[linux-2.6-block.git] / net / hsr / hsr_netlink.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright 2011-2014 Autronica Fire and Security AS
 *
 * 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,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.flags = 0,
		.doit = hsr_get_node_status,
		.dumpit = NULL,
	},
	{
		.cmd = HSR_C_GET_NODE_LIST,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.flags = 0,
		.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,
	.policy = hsr_genl_policy,
	.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
0e7623bd	1	// SPDX-License-Identifier: GPL-2.0
70ebe4a4	2	/* Copyright 2011-2014 Autronica Fire and Security AS
f421436a AB	3	*
f421436a AB	4	* Author(s):
70ebe4a4	5	* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
f421436a AB	6	*
	7	* Routines for handling Netlink messages for HSR.
	8	*/
	9
	10	#include "hsr_netlink.h"
	11	#include <linux/kernel.h>
	12	#include <net/rtnetlink.h>
	13	#include <net/genetlink.h>
	14	#include "hsr_main.h"
	15	#include "hsr_device.h"
	16	#include "hsr_framereg.h"
	17
	18	static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
	19	[IFLA_HSR_SLAVE1] = { .type = NLA_U32 },
	20	[IFLA_HSR_SLAVE2] = { .type = NLA_U32 },
	21	[IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 },
ee1c2797	22	[IFLA_HSR_VERSION] = { .type = NLA_U8 },
f9375729	23	[IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN },
98bf8362	24	[IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
f421436a AB	25	};
f421436a AB	26
f421436a AB	27	/* Here, it seems a netdevice has already been allocated for us, and the
	28	* hsr_dev_setup routine has been executed. Nice!
	29	*/
	30	static int hsr_newlink(struct net src_net, struct net_device dev,
7a3f4a18 MS	31	struct nlattr tb[], struct nlattr data[],
7a3f4a18 MS	32	struct netlink_ext_ack *extack)
f421436a AB	33	{
f421436a AB	34	struct net_device *link[2];
ee1c2797	35	unsigned char multicast_spec, hsr_version;
f421436a	36
a718dcc5 AB	37	if (!data) {
	38	netdev_info(dev, "HSR: No slave devices specified\n");
	39	return -EINVAL;
	40	}
f421436a	41	if (!data[IFLA_HSR_SLAVE1]) {
a718dcc5	42	netdev_info(dev, "HSR: Slave1 device not specified\n");
f421436a AB	43	return -EINVAL;
f421436a AB	44	}
d595b85a MK	45	link[0] = __dev_get_by_index(src_net,
d595b85a MK	46	nla_get_u32(data[IFLA_HSR_SLAVE1]));
f421436a	47	if (!data[IFLA_HSR_SLAVE2]) {
a718dcc5	48	netdev_info(dev, "HSR: Slave2 device not specified\n");
f421436a AB	49	return -EINVAL;
f421436a AB	50	}
d595b85a MK	51	link[1] = __dev_get_by_index(src_net,
d595b85a MK	52	nla_get_u32(data[IFLA_HSR_SLAVE2]));
f421436a AB	53
	54	if (!link[0] \|\| !link[1])
	55	return -ENODEV;
	56	if (link[0] == link[1])
	57	return -EINVAL;
	58
	59	if (!data[IFLA_HSR_MULTICAST_SPEC])
	60	multicast_spec = 0;
	61	else
	62	multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
	63
ee1c2797 PH	64	if (!data[IFLA_HSR_VERSION])
	65	hsr_version = 0;
	66	else
	67	hsr_version = nla_get_u8(data[IFLA_HSR_VERSION]);
	68
	69	return hsr_dev_finalize(dev, link, multicast_spec, hsr_version);
f421436a AB	70	}
f421436a AB	71
98bf8362 AB	72	static int hsr_fill_info(struct sk_buff skb, const struct net_device dev)
98bf8362 AB	73	{
70ebe4a4	74	struct hsr_priv *hsr;
c5a75911	75	struct hsr_port *port;
51f3c605	76	int res;
98bf8362	77
70ebe4a4	78	hsr = netdev_priv(dev);
98bf8362	79
51f3c605	80	res = 0;
98bf8362	81
51f3c605	82	rcu_read_lock();
c5a75911 AB	83	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	84	if (port)
	85	res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
51f3c605 AB	86	rcu_read_unlock();
	87	if (res)
	88	goto nla_put_failure;
	89
	90	rcu_read_lock();
c5a75911 AB	91	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	92	if (port)
	93	res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
51f3c605 AB	94	rcu_read_unlock();
	95	if (res)
	96	goto nla_put_failure;
98bf8362 AB	97
98bf8362 AB	98	if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
70ebe4a4 AB	99	hsr->sup_multicast_addr) \|\|
70ebe4a4 AB	100	nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
98bf8362 AB	101	goto nla_put_failure;
	102
	103	return 0;
	104
	105	nla_put_failure:
	106	return -EMSGSIZE;
	107	}
	108
f421436a AB	109	static struct rtnl_link_ops hsr_link_ops __read_mostly = {
	110	.kind = "hsr",
	111	.maxtype = IFLA_HSR_MAX,
	112	.policy = hsr_policy,
	113	.priv_size = sizeof(struct hsr_priv),
	114	.setup = hsr_dev_setup,
	115	.newlink = hsr_newlink,
98bf8362	116	.fill_info = hsr_fill_info,
f421436a AB	117	};
f421436a AB	118
f421436a	119	/* attribute policy */
f421436a	120	static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
f9375729 PH	121	[HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
f9375729 PH	122	[HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
f421436a AB	123	[HSR_A_IFINDEX] = { .type = NLA_U32 },
	124	[HSR_A_IF1_AGE] = { .type = NLA_U32 },
	125	[HSR_A_IF2_AGE] = { .type = NLA_U32 },
	126	[HSR_A_IF1_SEQ] = { .type = NLA_U16 },
	127	[HSR_A_IF2_SEQ] = { .type = NLA_U16 },
	128	};
	129
489111e5	130	static struct genl_family hsr_genl_family;
f421436a	131
2a94fe48 JB	132	static const struct genl_multicast_group hsr_mcgrps[] = {
2a94fe48 JB	133	{ .name = "hsr-network", },
f421436a AB	134	};
f421436a AB	135
f421436a AB	136	/* This is called if for some node with MAC address addr, we only get frames
	137	* over one of the slave interfaces. This would indicate an open network ring
	138	* (i.e. a link has failed somewhere).
	139	*/
70ebe4a4	140	void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
c5a75911	141	struct hsr_port *port)
f421436a AB	142	{
	143	struct sk_buff *skb;
	144	void *msg_head;
c5a75911	145	struct hsr_port *master;
f421436a	146	int res;
f421436a AB	147
	148	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	149	if (!skb)
	150	goto fail;
	151
d595b85a MK	152	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0,
d595b85a MK	153	HSR_C_RING_ERROR);
f421436a AB	154	if (!msg_head)
	155	goto nla_put_failure;
	156
	157	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	158	if (res < 0)
	159	goto nla_put_failure;
	160
c5a75911	161	res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
f421436a AB	162	if (res < 0)
	163	goto nla_put_failure;
	164
	165	genlmsg_end(skb, msg_head);
2a94fe48	166	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
f421436a AB	167
	168	return;
	169
	170	nla_put_failure:
	171	kfree_skb(skb);
	172
	173	fail:
c5a75911 AB	174	rcu_read_lock();
	175	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	176	netdev_warn(master->dev, "Could not send HSR ring error message\n");
	177	rcu_read_unlock();
f421436a AB	178	}
	179
	180	/* This is called when we haven't heard from the node with MAC address addr for
	181	* some time (just before the node is removed from the node table/list).
	182	*/
70ebe4a4	183	void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
f421436a AB	184	{
	185	struct sk_buff *skb;
	186	void *msg_head;
c5a75911	187	struct hsr_port *master;
f421436a AB	188	int res;
	189
	190	skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
	191	if (!skb)
	192	goto fail;
	193
	194	msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
	195	if (!msg_head)
	196	goto nla_put_failure;
	197
f421436a AB	198	res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	199	if (res < 0)
	200	goto nla_put_failure;
	201
	202	genlmsg_end(skb, msg_head);
2a94fe48	203	genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
f421436a AB	204
	205	return;
	206
	207	nla_put_failure:
	208	kfree_skb(skb);
	209
	210	fail:
c5a75911 AB	211	rcu_read_lock();
	212	master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
	213	netdev_warn(master->dev, "Could not send HSR node down\n");
	214	rcu_read_unlock();
f421436a AB	215	}
f421436a AB	216
f421436a AB	217	/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
	218	* about the status of a specific node in the network, defined by its MAC
	219	* address.
	220	*
	221	* Input: hsr ifindex, node mac address
	222	* Output: hsr ifindex, node mac address (copied from request),
	223	* age of latest frame from node over slave 1, slave 2 [ms]
	224	*/
	225	static int hsr_get_node_status(struct sk_buff skb_in, struct genl_info info)
	226	{
	227	/* For receiving */
	228	struct nlattr *na;
c5a75911	229	struct net_device *hsr_dev;
f421436a AB	230
	231	/* For sending */
	232	struct sk_buff *skb_out;
	233	void *msg_head;
70ebe4a4	234	struct hsr_priv *hsr;
c5a75911	235	struct hsr_port *port;
f421436a AB	236	unsigned char hsr_node_addr_b[ETH_ALEN];
	237	int hsr_node_if1_age;
	238	u16 hsr_node_if1_seq;
	239	int hsr_node_if2_age;
	240	u16 hsr_node_if2_seq;
	241	int addr_b_ifindex;
	242	int res;
	243
	244	if (!info)
	245	goto invalid;
	246
	247	na = info->attrs[HSR_A_IFINDEX];
	248	if (!na)
	249	goto invalid;
	250	na = info->attrs[HSR_A_NODE_ADDR];
	251	if (!na)
	252	goto invalid;
	253
	254	hsr_dev = __dev_get_by_index(genl_info_net(info),
d595b85a	255	nla_get_u32(info->attrs[HSR_A_IFINDEX]));
f421436a AB	256	if (!hsr_dev)
	257	goto invalid;
	258	if (!is_hsr_master(hsr_dev))
	259	goto invalid;
	260
f421436a	261	/* Send reply */
f421436a AB	262	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	263	if (!skb_out) {
	264	res = -ENOMEM;
	265	goto fail;
	266	}
	267
	268	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
4fe25bd8 MK	269	info->snd_seq, &hsr_genl_family, 0,
4fe25bd8 MK	270	HSR_C_SET_NODE_STATUS);
f421436a AB	271	if (!msg_head) {
	272	res = -ENOMEM;
	273	goto nla_put_failure;
	274	}
	275
	276	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	277	if (res < 0)
	278	goto nla_put_failure;
	279
70ebe4a4 AB	280	hsr = netdev_priv(hsr_dev);
70ebe4a4 AB	281	res = hsr_get_node_data(hsr,
d595b85a MK	282	(unsigned char *)
	283	nla_data(info->attrs[HSR_A_NODE_ADDR]),
	284	hsr_node_addr_b,
	285	&addr_b_ifindex,
	286	&hsr_node_if1_age,
	287	&hsr_node_if1_seq,
	288	&hsr_node_if2_age,
	289	&hsr_node_if2_seq);
f421436a	290	if (res < 0)
84a035f6	291	goto nla_put_failure;
f421436a AB	292
f421436a AB	293	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
4fe25bd8	294	nla_data(info->attrs[HSR_A_NODE_ADDR]));
f421436a AB	295	if (res < 0)
	296	goto nla_put_failure;
	297
	298	if (addr_b_ifindex > -1) {
	299	res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
d595b85a	300	hsr_node_addr_b);
f421436a AB	301	if (res < 0)
	302	goto nla_put_failure;
	303
d595b85a MK	304	res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX,
d595b85a MK	305	addr_b_ifindex);
f421436a AB	306	if (res < 0)
	307	goto nla_put_failure;
	308	}
	309
	310	res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
	311	if (res < 0)
	312	goto nla_put_failure;
	313	res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
	314	if (res < 0)
	315	goto nla_put_failure;
51f3c605	316	rcu_read_lock();
c5a75911 AB	317	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
	318	if (port)
	319	res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
	320	port->dev->ifindex);
51f3c605	321	rcu_read_unlock();
f421436a AB	322	if (res < 0)
	323	goto nla_put_failure;
	324
	325	res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
	326	if (res < 0)
	327	goto nla_put_failure;
	328	res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
	329	if (res < 0)
	330	goto nla_put_failure;
51f3c605	331	rcu_read_lock();
c5a75911 AB	332	port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
	333	if (port)
	334	res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
	335	port->dev->ifindex);
51f3c605 AB	336	rcu_read_unlock();
	337	if (res < 0)
	338	goto nla_put_failure;
f421436a AB	339
	340	genlmsg_end(skb_out, msg_head);
	341	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
	342
	343	return 0;
	344
	345	invalid:
2d4bc933	346	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
f421436a AB	347	return 0;
	348
	349	nla_put_failure:
	350	kfree_skb(skb_out);
	351	/* Fall through */
	352
	353	fail:
	354	return res;
	355	}
	356
f266a683	357	/* Get a list of MacAddressA of all nodes known to this node (including self).
f421436a AB	358	*/
	359	static int hsr_get_node_list(struct sk_buff skb_in, struct genl_info info)
	360	{
	361	/* For receiving */
	362	struct nlattr *na;
	363	struct net_device *hsr_dev;
	364
	365	/* For sending */
	366	struct sk_buff *skb_out;
	367	void *msg_head;
70ebe4a4	368	struct hsr_priv *hsr;
f421436a AB	369	void *pos;
	370	unsigned char addr[ETH_ALEN];
	371	int res;
	372
	373	if (!info)
	374	goto invalid;
	375
	376	na = info->attrs[HSR_A_IFINDEX];
	377	if (!na)
	378	goto invalid;
	379
	380	hsr_dev = __dev_get_by_index(genl_info_net(info),
	381	nla_get_u32(info->attrs[HSR_A_IFINDEX]));
	382	if (!hsr_dev)
	383	goto invalid;
	384	if (!is_hsr_master(hsr_dev))
	385	goto invalid;
	386
f421436a	387	/* Send reply */
f421436a AB	388	skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
	389	if (!skb_out) {
	390	res = -ENOMEM;
	391	goto fail;
	392	}
	393
	394	msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
4fe25bd8 MK	395	info->snd_seq, &hsr_genl_family, 0,
4fe25bd8 MK	396	HSR_C_SET_NODE_LIST);
f421436a AB	397	if (!msg_head) {
	398	res = -ENOMEM;
	399	goto nla_put_failure;
	400	}
	401
	402	res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
	403	if (res < 0)
	404	goto nla_put_failure;
	405
70ebe4a4	406	hsr = netdev_priv(hsr_dev);
f421436a AB	407
f421436a AB	408	rcu_read_lock();
70ebe4a4	409	pos = hsr_get_next_node(hsr, NULL, addr);
f421436a AB	410	while (pos) {
	411	res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
	412	if (res < 0) {
	413	rcu_read_unlock();
	414	goto nla_put_failure;
	415	}
70ebe4a4	416	pos = hsr_get_next_node(hsr, pos, addr);
f421436a AB	417	}
	418	rcu_read_unlock();
	419
	420	genlmsg_end(skb_out, msg_head);
	421	genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
	422
	423	return 0;
	424
	425	invalid:
2d4bc933	426	netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
f421436a AB	427	return 0;
	428
	429	nla_put_failure:
	430	kfree_skb(skb_out);
	431	/* Fall through */
	432
	433	fail:
	434	return res;
	435	}
	436
4534de83	437	static const struct genl_ops hsr_ops[] = {
9504b3ee JB	438	{
9504b3ee JB	439	.cmd = HSR_C_GET_NODE_STATUS,
ef6243ac	440	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
9504b3ee	441	.flags = 0,
9504b3ee JB	442	.doit = hsr_get_node_status,
	443	.dumpit = NULL,
	444	},
	445	{
	446	.cmd = HSR_C_GET_NODE_LIST,
ef6243ac	447	.validate = GENL_DONT_VALIDATE_STRICT \| GENL_DONT_VALIDATE_DUMP,
9504b3ee	448	.flags = 0,
9504b3ee JB	449	.doit = hsr_get_node_list,
	450	.dumpit = NULL,
	451	},
f421436a AB	452	};
f421436a AB	453
56989f6d	454	static struct genl_family hsr_genl_family __ro_after_init = {
489111e5 JB	455	.hdrsize = 0,
	456	.name = "HSR",
	457	.version = 1,
	458	.maxattr = HSR_A_MAX,
3b0f31f2	459	.policy = hsr_genl_policy,
489111e5 JB	460	.module = THIS_MODULE,
	461	.ops = hsr_ops,
	462	.n_ops = ARRAY_SIZE(hsr_ops),
	463	.mcgrps = hsr_mcgrps,
	464	.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
	465	};
	466
f421436a AB	467	int __init hsr_netlink_init(void)
	468	{
	469	int rc;
	470
	471	rc = rtnl_link_register(&hsr_link_ops);
	472	if (rc)
	473	goto fail_rtnl_link_register;
	474
489111e5	475	rc = genl_register_family(&hsr_genl_family);
f421436a AB	476	if (rc)
	477	goto fail_genl_register_family;
	478
f421436a AB	479	return 0;
f421436a AB	480
f421436a AB	481	fail_genl_register_family:
	482	rtnl_link_unregister(&hsr_link_ops);
	483	fail_rtnl_link_register:
	484
	485	return rc;
	486	}
	487
	488	void __exit hsr_netlink_exit(void)
	489	{
f421436a	490	genl_unregister_family(&hsr_genl_family);
f421436a AB	491	rtnl_link_unregister(&hsr_link_ops);
	492	}
	493
	494	MODULE_ALIAS_RTNL_LINK("hsr");