path: root/drivers/net/bonding/bond_netlink.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * drivers/net/bond/bond_netlink.c - Netlink interface for bonding
 * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us>
 * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com>
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if_link.h>
#include <linux/if_ether.h>
#include <net/netlink.h>
#include <net/rtnetlink.h>
#include <net/bonding.h>
#include <net/ipv6.h>

static size_t bond_get_slave_size(const struct net_device *bond_dev,
				  const struct net_device *slave_dev)
{
	return nla_total_size(sizeof(u8)) +	/* IFLA_BOND_SLAVE_STATE */
		nla_total_size(sizeof(u8)) +	/* IFLA_BOND_SLAVE_MII_STATUS */
		nla_total_size(sizeof(u32)) +	/* IFLA_BOND_SLAVE_LINK_FAILURE_COUNT */
		nla_total_size(MAX_ADDR_LEN) +	/* IFLA_BOND_SLAVE_PERM_HWADDR */
		nla_total_size(sizeof(u16)) +	/* IFLA_BOND_SLAVE_QUEUE_ID */
		nla_total_size(sizeof(u16)) +	/* IFLA_BOND_SLAVE_AD_AGGREGATOR_ID */
		nla_total_size(sizeof(u8)) +	/* IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE */
		nla_total_size(sizeof(u16)) +	/* IFLA_BOND_SLAVE_AD_PARTNER_OPER_PORT_STATE */
		nla_total_size(sizeof(s32)) +	/* IFLA_BOND_SLAVE_PRIO */
		nla_total_size(sizeof(u16)) +	/* IFLA_BOND_SLAVE_ACTOR_PORT_PRIO */
		nla_total_size(sizeof(u8)) +	/* IFLA_BOND_SLAVE_AD_CHURN_ACTOR_STATE */
		nla_total_size(sizeof(u8)) +	/* IFLA_BOND_SLAVE_AD_CHURN_PARTNER_STATE */
		0;
}

static int bond_fill_slave_info(struct sk_buff *skb,
				const struct net_device *bond_dev,
				const struct net_device *slave_dev)
{
	struct slave *slave = bond_slave_get_rtnl(slave_dev);

	if (nla_put_u8(skb, IFLA_BOND_SLAVE_STATE, bond_slave_state(slave)))
		goto nla_put_failure;

	if (nla_put_u8(skb, IFLA_BOND_SLAVE_MII_STATUS, slave->link))
		goto nla_put_failure;

	if (nla_put_u32(skb, IFLA_BOND_SLAVE_LINK_FAILURE_COUNT,
			slave->link_failure_count))
		goto nla_put_failure;

	if (nla_put(skb, IFLA_BOND_SLAVE_PERM_HWADDR,
		    slave_dev->addr_len, slave->perm_hwaddr))
		goto nla_put_failure;

	if (nla_put_u16(skb, IFLA_BOND_SLAVE_QUEUE_ID,
			READ_ONCE(slave->queue_id)))
		goto nla_put_failure;

	if (nla_put_s32(skb, IFLA_BOND_SLAVE_PRIO, slave->prio))
		goto nla_put_failure;

	if (BOND_MODE(slave->bond) == BOND_MODE_8023AD) {
		const struct aggregator *agg;
		const struct port *ad_port;

		ad_port = &SLAVE_AD_INFO(slave)->port;
		rcu_read_lock();
		agg = rcu_dereference(SLAVE_AD_INFO(slave)->port.aggregator);
		if (agg) {
			if (nla_put_u16(skb, IFLA_BOND_SLAVE_AD_AGGREGATOR_ID,
					agg->aggregator_identifier))
				goto nla_put_failure_rcu;
			if (nla_put_u8(skb,
				       IFLA_BOND_SLAVE_AD_ACTOR_OPER_PORT_STATE,
				       ad_port->actor_oper_port_state))
				goto nla_put_failure_rcu;
			if (nla_put_u16(skb,
					IFLA_BOND_SLAVE_AD_PARTNER_OPER_PORT_STATE,
					ad_port->partner_oper.port_state))
				goto nla_put_failure_rcu;

			if (nla_put_u8(skb, IFLA_BOND_SLAVE_AD_CHURN_ACTOR_STATE,
				       READ_ONCE(ad_port->sm_churn_actor_state)))
				goto nla_put_failure_rcu;
			if (nla_put_u8(skb, IFLA_BOND_SLAVE_AD_CHURN_PARTNER_STATE,
				       READ_ONCE(ad_port->sm_churn_partner_state)))
				goto nla_put_failure_rcu;
		}
		rcu_read_unlock();

		if (nla_put_u16(skb, IFLA_BOND_SLAVE_ACTOR_PORT_PRIO,
				SLAVE_AD_INFO(slave)->port_priority))
			goto nla_put_failure;
	}

	return 0;

nla_put_failure_rcu:
	rcu_read_unlock();
nla_put_failure:
	return -EMSGSIZE;
}

/* Limit the max delay range to 300s */
static const struct netlink_range_validation delay_range = {
	.max = 300000,
};

static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = {
	[IFLA_BOND_MODE]		= { .type = NLA_U8 },
	[IFLA_BOND_ACTIVE_SLAVE]	= { .type = NLA_U32 },
	[IFLA_BOND_MIIMON]		= { .type = NLA_U32 },
	[IFLA_BOND_UPDELAY]		= { .type = NLA_U32 },
	[IFLA_BOND_DOWNDELAY]		= { .type = NLA_U32 },
	[IFLA_BOND_USE_CARRIER]		= { .type = NLA_U8 },
	[IFLA_BOND_ARP_INTERVAL]	= { .type = NLA_U32 },
	[IFLA_BOND_ARP_IP_TARGET]	= { .type = NLA_NESTED },
	[IFLA_BOND_ARP_VALIDATE]	= { .