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487 lines
12 KiB
487 lines
12 KiB
/*
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* net-sysfs.c - network device class and attributes
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*
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* Copyright (c) 2003 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/capability.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <net/sock.h>
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#include <linux/rtnetlink.h>
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#include <linux/wireless.h>
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#include <net/iw_handler.h>
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static const char fmt_hex[] = "%#x\n";
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static const char fmt_long_hex[] = "%#lx\n";
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static const char fmt_dec[] = "%d\n";
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static const char fmt_ulong[] = "%lu\n";
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static inline int dev_isalive(const struct net_device *dev)
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{
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return dev->reg_state <= NETREG_REGISTERED;
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}
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/* use same locking rules as GIF* ioctl's */
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static ssize_t netdev_show(const struct device *dev,
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struct device_attribute *attr, char *buf,
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ssize_t (*format)(const struct net_device *, char *))
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{
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struct net_device *net = to_net_dev(dev);
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ssize_t ret = -EINVAL;
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read_lock(&dev_base_lock);
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if (dev_isalive(net))
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ret = (*format)(net, buf);
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read_unlock(&dev_base_lock);
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return ret;
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}
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/* generate a show function for simple field */
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#define NETDEVICE_SHOW(field, format_string) \
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static ssize_t format_##field(const struct net_device *net, char *buf) \
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{ \
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return sprintf(buf, format_string, net->field); \
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} \
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static ssize_t show_##field(struct device *dev, \
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struct device_attribute *attr, char *buf) \
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{ \
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return netdev_show(dev, attr, buf, format_##field); \
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}
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/* use same locking and permission rules as SIF* ioctl's */
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static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len,
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int (*set)(struct net_device *, unsigned long))
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{
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struct net_device *net = to_net_dev(dev);
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char *endp;
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unsigned long new;
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int ret = -EINVAL;
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if (!capable(CAP_NET_ADMIN))
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return -EPERM;
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new = simple_strtoul(buf, &endp, 0);
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if (endp == buf)
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goto err;
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rtnl_lock();
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if (dev_isalive(net)) {
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if ((ret = (*set)(net, new)) == 0)
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ret = len;
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}
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rtnl_unlock();
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err:
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return ret;
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}
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NETDEVICE_SHOW(addr_len, fmt_dec);
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NETDEVICE_SHOW(iflink, fmt_dec);
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NETDEVICE_SHOW(ifindex, fmt_dec);
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NETDEVICE_SHOW(features, fmt_long_hex);
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NETDEVICE_SHOW(type, fmt_dec);
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NETDEVICE_SHOW(link_mode, fmt_dec);
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/* use same locking rules as GIFHWADDR ioctl's */
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static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
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{
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int i;
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char *cp = buf;
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for (i = 0; i < len; i++)
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cp += sprintf(cp, "%02x%c", addr[i],
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i == (len - 1) ? '\n' : ':');
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return cp - buf;
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}
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static ssize_t show_address(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct net_device *net = to_net_dev(dev);
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ssize_t ret = -EINVAL;
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read_lock(&dev_base_lock);
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if (dev_isalive(net))
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ret = format_addr(buf, net->dev_addr, net->addr_len);
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read_unlock(&dev_base_lock);
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return ret;
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}
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static ssize_t show_broadcast(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *net = to_net_dev(dev);
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if (dev_isalive(net))
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return format_addr(buf, net->broadcast, net->addr_len);
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return -EINVAL;
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}
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static ssize_t show_carrier(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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if (netif_running(netdev)) {
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return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
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}
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return -EINVAL;
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}
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static ssize_t show_dormant(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct net_device *netdev = to_net_dev(dev);
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if (netif_running(netdev))
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return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
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return -EINVAL;
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}
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static const char *operstates[] = {
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"unknown",
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"notpresent", /* currently unused */
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"down",
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"lowerlayerdown",
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"testing", /* currently unused */
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"dormant",
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"up"
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};
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static ssize_t show_operstate(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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const struct net_device *netdev = to_net_dev(dev);
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unsigned char operstate;
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read_lock(&dev_base_lock);
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operstate = netdev->operstate;
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if (!netif_running(netdev))
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operstate = IF_OPER_DOWN;
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read_unlock(&dev_base_lock);
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if (operstate >= ARRAY_SIZE(operstates))
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return -EINVAL; /* should not happen */
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return sprintf(buf, "%s\n", operstates[operstate]);
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}
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/* read-write attributes */
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NETDEVICE_SHOW(mtu, fmt_dec);
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static int change_mtu(struct net_device *net, unsigned long new_mtu)
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{
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return dev_set_mtu(net, (int) new_mtu);
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}
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static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return netdev_store(dev, attr, buf, len, change_mtu);
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}
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NETDEVICE_SHOW(flags, fmt_hex);
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static int change_flags(struct net_device *net, unsigned long new_flags)
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{
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return dev_change_flags(net, (unsigned) new_flags);
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}
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static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return netdev_store(dev, attr, buf, len, change_flags);
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}
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NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
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static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
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{
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net->tx_queue_len = new_len;
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return 0;
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}
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static ssize_t store_tx_queue_len(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return netdev_store(dev, attr, buf, len, change_tx_queue_len);
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}
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NETDEVICE_SHOW(weight, fmt_dec);
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static int change_weight(struct net_device *net, unsigned long new_weight)
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{
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net->weight = new_weight;
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return 0;
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}
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static ssize_t store_weight(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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return netdev_store(dev, attr, buf, len, change_weight);
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}
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static struct device_attribute net_class_attributes[] = {
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__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
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__ATTR(iflink, S_IRUGO, show_iflink, NULL),
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__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
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__ATTR(features, S_IRUGO, show_features, NULL),
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__ATTR(type, S_IRUGO, show_type, NULL),
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__ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
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__ATTR(address, S_IRUGO, show_address, NULL),
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__ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
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__ATTR(carrier, S_IRUGO, show_carrier, NULL),
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__ATTR(dormant, S_IRUGO, show_dormant, NULL),
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__ATTR(operstate, S_IRUGO, show_operstate, NULL),
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__ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
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__ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
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__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
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store_tx_queue_len),
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__ATTR(weight, S_IRUGO | S_IWUSR, show_weight, store_weight),
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{}
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};
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/* Show a given an attribute in the statistics group */
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static ssize_t netstat_show(const struct device *d,
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struct device_attribute *attr, char *buf,
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unsigned long offset)
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{
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struct net_device *dev = to_net_dev(d);
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struct net_device_stats *stats;
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ssize_t ret = -EINVAL;
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if (offset > sizeof(struct net_device_stats) ||
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offset % sizeof(unsigned long) != 0)
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WARN_ON(1);
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read_lock(&dev_base_lock);
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if (dev_isalive(dev) && dev->get_stats &&
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(stats = (*dev->get_stats)(dev)))
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ret = sprintf(buf, fmt_ulong,
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*(unsigned long *)(((u8 *) stats) + offset));
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read_unlock(&dev_base_lock);
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return ret;
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}
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/* generate a read-only statistics attribute */
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#define NETSTAT_ENTRY(name) \
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static ssize_t show_##name(struct device *d, \
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struct device_attribute *attr, char *buf) \
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{ \
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return netstat_show(d, attr, buf, \
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offsetof(struct net_device_stats, name)); \
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} \
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static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
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NETSTAT_ENTRY(rx_packets);
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NETSTAT_ENTRY(tx_packets);
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NETSTAT_ENTRY(rx_bytes);
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NETSTAT_ENTRY(tx_bytes);
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NETSTAT_ENTRY(rx_errors);
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NETSTAT_ENTRY(tx_errors);
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NETSTAT_ENTRY(rx_dropped);
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NETSTAT_ENTRY(tx_dropped);
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NETSTAT_ENTRY(multicast);
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NETSTAT_ENTRY(collisions);
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NETSTAT_ENTRY(rx_length_errors);
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NETSTAT_ENTRY(rx_over_errors);
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NETSTAT_ENTRY(rx_crc_errors);
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NETSTAT_ENTRY(rx_frame_errors);
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NETSTAT_ENTRY(rx_fifo_errors);
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NETSTAT_ENTRY(rx_missed_errors);
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NETSTAT_ENTRY(tx_aborted_errors);
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NETSTAT_ENTRY(tx_carrier_errors);
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NETSTAT_ENTRY(tx_fifo_errors);
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NETSTAT_ENTRY(tx_heartbeat_errors);
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NETSTAT_ENTRY(tx_window_errors);
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NETSTAT_ENTRY(rx_compressed);
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NETSTAT_ENTRY(tx_compressed);
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static struct attribute *netstat_attrs[] = {
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&dev_attr_rx_packets.attr,
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&dev_attr_tx_packets.attr,
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&dev_attr_rx_bytes.attr,
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&dev_attr_tx_bytes.attr,
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&dev_attr_rx_errors.attr,
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&dev_attr_tx_errors.attr,
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&dev_attr_rx_dropped.attr,
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&dev_attr_tx_dropped.attr,
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&dev_attr_multicast.attr,
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&dev_attr_collisions.attr,
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&dev_attr_rx_length_errors.attr,
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&dev_attr_rx_over_errors.attr,
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&dev_attr_rx_crc_errors.attr,
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&dev_attr_rx_frame_errors.attr,
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&dev_attr_rx_fifo_errors.attr,
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&dev_attr_rx_missed_errors.attr,
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&dev_attr_tx_aborted_errors.attr,
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&dev_attr_tx_carrier_errors.attr,
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&dev_attr_tx_fifo_errors.attr,
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&dev_attr_tx_heartbeat_errors.attr,
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&dev_attr_tx_window_errors.attr,
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&dev_attr_rx_compressed.attr,
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&dev_attr_tx_compressed.attr,
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NULL
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};
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static struct attribute_group netstat_group = {
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.name = "statistics",
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.attrs = netstat_attrs,
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};
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#ifdef WIRELESS_EXT
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/* helper function that does all the locking etc for wireless stats */
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static ssize_t wireless_show(struct device *d, char *buf,
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ssize_t (*format)(const struct iw_statistics *,
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char *))
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{
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struct net_device *dev = to_net_dev(d);
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const struct iw_statistics *iw = NULL;
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ssize_t ret = -EINVAL;
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read_lock(&dev_base_lock);
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if (dev_isalive(dev)) {
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if(dev->wireless_handlers &&
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dev->wireless_handlers->get_wireless_stats)
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iw = dev->wireless_handlers->get_wireless_stats(dev);
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if (iw != NULL)
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ret = (*format)(iw, buf);
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}
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read_unlock(&dev_base_lock);
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return ret;
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}
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/* show function template for wireless fields */
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#define WIRELESS_SHOW(name, field, format_string) \
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static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
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{ \
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return sprintf(buf, format_string, iw->field); \
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} \
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static ssize_t show_iw_##name(struct device *d, \
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struct device_attribute *attr, char *buf) \
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{ \
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return wireless_show(d, buf, format_iw_##name); \
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} \
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static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
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WIRELESS_SHOW(status, status, fmt_hex);
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WIRELESS_SHOW(link, qual.qual, fmt_dec);
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WIRELESS_SHOW(level, qual.level, fmt_dec);
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WIRELESS_SHOW(noise, qual.noise, fmt_dec);
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WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
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WIRELESS_SHOW(crypt, discard.code, fmt_dec);
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WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
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WIRELESS_SHOW(misc, discard.misc, fmt_dec);
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WIRELESS_SHOW(retries, discard.retries, fmt_dec);
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WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
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static struct attribute *wireless_attrs[] = {
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&dev_attr_status.attr,
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&dev_attr_link.attr,
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&dev_attr_level.attr,
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&dev_attr_noise.attr,
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&dev_attr_nwid.attr,
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&dev_attr_crypt.attr,
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&dev_attr_fragment.attr,
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&dev_attr_retries.attr,
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&dev_attr_misc.attr,
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&dev_attr_beacon.attr,
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NULL
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};
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static struct attribute_group wireless_group = {
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.name = "wireless",
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.attrs = wireless_attrs,
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};
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#endif
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#ifdef CONFIG_HOTPLUG
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static int netdev_uevent(struct device *d, char **envp,
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int num_envp, char *buf, int size)
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{
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struct net_device *dev = to_net_dev(d);
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int i = 0;
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int n;
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/* pass interface to uevent. */
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envp[i++] = buf;
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n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
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buf += n;
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size -= n;
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if ((size <= 0) || (i >= num_envp))
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return -ENOMEM;
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envp[i] = NULL;
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return 0;
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}
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#endif
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/*
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* netdev_release -- destroy and free a dead device.
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* Called when last reference to device kobject is gone.
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*/
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static void netdev_release(struct device *d)
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{
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struct net_device *dev = to_net_dev(d);
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BUG_ON(dev->reg_state != NETREG_RELEASED);
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kfree((char *)dev - dev->padded);
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}
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static struct class net_class = {
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.name = "net",
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.dev_release = netdev_release,
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.dev_attrs = net_class_attributes,
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#ifdef CONFIG_HOTPLUG
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.dev_uevent = netdev_uevent,
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#endif
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};
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void netdev_unregister_sysfs(struct net_device * net)
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{
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device_del(&(net->dev));
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}
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/* Create sysfs entries for network device. */
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int netdev_register_sysfs(struct net_device *net)
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{
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struct device *dev = &(net->dev);
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struct attribute_group **groups = net->sysfs_groups;
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device_initialize(dev);
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dev->class = &net_class;
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dev->platform_data = net;
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dev->groups = groups;
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BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
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strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);
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if (net->get_stats)
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*groups++ = &netstat_group;
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#ifdef WIRELESS_EXT
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if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)
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*groups++ = &wireless_group;
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#endif
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return device_add(dev);
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}
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int netdev_sysfs_init(void)
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{
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return class_register(&net_class);
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}
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