diff options
Diffstat (limited to 'net/bridge/br_sysfs_if.c')
| -rw-r--r-- | net/bridge/br_sysfs_if.c | 412 |
1 files changed, 412 insertions, 0 deletions
diff --git a/net/bridge/br_sysfs_if.c b/net/bridge/br_sysfs_if.c new file mode 100644 index 000000000..74fdd8105 --- /dev/null +++ b/net/bridge/br_sysfs_if.c @@ -0,0 +1,412 @@ +// 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; +} |