[GitHub/mt8127/android_kernel_alcatel_ttab.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 "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)		        \
struct brport_attribute brport_attr_##_name = { 	        \
	.attr = {.name = __stringify(_name), 			\
		 .mode = _mode },				\
	.show	= _show,					\
	.store	= _store,					\
};

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); // Don't delete local entry
	return 0;
}
static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);

static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf)
{
	int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0;
	return sprintf(buf, "%d\n", hairpin_mode);
}
static int store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
{
	if (v)
		p->flags |= BR_HAIRPIN_MODE;
	else
		p->flags &= ~BR_HAIRPIN_MODE;
	return 0;
}
static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR,
		   show_hairpin_mode, store_hairpin_mode);

#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);
#endif

static 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,
#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	&brport_attr_multicast_router,
#endif
	NULL
};

#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
#define to_brport(obj)	container_of(obj, struct net_bridge_port, kobj)

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 = to_brport(kobj);

	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 = to_brport(kobj);
	ssize_t ret = -EINVAL;
	char *endp;
	unsigned long val;

	if (!capable(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 == 0)
				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;
	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>
	20
	21	#include "br_private.h"
	22
	23	struct brport_attribute {
	24	struct attribute attr;
	25	ssize_t (show)(struct net_bridge_port , char *);
14f98f25	26	int (store)(struct net_bridge_port , unsigned long);
1da177e4 LT	27	};
	28
	29	#define BRPORT_ATTR(_name,_mode,_show,_store) \
	30	struct brport_attribute brport_attr_##_name = { \
	31	.attr = {.name = __stringify(_name), \
7b595756	32	.mode = _mode }, \
1da177e4 LT	33	.show = _show, \
	34	.store = _store, \
	35	};
	36
	37	static ssize_t show_path_cost(struct net_bridge_port p, char buf)
	38	{
	39	return sprintf(buf, "%d\n", p->path_cost);
	40	}
14f98f25	41
1da177e4	42	static BRPORT_ATTR(path_cost, S_IRUGO \| S_IWUSR,
14f98f25	43	show_path_cost, br_stp_set_path_cost);
1da177e4 LT	44
	45	static ssize_t show_priority(struct net_bridge_port p, char buf)
	46	{
	47	return sprintf(buf, "%d\n", p->priority);
	48	}
14f98f25	49
1da177e4	50	static BRPORT_ATTR(priority, S_IRUGO \| S_IWUSR,
14f98f25	51	show_priority, br_stp_set_port_priority);
1da177e4 LT	52
	53	static ssize_t show_designated_root(struct net_bridge_port p, char buf)
	54	{
	55	return br_show_bridge_id(buf, &p->designated_root);
	56	}
	57	static BRPORT_ATTR(designated_root, S_IRUGO, show_designated_root, NULL);
	58
	59	static ssize_t show_designated_bridge(struct net_bridge_port p, char buf)
	60	{
	61	return br_show_bridge_id(buf, &p->designated_bridge);
	62	}
	63	static BRPORT_ATTR(designated_bridge, S_IRUGO, show_designated_bridge, NULL);
	64
	65	static ssize_t show_designated_port(struct net_bridge_port p, char buf)
	66	{
	67	return sprintf(buf, "%d\n", p->designated_port);
	68	}
	69	static BRPORT_ATTR(designated_port, S_IRUGO, show_designated_port, NULL);
	70
	71	static ssize_t show_designated_cost(struct net_bridge_port p, char buf)
	72	{
	73	return sprintf(buf, "%d\n", p->designated_cost);
	74	}
	75	static BRPORT_ATTR(designated_cost, S_IRUGO, show_designated_cost, NULL);
	76
	77	static ssize_t show_port_id(struct net_bridge_port p, char buf)
	78	{
	79	return sprintf(buf, "0x%x\n", p->port_id);
	80	}
	81	static BRPORT_ATTR(port_id, S_IRUGO, show_port_id, NULL);
	82
	83	static ssize_t show_port_no(struct net_bridge_port p, char buf)
	84	{
	85	return sprintf(buf, "0x%x\n", p->port_no);
	86	}
	87
	88	static BRPORT_ATTR(port_no, S_IRUGO, show_port_no, NULL);
	89
	90	static ssize_t show_change_ack(struct net_bridge_port p, char buf)
	91	{
	92	return sprintf(buf, "%d\n", p->topology_change_ack);
	93	}
	94	static BRPORT_ATTR(change_ack, S_IRUGO, show_change_ack, NULL);
	95
	96	static ssize_t show_config_pending(struct net_bridge_port p, char buf)
	97	{
	98	return sprintf(buf, "%d\n", p->config_pending);
	99	}
	100	static BRPORT_ATTR(config_pending, S_IRUGO, show_config_pending, NULL);
	101
	102	static ssize_t show_port_state(struct net_bridge_port p, char buf)
	103	{
	104	return sprintf(buf, "%d\n", p->state);
	105	}
	106	static BRPORT_ATTR(state, S_IRUGO, show_port_state, NULL);
	107
	108	static ssize_t show_message_age_timer(struct net_bridge_port *p,
	109	char *buf)
	110	{
	111	return sprintf(buf, "%ld\n", br_timer_value(&p->message_age_timer));
	112	}
	113	static BRPORT_ATTR(message_age_timer, S_IRUGO, show_message_age_timer, NULL);
	114
	115	static ssize_t show_forward_delay_timer(struct net_bridge_port *p,
116	char *buf)
117	{
118	return sprintf(buf, "%ld\n", br_timer_value(&p->forward_delay_timer));
119	}
120	static BRPORT_ATTR(forward_delay_timer, S_IRUGO, show_forward_delay_timer, NULL);
121
122	static ssize_t show_hold_timer(struct net_bridge_port *p,
123	char *buf)
124	{
125	return sprintf(buf, "%ld\n", br_timer_value(&p->hold_timer));
126	}
127	static BRPORT_ATTR(hold_timer, S_IRUGO, show_hold_timer, NULL);
128
14f98f25	129	static int store_flush(struct net_bridge_port *p, unsigned long v)
9cf63747 SH	130	{
	131	br_fdb_delete_by_port(p->br, p, 0); // Don't delete local entry
	132	return 0;
	133	}
	134	static BRPORT_ATTR(flush, S_IWUSR, NULL, store_flush);
	135
3982d3d2 FA	136	static ssize_t show_hairpin_mode(struct net_bridge_port p, char buf)
	137	{
	138	int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0;
	139	return sprintf(buf, "%d\n", hairpin_mode);
	140	}
14f98f25	141	static int store_hairpin_mode(struct net_bridge_port *p, unsigned long v)
3982d3d2 FA	142	{
	143	if (v)
	144	p->flags \|= BR_HAIRPIN_MODE;
	145	else
	146	p->flags &= ~BR_HAIRPIN_MODE;
	147	return 0;
	148	}
	149	static BRPORT_ATTR(hairpin_mode, S_IRUGO \| S_IWUSR,
	150	show_hairpin_mode, store_hairpin_mode);
	151
0909e117 HX	152	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	153	static ssize_t show_multicast_router(struct net_bridge_port p, char buf)
	154	{
	155	return sprintf(buf, "%d\n", p->multicast_router);
	156	}
	157
14f98f25	158	static int store_multicast_router(struct net_bridge_port *p,
0909e117 HX	159	unsigned long v)
	160	{
	161	return br_multicast_set_port_router(p, v);
	162	}
	163	static BRPORT_ATTR(multicast_router, S_IRUGO \| S_IWUSR, show_multicast_router,
	164	store_multicast_router);
	165	#endif
	166
1da177e4 LT	167	static struct brport_attribute *brport_attrs[] = {
	168	&brport_attr_path_cost,
	169	&brport_attr_priority,
	170	&brport_attr_port_id,
	171	&brport_attr_port_no,
	172	&brport_attr_designated_root,
	173	&brport_attr_designated_bridge,
	174	&brport_attr_designated_port,
	175	&brport_attr_designated_cost,
	176	&brport_attr_state,
	177	&brport_attr_change_ack,
	178	&brport_attr_config_pending,
	179	&brport_attr_message_age_timer,
	180	&brport_attr_forward_delay_timer,
	181	&brport_attr_hold_timer,
9cf63747	182	&brport_attr_flush,
3982d3d2	183	&brport_attr_hairpin_mode,
0909e117 HX	184	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	185	&brport_attr_multicast_router,
	186	#endif
1da177e4 LT	187	NULL
	188	};
	189
	190	#define to_brport_attr(_at) container_of(_at, struct brport_attribute, attr)
	191	#define to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
	192
	193	static ssize_t brport_show(struct kobject * kobj,
	194	struct attribute * attr, char * buf)
	195	{
	196	struct brport_attribute * brport_attr = to_brport_attr(attr);
	197	struct net_bridge_port * p = to_brport(kobj);
	198
	199	return brport_attr->show(p, buf);
	200	}
	201
	202	static ssize_t brport_store(struct kobject * kobj,
	203	struct attribute * attr,
	204	const char * buf, size_t count)
	205	{
	206	struct brport_attribute * brport_attr = to_brport_attr(attr);
	207	struct net_bridge_port * p = to_brport(kobj);
	208	ssize_t ret = -EINVAL;
	209	char *endp;
	210	unsigned long val;
	211
	212	if (!capable(CAP_NET_ADMIN))
	213	return -EPERM;
	214
	215	val = simple_strtoul(buf, &endp, 0);
	216	if (endp != buf) {
af38f298 EB	217	if (!rtnl_trylock())
af38f298 EB	218	return restart_syscall();
1da177e4 LT	219	if (p->dev && p->br && brport_attr->store) {
	220	spin_lock_bh(&p->br->lock);
	221	ret = brport_attr->store(p, val);
	222	spin_unlock_bh(&p->br->lock);
	223	if (ret == 0)
	224	ret = count;
	225	}
	226	rtnl_unlock();
	227	}
	228	return ret;
	229	}
	230
52cf25d0	231	const struct sysfs_ops brport_sysfs_ops = {
1da177e4 LT	232	.show = brport_show,
	233	.store = brport_store,
	234	};
	235
1da177e4 LT	236	/*
	237	* Add sysfs entries to ethernet device added to a bridge.
	238	* Creates a brport subdirectory with bridge attributes.
e0f43752	239	* Puts symlink in bridge's brif subdirectory
1da177e4 LT	240	*/
	241	int br_sysfs_addif(struct net_bridge_port *p)
	242	{
	243	struct net_bridge *br = p->br;
	244	struct brport_attribute **a;
	245	int err;
	246
43cb76d9	247	err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj,
1da177e4 LT	248	SYSFS_BRIDGE_PORT_LINK);
1da177e4 LT	249	if (err)
e0f43752	250	return err;
1da177e4 LT	251
	252	for (a = brport_attrs; *a; ++a) {
	253	err = sysfs_create_file(&p->kobj, &((*a)->attr));
	254	if (err)
e0f43752	255	return err;
1da177e4 LT	256	}
1da177e4 LT	257
e0f43752 SA	258	strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	259	return sysfs_create_link(br->ifobj, &p->kobj, p->sysfs_name);
	260	}
	261
	262	/* Rename bridge's brif symlink */
	263	int br_sysfs_renameif(struct net_bridge_port *p)
	264	{
	265	struct net_bridge *br = p->br;
	266	int err;
	267
	268	/* If a rename fails, the rollback will cause another
	269	* rename call with the existing name.
	270	*/
	271	if (!strncmp(p->sysfs_name, p->dev->name, IFNAMSIZ))
	272	return 0;
	273
	274	err = sysfs_rename_link(br->ifobj, &p->kobj,
	275	p->sysfs_name, p->dev->name);
	276	if (err)
	277	netdev_notice(br->dev, "unable to rename link %s to %s",
	278	p->sysfs_name, p->dev->name);
	279	else
	280	strlcpy(p->sysfs_name, p->dev->name, IFNAMSIZ);
	281
1da177e4 LT	282	return err;
1da177e4 LT	283	}