[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, [email protected]
 *
 * 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;

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, [email protected]
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
489111e5	134	static struct genl_family hsr_genl_family;
f421436a	135
2a94fe48 JB	136	static const struct genl_multicast_group hsr_mcgrps[] = {
2a94fe48 JB	137	{ .name = "hsr-network", },
f421436a AB	138	};
	139
	140
	141
	142	/* This is called if for some node with MAC address addr, we only get frames
	143	* over one of the slave interfaces. This would indicate an open network ring
	144	* (i.e. a link has failed somewhere).
	145	*/
70ebe4a4	146	void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
c5a75911	147	struct hsr_port *port)
f421436a AB	148	{
	149	struct sk_buff *skb;
	150	void *msg_head;
c5a75911	151	struct hsr_port *master;
f421436a	152	int res;
f421436a AB	153
	154	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	155	if (!skb)
	156	goto fail;
	157
	158	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_RING_ERROR);
	159	if (!msg_head)
	160	goto nla_put_failure;
	161
	162	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	163	if (res < 0)
	164	goto nla_put_failure;
	165
c5a75911	166	res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
f421436a AB	167	if (res < 0)
	168	goto nla_put_failure;
	169
	170	genlmsg_end(skb, msg_head);
2a94fe48	171	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
f421436a AB	172
	173	return;
	174
	175	nla_put_failure:
	176	kfree_skb(skb);
	177
	178	fail:
c5a75911 AB	179	rcu_read_lock();
	180	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	181	netdev_warn(master->dev, "Could not send HSR ring error message\n");
	182	rcu_read_unlock();
f421436a AB	183	}
	184
	185	/* This is called when we haven't heard from the node with MAC address addr for
	186	* some time (just before the node is removed from the node table/list).
	187	*/
70ebe4a4	188	void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
f421436a AB	189	{
	190	struct sk_buff *skb;
	191	void *msg_head;
c5a75911	192	struct hsr_port *master;
f421436a AB	193	int res;
	194
	195	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	196	if (!skb)
	197	goto fail;
	198
	199	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
	200	if (!msg_head)
	201	goto nla_put_failure;
	202
	203
	204	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	205	if (res < 0)
	206	goto nla_put_failure;
	207
	208	genlmsg_end(skb, msg_head);
2a94fe48	209	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
f421436a AB	210
	211	return;
	212
	213	nla_put_failure:
	214	kfree_skb(skb);
	215
	216	fail:
c5a75911 AB	217	rcu_read_lock();
	218	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	219	netdev_warn(master->dev, "Could not send HSR node down\n");
	220	rcu_read_unlock();
f421436a AB	221	}
	222
	223
	224	/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
	225	* about the status of a specific node in the network, defined by its MAC
	226	* address.
	227	*
	228	* Input: hsr ifindex, node mac address
	229	* Output: hsr ifindex, node mac address (copied from request),
	230	* age of latest frame from node over slave 1, slave 2 [ms]
	231	*/
	232	static int hsr_get_node_status(struct sk_buff skb_in, struct genl_info info)
	233	{
	234	/* For receiving */
	235	struct nlattr *na;
c5a75911	236	struct net_device *hsr_dev;
f421436a AB	237
	238	/* For sending */
	239	struct sk_buff *skb_out;
	240	void *msg_head;
70ebe4a4	241	struct hsr_priv *hsr;
c5a75911	242	struct hsr_port *port;
f421436a AB	243	unsigned char hsr_node_addr_b[ETH_ALEN];
	244	int hsr_node_if1_age;
	245	u16 hsr_node_if1_seq;
	246	int hsr_node_if2_age;
	247	u16 hsr_node_if2_seq;
	248	int addr_b_ifindex;
	249	int res;
	250
	251	if (!info)
	252	goto invalid;
	253
	254	na = info->attrs[HSR_A_IFINDEX];
	255	if (!na)
	256	goto invalid;
	257	na = info->attrs[HSR_A_NODE_ADDR];
	258	if (!na)
	259	goto invalid;
	260
	261	hsr_dev = __dev_get_by_index(genl_info_net(info),
	262	nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	263	if (!hsr_dev)
	264	goto invalid;
	265	if (!is_hsr_master(hsr_dev))
	266	goto invalid;
	267
	268
	269	/* Send reply */
	270
	271	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	272	if (!skb_out) {
	273	res = -ENOMEM;
	274	goto fail;
	275	}
	276
	277	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
	278	info->snd_seq, &hsr_genl_family, 0,
	279	HSR_C_SET_NODE_STATUS);
	280	if (!msg_head) {
	281	res = -ENOMEM;
	282	goto nla_put_failure;
	283	}
	284
	285	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	286	if (res < 0)
	287	goto nla_put_failure;
	288
70ebe4a4 AB	289	hsr = netdev_priv(hsr_dev);
70ebe4a4 AB	290	res = hsr_get_node_data(hsr,
f421436a AB	291	(unsigned char *) nla_data(info->attrs[HSR_A_NODE_ADDR]),
	292	hsr_node_addr_b,
	293	&addr_b_ifindex,
	294	&hsr_node_if1_age,
	295	&hsr_node_if1_seq,
	296	&hsr_node_if2_age,
	297	&hsr_node_if2_seq);
	298	if (res < 0)
84a035f6	299	goto nla_put_failure;
f421436a AB	300
	301	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
	302	nla_data(info->attrs[HSR_A_NODE_ADDR]));
	303	if (res < 0)
	304	goto nla_put_failure;
	305
	306	if (addr_b_ifindex > -1) {
	307	res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
	308	hsr_node_addr_b);
	309	if (res < 0)
	310	goto nla_put_failure;
	311
	312	res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX, addr_b_ifindex);
	313	if (res < 0)
	314	goto nla_put_failure;
	315	}
	316
	317	res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
	318	if (res < 0)
	319	goto nla_put_failure;
	320	res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
	321	if (res < 0)
	322	goto nla_put_failure;
51f3c605	323	rcu_read_lock();
c5a75911 AB	324	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	325	if (port)
	326	res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
	327	port->dev->ifindex);
51f3c605	328	rcu_read_unlock();
f421436a AB	329	if (res < 0)
	330	goto nla_put_failure;
	331
	332	res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
	333	if (res < 0)
	334	goto nla_put_failure;
	335	res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
	336	if (res < 0)
	337	goto nla_put_failure;
51f3c605	338	rcu_read_lock();
c5a75911 AB	339	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	340	if (port)
	341	res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
	342	port->dev->ifindex);
51f3c605 AB	343	rcu_read_unlock();
	344	if (res < 0)
	345	goto nla_put_failure;
f421436a AB	346
	347	genlmsg_end(skb_out, msg_head);
	348	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
	349
	350	return 0;
	351
	352	invalid:
2d4bc933	353	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
f421436a AB	354	return 0;
	355
	356	nla_put_failure:
	357	kfree_skb(skb_out);
	358	/* Fall through */
	359
	360	fail:
	361	return res;
	362	}
	363
f266a683	364	/* Get a list of MacAddressA of all nodes known to this node (including self).
f421436a AB	365	*/
	366	static int hsr_get_node_list(struct sk_buff skb_in, struct genl_info info)
	367	{
	368	/* For receiving */
	369	struct nlattr *na;
	370	struct net_device *hsr_dev;
	371
	372	/* For sending */
	373	struct sk_buff *skb_out;
	374	void *msg_head;
70ebe4a4	375	struct hsr_priv *hsr;
f421436a AB	376	void *pos;
	377	unsigned char addr[ETH_ALEN];
	378	int res;
	379
	380	if (!info)
	381	goto invalid;
	382
	383	na = info->attrs[HSR_A_IFINDEX];
	384	if (!na)
	385	goto invalid;
	386
	387	hsr_dev = __dev_get_by_index(genl_info_net(info),
	388	nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	389	if (!hsr_dev)
	390	goto invalid;
	391	if (!is_hsr_master(hsr_dev))
	392	goto invalid;
	393
	394
	395	/* Send reply */
	396
	397	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	398	if (!skb_out) {
	399	res = -ENOMEM;
	400	goto fail;
	401	}
	402
	403	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
	404	info->snd_seq, &hsr_genl_family, 0,
	405	HSR_C_SET_NODE_LIST);
	406	if (!msg_head) {
	407	res = -ENOMEM;
	408	goto nla_put_failure;
	409	}
	410
	411	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	412	if (res < 0)
	413	goto nla_put_failure;
	414
70ebe4a4	415	hsr = netdev_priv(hsr_dev);
f421436a AB	416
f421436a AB	417	rcu_read_lock();
70ebe4a4	418	pos = hsr_get_next_node(hsr, NULL, addr);
f421436a AB	419	while (pos) {
	420	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	421	if (res < 0) {
	422	rcu_read_unlock();
	423	goto nla_put_failure;
	424	}
70ebe4a4	425	pos = hsr_get_next_node(hsr, pos, addr);
f421436a AB	426	}
	427	rcu_read_unlock();
	428
	429	genlmsg_end(skb_out, msg_head);
	430	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
	431
	432	return 0;
	433
	434	invalid:
2d4bc933	435	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
f421436a AB	436	return 0;
	437
	438	nla_put_failure:
	439	kfree_skb(skb_out);
	440	/* Fall through */
	441
	442	fail:
	443	return res;
	444	}
	445
	446
4534de83	447	static const struct genl_ops hsr_ops[] = {
9504b3ee JB	448	{
	449	.cmd = HSR_C_GET_NODE_STATUS,
	450	.flags = 0,
	451	.policy = hsr_genl_policy,
	452	.doit = hsr_get_node_status,
	453	.dumpit = NULL,
	454	},
	455	{
	456	.cmd = HSR_C_GET_NODE_LIST,
	457	.flags = 0,
	458	.policy = hsr_genl_policy,
	459	.doit = hsr_get_node_list,
	460	.dumpit = NULL,
	461	},
f421436a AB	462	};
f421436a AB	463
56989f6d	464	static struct genl_family hsr_genl_family __ro_after_init = {
489111e5 JB	465	.hdrsize = 0,
	466	.name = "HSR",
	467	.version = 1,
	468	.maxattr = HSR_A_MAX,
	469	.module = THIS_MODULE,
	470	.ops = hsr_ops,
	471	.n_ops = ARRAY_SIZE(hsr_ops),
	472	.mcgrps = hsr_mcgrps,
	473	.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
	474	};
	475
f421436a AB	476	int __init hsr_netlink_init(void)
	477	{
	478	int rc;
	479
	480	rc = rtnl_link_register(&hsr_link_ops);
	481	if (rc)
	482	goto fail_rtnl_link_register;
	483
489111e5	484	rc = genl_register_family(&hsr_genl_family);
f421436a AB	485	if (rc)
	486	goto fail_genl_register_family;
	487
f421436a AB	488	return 0;
f421436a AB	489
f421436a AB	490	fail_genl_register_family:
	491	rtnl_link_unregister(&hsr_link_ops);
	492	fail_rtnl_link_register:
	493
	494	return rc;
	495	}
	496
	497	void __exit hsr_netlink_exit(void)
	498	{
f421436a	499	genl_unregister_family(&hsr_genl_family);
f421436a AB	500	rtnl_link_unregister(&hsr_link_ops);
	501	}
	502
	503	MODULE_ALIAS_RTNL_LINK("hsr");