cregit-Linux how code gets into the kernel

Release 4.8 net/core/net-sysfs.c

Directory: net/core
/*
 * 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/capability.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <net/switchdev.h>
#include <linux/if_arp.h>
#include <linux/slab.h>
#include <linux/nsproxy.h>
#include <net/sock.h>
#include <net/net_namespace.h>
#include <linux/rtnetlink.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <linux/jiffies.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/of_net.h>

#include "net-sysfs.h"

#ifdef CONFIG_SYSFS

static const char fmt_hex[] = "%#x\n";

static const char fmt_dec[] = "%d\n";

static const char fmt_ulong[] = "%lu\n";

static const char fmt_u64[] = "%llu\n";


static inline int dev_isalive(const struct net_device *dev) { return dev->reg_state <= NETREG_REGISTERED; }

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/* use same locking rules as GIF* ioctl's */
static ssize_t netdev_show(const struct device *dev, struct device_attribute *attr, char *buf, ssize_t (*format)(const struct net_device *, char *)) { struct net_device *ndev = to_net_dev(dev); ssize_t ret = -EINVAL; read_lock(&dev_base_lock); if (dev_isalive(ndev)) ret = (*format)(ndev, buf); read_unlock(&dev_base_lock); return ret; }

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americo wangamerico wang33.49%125.00%
Total86100.00%4100.00%

/* generate a show function for simple field */ #define NETDEVICE_SHOW(field, format_string) \ static ssize_t format_##field(const struct net_device *dev, char *buf) \ { \ return sprintf(buf, format_string, dev->field); \ } \ static ssize_t field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ return netdev_show(dev, attr, buf, format_##field); \ } \ #define NETDEVICE_SHOW_RO(field, format_string) \ NETDEVICE_SHOW(field, format_string); \ static DEVICE_ATTR_RO(field) #define NETDEVICE_SHOW_RW(field, format_string) \ NETDEVICE_SHOW(field, format_string); \ static DEVICE_ATTR_RW(field) /* use same locking and permission rules as SIF* ioctl's */
static ssize_t netdev_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len, int (*set)(struct net_device *, unsigned long)) { struct net_device *netdev = to_net_dev(dev); struct net *net = dev_net(netdev); unsigned long new; int ret = -EINVAL; if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; ret = kstrtoul(buf, 0, &new); if (ret) goto err; if (!rtnl_trylock()) return restart_syscall(); if (dev_isalive(netdev)) { if ((ret = (*set)(netdev, new)) == 0) ret = len; } rtnl_unlock(); err: return ret; }

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eric w. biedermaneric w. biederman2013.16%225.00%
greg kroah-hartmangreg kroah-hartman63.95%112.50%
shuah khanshuah khan63.95%112.50%
Total152100.00%8100.00%

NETDEVICE_SHOW_RO(dev_id, fmt_hex); NETDEVICE_SHOW_RO(dev_port, fmt_dec); NETDEVICE_SHOW_RO(addr_assign_type, fmt_dec); NETDEVICE_SHOW_RO(addr_len, fmt_dec); NETDEVICE_SHOW_RO(ifindex, fmt_dec); NETDEVICE_SHOW_RO(type, fmt_dec); NETDEVICE_SHOW_RO(link_mode, fmt_dec);
static ssize_t iflink_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *ndev = to_net_dev(dev); return sprintf(buf, fmt_dec, dev_get_iflink(ndev)); }

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stefan rompfstefan rompf36.98%150.00%
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static DEVICE_ATTR_RO(iflink);
static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) { return sprintf(buf, fmt_dec, dev->name_assign_type); }

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static ssize_t name_assign_type_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *ndev = to_net_dev(dev); ssize_t ret = -EINVAL; if (ndev->name_assign_type != NET_NAME_UNKNOWN) ret = netdev_show(dev, attr, buf, format_name_assign_type); return ret; }

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tom gundersentom gundersen5896.67%150.00%
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static DEVICE_ATTR_RO(name_assign_type); /* use same locking rules as GIFHWADDR ioctl's */
static ssize_t address_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *ndev = to_net_dev(dev); ssize_t ret = -EINVAL; read_lock(&dev_base_lock); if (dev_isalive(ndev)) ret = sysfs_format_mac(buf, ndev->dev_addr, ndev->addr_len); read_unlock(&dev_base_lock); return ret; }

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stephen hemmingerstephen hemminger6183.56%450.00%
greg kroah-hartmangreg kroah-hartman79.59%225.00%
americo wangamerico wang45.48%112.50%
michael chanmichael chan11.37%112.50%
Total73100.00%8100.00%

static DEVICE_ATTR_RO(address);
static ssize_t broadcast_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *ndev = to_net_dev(dev); if (dev_isalive(ndev)) return sysfs_format_mac(buf, ndev->broadcast, ndev->addr_len); return -EINVAL; }

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stephen hemmingerstephen hemminger4378.18%342.86%
greg kroah-hartmangreg kroah-hartman712.73%228.57%
americo wangamerico wang47.27%114.29%
michael chanmichael chan11.82%114.29%
Total55100.00%7100.00%

static DEVICE_ATTR_RO(broadcast);
static int change_carrier(struct net_device *dev, unsigned long new_carrier) { if (!netif_running(dev)) return -EINVAL; return dev_change_carrier(dev, (bool) new_carrier); }

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static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return netdev_store(dev, attr, buf, len, change_carrier); }

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static ssize_t carrier_show(struct device *dev, struct device_attribute *attr, 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; }

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greg kroah-hartmangreg kroah-hartman712.07%266.67%
Total58100.00%3100.00%

static DEVICE_ATTR_RW(carrier);
static ssize_t speed_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); int ret = -EINVAL; if (!rtnl_trylock()) return restart_syscall(); if (netif_running(netdev)) { struct ethtool_link_ksettings cmd; if (!__ethtool_get_link_ksettings(netdev, &cmd)) ret = sprintf(buf, fmt_dec, cmd.base.speed); } rtnl_unlock(); return ret; }

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andy gospodarekandy gospodarek8391.21%125.00%
david decotignydavid decotigny66.59%125.00%
greg kroah-hartmangreg kroah-hartman11.10%125.00%
alexander steinalexander stein11.10%125.00%
Total91100.00%4100.00%

static DEVICE_ATTR_RO(speed);
static ssize_t duplex_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); int ret = -EINVAL; if (!rtnl_trylock()) return restart_syscall(); if (netif_running(netdev)) { struct ethtool_link_ksettings cmd; if (!__ethtool_get_link_ksettings(netdev, &cmd)) { const char *duplex; switch (cmd.base.duplex) { case DUPLEX_HALF: duplex = "half"; break; case DUPLEX_FULL: duplex = "full"; break; default: duplex = "unknown"; break; } ret = sprintf(buf, "%s\n", duplex); } } rtnl_unlock(); return ret; }

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andy gospodarekandy gospodarek8466.67%125.00%
nikolay aleksandrovnikolay aleksandrov3729.37%125.00%
david decotignydavid decotigny43.17%125.00%
greg kroah-hartmangreg kroah-hartman10.79%125.00%
Total126100.00%4100.00%

static DEVICE_ATTR_RO(duplex);
static ssize_t dormant_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); if (netif_running(netdev)) return sprintf(buf, fmt_dec, !!netif_dormant(netdev)); return -EINVAL; }

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stefan rompfstefan rompf4987.50%133.33%
greg kroah-hartmangreg kroah-hartman712.50%266.67%
Total56100.00%3100.00%

static DEVICE_ATTR_RO(dormant); static const char *const operstates[] = { "unknown", "notpresent", /* currently unused */ "down", "lowerlayerdown", "testing", /* currently unused */ "dormant", "up" };
static ssize_t operstate_show(struct device *dev, struct device_attribute *attr, char *buf) { const struct net_device *netdev = to_net_dev(dev); unsigned char operstate; read_lock(&dev_base_lock); operstate = netdev->operstate; if (!netif_running(netdev)) operstate = IF_OPER_DOWN; read_unlock(&dev_base_lock); if (operstate >= ARRAY_SIZE(operstates)) return -EINVAL; /* should not happen */ return sprintf(buf, "%s\n", operstates[operstate]); }

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adrian bunkadrian bunk11.09%125.00%
Total92100.00%4100.00%

static DEVICE_ATTR_RO(operstate);
static ssize_t carrier_changes_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); return sprintf(buf, fmt_dec, atomic_read(&netdev->carrier_changes)); }

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david decotignydavid decotigny46100.00%1100.00%
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static DEVICE_ATTR_RO(carrier_changes); /* read-write attributes */
static int change_mtu(struct net_device *dev, unsigned long new_mtu) { return dev_set_mtu(dev, (int) new_mtu); }

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stephen hemmingerstephen hemminger2492.31%150.00%
americo wangamerico wang27.69%150.00%
Total26100.00%2100.00%


static ssize_t mtu_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return netdev_store(dev, attr, buf, len, change_mtu); }

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greg kroah-hartmangreg kroah-hartman923.68%250.00%
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NETDEVICE_SHOW_RW(mtu, fmt_dec);
static int change_flags(struct net_device *dev, unsigned long new_flags) { return dev_change_flags(dev, (unsigned int) new_flags); }

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eric dumazeteric dumazet13.70%133.33%
Total27100.00%3100.00%


static ssize_t flags_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return netdev_store(dev, attr, buf, len, change_flags); }

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greg kroah-hartmangreg kroah-hartman923.68%250.00%
Total38100.00%4100.00%

NETDEVICE_SHOW_RW(flags, fmt_hex);
static int change_tx_queue_len(struct net_device *dev, unsigned long new_len) { int res, orig_len = dev->tx_queue_len; if (new_len != orig_len) { dev->tx_queue_len = new_len; res = call_netdevice_notifiers(NETDEV_CHANGE_TX_QUEUE_LEN, dev); res = notifier_to_errno(res); if (res) { netdev_err(dev, "refused to change device tx_queue_len\n"); dev->tx_queue_len = orig_len; return -EFAULT; } } return 0; }

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static ssize_t tx_queue_len_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { if (!capable(CAP_NET_ADMIN)) return -EPERM; return netdev_store(dev, attr, buf, len, change_tx_queue_len); }

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greg kroah-hartmangreg kroah-hartman918.00%250.00%
Total50100.00%4100.00%

NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) { dev->gro_flush_timeout = val; return 0; }

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static ssize_t gro_flush_timeout_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { if (!capable(CAP_NET_ADMIN)) return -EPERM; return netdev_store(dev, attr, buf, len, change_gro_flush_timeout); }

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eric dumazeteric dumazet50100.00%1100.00%
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NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong);
static ssize_t ifalias_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { struct net_device *netdev = to_net_dev(dev); struct net *net = dev_net(netdev); size_t count = len; ssize_t ret; if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) return -EPERM; /* ignore trailing newline */ if (len > 0 && buf[len - 1] == '\n') --count; if (!rtnl_trylock()) return restart_syscall(); ret = dev_set_alias(netdev, buf, count); rtnl_unlock(); return ret < 0 ? ret : len; }

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greg kroah-hartmangreg kroah-hartman10.83%125.00%
Total120100.00%4100.00%


static ssize_t ifalias_show(struct device *dev, struct device_attribute *attr, char *buf) { const struct net_device *netdev = to_net_dev(dev); ssize_t ret = 0; if (!rtnl_trylock()) return restart_syscall(); if (netdev->ifalias) ret = sprintf(buf, "%s\n", netdev->ifalias); rtnl_unlock(); return ret; }

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stephen hemmingerstephen hemminger6185.92%133.33%
eric w. biedermaneric w. biederman912.68%133.33%
greg kroah-hartmangreg kroah-hartman11.41%133.33%
Total71100.00%3100.00%

static DEVICE_ATTR_RW(ifalias);
static int change_group(struct net_device *dev, unsigned long new_group) { dev_set_group(dev, (int) new_group); return 0; }

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dogaru vladdogaru vlad2692.86%150.00%
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Total28100.00%2100.00%


static ssize_t group_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return netdev_store(dev, attr, buf, len, change_group); }

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NETDEVICE_SHOW(group, fmt_dec); static DEVICE_ATTR(netdev_group, S_IRUGO | S_IWUSR, group_show, group_store);
static int change_proto_down(struct net_device *dev, unsigned long proto_down) { return dev_change_proto_down(dev, (bool) proto_down); }

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anuradha karuppiahanuradha karuppiah26100.00%1100.00%
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static ssize_t proto_down_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) { return netdev_store(dev, attr, buf, len, change_proto_down); }

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anuradha karuppiahanuradha karuppiah38100.00%1100.00%
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NETDEVICE_SHOW_RW(proto_down, fmt_dec);
static ssize_t phys_port_id_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); ssize_t ret = -EINVAL; if (!rtnl_trylock()) return restart_syscall(); if (dev_isalive(netdev)) { struct netdev_phys_item_id ppid; ret = dev_get_phys_port_id(netdev, &ppid); if (!ret) ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id); } rtnl_unlock(); return ret; }

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jiri pirkojiri pirko9698.97%266.67%
linus torvaldslinus torvalds11.03%133.33%
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static DEVICE_ATTR_RO(phys_port_id);
static ssize_t phys_port_name_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); ssize_t ret = -EINVAL; if (!rtnl_trylock()) return restart_syscall(); if (dev_isalive(netdev)) { char name[IFNAMSIZ]; ret = dev_get_phys_port_name(netdev, name, sizeof(name)); if (!ret) ret = sprintf(buf, "%s\n", name); } rtnl_unlock(); return ret; }

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david aherndavid ahern97100.00%1100.00%
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static DEVICE_ATTR_RO(phys_port_name);
static ssize_t phys_switch_id_show(struct device *dev, struct device_attribute *attr, char *buf) { struct net_device *netdev = to_net_dev(dev); ssize_t ret = -EINVAL; if (!rtnl_trylock()) return restart_syscall(); if (dev_isalive(netdev)) { struct switchdev_attr attr = { .orig_dev = netdev, .id = SWITCHDEV_ATTR_ID_PORT_PARENT_ID, .flags = SWITCHDEV_F_NO_RECURSE, }; ret = switchdev_port_attr_get(netdev, &attr); if (!ret) ret = sprintf(buf, "%*phN\n", attr.u.ppid.id_len, attr.u.ppid.id); } rtnl_unlock(); return ret; }

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ido schimmelido schimmel54.10%120.00%
Total122100.00%5100.00%

static DEVICE_ATTR_RO(phys_switch_id); static struct attribute *net_class_attrs[] = { &dev_attr_netdev_group.attr, &dev_attr_type.attr, &dev_attr_dev_id.attr, &dev_attr_dev_port.attr, &dev_attr_iflink.attr, &dev_attr_ifindex.attr, &dev_attr_name_assign_type.attr, &dev_attr_addr_assign_type.attr, &dev_attr_addr_len.attr, &dev_attr_link_mode.attr, &dev_attr_address.attr, &dev_attr_broadcast.attr, &dev_attr_speed.attr, &dev_attr_duplex.attr, &dev_attr_dormant.attr, &dev_attr_operstate.attr, &dev_attr_carrier_changes.attr, &dev_attr_ifalias.attr, &dev_attr_carrier.attr, &dev_attr_mtu.attr, &dev_attr_flags.attr, &dev_attr_tx_queue_len.attr, &dev_attr_gro_flush_timeout.attr, &dev_attr_phys_port_id.attr, &dev_attr_phys_port_name.attr, &dev_attr_phys_switch_id.attr, &dev_attr_proto_down.attr, NULL, }; ATTRIBUTE_GROUPS(net_class); /* Show a given an attribute in the statistics group */
static ssize_t netstat_show(const struct device *d, struct device_attribute *attr, char *buf, unsigned long offset) { struct net_device *dev = to_net_dev(d); ssize_t ret = -EINVAL; WARN_ON(offset > sizeof(struct rtnl_link_stats64) || offset % sizeof(u64) != 0); read_lock(&dev_base_lock); if (dev_isalive(dev)) { struct rtnl_link_stats64 temp; const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp); ret = sprintf(buf, fmt_u64, *(u64 *)(((u8 *) stats) + offset)); } read_unlock(&dev_base_lock); return ret; }

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stephen hemmingerstephen hemminger10178.29%337.50%
greg kroah-hartmangreg kroah-hartman86.20%112.50%
ben hutchingsben hutchings86.20%112.50%
eric dumazeteric dumazet75.43%112.50%
pavel emelianovpavel emelianov53.88%225.00%
Total129100.00%8100.00%

/* generate a read-only statistics attribute */ #define NETSTAT_ENTRY(name) \ static ssize_t name##_show(struct device *d, \ struct device_attribute *attr, char *buf) \ { \ return netstat_show(d, attr, buf, \ offsetof(struct rtnl_link_stats64, name)); \ } \ static DEVICE_ATTR_RO(name) 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); NETSTAT_ENTRY(rx_nohandler); static struct attribute *netstat_attrs[] = { &dev_attr_rx_packets.attr, &dev_attr_tx_packets.attr, &dev_attr_rx_bytes.attr, &dev_attr_tx_bytes.attr, &dev_attr_rx_errors.attr, &dev_attr_tx_errors.attr, &dev_attr_rx_dropped.attr, &dev_attr_tx_dropped.attr, &dev_attr_multicast.attr, &dev_attr_collisions.attr, &dev_attr_rx_length_errors.attr