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// 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;
}