev = __dev_get_by_index(genl_info_net(info),
	389	nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	390	if (!hsr_dev)
	391	goto invalid;
	392	if (!is_hsr_master(hsr_dev))
	393	goto invalid;
	394
	395
	396	/* Send reply */
	397
	398	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	399	if (!skb_out) {
	400	res = -ENOMEM;
	401	goto fail;
	402	}
	403
	404	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
	405	info->snd_seq, &hsr_genl_family, 0,
	406	HSR_C_SET_NODE_LIST);
	407	if (!msg_head) {
	408	res = -ENOMEM;
	409	goto nla_put_failure;
	410	}
	411
	412	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	413	if (res < 0)
	414	goto nla_put_failure;
	415
70ebe4a4	416	hsr = netdev_priv(hsr_dev);
f421436a AB	417
f421436a AB	418	rcu_read_lock();
70ebe4a4	419	pos = hsr_get_next_node(hsr, NULL, addr);
f421436a AB	420	while (pos) {
	421	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	422	if (res < 0) {
	423	rcu_read_unlock();
	424	goto nla_put_failure;
	425	}
70ebe4a4	426	pos = hsr_get_next_node(hsr, pos, addr);
f421436a AB	427	}
	428	rcu_read_unlock();
	429
	430	genlmsg_end(skb_out, msg_head);
	431	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
	432
	433	return 0;
	434
	435	invalid:
2d4bc933	436	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
f421436a AB	437	return 0;
	438
	439	nla_put_failure:
	440	kfree_skb(skb_out);
	441	/* Fall through */
	442
	443	fail:
	444	return res;
	445	}
	446
	447
4534de83	448	static const struct genl_ops hsr_ops[] = {
9504b3ee JB	449	{
	450	.cmd = HSR_C_GET_NODE_STATUS,
	451	.flags = 0,
	452	.policy = hsr_genl_policy,
	453	.doit = hsr_get_node_status,
	454	.dumpit = NULL,
	455	},
	456	{
	457	.cmd = HSR_C_GET_NODE_LIST,
	458	.flags = 0,
	459	.policy = hsr_genl_policy,
	460	.doit = hsr_get_node_list,
	461	.dumpit = NULL,
	462	},
f421436a AB	463	};
f421436a AB	464
56989f6d	465	static struct genl_family hsr_genl_family __ro_after_init = {
489111e5 JB	466	.hdrsize = 0,
	467	.name = "HSR",
	468	.version = 1,
	469	.maxattr = HSR_A_MAX,
	470	.module = THIS_MODULE,
	471	.ops = hsr_ops,
	472	.n_ops = ARRAY_SIZE(hsr_ops),
	473	.mcgrps = hsr_mcgrps,
	474	.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
	475	};
	476
f421436a AB	477	int __init hsr_netlink_init(void)
	478	{
	479	int rc;
	480
	481	rc = rtnl_link_register(&hsr_link_ops);
	482	if (rc)
	483	goto fail_rtnl_link_register;
	484
489111e5	485	rc = genl_register_family(&hsr_genl_family);
f421436a AB	486	if (rc)
	487	goto fail_genl_register_family;
	488
f421436a AB	489	return 0;
f421436a AB	490
f421436a AB	491	fail_genl_register_family:
	492	rtnl_link_unregister(&hsr_link_ops);
	493	fail_rtnl_link_register:
	494
	495	return rc;
	496	}
	497
	498	void __exit hsr_netlink_exit(void)
	499	{
f421436a	500	genl_unregister_family(&hsr_genl_family);
f421436a AB	501	rtnl_link_unregister(&hsr_link_ops);
	502	}
	503
	504	MODULE_ALIAS_RTNL_LINK("hsr");