1 files changed, 461 insertions, 0 deletions

diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c
new file mode 100644
index 000000000000..060f703659e8
--- /dev/null
+++ b/net/core/net-sysfs.c
@@ -0,0 +1,461 @@
+/*
+ * net-sysfs.c - network device class and attributes
+ *
+ * Copyright (c) 2003 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/config.h>
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <net/sock.h>
+#include <linux/rtnetlink.h>
+#include <linux/wireless.h>
+
+#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
+#define to_net_dev(class) container_of(class, struct net_device, class_dev)
+
+static const char fmt_hex[] = "%#x\n";
+static const char fmt_dec[] = "%d\n";
+static const char fmt_ulong[] = "%lu\n";
+
+static inline int dev_isalive(const struct net_device *dev) 
+{
+        return dev->reg_state == NETREG_REGISTERED;
+}
+
+/* use same locking rules as GIF* ioctl's */
+static ssize_t netdev_show(const struct class_device *cd, char *buf,
+                           ssize_t (*format)(const struct net_device *, char *))
+{
+        struct net_device *net = to_net_dev(cd);
+        ssize_t ret = -EINVAL;
+
+        read_lock(&dev_base_lock);
+        if (dev_isalive(net))
+                ret = (*format)(net, buf);
+        read_unlock(&dev_base_lock);
+
+        return ret;
+}
+
+/* generate a show function for simple field */
+#define NETDEVICE_SHOW(field, format_string)                            \
+static ssize_t format_##field(const struct net_device *net, char *buf)  \
+{                                                                       \
+        return sprintf(buf, format_string, net->field);                 \
+}                                                                       \
+static ssize_t show_##field(struct class_device *cd, char *buf)         \
+{                                                                       \
+        return netdev_show(cd, buf, format_##field);                    \
+}
+
+
+/* use same locking and permission rules as SIF* ioctl's */
+static ssize_t netdev_store(struct class_device *dev,
+                            const char *buf, size_t len,
+                            int (*set)(struct net_device *, unsigned long))
+{
+        struct net_device *net = to_net_dev(dev);
+        char *endp;
+        unsigned long new;
+        int ret = -EINVAL;
+
+        if (!capable(CAP_NET_ADMIN))
+                return -EPERM;
+
+        new = simple_strtoul(buf, &endp, 0);
+        if (endp == buf)
+                goto err;
+
+        rtnl_lock();
+        if (dev_isalive(net)) {
+                if ((ret = (*set)(net, new)) == 0)
+                        ret = len;
+        }
+        rtnl_unlock();
+ err:
+        return ret;
+}
+
+/* generate a read-only network device class attribute */
+#define NETDEVICE_ATTR(field, format_string)                            \
+NETDEVICE_SHOW(field, format_string)                                    \
+static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL)            \
+
+NETDEVICE_ATTR(addr_len, fmt_dec);
+NETDEVICE_ATTR(iflink, fmt_dec);
+NETDEVICE_ATTR(ifindex, fmt_dec);
+NETDEVICE_ATTR(features, fmt_hex);
+NETDEVICE_ATTR(type, fmt_dec);
+
+/* use same locking rules as GIFHWADDR ioctl's */
+static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
+{
+        int i;
+        char *cp = buf;
+
+        for (i = 0; i < len; i++)
+                cp += sprintf(cp, "%02x%c", addr[i],
+                              i == (len - 1) ? '\n' : ':');
+        return cp - buf;
+}
+
+static ssize_t show_address(struct class_device *dev, char *buf)
+{
+        struct net_device *net = to_net_dev(dev);
+        ssize_t ret = -EINVAL;
+
+        read_lock(&dev_base_lock);
+        if (dev_isalive(net))
+            ret = format_addr(buf, net->dev_addr, net->addr_len);
+        read_unlock(&dev_base_lock);
+        return ret;
+}
+
+static ssize_t show_broadcast(struct class_device *dev, char *buf)
+{
+        struct net_device *net = to_net_dev(dev);
+        if (dev_isalive(net))
+                return format_addr(buf, net->broadcast, net->addr_len);
+        return -EINVAL;
+}
+
+static ssize_t show_carrier(struct class_device *dev, char *buf)
+{
+        struct net_device *netdev = to_net_dev(dev);
+        if (netif_running(netdev)) {
+                return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
+        }
+        return -EINVAL;
+}
+
+static CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
+static CLASS_DEVICE_ATTR(broadcast, S_IRUGO, show_broadcast, NULL);
+static CLASS_DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL);
+
+/* read-write attributes */
+NETDEVICE_SHOW(mtu, fmt_dec);
+
+static int change_mtu(struct net_device *net, unsigned long new_mtu)
+{
+        return dev_set_mtu(net, (int) new_mtu);
+}
+
+static ssize_t store_mtu(struct class_device *dev, const char *buf, size_t len)
+{
+        return netdev_store(dev, buf, len, change_mtu);
+}
+
+static CLASS_DEVICE_ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu);
+
+NETDEVICE_SHOW(flags, fmt_hex);
+
+static int change_flags(struct net_device *net, unsigned long new_flags)
+{
+        return dev_change_flags(net, (unsigned) new_flags);
+}
+
+static ssize_t store_flags(struct class_device *dev, const char *buf, size_t len)
+{
+        return netdev_store(dev, buf, len, change_flags);
+}
+
+static CLASS_DEVICE_ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags);
+
+NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
+
+static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
+{
+        net->tx_queue_len = new_len;
+        return 0;
+}
+
+static ssize_t store_tx_queue_len(struct class_device *dev, const char *buf, size_t len)
+{
+        return netdev_store(dev, buf, len, change_tx_queue_len);
+}
+
+static CLASS_DEVICE_ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, 
+                         store_tx_queue_len);
+
+
+static struct class_device_attribute *net_class_attributes[] = {
+        &class_device_attr_ifindex,
+        &class_device_attr_iflink,
+        &class_device_attr_addr_len,
+        &class_device_attr_tx_queue_len,
+        &class_device_attr_features,
+        &class_device_attr_mtu,
+        &class_device_attr_flags,
+        &class_device_attr_type,
+        &class_device_attr_address,
+        &class_device_attr_broadcast,
+        &class_device_attr_carrier,
+        NULL
+};
+
+/* Show a given an attribute in the statistics group */
+static ssize_t netstat_show(const struct class_device *cd, char *buf, 
+                            unsigned long offset)
+{
+        struct net_device *dev = to_net_dev(cd);
+        struct net_device_stats *stats;
+        ssize_t ret = -EINVAL;
+
+        if (offset > sizeof(struct net_device_stats) ||
+            offset % sizeof(unsigned long) != 0)
+                WARN_ON(1);
+
+        read_lock(&dev_base_lock);
+        if (dev_isalive(dev) && dev->get_stats &&
+            (stats = (*dev->get_stats)(dev))) 
+                ret = sprintf(buf, fmt_ulong,
+                              *(unsigned long *)(((u8 *) stats) + offset));
+
+        read_unlock(&dev_base_lock);
+        return ret;
+}
+
+/* generate a read-only statistics attribute */
+#define NETSTAT_ENTRY(name)                                             \
+static ssize_t show_##name(struct class_device *cd, char *buf)          \
+{                                                                       \
+        return netstat_show(cd, buf,                                    \
+                            offsetof(struct net_device_stats, name));   \
+}                                                                       \
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
+
+NETSTAT_ENTRY(rx_packets);
+NETSTAT_ENTRY(tx_packets);
+NETSTAT_ENTRY(rx_bytes);
+NETSTAT_ENTRY(tx_bytes);
+NETSTAT_ENTRY(rx_errors);
+NETSTAT_ENTRY(tx_errors);
+NETSTAT_ENTRY(rx_dropped);
+NETSTAT_ENTRY(tx_dropped);
+NETSTAT_ENTRY(multicast);
+NETSTAT_ENTRY(collisions);
+NETSTAT_ENTRY(rx_length_errors);
+NETSTAT_ENTRY(rx_over_errors);
+NETSTAT_ENTRY(rx_crc_errors);
+NETSTAT_ENTRY(rx_frame_errors);
+NETSTAT_ENTRY(rx_fifo_errors);
+NETSTAT_ENTRY(rx_missed_errors);
+NETSTAT_ENTRY(tx_aborted_errors);
+NETSTAT_ENTRY(tx_carrier_errors);
+NETSTAT_ENTRY(tx_fifo_errors);
+NETSTAT_ENTRY(tx_heartbeat_errors);
+NETSTAT_ENTRY(tx_window_errors);
+NETSTAT_ENTRY(rx_compressed);
+NETSTAT_ENTRY(tx_compressed);
+
+static struct attribute *netstat_attrs[] = {
+        &class_device_attr_rx_packets.attr,
+        &class_device_attr_tx_packets.attr,
+        &class_device_attr_rx_bytes.attr,
+        &class_device_attr_tx_bytes.attr,
+        &class_device_attr_rx_errors.attr,
+        &class_device_attr_tx_errors.attr,
+        &class_device_attr_rx_dropped.attr,
+        &class_device_attr_tx_dropped.attr,
+        &class_device_attr_multicast.attr,
+        &class_device_attr_collisions.attr,
+        &class_device_attr_rx_length_errors.attr,
+        &class_device_attr_rx_over_errors.attr,
+        &class_device_attr_rx_crc_errors.attr,
+        &class_device_attr_rx_frame_errors.attr,
+        &class_device_attr_rx_fifo_errors.attr,
+        &class_device_attr_rx_missed_errors.attr,
+        &class_device_attr_tx_aborted_errors.attr,
+        &class_device_attr_tx_carrier_errors.attr,
+        &class_device_attr_tx_fifo_errors.attr,
+        &class_device_attr_tx_heartbeat_errors.attr,
+        &class_device_attr_tx_window_errors.attr,
+        &class_device_attr_rx_compressed.attr,
+        &class_device_attr_tx_compressed.attr,
+        NULL
+};
+
+
+static struct attribute_group netstat_group = {
+        .name  = "statistics",
+        .attrs  = netstat_attrs,
+};
+
+#ifdef WIRELESS_EXT
+/* helper function that does all the locking etc for wireless stats */
+static ssize_t wireless_show(struct class_device *cd, char *buf,
+                             ssize_t (*format)(const struct iw_statistics *,
+                                               char *))
+{
+        struct net_device *dev = to_net_dev(cd);
+        const struct iw_statistics *iw;
+        ssize_t ret = -EINVAL;
+        
+        read_lock(&dev_base_lock);
+        if (dev_isalive(dev) && dev->get_wireless_stats 
+            && (iw = dev->get_wireless_stats(dev)) != NULL) 
+                ret = (*format)(iw, buf);
+        read_unlock(&dev_base_lock);
+
+        return ret;
+}
+
+/* show function template for wireless fields */
+#define WIRELESS_SHOW(name, field, format_string)                       \
+static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
+{                                                                       \
+        return sprintf(buf, format_string, iw->field);                  \
+}                                                                       \
+static ssize_t show_iw_##name(struct class_device *cd, char *buf)       \
+{                                                                       \
+        return wireless_show(cd, buf, format_iw_##name);                \
+}                                                                       \
+static CLASS_DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
+
+WIRELESS_SHOW(status, status, fmt_hex);
+WIRELESS_SHOW(link, qual.qual, fmt_dec);
+WIRELESS_SHOW(level, qual.level, fmt_dec);
+WIRELESS_SHOW(noise, qual.noise, fmt_dec);
+WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
+WIRELESS_SHOW(crypt, discard.code, fmt_dec);
+WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
+WIRELESS_SHOW(misc, discard.misc, fmt_dec);
+WIRELESS_SHOW(retries, discard.retries, fmt_dec);
+WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
+
+static struct attribute *wireless_attrs[] = {
+        &class_device_attr_status.attr,
+        &class_device_attr_link.attr,
+        &class_device_attr_level.attr,
+        &class_device_attr_noise.attr,
+        &class_device_attr_nwid.attr,
+        &class_device_attr_crypt.attr,
+        &class_device_attr_fragment.attr,
+        &class_device_attr_retries.attr,
+        &class_device_attr_misc.attr,
+        &class_device_attr_beacon.attr,
+        NULL
+};
+
+static struct attribute_group wireless_group = {
+        .name = "wireless",
+        .attrs = wireless_attrs,
+};
+#endif
+
+#ifdef CONFIG_HOTPLUG
+static int netdev_hotplug(struct class_device *cd, char **envp,
+                          int num_envp, char *buf, int size)
+{
+        struct net_device *dev = to_net_dev(cd);
+        int i = 0;
+        int n;
+
+        /* pass interface in env to hotplug. */
+        envp[i++] = buf;
+        n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
+        buf += n;
+        size -= n;
+
+        if ((size <= 0) || (i >= num_envp))
+                return -ENOMEM;
+
+        envp[i] = NULL;
+        return 0;
+}
+#endif
+
+/*
+ *      netdev_release -- destroy and free a dead device. 
+ *      Called when last reference to class_device kobject is gone.
+ */
+static void netdev_release(struct class_device *cd)
+{
+        struct net_device *dev 
+                = container_of(cd, struct net_device, class_dev);
+
+        BUG_ON(dev->reg_state != NETREG_RELEASED);
+
+        kfree((char *)dev - dev->padded);
+}
+
+static struct class net_class = {
+        .name = "net",
+        .release = netdev_release,
+#ifdef CONFIG_HOTPLUG
+        .hotplug = netdev_hotplug,
+#endif
+};
+
+void netdev_unregister_sysfs(struct net_device * net)
+{
+        struct class_device * class_dev = &(net->class_dev);
+
+        if (net->get_stats)
+                sysfs_remove_group(&class_dev->kobj, &netstat_group);
+
+#ifdef WIRELESS_EXT
+        if (net->get_wireless_stats)
+                sysfs_remove_group(&class_dev->kobj, &wireless_group);
+#endif
+        class_device_del(class_dev);
+
+}
+
+/* Create sysfs entries for network device. */
+int netdev_register_sysfs(struct net_device *net)
+{
+        struct class_device *class_dev = &(net->class_dev);
+        int i;
+        struct class_device_attribute *attr;
+        int ret;
+
+        class_dev->class = &net_class;
+        class_dev->class_data = net;
+
+        strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
+        if ((ret = class_device_register(class_dev)))
+                goto out;
+
+        for (i = 0; (attr = net_class_attributes[i]) != NULL; i++) {
+                if ((ret = class_device_create_file(class_dev, attr)))
+                    goto out_unreg;
+        }
+
+
+        if (net->get_stats &&
+            (ret = sysfs_create_group(&class_dev->kobj, &netstat_group)))
+                goto out_unreg; 
+
+#ifdef WIRELESS_EXT
+        if (net->get_wireless_stats &&
+            (ret = sysfs_create_group(&class_dev->kobj, &wireless_group)))
+                goto out_cleanup; 
+
+        return 0;
+out_cleanup:
+        if (net->get_stats)
+                sysfs_remove_group(&class_dev->kobj, &netstat_group);
+#else
+        return 0;
+#endif
+
+out_unreg:
+        printk(KERN_WARNING "%s: sysfs attribute registration failed %d\n",
+               net->name, ret);
+        class_device_unregister(class_dev);
+out:
+        return ret;
+}
+
+int netdev_sysfs_init(void)
+{
+        return class_register(&net_class);
+}