/* * 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 <linux/times.h> #include "br_private.h" #define to_dev(obj) container_of(obj, struct device, kobj) #define to_bridge(cd) ((struct net_bridge *)(to_net_dev(cd)->priv)) /* * Common code for storing bridge parameters. */ static ssize_t store_bridge_parm(struct device *d, const char *buf, size_t len, void (*set)(struct net_bridge *, unsigned long)) { struct net_bridge *br = to_bridge(d); char *endp; unsigned long val; if (!capable(CAP_NET_ADMIN)) return -EPERM; val = simple_strtoul(buf, &endp, 0); if (endp == buf) return -EINVAL; spin_lock_bh(&br->lock); (*set)(br, val); spin_unlock_bh(&br->lock); return len; } static ssize_t show_forward_delay(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay)); } static void set_forward_delay(struct net_bridge *br, unsigned long val) { unsigned long delay = clock_t_to_jiffies(val); br->forward_delay = delay; if (br_is_root_bridge(br)) br->bridge_forward_delay = delay; } static ssize_t store_forward_delay(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { return store_bridge_parm(d, buf, len, set_forward_delay); } static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR, show_forward_delay, store_forward_delay); static ssize_t show_hello_time(struct device *d, struct device_attribute *attr, char *buf) { return sprintf(buf, "%lu\n", jiffies_to_clock_t(to_bridge(d)->hello_time)); } static void set_hello_time(struct net_bridge *br, unsigned long val) { unsigned long t = clock_t_to_jiffies(val); br->hello_time = t; if (br_is_root_bridge(br)) br->bridge_hello_time = t; } static ssize_t store_hello_time(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { return store_bridge_parm(d, buf, len, set_hello_time); } static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time, store_hello_time); static ssize_t show_max_age(struct device *d, struct device_attribute *attr, char *buf) { return sprintf(buf, "%lu\n", jiffies_to_clock_t(to_bridge(d)->max_age)); } static void set_max_age(struct net_bridge *br, unsigned long val) { unsigned long t = clock_t_to_jiffies(val); br->max_age = t; if (br_is_root_bridge(br)) br->bridge_max_age = t; } static ssize_t store_max_age(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { return store_bridge_parm(d, buf, len, set_max_age); } static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age); static ssize_t show_ageing_time(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time)); } static void set_ageing_time(struct net_bridge *br, unsigned long val) { br->ageing_time = clock_t_to_jiffies(val); } static ssize_t store_ageing_time(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { return store_bridge_parm(d, buf, len, set_ageing_time); } static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time, store_ageing_time); static ssize_t show_stp_state(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%d\n", br->stp_enabled); } static ssize_t store_stp_state(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { struct net_bridge *br = to_bridge(d); char *endp; unsigned long val; if (!capable(CAP_NET_ADMIN)) return -EPERM; val = simple_strtoul(buf, &endp, 0); if (endp == buf) return -EINVAL; rtnl_lock(); br_stp_set_enabled(br, val); rtnl_unlock(); return len; } static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state, store_stp_state); static ssize_t show_priority(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%d\n", (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]); } static void set_priority(struct net_bridge *br, unsigned long val) { br_stp_set_bridge_priority(br, (u16) val); } static ssize_t store_priority(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { return store_bridge_parm(d, buf, len, set_priority); } static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority); static ssize_t show_root_id(struct device *d, struct device_attribute *attr, char *buf) { return br_show_bridge_id(buf, &to_bridge(d)->designated_root); } static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL); static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr, char *buf) { return br_show_bridge_id(buf, &to_bridge(d)->bridge_id); } static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL); static ssize_t show_root_port(struct device *d, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", to_bridge(d)->root_port); } static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL); static ssize_t show_root_path_cost(struct device *d, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost); } static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL); static ssize_t show_topology_change(struct device *d, struct device_attribute *attr, char *buf) { return sprintf(buf, "%d\n", to_bridge(d)->topology_change); } static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL); static ssize_t show_topology_change_detected(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%d\n", br->topology_change_detected); } static DEVICE_ATTR(topology_change_detected, S_IRUGO, show_topology_change_detected, NULL); static ssize_t show_hello_timer(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer)); } static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL); static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer)); } static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL); static ssize_t show_topology_change_timer(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer)); } static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, NULL); static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer)); } static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL); static ssize_t show_group_addr(struct device *d, struct device_attribute *attr, char *buf) { struct net_bridge *br = to_bridge(d); return sprintf(buf, "%x:%x:%x:%x:%x:%x\n", br->group_addr[0], br->group_addr[1], br->group_addr[2], br->group_addr[3], br->group_addr[4], br->group_addr[5]); } static ssize_t store_group_addr(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { struct net_bridge *br = to_bridge(d); unsigned new_addr[6]; int i; if (!capable(CAP_NET_ADMIN)) return -EPERM; if (sscanf(buf, "%x:%x:%x:%x:%x:%x", &new_addr[0], &new_addr[1], &new_addr[2], &new_addr[3], &new_addr[4], &new_addr[5]) != 6) return -EINVAL; /* Must be 01:80:c2:00:00:0X */ for (i = 0; i < 5; i++) if (new_addr[i] != br_group_address[i]) return -EINVAL; if (new_addr[5] & ~0xf) return -EINVAL; if (new_addr[5] == 1 /* 802.3x Pause address */ || new_addr[5] == 2 /* 802.3ad Slow protocols */ || new_addr[5] == 3) /* 802.1X PAE address */ return -EINVAL; spin_lock_bh(&br->lock); for (i = 0; i < 6; i++) br->group_addr[i] = new_addr[i]; spin_unlock_bh(&br->lock); return len; } static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR, show_group_addr, store_group_addr); static ssize_t store_flush(struct device *d, struct device_attribute *attr, const char *buf, size_t len) { struct net_bridge *br = to_bridge(d); if (!capable(CAP_NET_ADMIN)) return -EPERM; br_fdb_flush(br); return len; } static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush); static struct attribute *bridge_attrs[] = { &dev_attr_forward_delay.attr, &dev_attr_hello_time.attr, &dev_attr_max_age.attr, &dev_attr_ageing_time.attr, &dev_attr_stp_state.attr, &dev_attr_priority.attr, &dev_attr_bridge_id.attr, &dev_attr_root_id.attr, &dev_attr_root_path_cost.attr, &dev_attr_root_port.attr, &dev_attr_topology_change.attr, &dev_attr_topology_change_detected.attr, &dev_attr_hello_timer.attr, &dev_attr_tcn_timer.attr, &dev_attr_topology_change_timer.attr, &dev_attr_gc_timer.attr, &dev_attr_group_addr.attr, &dev_attr_flush.attr, NULL }; static struct attribute_group bridge_group = { .name = SYSFS_BRIDGE_ATTR, .attrs = bridge_attrs, }; /* * Export the forwarding information table as a binary file * The records are struct __fdb_entry. * * Returns the number of bytes read. */ static ssize_t brforward_read(struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct device *dev = to_dev(kobj); struct net_bridge *br = to_bridge(dev); int n; /* must read whole records */ if (off % sizeof(struct __fdb_entry) != 0) return -EINVAL; n = br_fdb_fillbuf(br, buf, count / sizeof(struct __fdb_entry), off / sizeof(struct __fdb_entry)); if (n > 0) n *= sizeof(struct __fdb_entry); return n; } static struct bin_attribute bridge_forward = { .attr = { .name = SYSFS_BRIDGE_FDB, .mode = S_IRUGO, }, .read = brforward_read, }; /* * Add entries in sysfs onto the existing network class device * for the bridge. * Adds a attribute group "bridge" containing tuning parameters. * Binary attribute containing the forward table * Sub directory to hold links to interfaces. * * Note: the ifobj exists only to be a subdirectory * to hold links. The ifobj exists in same data structure * as it's parent the bridge so reference counting works. */ int br_sysfs_addbr(struct net_device *dev) { struct kobject *brobj = &dev->dev.kobj; struct net_bridge *br = netdev_priv(dev); int err; err = sysfs_create_group(brobj, &bridge_group); if (err) { pr_info("%s: can't create group %s/%s\n", __func__, dev->name, bridge_group.name); goto out1; } err = sysfs_create_bin_file(brobj, &bridge_forward); if (err) { pr_info("%s: can't create attribute file %s/%s\n", __func__, dev->name, bridge_forward.attr.name); goto out2; } br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj); if (!br->ifobj) { pr_info("%s: can't add kobject (directory) %s/%s\n", __func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR); goto out3; } return 0; out3: sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward); out2: sysfs_remove_group(&dev->dev.kobj, &bridge_group); out1: return err; } void br_sysfs_delbr(struct net_device *dev) { struct kobject *kobj = &dev->dev.kobj; struct net_bridge *br = netdev_priv(dev); kobject_put(br->ifobj); sysfs_remove_bin_file(kobj, &bridge_forward); sysfs_remove_group(kobj, &bridge_group); }