[deliverable/linux.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 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 = {
	.id = GENL_ID_GENERATE,
	.hdrsize = 0,
	.name = "HSR",
	.version = 1,
	.maxattr = HSR_A_MAX,
};

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);
	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);
	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,
	},
};

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