linux/net/core/net-sysfs.c
Eric W. Biederman 5e1fccc0bf net: Allow userns root control of the core of the network stack.
Allow an unpriviled user who has created a user namespace, and then
created a network namespace to effectively use the new network
namespace, by reducing capable(CAP_NET_ADMIN) and
capable(CAP_NET_RAW) calls to be ns_capable(net->user_ns,
CAP_NET_ADMIN), or capable(net->user_ns, CAP_NET_RAW) calls.

Settings that merely control a single network device are allowed.
Either the network device is a logical network device where
restrictions make no difference or the network device is hardware NIC
that has been explicity moved from the initial network namespace.

In general policy and network stack state changes are allowed
while resource control is left unchanged.

Allow ethtool ioctls.

Allow binding to network devices.
Allow setting the socket mark.
Allow setting the socket priority.

Allow setting the network device alias via sysfs.
Allow setting the mtu via sysfs.
Allow changing the network device flags via sysfs.
Allow setting the network device group via sysfs.

Allow the following network device ioctls.
SIOCGMIIPHY
SIOCGMIIREG
SIOCSIFNAME
SIOCSIFFLAGS
SIOCSIFMETRIC
SIOCSIFMTU
SIOCSIFHWADDR
SIOCSIFSLAVE
SIOCADDMULTI
SIOCDELMULTI
SIOCSIFHWBROADCAST
SIOCSMIIREG
SIOCBONDENSLAVE
SIOCBONDRELEASE
SIOCBONDSETHWADDR
SIOCBONDCHANGEACTIVE
SIOCBRADDIF
SIOCBRDELIF
SIOCSHWTSTAMP

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-11-18 20:32:45 -05:00

1449 lines
34 KiB
C

/*
* 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 <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/wireless.h>
#include <linux/vmalloc.h>
#include <linux/export.h>
#include <linux/jiffies.h>
#include <net/wext.h>
#include "net-sysfs.h"
#ifdef CONFIG_SYSFS
static const char fmt_hex[] = "%#x\n";
static const char fmt_long_hex[] = "%#lx\n";
static const char fmt_dec[] = "%d\n";
static const char fmt_udec[] = "%u\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;
}
/* 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 *net = to_net_dev(dev);
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 device *dev, \
struct device_attribute *attr, char *buf) \
{ \
return netdev_show(dev, attr, buf, format_##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;
}
NETDEVICE_SHOW(dev_id, fmt_hex);
NETDEVICE_SHOW(addr_assign_type, fmt_dec);
NETDEVICE_SHOW(addr_len, fmt_dec);
NETDEVICE_SHOW(iflink, fmt_dec);
NETDEVICE_SHOW(ifindex, fmt_dec);
NETDEVICE_SHOW(type, fmt_dec);
NETDEVICE_SHOW(link_mode, fmt_dec);
/* use same locking rules as GIFHWADDR ioctl's */
static ssize_t show_address(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *net = to_net_dev(dev);
ssize_t ret = -EINVAL;
read_lock(&dev_base_lock);
if (dev_isalive(net))
ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
read_unlock(&dev_base_lock);
return ret;
}
static ssize_t show_broadcast(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct net_device *net = to_net_dev(dev);
if (dev_isalive(net))
return sysfs_format_mac(buf, net->broadcast, net->addr_len);
return -EINVAL;
}
static ssize_t show_carrier(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;
}
static ssize_t show_speed(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_cmd cmd;
if (!__ethtool_get_settings(netdev, &cmd))
ret = sprintf(buf, fmt_udec, ethtool_cmd_speed(&cmd));
}
rtnl_unlock();
return ret;
}
static ssize_t show_duplex(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_cmd cmd;
if (!__ethtool_get_settings(netdev, &cmd)) {
const char *duplex;
switch (cmd.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;
}
static ssize_t show_dormant(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;
}
static const char *const operstates[] = {
"unknown",
"notpresent", /* currently unused */
"down",
"lowerlayerdown",
"testing", /* currently unused */
"dormant",
"up"
};
static ssize_t show_operstate(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]);
}
/* 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 device *dev, struct device_attribute *attr,
const char *buf, size_t len)
{
return netdev_store(dev, attr, buf, len, change_mtu);
}
NETDEVICE_SHOW(flags, fmt_hex);
static int change_flags(struct net_device *net, unsigned long new_flags)
{
return dev_change_flags(net, (unsigned int) new_flags);
}
static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
const char *buf, size_t len)
{
return netdev_store(dev, attr, buf, len, change_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 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);
}
static ssize_t store_ifalias(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;
}
static ssize_t show_ifalias(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;
}
NETDEVICE_SHOW(group, fmt_dec);
static int change_group(struct net_device *net, unsigned long new_group)
{
dev_set_group(net, (int) new_group);
return 0;
}
static ssize_t store_group(struct device *dev, struct device_attribute *attr,
const char *buf, size_t len)
{
return netdev_store(dev, attr, buf, len, change_group);
}
static struct device_attribute net_class_attributes[] = {
__ATTR(addr_assign_type, S_IRUGO, show_addr_assign_type, NULL),
__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
__ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
__ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
__ATTR(iflink, S_IRUGO, show_iflink, NULL),
__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
__ATTR(type, S_IRUGO, show_type, NULL),
__ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
__ATTR(address, S_IRUGO, show_address, NULL),
__ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
__ATTR(carrier, S_IRUGO, show_carrier, NULL),
__ATTR(speed, S_IRUGO, show_speed, NULL),
__ATTR(duplex, S_IRUGO, show_duplex, NULL),
__ATTR(dormant, S_IRUGO, show_dormant, NULL),
__ATTR(operstate, S_IRUGO, show_operstate, NULL),
__ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
__ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
store_tx_queue_len),
__ATTR(netdev_group, S_IRUGO | S_IWUSR, show_group, store_group),
{}
};
/* 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;
}
/* generate a read-only statistics attribute */
#define NETSTAT_ENTRY(name) \
static ssize_t show_##name(struct device *d, \
struct device_attribute *attr, char *buf) \
{ \
return netstat_show(d, attr, buf, \
offsetof(struct rtnl_link_stats64, name)); \
} \
static 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[] = {
&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,
&dev_attr_rx_over_errors.attr,
&dev_attr_rx_crc_errors.attr,
&dev_attr_rx_frame_errors.attr,
&dev_attr_rx_fifo_errors.attr,
&dev_attr_rx_missed_errors.attr,
&dev_attr_tx_aborted_errors.attr,
&dev_attr_tx_carrier_errors.attr,
&dev_attr_tx_fifo_errors.attr,
&dev_attr_tx_heartbeat_errors.attr,
&dev_attr_tx_window_errors.attr,
&dev_attr_rx_compressed.attr,
&dev_attr_tx_compressed.attr,
NULL
};
static struct attribute_group netstat_group = {
.name = "statistics",
.attrs = netstat_attrs,
};
#endif /* CONFIG_SYSFS */
#ifdef CONFIG_RPS
/*
* RX queue sysfs structures and functions.
*/
struct rx_queue_attribute {
struct attribute attr;
ssize_t (*show)(struct netdev_rx_queue *queue,
struct rx_queue_attribute *attr, char *buf);
ssize_t (*store)(struct netdev_rx_queue *queue,
struct rx_queue_attribute *attr, const char *buf, size_t len);
};
#define to_rx_queue_attr(_attr) container_of(_attr, \
struct rx_queue_attribute, attr)
#define to_rx_queue(obj) container_of(obj, struct netdev_rx_queue, kobj)
static ssize_t rx_queue_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
struct netdev_rx_queue *queue = to_rx_queue(kobj);
if (!attribute->show)
return -EIO;
return attribute->show(queue, attribute, buf);
}
static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
struct rx_queue_attribute *attribute = to_rx_queue_attr(attr);
struct netdev_rx_queue *queue = to_rx_queue(kobj);
if (!attribute->store)
return -EIO;
return attribute->store(queue, attribute, buf, count);
}
static const struct sysfs_ops rx_queue_sysfs_ops = {
.show = rx_queue_attr_show,
.store = rx_queue_attr_store,
};
static ssize_t show_rps_map(struct netdev_rx_queue *queue,
struct rx_queue_attribute *attribute, char *buf)
{
struct rps_map *map;
cpumask_var_t mask;
size_t len = 0;
int i;
if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
rcu_read_lock();
map = rcu_dereference(queue->rps_map);
if (map)
for (i = 0; i < map->len; i++)
cpumask_set_cpu(map->cpus[i], mask);
len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
if (PAGE_SIZE - len < 3) {
rcu_read_unlock();
free_cpumask_var(mask);
return -EINVAL;
}
rcu_read_unlock();
free_cpumask_var(mask);
len += sprintf(buf + len, "\n");
return len;
}
static ssize_t store_rps_map(struct netdev_rx_queue *queue,
struct rx_queue_attribute *attribute,
const char *buf, size_t len)
{
struct rps_map *old_map, *map;
cpumask_var_t mask;
int err, cpu, i;
static DEFINE_SPINLOCK(rps_map_lock);
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
if (err) {
free_cpumask_var(mask);
return err;
}
map = kzalloc(max_t(unsigned int,
RPS_MAP_SIZE(cpumask_weight(mask)), L1_CACHE_BYTES),
GFP_KERNEL);
if (!map) {
free_cpumask_var(mask);
return -ENOMEM;
}
i = 0;
for_each_cpu_and(cpu, mask, cpu_online_mask)
map->cpus[i++] = cpu;
if (i)
map->len = i;
else {
kfree(map);
map = NULL;
}
spin_lock(&rps_map_lock);
old_map = rcu_dereference_protected(queue->rps_map,
lockdep_is_held(&rps_map_lock));
rcu_assign_pointer(queue->rps_map, map);
spin_unlock(&rps_map_lock);
if (map)
static_key_slow_inc(&rps_needed);
if (old_map) {
kfree_rcu(old_map, rcu);
static_key_slow_dec(&rps_needed);
}
free_cpumask_var(mask);
return len;
}
static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
struct rx_queue_attribute *attr,
char *buf)
{
struct rps_dev_flow_table *flow_table;
unsigned long val = 0;
rcu_read_lock();
flow_table = rcu_dereference(queue->rps_flow_table);
if (flow_table)
val = (unsigned long)flow_table->mask + 1;
rcu_read_unlock();
return sprintf(buf, "%lu\n", val);
}
static void rps_dev_flow_table_release_work(struct work_struct *work)
{
struct rps_dev_flow_table *table = container_of(work,
struct rps_dev_flow_table, free_work);
vfree(table);
}
static void rps_dev_flow_table_release(struct rcu_head *rcu)
{
struct rps_dev_flow_table *table = container_of(rcu,
struct rps_dev_flow_table, rcu);
INIT_WORK(&table->free_work, rps_dev_flow_table_release_work);
schedule_work(&table->free_work);
}
static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
struct rx_queue_attribute *attr,
const char *buf, size_t len)
{
unsigned long mask, count;
struct rps_dev_flow_table *table, *old_table;
static DEFINE_SPINLOCK(rps_dev_flow_lock);
int rc;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
rc = kstrtoul(buf, 0, &count);
if (rc < 0)
return rc;
if (count) {
mask = count - 1;
/* mask = roundup_pow_of_two(count) - 1;
* without overflows...
*/
while ((mask | (mask >> 1)) != mask)
mask |= (mask >> 1);
/* On 64 bit arches, must check mask fits in table->mask (u32),
* and on 32bit arches, must check RPS_DEV_FLOW_TABLE_SIZE(mask + 1)
* doesnt overflow.
*/
#if BITS_PER_LONG > 32
if (mask > (unsigned long)(u32)mask)
return -EINVAL;
#else
if (mask > (ULONG_MAX - RPS_DEV_FLOW_TABLE_SIZE(1))
/ sizeof(struct rps_dev_flow)) {
/* Enforce a limit to prevent overflow */
return -EINVAL;
}
#endif
table = vmalloc(RPS_DEV_FLOW_TABLE_SIZE(mask + 1));
if (!table)
return -ENOMEM;
table->mask = mask;
for (count = 0; count <= mask; count++)
table->flows[count].cpu = RPS_NO_CPU;
} else
table = NULL;
spin_lock(&rps_dev_flow_lock);
old_table = rcu_dereference_protected(queue->rps_flow_table,
lockdep_is_held(&rps_dev_flow_lock));
rcu_assign_pointer(queue->rps_flow_table, table);
spin_unlock(&rps_dev_flow_lock);
if (old_table)
call_rcu(&old_table->rcu, rps_dev_flow_table_release);
return len;
}
static struct rx_queue_attribute rps_cpus_attribute =
__ATTR(rps_cpus, S_IRUGO | S_IWUSR, show_rps_map, store_rps_map);
static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute =
__ATTR(rps_flow_cnt, S_IRUGO | S_IWUSR,
show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt);
static struct attribute *rx_queue_default_attrs[] = {
&rps_cpus_attribute.attr,
&rps_dev_flow_table_cnt_attribute.attr,
NULL
};
static void rx_queue_release(struct kobject *kobj)
{
struct netdev_rx_queue *queue = to_rx_queue(kobj);
struct rps_map *map;
struct rps_dev_flow_table *flow_table;
map = rcu_dereference_protected(queue->rps_map, 1);
if (map) {
RCU_INIT_POINTER(queue->rps_map, NULL);
kfree_rcu(map, rcu);
}
flow_table = rcu_dereference_protected(queue->rps_flow_table, 1);
if (flow_table) {
RCU_INIT_POINTER(queue->rps_flow_table, NULL);
call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
}
memset(kobj, 0, sizeof(*kobj));
dev_put(queue->dev);
}
static struct kobj_type rx_queue_ktype = {
.sysfs_ops = &rx_queue_sysfs_ops,
.release = rx_queue_release,
.default_attrs = rx_queue_default_attrs,
};
static int rx_queue_add_kobject(struct net_device *net, int index)
{
struct netdev_rx_queue *queue = net->_rx + index;
struct kobject *kobj = &queue->kobj;
int error = 0;
kobj->kset = net->queues_kset;
error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL,
"rx-%u", index);
if (error) {
kobject_put(kobj);
return error;
}
kobject_uevent(kobj, KOBJ_ADD);
dev_hold(queue->dev);
return error;
}
#endif /* CONFIG_RPS */
int
net_rx_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
{
#ifdef CONFIG_RPS
int i;
int error = 0;
for (i = old_num; i < new_num; i++) {
error = rx_queue_add_kobject(net, i);
if (error) {
new_num = old_num;
break;
}
}
while (--i >= new_num)
kobject_put(&net->_rx[i].kobj);
return error;
#else
return 0;
#endif
}
#ifdef CONFIG_SYSFS
/*
* netdev_queue sysfs structures and functions.
*/
struct netdev_queue_attribute {
struct attribute attr;
ssize_t (*show)(struct netdev_queue *queue,
struct netdev_queue_attribute *attr, char *buf);
ssize_t (*store)(struct netdev_queue *queue,
struct netdev_queue_attribute *attr, const char *buf, size_t len);
};
#define to_netdev_queue_attr(_attr) container_of(_attr, \
struct netdev_queue_attribute, attr)
#define to_netdev_queue(obj) container_of(obj, struct netdev_queue, kobj)
static ssize_t netdev_queue_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
struct netdev_queue *queue = to_netdev_queue(kobj);
if (!attribute->show)
return -EIO;
return attribute->show(queue, attribute, buf);
}
static ssize_t netdev_queue_attr_store(struct kobject *kobj,
struct attribute *attr,
const char *buf, size_t count)
{
struct netdev_queue_attribute *attribute = to_netdev_queue_attr(attr);
struct netdev_queue *queue = to_netdev_queue(kobj);
if (!attribute->store)
return -EIO;
return attribute->store(queue, attribute, buf, count);
}
static const struct sysfs_ops netdev_queue_sysfs_ops = {
.show = netdev_queue_attr_show,
.store = netdev_queue_attr_store,
};
static ssize_t show_trans_timeout(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
char *buf)
{
unsigned long trans_timeout;
spin_lock_irq(&queue->_xmit_lock);
trans_timeout = queue->trans_timeout;
spin_unlock_irq(&queue->_xmit_lock);
return sprintf(buf, "%lu", trans_timeout);
}
static struct netdev_queue_attribute queue_trans_timeout =
__ATTR(tx_timeout, S_IRUGO, show_trans_timeout, NULL);
#ifdef CONFIG_BQL
/*
* Byte queue limits sysfs structures and functions.
*/
static ssize_t bql_show(char *buf, unsigned int value)
{
return sprintf(buf, "%u\n", value);
}
static ssize_t bql_set(const char *buf, const size_t count,
unsigned int *pvalue)
{
unsigned int value;
int err;
if (!strcmp(buf, "max") || !strcmp(buf, "max\n"))
value = DQL_MAX_LIMIT;
else {
err = kstrtouint(buf, 10, &value);
if (err < 0)
return err;
if (value > DQL_MAX_LIMIT)
return -EINVAL;
}
*pvalue = value;
return count;
}
static ssize_t bql_show_hold_time(struct netdev_queue *queue,
struct netdev_queue_attribute *attr,
char *buf)
{
struct dql *dql = &queue->dql;
return sprintf(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time));
}
static ssize_t bql_set_hold_time(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
const char *buf, size_t len)
{
struct dql *dql = &queue->dql;
unsigned int value;
int err;
err = kstrtouint(buf, 10, &value);
if (err < 0)
return err;
dql->slack_hold_time = msecs_to_jiffies(value);
return len;
}
static struct netdev_queue_attribute bql_hold_time_attribute =
__ATTR(hold_time, S_IRUGO | S_IWUSR, bql_show_hold_time,
bql_set_hold_time);
static ssize_t bql_show_inflight(struct netdev_queue *queue,
struct netdev_queue_attribute *attr,
char *buf)
{
struct dql *dql = &queue->dql;
return sprintf(buf, "%u\n", dql->num_queued - dql->num_completed);
}
static struct netdev_queue_attribute bql_inflight_attribute =
__ATTR(inflight, S_IRUGO, bql_show_inflight, NULL);
#define BQL_ATTR(NAME, FIELD) \
static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \
struct netdev_queue_attribute *attr, \
char *buf) \
{ \
return bql_show(buf, queue->dql.FIELD); \
} \
\
static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \
struct netdev_queue_attribute *attr, \
const char *buf, size_t len) \
{ \
return bql_set(buf, len, &queue->dql.FIELD); \
} \
\
static struct netdev_queue_attribute bql_ ## NAME ## _attribute = \
__ATTR(NAME, S_IRUGO | S_IWUSR, bql_show_ ## NAME, \
bql_set_ ## NAME);
BQL_ATTR(limit, limit)
BQL_ATTR(limit_max, max_limit)
BQL_ATTR(limit_min, min_limit)
static struct attribute *dql_attrs[] = {
&bql_limit_attribute.attr,
&bql_limit_max_attribute.attr,
&bql_limit_min_attribute.attr,
&bql_hold_time_attribute.attr,
&bql_inflight_attribute.attr,
NULL
};
static struct attribute_group dql_group = {
.name = "byte_queue_limits",
.attrs = dql_attrs,
};
#endif /* CONFIG_BQL */
#ifdef CONFIG_XPS
static inline unsigned int get_netdev_queue_index(struct netdev_queue *queue)
{
struct net_device *dev = queue->dev;
int i;
for (i = 0; i < dev->num_tx_queues; i++)
if (queue == &dev->_tx[i])
break;
BUG_ON(i >= dev->num_tx_queues);
return i;
}
static ssize_t show_xps_map(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute, char *buf)
{
struct net_device *dev = queue->dev;
struct xps_dev_maps *dev_maps;
cpumask_var_t mask;
unsigned long index;
size_t len = 0;
int i;
if (!zalloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
index = get_netdev_queue_index(queue);
rcu_read_lock();
dev_maps = rcu_dereference(dev->xps_maps);
if (dev_maps) {
for_each_possible_cpu(i) {
struct xps_map *map =
rcu_dereference(dev_maps->cpu_map[i]);
if (map) {
int j;
for (j = 0; j < map->len; j++) {
if (map->queues[j] == index) {
cpumask_set_cpu(i, mask);
break;
}
}
}
}
}
rcu_read_unlock();
len += cpumask_scnprintf(buf + len, PAGE_SIZE, mask);
if (PAGE_SIZE - len < 3) {
free_cpumask_var(mask);
return -EINVAL;
}
free_cpumask_var(mask);
len += sprintf(buf + len, "\n");
return len;
}
static DEFINE_MUTEX(xps_map_mutex);
#define xmap_dereference(P) \
rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
static void xps_queue_release(struct netdev_queue *queue)
{
struct net_device *dev = queue->dev;
struct xps_dev_maps *dev_maps;
struct xps_map *map;
unsigned long index;
int i, pos, nonempty = 0;
index = get_netdev_queue_index(queue);
mutex_lock(&xps_map_mutex);
dev_maps = xmap_dereference(dev->xps_maps);
if (dev_maps) {
for_each_possible_cpu(i) {
map = xmap_dereference(dev_maps->cpu_map[i]);
if (!map)
continue;
for (pos = 0; pos < map->len; pos++)
if (map->queues[pos] == index)
break;
if (pos < map->len) {
if (map->len > 1)
map->queues[pos] =
map->queues[--map->len];
else {
RCU_INIT_POINTER(dev_maps->cpu_map[i],
NULL);
kfree_rcu(map, rcu);
map = NULL;
}
}
if (map)
nonempty = 1;
}
if (!nonempty) {
RCU_INIT_POINTER(dev->xps_maps, NULL);
kfree_rcu(dev_maps, rcu);
}
}
mutex_unlock(&xps_map_mutex);
}
static ssize_t store_xps_map(struct netdev_queue *queue,
struct netdev_queue_attribute *attribute,
const char *buf, size_t len)
{
struct net_device *dev = queue->dev;
cpumask_var_t mask;
int err, i, cpu, pos, map_len, alloc_len, need_set;
unsigned long index;
struct xps_map *map, *new_map;
struct xps_dev_maps *dev_maps, *new_dev_maps;
int nonempty = 0;
int numa_node_id = -2;
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (!alloc_cpumask_var(&mask, GFP_KERNEL))
return -ENOMEM;
index = get_netdev_queue_index(queue);
err = bitmap_parse(buf, len, cpumask_bits(mask), nr_cpumask_bits);
if (err) {
free_cpumask_var(mask);
return err;
}
new_dev_maps = kzalloc(max_t(unsigned int,
XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES), GFP_KERNEL);
if (!new_dev_maps) {
free_cpumask_var(mask);
return -ENOMEM;
}
mutex_lock(&xps_map_mutex);
dev_maps = xmap_dereference(dev->xps_maps);
for_each_possible_cpu(cpu) {
map = dev_maps ?
xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
new_map = map;
if (map) {
for (pos = 0; pos < map->len; pos++)
if (map->queues[pos] == index)
break;
map_len = map->len;
alloc_len = map->alloc_len;
} else
pos = map_len = alloc_len = 0;
need_set = cpumask_test_cpu(cpu, mask) && cpu_online(cpu);
#ifdef CONFIG_NUMA
if (need_set) {
if (numa_node_id == -2)
numa_node_id = cpu_to_node(cpu);
else if (numa_node_id != cpu_to_node(cpu))
numa_node_id = -1;
}
#endif
if (need_set && pos >= map_len) {
/* Need to add queue to this CPU's map */
if (map_len >= alloc_len) {
alloc_len = alloc_len ?
2 * alloc_len : XPS_MIN_MAP_ALLOC;
new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len),
GFP_KERNEL,
cpu_to_node(cpu));
if (!new_map)
goto error;
new_map->alloc_len = alloc_len;
for (i = 0; i < map_len; i++)
new_map->queues[i] = map->queues[i];
new_map->len = map_len;
}
new_map->queues[new_map->len++] = index;
} else if (!need_set && pos < map_len) {
/* Need to remove queue from this CPU's map */
if (map_len > 1)
new_map->queues[pos] =
new_map->queues[--new_map->len];
else
new_map = NULL;
}
RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], new_map);
}
/* Cleanup old maps */
for_each_possible_cpu(cpu) {
map = dev_maps ?
xmap_dereference(dev_maps->cpu_map[cpu]) : NULL;
if (map && xmap_dereference(new_dev_maps->cpu_map[cpu]) != map)
kfree_rcu(map, rcu);
if (new_dev_maps->cpu_map[cpu])
nonempty = 1;
}
if (nonempty) {
rcu_assign_pointer(dev->xps_maps, new_dev_maps);
} else {
kfree(new_dev_maps);
RCU_INIT_POINTER(dev->xps_maps, NULL);
}
if (dev_maps)
kfree_rcu(dev_maps, rcu);
netdev_queue_numa_node_write(queue, (numa_node_id >= 0) ? numa_node_id :
NUMA_NO_NODE);
mutex_unlock(&xps_map_mutex);
free_cpumask_var(mask);
return len;
error:
mutex_unlock(&xps_map_mutex);
if (new_dev_maps)
for_each_possible_cpu(i)
kfree(rcu_dereference_protected(
new_dev_maps->cpu_map[i],
1));
kfree(new_dev_maps);
free_cpumask_var(mask);
return -ENOMEM;
}
static struct netdev_queue_attribute xps_cpus_attribute =
__ATTR(xps_cpus, S_IRUGO | S_IWUSR, show_xps_map, store_xps_map);
#endif /* CONFIG_XPS */
static struct attribute *netdev_queue_default_attrs[] = {
&queue_trans_timeout.attr,
#ifdef CONFIG_XPS
&xps_cpus_attribute.attr,
#endif
NULL
};
static void netdev_queue_release(struct kobject *kobj)
{
struct netdev_queue *queue = to_netdev_queue(kobj);
#ifdef CONFIG_XPS
xps_queue_release(queue);
#endif
memset(kobj, 0, sizeof(*kobj));
dev_put(queue->dev);
}
static struct kobj_type netdev_queue_ktype = {
.sysfs_ops = &netdev_queue_sysfs_ops,
.release = netdev_queue_release,
.default_attrs = netdev_queue_default_attrs,
};
static int netdev_queue_add_kobject(struct net_device *net, int index)
{
struct netdev_queue *queue = net->_tx + index;
struct kobject *kobj = &queue->kobj;
int error = 0;
kobj->kset = net->queues_kset;
error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL,
"tx-%u", index);
if (error)
goto exit;
#ifdef CONFIG_BQL
error = sysfs_create_group(kobj, &dql_group);
if (error)
goto exit;
#endif
kobject_uevent(kobj, KOBJ_ADD);
dev_hold(queue->dev);
return 0;
exit:
kobject_put(kobj);
return error;
}
#endif /* CONFIG_SYSFS */
int
netdev_queue_update_kobjects(struct net_device *net, int old_num, int new_num)
{
#ifdef CONFIG_SYSFS
int i;
int error = 0;
for (i = old_num; i < new_num; i++) {
error = netdev_queue_add_kobject(net, i);
if (error) {
new_num = old_num;
break;
}
}
while (--i >= new_num) {
struct netdev_queue *queue = net->_tx + i;
#ifdef CONFIG_BQL
sysfs_remove_group(&queue->kobj, &dql_group);
#endif
kobject_put(&queue->kobj);
}
return error;
#else
return 0;
#endif /* CONFIG_SYSFS */
}
static int register_queue_kobjects(struct net_device *net)
{
int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0;
#ifdef CONFIG_SYSFS
net->queues_kset = kset_create_and_add("queues",
NULL, &net->dev.kobj);
if (!net->queues_kset)
return -ENOMEM;
#endif
#ifdef CONFIG_RPS
real_rx = net->real_num_rx_queues;
#endif
real_tx = net->real_num_tx_queues;
error = net_rx_queue_update_kobjects(net, 0, real_rx);
if (error)
goto error;
rxq = real_rx;
error = netdev_queue_update_kobjects(net, 0, real_tx);
if (error)
goto error;
txq = real_tx;
return 0;
error:
netdev_queue_update_kobjects(net, txq, 0);
net_rx_queue_update_kobjects(net, rxq, 0);
return error;
}
static void remove_queue_kobjects(struct net_device *net)
{
int real_rx = 0, real_tx = 0;
#ifdef CONFIG_RPS
real_rx = net->real_num_rx_queues;
#endif
real_tx = net->real_num_tx_queues;
net_rx_queue_update_kobjects(net, real_rx, 0);
netdev_queue_update_kobjects(net, real_tx, 0);
#ifdef CONFIG_SYSFS
kset_unregister(net->queues_kset);
#endif
}
static void *net_grab_current_ns(void)
{
struct net *ns = current->nsproxy->net_ns;
#ifdef CONFIG_NET_NS
if (ns)
atomic_inc(&ns->passive);
#endif
return ns;
}
static const void *net_initial_ns(void)
{
return &init_net;
}
static const void *net_netlink_ns(struct sock *sk)
{
return sock_net(sk);
}
struct kobj_ns_type_operations net_ns_type_operations = {
.type = KOBJ_NS_TYPE_NET,
.grab_current_ns = net_grab_current_ns,
.netlink_ns = net_netlink_ns,
.initial_ns = net_initial_ns,
.drop_ns = net_drop_ns,
};
EXPORT_SYMBOL_GPL(net_ns_type_operations);
#ifdef CONFIG_HOTPLUG
static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
{
struct net_device *dev = to_net_dev(d);
int retval;
/* pass interface to uevent. */
retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
if (retval)
goto exit;
/* pass ifindex to uevent.
* ifindex is useful as it won't change (interface name may change)
* and is what RtNetlink uses natively. */
retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
exit:
return retval;
}
#endif
/*
* netdev_release -- destroy and free a dead device.
* Called when last reference to device kobject is gone.
*/
static void netdev_release(struct device *d)
{
struct net_device *dev = to_net_dev(d);
BUG_ON(dev->reg_state != NETREG_RELEASED);
kfree(dev->ifalias);
kfree((char *)dev - dev->padded);
}
static const void *net_namespace(struct device *d)
{
struct net_device *dev;
dev = container_of(d, struct net_device, dev);
return dev_net(dev);
}
static struct class net_class = {
.name = "net",
.dev_release = netdev_release,
#ifdef CONFIG_SYSFS
.dev_attrs = net_class_attributes,
#endif /* CONFIG_SYSFS */
#ifdef CONFIG_HOTPLUG
.dev_uevent = netdev_uevent,
#endif
.ns_type = &net_ns_type_operations,
.namespace = net_namespace,
};
/* Delete sysfs entries but hold kobject reference until after all
* netdev references are gone.
*/
void netdev_unregister_kobject(struct net_device * net)
{
struct device *dev = &(net->dev);
kobject_get(&dev->kobj);
remove_queue_kobjects(net);
device_del(dev);
}
/* Create sysfs entries for network device. */
int netdev_register_kobject(struct net_device *net)
{
struct device *dev = &(net->dev);
const struct attribute_group **groups = net->sysfs_groups;
int error = 0;
device_initialize(dev);
dev->class = &net_class;
dev->platform_data = net;
dev->groups = groups;
dev_set_name(dev, "%s", net->name);
#ifdef CONFIG_SYSFS
/* Allow for a device specific group */
if (*groups)
groups++;
*groups++ = &netstat_group;
#endif /* CONFIG_SYSFS */
error = device_add(dev);
if (error)
return error;
error = register_queue_kobjects(net);
if (error) {
device_del(dev);
return error;
}
return error;
}
int netdev_class_create_file(struct class_attribute *class_attr)
{
return class_create_file(&net_class, class_attr);
}
EXPORT_SYMBOL(netdev_class_create_file);
void netdev_class_remove_file(struct class_attribute *class_attr)
{
class_remove_file(&net_class, class_attr);
}
EXPORT_SYMBOL(netdev_class_remove_file);
int netdev_kobject_init(void)
{
kobj_ns_type_register(&net_ns_type_operations);
return class_register(&net_class);
}