/* * 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 *); ssize_t (*store)(struct net_bridge_port *, unsigned long); }; #define BRPORT_ATTR(_name,_mode,_show,_store) \ struct brport_attribute brport_attr_##_name = { \ .attr = {.name = __stringify(_name), \ .mode = _mode }, \ .show = _show, \ .store = _store, \ }; static ssize_t show_path_cost(struct net_bridge_port *p, char *buf) { return sprintf(buf, "%d\n", p->path_cost); } static ssize_t store_path_cost(struct net_bridge_port *p, unsigned long v) { br_stp_set_path_cost(p, v); return 0; } static BRPORT_ATTR(path_cost, S_IRUGO | S_IWUSR, show_path_cost, store_path_cost); static ssize_t show_priority(struct net_bridge_port *p, char *buf) { return sprintf(buf, "%d\n", p->priority); } static ssize_t store_priority(struct net_bridge_port *p, unsigned long v) { if (v >= (1<<(16-BR_PORT_BITS))) return -ERANGE; br_stp_set_port_priority(p, v); return 0; } static BRPORT_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_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 ssize_t 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); static ssize_t show_hairpin_mode(struct net_bridge_port *p, char *buf) { int hairpin_mode = (p->flags & BR_HAIRPIN_MODE) ? 1 : 0; return sprintf(buf, "%d\n", hairpin_mode); } static ssize_t store_hairpin_mode(struct net_bridge_port *p, unsigned long v) { if (v) p->flags |= BR_HAIRPIN_MODE; else p->flags &= ~BR_HAIRPIN_MODE; return 0; } static BRPORT_ATTR(hairpin_mode, S_IRUGO | S_IWUSR, show_hairpin_mode, store_hairpin_mode); static 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, 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 (!capable(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; } 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 brport subdirectory */ int br_sysfs_addif(struct net_bridge_port *p) { struct net_bridge *br = p->br; struct brport_attribute **a; int err; err = sysfs_create_link(&p->kobj, &br->dev->dev.kobj, SYSFS_BRIDGE_PORT_LINK); if (err) goto out2; for (a = brport_attrs; *a; ++a) { err = sysfs_create_file(&p->kobj, &((*a)->attr)); if (err) goto out2; } err = sysfs_create_link(br->ifobj, &p->kobj, p->dev->name); out2: return err; }