[mirror_ubuntu-bionic-kernel.git] / net / bridge / br_sysfs_if.c

/*
 *	Sysfs attributes of bridge ports
 *	Linux ethernet bridge
 *
 *	Authors:
 *	Stephen Hemminger		<shemminger@osdl.org>
 *
 *	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.
 */

#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"

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

#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, S_IRUGO | S_IWUSR,			\
		   show_##_name, store_##_name)

static int store_flag(struct net_bridge_port *p, unsigned long v,
		      unsigned long mask)
{
	unsigned long flags;

	flags = p->flags;

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

	if (flags != p->flags) {
		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, S_IRUGO | S_IWUSR,
		   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, S_IRUGO | S_IWUSR,
			 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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, S_IWUSR, 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, S_IRUGO | S_IWUSR, show_group_fwd_mask,
		   store_group_fwd_mask);

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);

#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_router);
}

static int store_multicast_router(struct net_bridge_port *p,
				      unsigned long v)
{
	return br_multicast_set_port_router(p, v);
}
static BRPORT_ATTR(multicast_router, S_IRUGO | S_IWUSR, 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,
	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;
	char *endp;
	unsigned long val;

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

	val = simple_strtoul(buf, &endp, 0);
	if (endp != buf) {
		if (!rtnl_trylock())
			return restart_syscall();
		if (p->dev && p->br && brport_attr->store) {
			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;
			}
		}
		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;
	}

	strlcpy(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
		strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);

	return err;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Sysfs attributes of bridge ports
	3	* Linux ethernet bridge
	4	*
	5	* Authors:
	6	* Stephen Hemminger <shemminger@osdl.org>
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*/
	13
4fc268d2	14	#include <linux/capability.h>
1da177e4 LT	15	#include <linux/kernel.h>
	16	#include <linux/netdevice.h>
	17	#include <linux/if_bridge.h>
	18	#include <linux/rtnetlink.h>
	19	#include <linux/spinlock.h>
174cd4b1	20	#include <linux/sched/signal.h>
1da177e4 LT	21
	22	#include "br_private.h"
	23
	24	struct brport_attribute {
	25	struct attribute attr;
	26	ssize_t (show)(struct net_bridge_port , char *);
14f98f25	27	int (store)(struct net_bridge_port , unsigned long);
1da177e4 LT	28	};
1da177e4 LT	29
31a5b837	30	#define BRPORT_ATTR(_name, _mode, _show, _store) \
5a0d513b	31	const struct brport_attribute brport_attr_##_name = { \
1da177e4	32	.attr = {.name = __stringify(_name), \
7b595756	33	.mode = _mode }, \
1da177e4 LT	34	.show = _show, \
	35	.store = _store, \
	36	};
	37
cd753732	38	#define BRPORT_ATTR_FLAG(_name, _mask) \
	39	static ssize_t show_##_name(struct net_bridge_port p, char buf) \
	40	{ \
	41	return sprintf(buf, "%d\n", !!(p->flags & _mask)); \
	42	} \
	43	static int store_##_name(struct net_bridge_port *p, unsigned long v) \
	44	{ \
63c3a622	45	return store_flag(p, v, _mask); \
cd753732	46	} \
	47	static BRPORT_ATTR(_name, S_IRUGO \| S_IWUSR, \
	48	show_##_name, store_##_name)
	49
63c3a622 VY	50	static int store_flag(struct net_bridge_port *p, unsigned long v,
	51	unsigned long mask)
	52	{
e028e4b8 VY	53	unsigned long flags;
	54
	55	flags = p->flags;
63c3a622 VY	56
	57	if (v)
	58	flags \|= mask;
	59	else
	60	flags &= ~mask;
	61
	62	if (flags != p->flags) {
	63	p->flags = flags;
e028e4b8	64	br_port_flags_change(p, mask);
63c3a622 VY	65	}
	66	return 0;
	67	}
cd753732	68
1da177e4 LT	69	static ssize_t show_path_cost(struct net_bridge_port p, char buf)
	70	{
	71	return sprintf(buf, "%d\n", p->path_cost);
	72	}
14f98f25	73
1da177e4	74	static BRPORT_ATTR(path_cost, S_IRUGO \| S_IWUSR,
14f98f25	75	show_path_cost, br_stp_set_path_cost);
1da177e4 LT	76
	77	static ssize_t show_priority(struct net_bridge_port p, char buf)
	78	{
	79	return sprintf(buf, "%d\n", p->priority);
	80	}
14f98f25	81
1da177e4	82	static BRPORT_ATTR(priority, S_IRUGO \| S_IWUSR,
14f98f25	83	show_priority, br_stp_set_port_priority);
1da177e4 LT	84
	85	static ssize_t show_designated_root(struct net_bridge_port p, char buf)
	86	{
	87	return br_show_bridge_id(buf, &p->designated_root);
	88	}
	89	static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
	90
	91	static ssize_t show_designated_bridge(struct net_bridge_port p, char buf)
	92	{
	93	return br_show_bridge_id(buf, &p->designated_bridge);
	94	}
	95	static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
	96
	97	static ssize_t show_designated_port(struct net_bridge_port p, char buf)
	98	{
	99	return sprintf(buf, "%d\n", p->designated_port);
	100	}
	101	static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
	102
	103	static ssize_t show_designated_cost(struct net_bridge_port p, char buf)
	104	{
	105	return sprintf(buf, "%d\n", p->designated_cost);
	106	}
	107	static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
	108
	109	static ssize_t show_port_id(struct net_bridge_port p, char buf)
	110	{
	111	return sprintf(buf, "0x%x\n", p->port_id);
	112	}
	113	static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
	114
	115	static ssize_t show_port_no(struct net_bridge_port p, char buf)
	116	{
	117	return sprintf(buf, "0x%x\n", p->port_no);
	118	}
	119
	120	static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
	121
	122	static ssize_t show_change_ack(struct net_bridge_port p, char buf)
	123	{
	124	return sprintf(buf, "%d\n", p->topology_change_ack);
	125	}
	126	static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
	127
	128	static ssize_t show_config_pending(struct net_bridge_port p, char buf)
	129	{
	130	return sprintf(buf, "%d\n", p->config_pending);
	131	}
	132	static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
	133
	134	static ssize_t show_port_state(struct net_bridge_port p, char buf)
	135	{
	136	return sprintf(buf, "%d\n", p->state);
	137	}
	138	static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
	139
	140	static ssize_t show_message_age_timer(struct net_bridge_port *p,
	141	char *buf)
	142	{
	143	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
	144	}
	145	static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
	146
	147	static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
148	char *buf)
149	{
150	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
151	}
152	static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
153
154	static ssize_t show_hold_timer(struct net_bridge_port *p,
155	char *buf)
156	{
157	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
158	}
159	static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
160
14f98f25	161	static int store_flush(struct net_bridge_port *p, unsigned long v)
9cf63747	162	{
1ea2d020	163	br_fdb_delete_by_port(p->br, p, 0, 0); // Don't delete local entry
9cf63747 SH	164	return 0;
	165	}
	166	static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
	167
5af48b59 NA	168	static ssize_t show_group_fwd_mask(struct net_bridge_port p, char buf)
	169	{
	170	return sprintf(buf, "%#x\n", p->group_fwd_mask);
	171	}
	172
	173	static int store_group_fwd_mask(struct net_bridge_port *p,
	174	unsigned long v)
	175	{
	176	if (v & BR_GROUPFWD_MACPAUSE)
	177	return -EINVAL;
	178	p->group_fwd_mask = v;
	179
	180	return 0;
	181	}
	182	static BRPORT_ATTR(group_fwd_mask, S_IRUGO \| S_IWUSR, show_group_fwd_mask,
	183	store_group_fwd_mask);
	184
cd753732	185	BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
a2e01a65	186	BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
1007dd1a	187	BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);
9ba18891	188	BRPORT_ATTR_FLAG(learning, BR_LEARNING);
867a5943	189	BRPORT_ATTR_FLAG(unicast_flood, BR_FLOOD);
95850116	190	BRPORT_ATTR_FLAG(proxyarp, BR_PROXYARP);
842a9ae0	191	BRPORT_ATTR_FLAG(proxyarp_wifi, BR_PROXYARP_WIFI);
b6cb5ac8	192	BRPORT_ATTR_FLAG(multicast_flood, BR_MCAST_FLOOD);
99f906e9	193	BRPORT_ATTR_FLAG(broadcast_flood, BR_BCAST_FLOOD);
821f1b21	194	BRPORT_ATTR_FLAG(neigh_suppress, BR_NEIGH_SUPPRESS);
3982d3d2	195
0909e117 HX	196	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	197	static ssize_t show_multicast_router(struct net_bridge_port p, char buf)
	198	{
	199	return sprintf(buf, "%d\n", p->multicast_router);
	200	}
	201
14f98f25	202	static int store_multicast_router(struct net_bridge_port *p,
0909e117 HX	203	unsigned long v)
	204	{
	205	return br_multicast_set_port_router(p, v);
	206	}
	207	static BRPORT_ATTR(multicast_router, S_IRUGO \| S_IWUSR, show_multicast_router,
	208	store_multicast_router);
50426b59	209
c2d3babf	210	BRPORT_ATTR_FLAG(multicast_fast_leave, BR_MULTICAST_FAST_LEAVE);
6db6f0ea	211	BRPORT_ATTR_FLAG(multicast_to_unicast, BR_MULTICAST_TO_UNICAST);
0909e117 HX	212	#endif
0909e117 HX	213
5a0d513b	214	static const struct brport_attribute *brport_attrs[] = {
1da177e4 LT	215	&brport_attr_path_cost,
	216	&brport_attr_priority,
	217	&brport_attr_port_id,
	218	&brport_attr_port_no,
	219	&brport_attr_designated_root,
	220	&brport_attr_designated_bridge,
	221	&brport_attr_designated_port,
	222	&brport_attr_designated_cost,
	223	&brport_attr_state,
	224	&brport_attr_change_ack,
	225	&brport_attr_config_pending,
	226	&brport_attr_message_age_timer,
	227	&brport_attr_forward_delay_timer,
	228	&brport_attr_hold_timer,
9cf63747	229	&brport_attr_flush,
3982d3d2	230	&brport_attr_hairpin_mode,
a2e01a65	231	&brport_attr_bpdu_guard,
1007dd1a	232	&brport_attr_root_block,
9ba18891	233	&brport_attr_learning,
867a5943	234	&brport_attr_unicast_flood,
0909e117 HX	235	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
0909e117 HX	236	&brport_attr_multicast_router,
50426b59	237	&brport_attr_multicast_fast_leave,
6db6f0ea	238	&brport_attr_multicast_to_unicast,
0909e117	239	#endif
95850116	240	&brport_attr_proxyarp,
842a9ae0	241	&brport_attr_proxyarp_wifi,
4eb6753c	242	&brport_attr_multicast_flood,
99f906e9	243	&brport_attr_broadcast_flood,
5af48b59	244	&brport_attr_group_fwd_mask,
821f1b21	245	&brport_attr_neigh_suppress,
1da177e4 LT	246	NULL
	247	};
	248
	249	#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
1da177e4	250
56b148eb	251	static ssize_t brport_show(struct kobject *kobj,
56b148eb	252	struct attribute attr, char buf)
1da177e4	253	{
56b148eb	254	struct brport_attribute *brport_attr = to_brport_attr(attr);
6e340a7a	255	struct net_bridge_port *p = kobj_to_brport(kobj);
1da177e4	256
55d369c7 XL	257	if (!brport_attr->show)
	258	return -EINVAL;
	259
1da177e4 LT	260	return brport_attr->show(p, buf);
	261	}
	262
56b148eb	263	static ssize_t brport_store(struct kobject *kobj,
	264	struct attribute *attr,
	265	const char *buf, size_t count)
1da177e4	266	{
56b148eb	267	struct brport_attribute *brport_attr = to_brport_attr(attr);
6e340a7a	268	struct net_bridge_port *p = kobj_to_brport(kobj);
1da177e4 LT	269	ssize_t ret = -EINVAL;
	270	char *endp;
	271	unsigned long val;
	272
cb990503	273	if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
1da177e4 LT	274	return -EPERM;
	275
	276	val = simple_strtoul(buf, &endp, 0);
	277	if (endp != buf) {
af38f298 EB	278	if (!rtnl_trylock())
af38f298 EB	279	return restart_syscall();
1da177e4 LT	280	if (p->dev && p->br && brport_attr->store) {
	281	spin_lock_bh(&p->br->lock);
	282	ret = brport_attr->store(p, val);
	283	spin_unlock_bh(&p->br->lock);
bdaf0d5d	284	if (!ret) {
92899063	285	br_ifinfo_notify(RTM_NEWLINK, NULL, p);
1da177e4	286	ret = count;
bdaf0d5d	287	}
1da177e4 LT	288	}
	289	rtnl_unlock();
	290	}
	291	return ret;
	292	}
	293
52cf25d0	294	const struct sysfs_ops brport_sysfs_ops = {
1da177e4 LT	295	.show = brport_show,
	296	.store = brport_store,
	297	};
	298
1da177e4 LT	299	/*
	300	* Add sysfs entries to ethernet device added to a bridge.
	301	* Creates a brport subdirectory with bridge attributes.
e0f43752	302	* Puts symlink in bridge's brif subdirectory
1da177e4 LT	303	*/
	304	int br_sysfs_addif(struct net_bridge_port *p)
	305	{
	306	struct net_bridge *br = p->br;
5a0d513b	307	const struct brport_attribute **a;
1da177e4 LT	308	int err;
1da177e4 LT	309
43cb76d9	310	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
1da177e4 LT	311	SYSFS_BRIDGE_PORT_LINK);
1da177e4 LT	312	if (err)
e0f43752	313	return err;
1da177e4 LT	314
	315	for (a = brport_attrs; *a; ++a) {
	316	err = sysfs_create_file(&p->kobj, &((*a)->attr));
	317	if (err)
e0f43752	318	return err;
1da177e4 LT	319	}
1da177e4 LT	320
e0f43752 SA	321	strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	322	return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
	323	}
	324
	325	/* Rename bridge's brif symlink */
	326	int br_sysfs_renameif(struct net_bridge_port *p)
	327	{
	328	struct net_bridge *br = p->br;
	329	int err;
	330
	331	/* If a rename fails, the rollback will cause another
	332	* rename call with the existing name.
	333	*/
	334	if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
	335	return 0;
	336
	337	err = sysfs_rename_link(br->ifobj, &p->kobj,
	338	p->sysfs_name, p->dev->name);
	339	if (err)
	340	netdev_notice(br->dev, "unable to rename link %s to %s",
	341	p->sysfs_name, p->dev->name);
	342	else
	343	strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	344
1da177e4 LT	345	return err;
1da177e4 LT	346	}