| /* |
| * 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) \ |
| 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); |
| br_ifinfo_notify(RTM_NEWLINK, p); |
| } |
| 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); |
| |
| 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); |
| |
| #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, |
| &brport_attr_learning, |
| &brport_attr_unicast_flood, |
| #ifdef CONFIG_BRIDGE_IGMP_SNOOPING |
| &brport_attr_multicast_router, |
| &brport_attr_multicast_fast_leave, |
| #endif |
| &brport_attr_proxyarp, |
| &brport_attr_proxyarp_wifi, |
| 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); |
| |
| 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 = 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; |
| } |