365 lines
10 KiB
C
365 lines
10 KiB
C
/*
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* Sysfs attributes of bridge ports
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* Linux ethernet bridge
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*
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* Authors:
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* Stephen Hemminger <shemminger@osdl.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/if_bridge.h>
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#include <linux/rtnetlink.h>
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#include <linux/spinlock.h>
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#include <linux/times.h>
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#include "br_private.h"
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#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
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#define to_net_dev(class) container_of(class, struct net_device, class_dev)
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#define to_bridge(cd) ((struct net_bridge *)(to_net_dev(cd)->priv))
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/*
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* Common code for storing bridge parameters.
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*/
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static ssize_t store_bridge_parm(struct class_device *cd,
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const char *buf, size_t len,
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void (*set)(struct net_bridge *, unsigned long))
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{
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struct net_bridge *br = to_bridge(cd);
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char *endp;
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unsigned long val;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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val = simple_strtoul(buf, &endp, 0);
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if (endp == buf)
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return -EINVAL;
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spin_lock_bh(&br->lock);
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(*set)(br, val);
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spin_unlock_bh(&br->lock);
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return len;
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}
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static ssize_t show_forward_delay(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
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}
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static void set_forward_delay(struct net_bridge *br, unsigned long val)
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{
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unsigned long delay = clock_t_to_jiffies(val);
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br->forward_delay = delay;
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if (br_is_root_bridge(br))
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br->bridge_forward_delay = delay;
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}
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static ssize_t store_forward_delay(struct class_device *cd, const char *buf,
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size_t len)
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{
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return store_bridge_parm(cd, buf, len, set_forward_delay);
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}
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static CLASS_DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
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show_forward_delay, store_forward_delay);
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static ssize_t show_hello_time(struct class_device *cd, char *buf)
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{
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return sprintf(buf, "%lu\n",
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jiffies_to_clock_t(to_bridge(cd)->hello_time));
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}
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static void set_hello_time(struct net_bridge *br, unsigned long val)
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{
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unsigned long t = clock_t_to_jiffies(val);
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br->hello_time = t;
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if (br_is_root_bridge(br))
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br->bridge_hello_time = t;
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}
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static ssize_t store_hello_time(struct class_device *cd, const char *buf,
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size_t len)
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{
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return store_bridge_parm(cd, buf, len, set_hello_time);
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}
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static CLASS_DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
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store_hello_time);
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static ssize_t show_max_age(struct class_device *cd, char *buf)
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{
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return sprintf(buf, "%lu\n",
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jiffies_to_clock_t(to_bridge(cd)->max_age));
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}
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static void set_max_age(struct net_bridge *br, unsigned long val)
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{
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unsigned long t = clock_t_to_jiffies(val);
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br->max_age = t;
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if (br_is_root_bridge(br))
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br->bridge_max_age = t;
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}
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static ssize_t store_max_age(struct class_device *cd, const char *buf,
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size_t len)
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{
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return store_bridge_parm(cd, buf, len, set_max_age);
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}
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static CLASS_DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age,
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store_max_age);
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static ssize_t show_ageing_time(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
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}
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static void set_ageing_time(struct net_bridge *br, unsigned long val)
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{
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br->ageing_time = clock_t_to_jiffies(val);
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}
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static ssize_t store_ageing_time(struct class_device *cd, const char *buf,
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size_t len)
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{
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return store_bridge_parm(cd, buf, len, set_ageing_time);
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}
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static CLASS_DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
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store_ageing_time);
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static ssize_t show_stp_state(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%d\n", br->stp_enabled);
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}
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static void set_stp_state(struct net_bridge *br, unsigned long val)
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{
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br->stp_enabled = val;
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}
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static ssize_t store_stp_state(struct class_device *cd,
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const char *buf, size_t len)
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{
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return store_bridge_parm(cd, buf, len, set_stp_state);
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}
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static CLASS_DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
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store_stp_state);
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static ssize_t show_priority(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%d\n",
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(br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
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}
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static void set_priority(struct net_bridge *br, unsigned long val)
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{
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br_stp_set_bridge_priority(br, (u16) val);
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}
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static ssize_t store_priority(struct class_device *cd,
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const char *buf, size_t len)
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{
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return store_bridge_parm(cd, buf, len, set_priority);
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}
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static CLASS_DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority,
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store_priority);
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static ssize_t show_root_id(struct class_device *cd, char *buf)
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{
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return br_show_bridge_id(buf, &to_bridge(cd)->designated_root);
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}
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static CLASS_DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);
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static ssize_t show_bridge_id(struct class_device *cd, char *buf)
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{
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return br_show_bridge_id(buf, &to_bridge(cd)->bridge_id);
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}
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static CLASS_DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);
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static ssize_t show_root_port(struct class_device *cd, char *buf)
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{
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return sprintf(buf, "%d\n", to_bridge(cd)->root_port);
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}
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static CLASS_DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);
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static ssize_t show_root_path_cost(struct class_device *cd, char *buf)
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{
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return sprintf(buf, "%d\n", to_bridge(cd)->root_path_cost);
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}
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static CLASS_DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);
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static ssize_t show_topology_change(struct class_device *cd, char *buf)
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{
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return sprintf(buf, "%d\n", to_bridge(cd)->topology_change);
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}
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static CLASS_DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);
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static ssize_t show_topology_change_detected(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%d\n", br->topology_change_detected);
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}
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static CLASS_DEVICE_ATTR(topology_change_detected, S_IRUGO, show_topology_change_detected, NULL);
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static ssize_t show_hello_timer(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
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}
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static CLASS_DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);
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static ssize_t show_tcn_timer(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
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}
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static CLASS_DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);
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static ssize_t show_topology_change_timer(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
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}
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static CLASS_DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer, NULL);
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static ssize_t show_gc_timer(struct class_device *cd, char *buf)
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{
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struct net_bridge *br = to_bridge(cd);
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return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
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}
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static CLASS_DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);
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static struct attribute *bridge_attrs[] = {
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&class_device_attr_forward_delay.attr,
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&class_device_attr_hello_time.attr,
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&class_device_attr_max_age.attr,
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&class_device_attr_ageing_time.attr,
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&class_device_attr_stp_state.attr,
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&class_device_attr_priority.attr,
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&class_device_attr_bridge_id.attr,
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&class_device_attr_root_id.attr,
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&class_device_attr_root_path_cost.attr,
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&class_device_attr_root_port.attr,
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&class_device_attr_topology_change.attr,
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&class_device_attr_topology_change_detected.attr,
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&class_device_attr_hello_timer.attr,
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&class_device_attr_tcn_timer.attr,
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&class_device_attr_topology_change_timer.attr,
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&class_device_attr_gc_timer.attr,
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NULL
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};
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static struct attribute_group bridge_group = {
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.name = SYSFS_BRIDGE_ATTR,
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.attrs = bridge_attrs,
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};
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/*
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* Export the forwarding information table as a binary file
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* The records are struct __fdb_entry.
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*
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* Returns the number of bytes read.
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*/
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static ssize_t brforward_read(struct kobject *kobj, char *buf,
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loff_t off, size_t count)
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{
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struct class_device *cdev = to_class_dev(kobj);
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struct net_bridge *br = to_bridge(cdev);
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int n;
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/* must read whole records */
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if (off % sizeof(struct __fdb_entry) != 0)
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return -EINVAL;
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n = br_fdb_fillbuf(br, buf,
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count / sizeof(struct __fdb_entry),
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off / sizeof(struct __fdb_entry));
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if (n > 0)
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n *= sizeof(struct __fdb_entry);
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return n;
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}
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static struct bin_attribute bridge_forward = {
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.attr = { .name = SYSFS_BRIDGE_FDB,
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.mode = S_IRUGO,
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.owner = THIS_MODULE, },
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.read = brforward_read,
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};
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/*
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* Add entries in sysfs onto the existing network class device
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* for the bridge.
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* Adds a attribute group "bridge" containing tuning parameters.
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* Binary attribute containing the forward table
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* Sub directory to hold links to interfaces.
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*
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* Note: the ifobj exists only to be a subdirectory
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* to hold links. The ifobj exists in same data structure
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* as it's parent the bridge so reference counting works.
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*/
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int br_sysfs_addbr(struct net_device *dev)
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{
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struct kobject *brobj = &dev->class_dev.kobj;
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struct net_bridge *br = netdev_priv(dev);
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int err;
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err = sysfs_create_group(brobj, &bridge_group);
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if (err) {
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pr_info("%s: can't create group %s/%s\n",
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__FUNCTION__, dev->name, bridge_group.name);
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goto out1;
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}
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err = sysfs_create_bin_file(brobj, &bridge_forward);
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if (err) {
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pr_info("%s: can't create attribue file %s/%s\n",
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__FUNCTION__, dev->name, bridge_forward.attr.name);
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goto out2;
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}
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kobject_set_name(&br->ifobj, SYSFS_BRIDGE_PORT_SUBDIR);
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br->ifobj.ktype = NULL;
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br->ifobj.kset = NULL;
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br->ifobj.parent = brobj;
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err = kobject_register(&br->ifobj);
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if (err) {
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pr_info("%s: can't add kobject (directory) %s/%s\n",
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__FUNCTION__, dev->name, br->ifobj.name);
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goto out3;
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}
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return 0;
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out3:
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sysfs_remove_bin_file(&dev->class_dev.kobj, &bridge_forward);
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out2:
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sysfs_remove_group(&dev->class_dev.kobj, &bridge_group);
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out1:
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return err;
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}
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void br_sysfs_delbr(struct net_device *dev)
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{
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struct kobject *kobj = &dev->class_dev.kobj;
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struct net_bridge *br = netdev_priv(dev);
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kobject_unregister(&br->ifobj);
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sysfs_remove_bin_file(kobj, &bridge_forward);
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sysfs_remove_group(kobj, &bridge_group);
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}
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