net/bridge/br_sysfs_if.c - kernel/common - Git at Google

 /*
  *	Sysfs attributes of bridge ports
  *	Linux ethernet bridge
  *
  *	Authors:
  *	Stephen Hemminger		<[email protected]>
  *
  *	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)		        \
 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) \
 {								\
 	unsigned long flags = p->flags;				\
 	if (v)							\
 		flags |= _mask;					\
 	else							\
 		flags &= ~_mask;				\
 	if (flags != p->flags) {				\
 		p->flags = flags;				\
 		br_ifinfo_notify(RTM_NEWLINK, p);		\
 	}							\
 	return 0;						\
 }								\
 static BRPORT_ATTR(_name, S_IRUGO | S_IWUSR,			\
 		   show_##_name, store_##_name)


 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);

 BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
 BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
 BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);

 #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);
 #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,
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	&brport_attr_multicast_router,
 	&brport_attr_multicast_fast_leave,
 #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 (!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 == 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;
 	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;
 }
	/*
	* Sysfs attributes of bridge ports
	* Linux ethernet bridge
	*
	* Authors:
	* Stephen Hemminger <[email protected]>
	*
	* 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) \
	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) \
	{ \
	unsigned long flags = p->flags; \
	if (v) \
	flags \|= _mask; \
	else \
	flags &= ~_mask; \
	if (flags != p->flags) { \
	p->flags = flags; \
	br_ifinfo_notify(RTM_NEWLINK, p); \
	} \
	return 0; \
	} \
	static BRPORT_ATTR(_name, S_IRUGO \| S_IWUSR, \
	show_##_name, store_##_name)


	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);

	BRPORT_ATTR_FLAG(hairpin_mode, BR_HAIRPIN_MODE);
	BRPORT_ATTR_FLAG(bpdu_guard, BR_BPDU_GUARD);
	BRPORT_ATTR_FLAG(root_block, BR_ROOT_BLOCK);

	#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);
	#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,
	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	&brport_attr_multicast_router,
	&brport_attr_multicast_fast_leave,
	#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 (!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 == 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;
	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;
	}