// 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" 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) { 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); } 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_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, 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; } 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; }