[linux-block.git] / net / bridge / br_sysfs_if.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Sysfs attributes of bridge ports
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Stephen Hemminger		<shemminger@osdl.org>
 */

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_bridge.h>
#include <linux/rtnetlink.h>
#include <linux/spinlock.h>
#include <linux/sched/signal.h>

#include "br_private.h"

/* IMPORTANT: new bridge port options must be added with netlink support only
 *            please do not add new sysfs entries
 */

struct brport_attribute {
	struct attribute	attr;
	ssize_t (*show)(struct net_bridge_port *, char *);
	int (*store)(struct net_bridge_port *, unsigned long);
	int (*store_raw)(struct net_bridge_port *, char *);
};

#define BRPORT_ATTR_RAW(_name, _mode, _show, _store)			\
const struct brport_attribute brport_attr_##_name = {			\
	.attr		= {.name = __stringify(_name),			\
			   .mode = _mode },				\
	.show		= _show,					\
	.store_raw	= _store,					\
};

#define BRPORT_ATTR(_name, _mode, _show, _store)		\
const struct brport_attribute brport_attr_##_name = { 	        \
	.attr = {.name = __stringify(_name), 			\
		 .mode = _mode },				\
	.show	= _show,					\
	.store	= _store,					\
};

#define BRPORT_ATTR_FLAG(_name, _mask)				\
static ssize_t show_##_name(struct net_bridge_port *p, char *buf) \
{								\
	return sprintf(buf, "%d\n", !!(p->flags & _mask));	\
}								\
static int store_##_name(struct net_bridge_port *p, unsigned long v) \
{								\
	return store_flag(p, v, _mask);				\
}								\
static BRPORT_ATTR(_name, 0644,					\
		   show_##_name, store_##_name)

static int store_flag(struct net_bridge_port *p, unsigned long v,
		      unsigned long mask)
{
	struct netlink_ext_ack extack = {0};
	unsigned long flags = p->flags;
	int err;

	if (v)
		flags |= mask;
	else
		flags &= ~mask;

	if (flags != p->flags) {
		err = br_switchdev_set_port_flag(p, flags, mask, &extack);
		if (err) {
			netdev_err(p->dev, "%s\n", extack._msg);
			return err;
		}

		p->flags = flags;
		br_port_flags_change(p, mask);
	}
	return 0;
}

static ssize_t show_path_cost(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->path_cost);
}

static BRPORT_ATTR(path_cost, 0644,
		   show_path_cost, br_stp_set_path_cost);

static ssize_t show_priority(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->priority);
}

static BRPORT_ATTR(priority, 0644,
			 show_priority, br_stp_set_port_priority);

static ssize_t show_designated_root(struct net_bridge_port *p, char *buf)
{
	return br_show_bridge_id(buf, &p->designated_root);
}
static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL);

static ssize_t show_designated_bridge(struct net_bridge_port *p, char *buf)
{
	return br_show_bridge_id(buf, &p->designated_bridge);
}
static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL);

static ssize_t show_designated_port(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->designated_port);
}
static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL);

static ssize_t show_designated_cost(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->designated_cost);
}
static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL);

static ssize_t show_port_id(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "0x%x\n", p->port_id);
}
static BRPORT_ATTR(port_id, 0444, show_port_id, NULL);

static ssize_t show_port_no(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "0x%x\n", p->port_no);
}

static BRPORT_ATTR(port_no, 0444, show_port_no, NULL);

static ssize_t show_change_ack(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->topology_change_ack);
}
static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL);

static ssize_t show_config_pending(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->config_pending);
}
static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL);

static ssize_t show_port_state(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->state);
}
static BRPORT_ATTR(state, 0444, show_port_state, NULL);

static ssize_t show_message_age_timer(struct net_bridge_port *p,
					    char *buf)
{
	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
}
static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL);

static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
					    char *buf)
{
	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
}
static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL);

static ssize_t show_hold_timer(struct net_bridge_port *p,
					    char *buf)
{
	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
}
static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL);

static int store_flush(struct net_bridge_port *p, unsigned long v)
{
	br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
	return 0;
}
static BRPORT_ATTR(flush, 0200, NULL, store_flush);

static ssize_t show_group_fwd_mask(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%#x\n", p->group_fwd_mask);
}

static int store_group_fwd_mask(struct net_bridge_port *p,
				unsigned long v)
{
	if (v & BR_GROUPFWD_MACPAUSE)
		return -EINVAL;
	p->group_fwd_mask = v;

	return 0;
}
static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
		   store_group_fwd_mask);

static ssize_t show_backup_port(struct net_bridge_port *p, char *buf)
{
	struct net_bridge_port *backup_p;
	int ret = 0;

	rcu_read_lock();
	backup_p = rcu_dereference(p->backup_port);
	if (backup_p)
		ret = sprintf(buf, "%s\n", backup_p->dev->name);
	rcu_read_unlock();

	return ret;
}

static int store_backup_port(struct net_bridge_port *p, char *buf)
{
	struct net_device *backup_dev = NULL;
	char *nl = strchr(buf, '\n');

	if (nl)
		*nl = '\0';

	if (strlen(buf) > 0) {
		backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
		if (!backup_dev)
			return -ENOENT;
	}

	return nbp_backup_change(p, backup_dev);
}
static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);

BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
BRPORT_ATTR_FLAG(learning, BR_LEARNING);
BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);

#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
static ssize_t show_multicast_router(struct net_bridge_port *p, char *buf)
{
	return sprintf(buf, "%d\n", p->multicast_ctx.multicast_router);
}

static int store_multicast_router(struct net_bridge_port *p,
				      unsigned long v)
{
	return br_multicast_set_port_router(&p->multicast_ctx, v);
}
static BRPORT_ATTR(multicast_router, 0644, show_multicast_router,
		   store_multicast_router);

BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
#endif

static const struct brport_attribute *brport_attrs[] = {
	&brport_attr_path_cost,
	&brport_attr_priority,
	&brport_attr_port_id,
	&brport_attr_port_no,
	&brport_attr_designated_root,
	&brport_attr_designated_bridge,
	&brport_attr_designated_port,
	&brport_attr_designated_cost,
	&brport_attr_state,
	&brport_attr_change_ack,
	&brport_attr_config_pending,
	&brport_attr_message_age_timer,
	&brport_attr_forward_delay_timer,
	&brport_attr_hold_timer,
	&brport_attr_flush,
	&brport_attr_hairpin_mode,
	&brport_attr_bpdu_guard,
	&brport_attr_root_block,
	&brport_attr_learning,
	&brport_attr_unicast_flood,
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	&brport_attr_multicast_router,
	&brport_attr_multicast_fast_leave,
	&brport_attr_multicast_to_unicast,
#endif
	&brport_attr_proxyarp,
	&brport_attr_proxyarp_wifi,
	&brport_attr_multicast_flood,
	&brport_attr_broadcast_flood,
	&brport_attr_group_fwd_mask,
	&brport_attr_neigh_suppress,
	&brport_attr_isolated,
	&brport_attr_backup_port,
	NULL
};

#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)

static ssize_t brport_show(struct kobject *kobj,
			   struct attribute *attr, char *buf)
{
	struct brport_attribute *brport_attr = to_brport_attr(attr);
	struct net_bridge_port *p = kobj_to_brport(kobj);

	if (!brport_attr->show)
		return -EINVAL;

	return brport_attr->show(p, buf);
}

static ssize_t brport_store(struct kobject *kobj,
			    struct attribute *attr,
			    const char *buf, size_t count)
{
	struct brport_attribute *brport_attr = to_brport_attr(attr);
	struct net_bridge_port *p = kobj_to_brport(kobj);
	ssize_t ret = -EINVAL;
	unsigned long val;
	char *endp;

	if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
		return -EPERM;

	if (!rtnl_trylock())
		return restart_syscall();

	if (brport_attr->store_raw) {
		char *buf_copy;

		buf_copy = kstrndup(buf, count, GFP_KERNEL);
		if (!buf_copy) {
			ret = -ENOMEM;
			goto out_unlock;
		}
		spin_lock_bh(&p->br->lock);
		ret = brport_attr->store_raw(p, buf_copy);
		spin_unlock_bh(&p->br->lock);
		kfree(buf_copy);
	} else if (brport_attr->store) {
		val = simple_strtoul(buf, &endp, 0);
		if (endp == buf)
			goto out_unlock;
		spin_lock_bh(&p->br->lock);
		ret = brport_attr->store(p, val);
		spin_unlock_bh(&p->br->lock);
	}

	if (!ret) {
		br_ifinfo_notify(RTM_NEWLINK, NULL, p);
		ret = count;
	}
out_unlock:
	rtnl_unlock();

	return ret;
}

const struct sysfs_ops brport_sysfs_ops = {
	.show = brport_show,
	.store = brport_store,
};

/*
 * Add sysfs entries to ethernet device added to a bridge.
 * Creates a brport subdirectory with bridge attributes.
 * Puts symlink in bridge's brif subdirectory
 */
int br_sysfs_addif(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	const struct brport_attribute **a;
	int err;

	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
				SYSFS_BRIDGE_PORT_LINK);
	if (err)
		return err;

	for (a = brport_attrs; *a; ++a) {
		err = sysfs_create_file(&p->kobj, &((*a)->attr));
		if (err)
			return err;
	}

	strscpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
}

/* Rename bridge's brif symlink */
int br_sysfs_renameif(struct net_bridge_port *p)
{
	struct net_bridge *br = p->br;
	int err;

	/* If a rename fails, the rollback will cause another
	 * rename call with the existing name.
	 */
	if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
		return 0;

	err = sysfs_rename_link(br->ifobj, &p->kobj,
				p->sysfs_name, p->dev->name);
	if (err)
		netdev_notice(br->dev, "unable to rename link %s to %s",
			      p->sysfs_name, p->dev->name);
	else
		strscpy(p->sysfs_name, p->dev->name, IFNAMSIZ);

	return err;
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-or-later
	2	/*
	3	* Sysfs attributes of bridge ports
	4	* Linux ethernet bridge
	5	*
	6	* Authors:
	7	* Stephen Hemminger <shemminger@osdl.org>
	8	*/
	9
	10	#include <linux/capability.h>
	11	#include <linux/kernel.h>
	12	#include <linux/netdevice.h>
	13	#include <linux/if_bridge.h>
	14	#include <linux/rtnetlink.h>
	15	#include <linux/spinlock.h>
	16	#include <linux/sched/signal.h>
	17
	18	#include "br_private.h"
	19
	20	/* IMPORTANT: new bridge port options must be added with netlink support only
	21	* please do not add new sysfs entries
	22	*/
	23
	24	struct brport_attribute {
	25	struct attribute attr;
	26	ssize_t (show)(struct net_bridge_port , char *);
	27	int (store)(struct net_bridge_port , unsigned long);
	28	int (store_raw)(struct net_bridge_port , char *);
	29	};
	30
	31	#define BRPORT_ATTR_RAW(_name, _mode, _show, _store) \
	32	const struct brport_attribute brport_attr_##_name = { \
	33	.attr = {.name = __stringify(_name), \
	34	.mode = _mode }, \
	35	.show = _show, \
	36	.store_raw = _store, \
	37	};
	38
	39	#define BRPORT_ATTR(_name, _mode, _show, _store) \
	40	const struct brport_attribute brport_attr_##_name = { \
	41	.attr = {.name = __stringify(_name), \
	42	.mode = _mode }, \
	43	.show = _show, \
	44	.store = _store, \
	45	};
	46
	47	#define BRPORT_ATTR_FLAG(_name, _mask) \
	48	static ssize_t show_##_name(struct net_bridge_port p, char buf) \
	49	{ \
	50	return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
	51	} \
	52	static int store_##_name(struct net_bridge_port *p, unsigned long v) \
	53	{ \
	54	return store_flag(p, v, _mask); \
	55	} \
	56	static BRPORT_ATTR(_name, 0644, \
	57	show_##_name, store_##_name)
	58
	59	static int store_flag(struct net_bridge_port *p, unsigned long v,
	60	unsigned long mask)
	61	{
	62	struct netlink_ext_ack extack = {0};
	63	unsigned long flags = p->flags;
	64	int err;
	65
	66	if (v)
	67	flags \|= mask;
	68	else
	69	flags &= ~mask;
	70
	71	if (flags != p->flags) {
	72	err = br_switchdev_set_port_flag(p, flags, mask, &extack);
	73	if (err) {
	74	netdev_err(p->dev, "%s\n", extack._msg);
	75	return err;
	76	}
	77
	78	p->flags = flags;
	79	br_port_flags_change(p, mask);
	80	}
	81	return 0;
	82	}
	83
	84	static ssize_t show_path_cost(struct net_bridge_port p, char buf)
	85	{
	86	return sprintf(buf, "%d\n", p->path_cost);
	87	}
	88
	89	static BRPORT_ATTR(path_cost, 0644,
	90	show_path_cost, br_stp_set_path_cost);
	91
	92	static ssize_t show_priority(struct net_bridge_port p, char buf)
	93	{
	94	return sprintf(buf, "%d\n", p->priority);
	95	}
	96
	97	static BRPORT_ATTR(priority, 0644,
	98	show_priority, br_stp_set_port_priority);
	99
	100	static ssize_t show_designated_root(struct net_bridge_port p, char buf)
	101	{
	102	return br_show_bridge_id(buf, &p->designated_root);
	103	}
	104	static BRPORT_ATTR(designated_root, 0444, show_designated_root, NULL);
	105
	106	static ssize_t show_designated_bridge(struct net_bridge_port p, char buf)
	107	{
	108	return br_show_bridge_id(buf, &p->designated_bridge);
	109	}
	110	static BRPORT_ATTR(designated_bridge, 0444, show_designated_bridge, NULL);
	111
	112	static ssize_t show_designated_port(struct net_bridge_port p, char buf)
	113	{
	114	return sprintf(buf, "%d\n", p->designated_port);
	115	}
	116	static BRPORT_ATTR(designated_port, 0444, show_designated_port, NULL);
	117
	118	static ssize_t show_designated_cost(struct net_bridge_port p, char buf)
	119	{
	120	return sprintf(buf, "%d\n", p->designated_cost);
	121	}
	122	static BRPORT_ATTR(designated_cost, 0444, show_designated_cost, NULL);
	123
	124	static ssize_t show_port_id(struct net_bridge_port p, char buf)
	125	{
	126	return sprintf(buf, "0x%x\n", p->port_id);
	127	}
	128	static BRPORT_ATTR(port_id, 0444, show_port_id, NULL);
	129
	130	static ssize_t show_port_no(struct net_bridge_port p, char buf)
	131	{
	132	return sprintf(buf, "0x%x\n", p->port_no);
	133	}
	134
	135	static BRPORT_ATTR(port_no, 0444, show_port_no, NULL);
	136
	137	static ssize_t show_change_ack(struct net_bridge_port p, char buf)
	138	{
	139	return sprintf(buf, "%d\n", p->topology_change_ack);
	140	}
	141	static BRPORT_ATTR(change_ack, 0444, show_change_ack, NULL);
	142
	143	static ssize_t show_config_pending(struct net_bridge_port p, char buf)
	144	{
	145	return sprintf(buf, "%d\n", p->config_pending);
	146	}
	147	static BRPORT_ATTR(config_pending, 0444, show_config_pending, NULL);
	148
	149	static ssize_t show_port_state(struct net_bridge_port p, char buf)
	150	{
	151	return sprintf(buf, "%d\n", p->state);
	152	}
	153	static BRPORT_ATTR(state, 0444, show_port_state, NULL);
	154
	155	static ssize_t show_message_age_timer(struct net_bridge_port *p,
	156	char *buf)
	157	{
	158	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
	159	}
	160	static BRPORT_ATTR(message_age_timer, 0444, show_message_age_timer, NULL);
	161
	162	static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
	163	char *buf)
	164	{
	165	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
	166	}
	167	static BRPORT_ATTR(forward_delay_timer, 0444, show_forward_delay_timer, NULL);
	168
	169	static ssize_t show_hold_timer(struct net_bridge_port *p,
	170	char *buf)
	171	{
	172	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
	173	}
	174	static BRPORT_ATTR(hold_timer, 0444, show_hold_timer, NULL);
	175
	176	static int store_flush(struct net_bridge_port *p, unsigned long v)
	177	{
	178	br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
	179	return 0;
	180	}
	181	static BRPORT_ATTR(flush, 0200, NULL, store_flush);
	182
	183	static ssize_t show_group_fwd_mask(struct net_bridge_port p, char buf)
	184	{
	185	return sprintf(buf, "%#x\n", p->group_fwd_mask);
	186	}
	187
	188	static int store_group_fwd_mask(struct net_bridge_port *p,
	189	unsigned long v)
	190	{
	191	if (v & BR_GROUPFWD_MACPAUSE)
	192	return -EINVAL;
	193	p->group_fwd_mask = v;
	194
	195	return 0;
	196	}
	197	static BRPORT_ATTR(group_fwd_mask, 0644, show_group_fwd_mask,
	198	store_group_fwd_mask);
	199
	200	static ssize_t show_backup_port(struct net_bridge_port p, char buf)
	201	{
	202	struct net_bridge_port *backup_p;
	203	int ret = 0;
	204
	205	rcu_read_lock();
	206	backup_p = rcu_dereference(p->backup_port);
	207	if (backup_p)
	208	ret = sprintf(buf, "%s\n", backup_p->dev->name);
	209	rcu_read_unlock();
	210
	211	return ret;
	212	}
	213
	214	static int store_backup_port(struct net_bridge_port p, char buf)
	215	{
	216	struct net_device *backup_dev = NULL;
	217	char *nl = strchr(buf, '\n');
	218
	219	if (nl)
	220	*nl = '\0';
	221
	222	if (strlen(buf) > 0) {
	223	backup_dev = __dev_get_by_name(dev_net(p->dev), buf);
	224	if (!backup_dev)
	225	return -ENOENT;
	226	}
	227
	228	return nbp_backup_change(p, backup_dev);
	229	}
	230	static BRPORT_ATTR_RAW(backup_port, 0644, show_backup_port, store_backup_port);
	231
	232	BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
	233	BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
	234	BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
	235	BRPORT_ATTR_FLAG(learning, BR_LEARNING);
	236	BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
	237	BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
	238	BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
	239	BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
	240	BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
	241	BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
	242	BRPORT_ATTR_FLAG(isolated, BR_ISOLATED);
	243
	244	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	245	static ssize_t show_multicast_router(struct net_bridge_port p, char buf)
	246	{
	247	return sprintf(buf, "%d\n", p->multicast_ctx.multicast_router);
	248	}
	249
	250	static int store_multicast_router(struct net_bridge_port *p,
	251	unsigned long v)
	252	{
	253	return br_multicast_set_port_router(&p->multicast_ctx, v);
	254	}
	255	static BRPORT_ATTR(multicast_router, 0644, show_multicast_router,
	256	store_multicast_router);
	257
	258	BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
	259	BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
	260	#endif
	261
	262	static const struct brport_attribute *brport_attrs[] = {
	263	&brport_attr_path_cost,
	264	&brport_attr_priority,
	265	&brport_attr_port_id,
	266	&brport_attr_port_no,
	267	&brport_attr_designated_root,
	268	&brport_attr_designated_bridge,
	269	&brport_attr_designated_port,
	270	&brport_attr_designated_cost,
	271	&brport_attr_state,
	272	&brport_attr_change_ack,
	273	&brport_attr_config_pending,
	274	&brport_attr_message_age_timer,
	275	&brport_attr_forward_delay_timer,
	276	&brport_attr_hold_timer,
	277	&brport_attr_flush,
	278	&brport_attr_hairpin_mode,
	279	&brport_attr_bpdu_guard,
	280	&brport_attr_root_block,
	281	&brport_attr_learning,
	282	&brport_attr_unicast_flood,
	283	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	284	&brport_attr_multicast_router,
	285	&brport_attr_multicast_fast_leave,
	286	&brport_attr_multicast_to_unicast,
	287	#endif
	288	&brport_attr_proxyarp,
	289	&brport_attr_proxyarp_wifi,
	290	&brport_attr_multicast_flood,
	291	&brport_attr_broadcast_flood,
	292	&brport_attr_group_fwd_mask,
	293	&brport_attr_neigh_suppress,
	294	&brport_attr_isolated,
	295	&brport_attr_backup_port,
	296	NULL
	297	};
	298
	299	#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
	300
	301	static ssize_t brport_show(struct kobject *kobj,
	302	struct attribute attr, char buf)
	303	{
	304	struct brport_attribute *brport_attr = to_brport_attr(attr);
	305	struct net_bridge_port *p = kobj_to_brport(kobj);
	306
	307	if (!brport_attr->show)
	308	return -EINVAL;
	309
	310	return brport_attr->show(p, buf);
	311	}
	312
	313	static ssize_t brport_store(struct kobject *kobj,
	314	struct attribute *attr,
	315	const char *buf, size_t count)
	316	{
	317	struct brport_attribute *brport_attr = to_brport_attr(attr);
	318	struct net_bridge_port *p = kobj_to_brport(kobj);
	319	ssize_t ret = -EINVAL;
	320	unsigned long val;
	321	char *endp;
	322
	323	if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
	324	return -EPERM;
	325
	326	if (!rtnl_trylock())
	327	return restart_syscall();
	328
	329	if (brport_attr->store_raw) {
	330	char *buf_copy;
	331
	332	buf_copy = kstrndup(buf, count, GFP_KERNEL);
	333	if (!buf_copy) {
	334	ret = -ENOMEM;
	335	goto out_unlock;
	336	}
	337	spin_lock_bh(&p->br->lock);
	338	ret = brport_attr->store_raw(p, buf_copy);
	339	spin_unlock_bh(&p->br->lock);
	340	kfree(buf_copy);
	341	} else if (brport_attr->store) {
	342	val = simple_strtoul(buf, &endp, 0);
	343	if (endp == buf)
	344	goto out_unlock;
	345	spin_lock_bh(&p->br->lock);
	346	ret = brport_attr->store(p, val);
	347	spin_unlock_bh(&p->br->lock);
	348	}
	349
	350	if (!ret) {
	351	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
	352	ret = count;
	353	}
	354	out_unlock:
	355	rtnl_unlock();
	356
	357	return ret;
	358	}
	359
	360	const struct sysfs_ops brport_sysfs_ops = {
	361	.show = brport_show,
	362	.store = brport_store,
	363	};
	364
	365	/*
	366	* Add sysfs entries to ethernet device added to a bridge.
	367	* Creates a brport subdirectory with bridge attributes.
	368	* Puts symlink in bridge's brif subdirectory
	369	*/
	370	int br_sysfs_addif(struct net_bridge_port *p)
	371	{
	372	struct net_bridge *br = p->br;
	373	const struct brport_attribute **a;
	374	int err;
	375
	376	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
	377	SYSFS_BRIDGE_PORT_LINK);
	378	if (err)
	379	return err;
	380
	381	for (a = brport_attrs; *a; ++a) {
	382	err = sysfs_create_file(&p->kobj, &((*a)->attr));
	383	if (err)
	384	return err;
	385	}
	386
	387	strscpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	388	return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
	389	}
	390
	391	/* Rename bridge's brif symlink */
	392	int br_sysfs_renameif(struct net_bridge_port *p)
	393	{
	394	struct net_bridge *br = p->br;
	395	int err;
	396
	397	/* If a rename fails, the rollback will cause another
	398	* rename call with the existing name.
	399	*/
	400	if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
	401	return 0;
	402
	403	err = sysfs_rename_link(br->ifobj, &p->kobj,
	404	p->sysfs_name, p->dev->name);
	405	if (err)
	406	netdev_notice(br->dev, "unable to rename link %s to %s",
	407	p->sysfs_name, p->dev->name);
	408	else
	409	strscpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	410
	411	return err;
	412	}