diff options
Diffstat (limited to 'net/core/net-sysfs.c')
| -rw-r--r-- | net/core/net-sysfs.c | 2079 |
1 files changed, 2079 insertions, 0 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c new file mode 100644 index 000000000..8409d4140 --- /dev/null +++ b/net/core/net-sysfs.c @@ -0,0 +1,2079 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net-sysfs.c - network device class and attributes + * + * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org> + */ + +#include <linux/capability.h> +#include <linux/kernel.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/slab.h> +#include <linux/sched/signal.h> +#include <linux/sched/isolation.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 <linux/cpu.h> + +#include "dev.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"; + +/* Caller holds RTNL or dev_base_lock */ +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 *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; +} + +/* 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 sysfs_emit(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; + + 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)) { + ret = (*set)(netdev, new); + if (ret == 0) + ret = len; + } + rtnl_unlock(); + err: + return ret; +} + +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 sysfs_emit(buf, fmt_dec, dev_get_iflink(ndev)); +} +static DEVICE_ATTR_RO(iflink); + +static ssize_t format_name_assign_type(const struct net_device *dev, char *buf) +{ + return sysfs_emit(buf, fmt_dec, dev->name_assign_type); +} + +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; +} +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; +} +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; +} +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); +} + +static ssize_t carrier_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t len) +{ + struct net_device *netdev = to_net_dev(dev); + + /* The check is also done in change_carrier; this helps returning early + * without hitting the trylock/restart in netdev_store. + */ + if (!netdev->netdev_ops->ndo_change_carrier) + return -EOPNOTSUPP; + + return netdev_store(dev, attr, buf, len, change_carrier); +} + +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 sysfs_emit(buf, fmt_dec, !!netif_carrier_ok(netdev)); + + return -EINVAL; +} +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; + + /* The check is also done in __ethtool_get_link_ksettings; this helps + * returning early without hitting the trylock/restart below. + */ + if (!netdev->ethtool_ops->get_link_ksettings) + return ret; + + if (!rtnl_trylock()) + return restart_syscall(); + + if (netif_running(netdev) && netif_device_present(netdev)) { + struct ethtool_link_ksettings cmd; + + if (!__ethtool_get_link_ksettings(netdev, &cmd)) + ret = sysfs_emit(buf, fmt_dec, cmd.base.speed); + } + rtnl_unlock(); + return ret; +} +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; + + /* The check is also done in __ethtool_get_link_ksettings; this helps + * returning early without hitting the trylock/restart below. + */ + if (!netdev->ethtool_ops->get_link_ksettings) + return ret; + + 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 = sysfs_emit(buf, "%s\n", duplex); + } + } + rtnl_unlock(); + return ret; +} +static DEVICE_ATTR_RO(duplex); + +static ssize_t testing_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct net_device *netdev = to_net_dev(dev); + + if (netif_running(netdev)) + return sysfs_emit(buf, fmt_dec, !!netif_testing(netdev)); + + return -EINVAL; +} +static DEVICE_ATTR_RO(testing); + +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 sysfs_emit(buf, fmt_dec, !!netif_dormant(netdev)); + + return -EINVAL; +} +static DEVICE_ATTR_RO(dormant); + +static const char *const operstates[] = { + "unknown", + "notpresent", /* currently unused */ + "down", + "lowerlayerdown", + "testing", + "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 sysfs_emit(buf, "%s\n", operstates[operstate]); +} +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 sysfs_emit(buf, fmt_dec, + atomic_read(&netdev->carrier_up_count) + + atomic_read(&netdev->carrier_down_count)); +} +static DEVICE_ATTR_RO(carrier_changes); + +static ssize_t carrier_up_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct net_device *netdev = to_net_dev(dev); + + return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_up_count)); +} +static DEVICE_ATTR_RO(carrier_up_count); + +static ssize_t carrier_down_count_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct net_device *netdev = to_net_dev(dev); + + return sysfs_emit(buf, fmt_dec, atomic_read(&netdev->carrier_down_count)); +} +static DEVICE_ATTR_RO(carrier_down_count); + +/* read-write attributes */ + +static int change_mtu(struct net_device *dev, unsigned long new_mtu) +{ + return dev_set_mtu(dev, (int)new_mtu); +} + +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); +} +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, NULL); +} + +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); +} +NETDEVICE_SHOW_RW(flags, fmt_hex); + +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, dev_change_tx_queue_len); +} +NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec); + +static int change_gro_flush_timeout(struct net_device *dev, unsigned long val) +{ + WRITE_ONCE(dev->gro_flush_timeout, val); + return 0; +} + +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); +} +NETDEVICE_SHOW_RW(gro_flush_timeout, fmt_ulong); + +static int change_napi_defer_hard_irqs(struct net_device *dev, unsigned long val) +{ + WRITE_ONCE(dev->napi_defer_hard_irqs, val); + return 0; +} + +static ssize_t napi_defer_hard_irqs_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_napi_defer_hard_irqs); +} +NETDEVICE_SHOW_RW(napi_defer_hard_irqs, fmt_dec); + +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 = 0; + + 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(); + + if (dev_isalive(netdev)) { + ret = dev_set_alias(netdev, buf, count); + if (ret < 0) + goto err; + ret = len; + netdev_state_change(netdev); + } +err: + rtnl_unlock(); + + return ret; +} + +static ssize_t ifalias_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + const struct net_device *netdev = to_net_dev(dev); + char tmp[IFALIASZ]; + ssize_t ret = 0; + + ret = dev_get_alias(netdev, tmp, sizeof(tmp)); + if (ret > 0) + ret = sysfs_emit(buf, "%s\n", tmp); + return ret; +} +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; +} + +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); +} +NETDEVICE_SHOW(group, fmt_dec); +static DEVICE_ATTR(netdev_group, 0644, 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); +} + +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); +} +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; + + /* The check is also done in dev_get_phys_port_id; this helps returning + * early without hitting the trylock/restart below. + */ + if (!netdev->netdev_ops->ndo_get_phys_port_id) + return -EOPNOTSUPP; + + 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 = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id); + } + rtnl_unlock(); + + return ret; +} +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; + + /* The checks are also done in dev_get_phys_port_name; this helps + * returning early without hitting the trylock/restart below. + */ + if (!netdev->netdev_ops->ndo_get_phys_port_name && + !netdev->netdev_ops->ndo_get_devlink_port) + return -EOPNOTSUPP; + + 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 = sysfs_emit(buf, "%s\n", name); + } + rtnl_unlock(); + + return ret; +} +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; + + /* The checks are also done in dev_get_phys_port_name; this helps + * returning early without hitting the trylock/restart below. This works + * because recurse is false when calling dev_get_port_parent_id. + */ + if (!netdev->netdev_ops->ndo_get_port_parent_id && + !netdev->netdev_ops->ndo_get_devlink_port) + return -EOPNOTSUPP; + + if (!rtnl_trylock()) + return restart_syscall(); + + if (dev_isalive(netdev)) { + struct netdev_phys_item_id ppid = { }; + + ret = dev_get_port_parent_id(netdev, &ppid, false); + if (!ret) + ret = sysfs_emit(buf, "%*phN\n", ppid.id_len, ppid.id); + } + rtnl_unlock(); + + return ret; +} +static DEVICE_ATTR_RO(phys_switch_id); + +static ssize_t threaded_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)) + ret = sysfs_emit(buf, fmt_dec, netdev->threaded); + + rtnl_unlock(); + return ret; +} + +static int modify_napi_threaded(struct net_device *dev, unsigned long val) +{ + int ret; + + if (list_empty(&dev->napi_list)) + return -EOPNOTSUPP; + + if (val != 0 && val != 1) + return -EOPNOTSUPP; + + ret = dev_set_threaded(dev, val); + + return ret; +} + +static ssize_t threaded_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + return netdev_store(dev, attr, buf, len, modify_napi_threaded); +} +static DEVICE_ATTR_RW(threaded); + +static struct attribute *net_class_attrs[] __ro_after_init = { + &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_testing.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_napi_defer_hard_irqs.attr, + &dev_attr_phys_port_id.attr, + &dev_attr_phys_port_name.attr, + &dev_attr_phys_switch_id.attr, + &dev_attr_proto_down.attr, + &dev_attr_carrier_up_count.attr, + &dev_attr_carrier_down_count.attr, + &dev_attr_threaded.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 = sysfs_emit(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 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[] __ro_after_init = { + &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, + &dev_attr_rx_nohandler.attr, + NULL +}; + +static const struct attribute_group netstat_group = { + .name = "statistics", + .attrs = netstat_attrs, +}; + +static struct attribute *wireless_attrs[] = { + NULL +}; + +static const struct attribute_group wireless_group = { + .name = "wireless", + .attrs = wireless_attrs, +}; + +static bool wireless_group_needed(struct net_device *ndev) +{ +#if IS_ENABLED(CONFIG_CFG80211) + if (ndev->ieee80211_ptr) + return true; +#endif +#if IS_ENABLED(CONFIG_WIRELESS_EXT) + if (ndev->wireless_handlers) + return true; +#endif + return false; +} + +#else /* CONFIG_SYSFS */ +#define net_class_groups NULL +#endif /* CONFIG_SYSFS */ + +#ifdef CONFIG_SYSFS +#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) +{ + const 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, buf); +} + +static ssize_t rx_queue_attr_store(struct kobject *kobj, struct attribute *attr, + const char *buf, size_t count) +{ + const 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, buf, count); +} + +static const struct sysfs_ops rx_queue_sysfs_ops = { + .show = rx_queue_attr_show, + .store = rx_queue_attr_store, +}; + +#ifdef CONFIG_RPS +static ssize_t show_rps_map(struct netdev_rx_queue *queue, char *buf) +{ + struct rps_map *map; + cpumask_var_t mask; + int i, len; + + 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 = sysfs_emit(buf, "%*pb\n", cpumask_pr_args(mask)); + rcu_read_unlock(); + free_cpumask_var(mask); + + return len < PAGE_SIZE ? len : -EINVAL; +} + +static ssize_t store_rps_map(struct netdev_rx_queue *queue, + const char *buf, size_t len) +{ + struct rps_map *old_map, *map; + cpumask_var_t mask; + int err, cpu, i; + static DEFINE_MUTEX(rps_map_mutex); + + 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; + } + + if (!cpumask_empty(mask)) { + cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_DOMAIN)); + cpumask_and(mask, mask, housekeeping_cpumask(HK_TYPE_WQ)); + if (cpumask_empty(mask)) { + free_cpumask_var(mask); + return -EINVAL; + } + } + + 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; + } + + mutex_lock(&rps_map_mutex); + old_map = rcu_dereference_protected(queue->rps_map, + mutex_is_locked(&rps_map_mutex)); + rcu_assign_pointer(queue->rps_map, map); + + if (map) + static_branch_inc(&rps_needed); + if (old_map) + static_branch_dec(&rps_needed); + + mutex_unlock(&rps_map_mutex); + + if (old_map) + kfree_rcu(old_map, rcu); + + free_cpumask_var(mask); + return len; +} + +static ssize_t show_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, + 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 sysfs_emit(buf, "%lu\n", val); +} + +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); + vfree(table); +} + +static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue, + 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) doesn't 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 __ro_after_init + = __ATTR(rps_cpus, 0644, show_rps_map, store_rps_map); + +static struct rx_queue_attribute rps_dev_flow_table_cnt_attribute __ro_after_init + = __ATTR(rps_flow_cnt, 0644, + show_rps_dev_flow_table_cnt, store_rps_dev_flow_table_cnt); +#endif /* CONFIG_RPS */ + +static struct attribute *rx_queue_default_attrs[] __ro_after_init = { +#ifdef CONFIG_RPS + &rps_cpus_attribute.attr, + &rps_dev_flow_table_cnt_attribute.attr, +#endif + NULL +}; +ATTRIBUTE_GROUPS(rx_queue_default); + +static void rx_queue_release(struct kobject *kobj) +{ + struct netdev_rx_queue *queue = to_rx_queue(kobj); +#ifdef CONFIG_RPS + 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); + } +#endif + + memset(kobj, 0, sizeof(*kobj)); + netdev_put(queue->dev, &queue->dev_tracker); +} + +static const void *rx_queue_namespace(struct kobject *kobj) +{ + struct netdev_rx_queue *queue = to_rx_queue(kobj); + struct device *dev = &queue->dev->dev; + const void *ns = NULL; + + if (dev->class && dev->class->ns_type) + ns = dev->class->namespace(dev); + + return ns; +} + +static void rx_queue_get_ownership(struct kobject *kobj, + kuid_t *uid, kgid_t *gid) +{ + const struct net *net = rx_queue_namespace(kobj); + + net_ns_get_ownership(net, uid, gid); +} + +static struct kobj_type rx_queue_ktype __ro_after_init = { + .sysfs_ops = &rx_queue_sysfs_ops, + .release = rx_queue_release, + .default_groups = rx_queue_default_groups, + .namespace = rx_queue_namespace, + .get_ownership = rx_queue_get_ownership, +}; + +static int rx_queue_add_kobject(struct net_device *dev, int index) +{ + struct netdev_rx_queue *queue = dev->_rx + index; + struct kobject *kobj = &queue->kobj; + int error = 0; + + /* Kobject_put later will trigger rx_queue_release call which + * decreases dev refcount: Take that reference here + */ + netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL); + + kobj->kset = dev->queues_kset; + error = kobject_init_and_add(kobj, &rx_queue_ktype, NULL, + "rx-%u", index); + if (error) + goto err; + + if (dev->sysfs_rx_queue_group) { + error = sysfs_create_group(kobj, dev->sysfs_rx_queue_group); + if (error) + goto err; + } + + kobject_uevent(kobj, KOBJ_ADD); + + return error; + +err: + kobject_put(kobj); + return error; +} + +static int rx_queue_change_owner(struct net_device *dev, int index, kuid_t kuid, + kgid_t kgid) +{ + struct netdev_rx_queue *queue = dev->_rx + index; + struct kobject *kobj = &queue->kobj; + int error; + + error = sysfs_change_owner(kobj, kuid, kgid); + if (error) + return error; + + if (dev->sysfs_rx_queue_group) + error = sysfs_group_change_owner( + kobj, dev->sysfs_rx_queue_group, kuid, kgid); + + return error; +} +#endif /* CONFIG_SYSFS */ + +int +net_rx_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) +{ +#ifdef CONFIG_SYSFS + int i; + int error = 0; + +#ifndef CONFIG_RPS + if (!dev->sysfs_rx_queue_group) + return 0; +#endif + for (i = old_num; i < new_num; i++) { + error = rx_queue_add_kobject(dev, i); + if (error) { + new_num = old_num; + break; + } + } + + while (--i >= new_num) { + struct kobject *kobj = &dev->_rx[i].kobj; + + if (!refcount_read(&dev_net(dev)->ns.count)) + kobj->uevent_suppress = 1; + if (dev->sysfs_rx_queue_group) + sysfs_remove_group(kobj, dev->sysfs_rx_queue_group); + kobject_put(kobj); + } + + return error; +#else + return 0; +#endif +} + +static int net_rx_queue_change_owner(struct net_device *dev, int num, + kuid_t kuid, kgid_t kgid) +{ +#ifdef CONFIG_SYSFS + int error = 0; + int i; + +#ifndef CONFIG_RPS + if (!dev->sysfs_rx_queue_group) + return 0; +#endif + for (i = 0; i < num; i++) { + error = rx_queue_change_owner(dev, i, kuid, kgid); + if (error) + break; + } + + 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, char *buf); + ssize_t (*store)(struct netdev_queue *queue, + 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) +{ + const 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, buf); +} + +static ssize_t netdev_queue_attr_store(struct kobject *kobj, + struct attribute *attr, + const char *buf, size_t count) +{ + const 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, buf, count); +} + +static const struct sysfs_ops netdev_queue_sysfs_ops = { + .show = netdev_queue_attr_show, + .store = netdev_queue_attr_store, +}; + +static ssize_t tx_timeout_show(struct netdev_queue *queue, char *buf) +{ + unsigned long trans_timeout = atomic_long_read(&queue->trans_timeout); + + return sysfs_emit(buf, fmt_ulong, trans_timeout); +} + +static unsigned int get_netdev_queue_index(struct netdev_queue *queue) +{ + struct net_device *dev = queue->dev; + unsigned int i; + + i = queue - dev->_tx; + BUG_ON(i >= dev->num_tx_queues); + + return i; +} + +static ssize_t traffic_class_show(struct netdev_queue *queue, + char *buf) +{ + struct net_device *dev = queue->dev; + int num_tc, tc; + int index; + + if (!netif_is_multiqueue(dev)) + return -ENOENT; + + if (!rtnl_trylock()) + return restart_syscall(); + + index = get_netdev_queue_index(queue); + + /* If queue belongs to subordinate dev use its TC mapping */ + dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; + + num_tc = dev->num_tc; + tc = netdev_txq_to_tc(dev, index); + + rtnl_unlock(); + + if (tc < 0) + return -EINVAL; + + /* We can report the traffic class one of two ways: + * Subordinate device traffic classes are reported with the traffic + * class first, and then the subordinate class so for example TC0 on + * subordinate device 2 will be reported as "0-2". If the queue + * belongs to the root device it will be reported with just the + * traffic class, so just "0" for TC 0 for example. + */ + return num_tc < 0 ? sysfs_emit(buf, "%d%d\n", tc, num_tc) : + sysfs_emit(buf, "%d\n", tc); +} + +#ifdef CONFIG_XPS +static ssize_t tx_maxrate_show(struct netdev_queue *queue, + char *buf) +{ + return sysfs_emit(buf, "%lu\n", queue->tx_maxrate); +} + +static ssize_t tx_maxrate_store(struct netdev_queue *queue, + const char *buf, size_t len) +{ + struct net_device *dev = queue->dev; + int err, index = get_netdev_queue_index(queue); + u32 rate = 0; + + if (!capable(CAP_NET_ADMIN)) + return -EPERM; + + /* The check is also done later; this helps returning early without + * hitting the trylock/restart below. + */ + if (!dev->netdev_ops->ndo_set_tx_maxrate) + return -EOPNOTSUPP; + + err = kstrtou32(buf, 10, &rate); + if (err < 0) + return err; + + if (!rtnl_trylock()) + return restart_syscall(); + + err = -EOPNOTSUPP; + if (dev->netdev_ops->ndo_set_tx_maxrate) + err = dev->netdev_ops->ndo_set_tx_maxrate(dev, index, rate); + + rtnl_unlock(); + if (!err) { + queue->tx_maxrate = rate; + return len; + } + return err; +} + +static struct netdev_queue_attribute queue_tx_maxrate __ro_after_init + = __ATTR_RW(tx_maxrate); +#endif + +static struct netdev_queue_attribute queue_trans_timeout __ro_after_init + = __ATTR_RO(tx_timeout); + +static struct netdev_queue_attribute queue_traffic_class __ro_after_init + = __ATTR_RO(traffic_class); + +#ifdef CONFIG_BQL +/* + * Byte queue limits sysfs structures and functions. + */ +static ssize_t bql_show(char *buf, unsigned int value) +{ + return sysfs_emit(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, + char *buf) +{ + struct dql *dql = &queue->dql; + + return sysfs_emit(buf, "%u\n", jiffies_to_msecs(dql->slack_hold_time)); +} + +static ssize_t bql_set_hold_time(struct netdev_queue *queue, + 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 __ro_after_init + = __ATTR(hold_time, 0644, + bql_show_hold_time, bql_set_hold_time); + +static ssize_t bql_show_inflight(struct netdev_queue *queue, + char *buf) +{ + struct dql *dql = &queue->dql; + + return sysfs_emit(buf, "%u\n", dql->num_queued - dql->num_completed); +} + +static struct netdev_queue_attribute bql_inflight_attribute __ro_after_init = + __ATTR(inflight, 0444, bql_show_inflight, NULL); + +#define BQL_ATTR(NAME, FIELD) \ +static ssize_t bql_show_ ## NAME(struct netdev_queue *queue, \ + char *buf) \ +{ \ + return bql_show(buf, queue->dql.FIELD); \ +} \ + \ +static ssize_t bql_set_ ## NAME(struct netdev_queue *queue, \ + const char *buf, size_t len) \ +{ \ + return bql_set(buf, len, &queue->dql.FIELD); \ +} \ + \ +static struct netdev_queue_attribute bql_ ## NAME ## _attribute __ro_after_init \ + = __ATTR(NAME, 0644, \ + 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[] __ro_after_init = { + &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 const struct attribute_group dql_group = { + .name = "byte_queue_limits", + .attrs = dql_attrs, +}; +#endif /* CONFIG_BQL */ + +#ifdef CONFIG_XPS +static ssize_t xps_queue_show(struct net_device *dev, unsigned int index, + int tc, char *buf, enum xps_map_type type) +{ + struct xps_dev_maps *dev_maps; + unsigned long *mask; + unsigned int nr_ids; + int j, len; + + rcu_read_lock(); + dev_maps = rcu_dereference(dev->xps_maps[type]); + + /* Default to nr_cpu_ids/dev->num_rx_queues and do not just return 0 + * when dev_maps hasn't been allocated yet, to be backward compatible. + */ + nr_ids = dev_maps ? dev_maps->nr_ids : + (type == XPS_CPUS ? nr_cpu_ids : dev->num_rx_queues); + + mask = bitmap_zalloc(nr_ids, GFP_NOWAIT); + if (!mask) { + rcu_read_unlock(); + return -ENOMEM; + } + + if (!dev_maps || tc >= dev_maps->num_tc) + goto out_no_maps; + + for (j = 0; j < nr_ids; j++) { + int i, tci = j * dev_maps->num_tc + tc; + struct xps_map *map; + + map = rcu_dereference(dev_maps->attr_map[tci]); + if (!map) + continue; + + for (i = map->len; i--;) { + if (map->queues[i] == index) { + __set_bit(j, mask); + break; + } + } + } +out_no_maps: + rcu_read_unlock(); + + len = bitmap_print_to_pagebuf(false, buf, mask, nr_ids); + bitmap_free(mask); + + return len < PAGE_SIZE ? len : -EINVAL; +} + +static ssize_t xps_cpus_show(struct netdev_queue *queue, char *buf) +{ + struct net_device *dev = queue->dev; + unsigned int index; + int len, tc; + + if (!netif_is_multiqueue(dev)) + return -ENOENT; + + index = get_netdev_queue_index(queue); + + if (!rtnl_trylock()) + return restart_syscall(); + + /* If queue belongs to subordinate dev use its map */ + dev = netdev_get_tx_queue(dev, index)->sb_dev ? : dev; + + tc = netdev_txq_to_tc(dev, index); + if (tc < 0) { + rtnl_unlock(); + return -EINVAL; + } + + /* Make sure the subordinate device can't be freed */ + get_device(&dev->dev); + rtnl_unlock(); + + len = xps_queue_show(dev, index, tc, buf, XPS_CPUS); + + put_device(&dev->dev); + return len; +} + +static ssize_t xps_cpus_store(struct netdev_queue *queue, + const char *buf, size_t len) +{ + struct net_device *dev = queue->dev; + unsigned int index; + cpumask_var_t mask; + int err; + + if (!netif_is_multiqueue(dev)) + return -ENOENT; + + 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; + } + + if (!rtnl_trylock()) { + free_cpumask_var(mask); + return restart_syscall(); + } + + err = netif_set_xps_queue(dev, mask, index); + rtnl_unlock(); + + free_cpumask_var(mask); + + return err ? : len; +} + +static struct netdev_queue_attribute xps_cpus_attribute __ro_after_init + = __ATTR_RW(xps_cpus); + +static ssize_t xps_rxqs_show(struct netdev_queue *queue, char *buf) +{ + struct net_device *dev = queue->dev; + unsigned int index; + int tc; + + index = get_netdev_queue_index(queue); + + if (!rtnl_trylock()) + return restart_syscall(); + + tc = netdev_txq_to_tc(dev, index); + rtnl_unlock(); + if (tc < 0) + return -EINVAL; + + return xps_queue_show(dev, index, tc, buf, XPS_RXQS); +} + +static ssize_t xps_rxqs_store(struct netdev_queue *queue, const char *buf, + size_t len) +{ + struct net_device *dev = queue->dev; + struct net *net = dev_net(dev); + unsigned long *mask; + unsigned int index; + int err; + + if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) + return -EPERM; + + mask = bitmap_zalloc(dev->num_rx_queues, GFP_KERNEL); + if (!mask) + return -ENOMEM; + + index = get_netdev_queue_index(queue); + + err = bitmap_parse(buf, len, mask, dev->num_rx_queues); + if (err) { + bitmap_free(mask); + return err; + } + + if (!rtnl_trylock()) { + bitmap_free(mask); + return restart_syscall(); + } + + cpus_read_lock(); + err = __netif_set_xps_queue(dev, mask, index, XPS_RXQS); + cpus_read_unlock(); + + rtnl_unlock(); + + bitmap_free(mask); + return err ? : len; +} + +static struct netdev_queue_attribute xps_rxqs_attribute __ro_after_init + = __ATTR_RW(xps_rxqs); +#endif /* CONFIG_XPS */ + +static struct attribute *netdev_queue_default_attrs[] __ro_after_init = { + &queue_trans_timeout.attr, + &queue_traffic_class.attr, +#ifdef CONFIG_XPS + &xps_cpus_attribute.attr, + &xps_rxqs_attribute.attr, + &queue_tx_maxrate.attr, +#endif + NULL +}; +ATTRIBUTE_GROUPS(netdev_queue_default); + +static void netdev_queue_release(struct kobject *kobj) +{ + struct netdev_queue *queue = to_netdev_queue(kobj); + + memset(kobj, 0, sizeof(*kobj)); + netdev_put(queue->dev, &queue->dev_tracker); +} + +static const void *netdev_queue_namespace(struct kobject *kobj) +{ + struct netdev_queue *queue = to_netdev_queue(kobj); + struct device *dev = &queue->dev->dev; + const void *ns = NULL; + + if (dev->class && dev->class->ns_type) + ns = dev->class->namespace(dev); + + return ns; +} + +static void netdev_queue_get_ownership(struct kobject *kobj, + kuid_t *uid, kgid_t *gid) +{ + const struct net *net = netdev_queue_namespace(kobj); + + net_ns_get_ownership(net, uid, gid); +} + +static struct kobj_type netdev_queue_ktype __ro_after_init = { + .sysfs_ops = &netdev_queue_sysfs_ops, + .release = netdev_queue_release, + .default_groups = netdev_queue_default_groups, + .namespace = netdev_queue_namespace, + .get_ownership = netdev_queue_get_ownership, +}; + +static int netdev_queue_add_kobject(struct net_device *dev, int index) +{ + struct netdev_queue *queue = dev->_tx + index; + struct kobject *kobj = &queue->kobj; + int error = 0; + + /* Kobject_put later will trigger netdev_queue_release call + * which decreases dev refcount: Take that reference here + */ + netdev_hold(queue->dev, &queue->dev_tracker, GFP_KERNEL); + + kobj->kset = dev->queues_kset; + error = kobject_init_and_add(kobj, &netdev_queue_ktype, NULL, + "tx-%u", index); + if (error) + goto err; + +#ifdef CONFIG_BQL + error = sysfs_create_group(kobj, &dql_group); + if (error) + goto err; +#endif + + kobject_uevent(kobj, KOBJ_ADD); + return 0; + +err: + kobject_put(kobj); + return error; +} + +static int tx_queue_change_owner(struct net_device *ndev, int index, + kuid_t kuid, kgid_t kgid) +{ + struct netdev_queue *queue = ndev->_tx + index; + struct kobject *kobj = &queue->kobj; + int error; + + error = sysfs_change_owner(kobj, kuid, kgid); + if (error) + return error; + +#ifdef CONFIG_BQL + error = sysfs_group_change_owner(kobj, &dql_group, kuid, kgid); +#endif + return error; +} +#endif /* CONFIG_SYSFS */ + +int +netdev_queue_update_kobjects(struct net_device *dev, int old_num, int new_num) +{ +#ifdef CONFIG_SYSFS + int i; + int error = 0; + + /* Tx queue kobjects are allowed to be updated when a device is being + * unregistered, but solely to remove queues from qdiscs. Any path + * adding queues should be fixed. + */ + WARN(dev->reg_state == NETREG_UNREGISTERING && new_num > old_num, + "New queues can't be registered after device unregistration."); + + for (i = old_num; i < new_num; i++) { + error = netdev_queue_add_kobject(dev, i); + if (error) { + new_num = old_num; + break; + } + } + + while (--i >= new_num) { + struct netdev_queue *queue = dev->_tx + i; + + if (!refcount_read(&dev_net(dev)->ns.count)) + queue->kobj.uevent_suppress = 1; +#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 net_tx_queue_change_owner(struct net_device *dev, int num, + kuid_t kuid, kgid_t kgid) +{ +#ifdef CONFIG_SYSFS + int error = 0; + int i; + + for (i = 0; i < num; i++) { + error = tx_queue_change_owner(dev, i, kuid, kgid); + if (error) + break; + } + + return error; +#else + return 0; +#endif /* CONFIG_SYSFS */ +} + +static int register_queue_kobjects(struct net_device *dev) +{ + int error = 0, txq = 0, rxq = 0, real_rx = 0, real_tx = 0; + +#ifdef CONFIG_SYSFS + dev->queues_kset = kset_create_and_add("queues", + NULL, &dev->dev.kobj); + if (!dev->queues_kset) + return -ENOMEM; + real_rx = dev->real_num_rx_queues; +#endif + real_tx = dev->real_num_tx_queues; + + error = net_rx_queue_update_kobjects(dev, 0, real_rx); + if (error) + goto error; + rxq = real_rx; + + error = netdev_queue_update_kobjects(dev, 0, real_tx); + if (error) + goto error; + txq = real_tx; + + return 0; + +error: + netdev_queue_update_kobjects(dev, txq, 0); + net_rx_queue_update_kobjects(dev, rxq, 0); +#ifdef CONFIG_SYSFS + kset_unregister(dev->queues_kset); +#endif + return error; +} + +static int queue_change_owner(struct net_device *ndev, kuid_t kuid, kgid_t kgid) +{ + int error = 0, real_rx = 0, real_tx = 0; + +#ifdef CONFIG_SYSFS + if (ndev->queues_kset) { + error = sysfs_change_owner(&ndev->queues_kset->kobj, kuid, kgid); + if (error) + return error; + } + real_rx = ndev->real_num_rx_queues; +#endif + real_tx = ndev->real_num_tx_queues; + + error = net_rx_queue_change_owner(ndev, real_rx, kuid, kgid); + if (error) + return error; + + error = net_tx_queue_change_owner(ndev, real_tx, kuid, kgid); + if (error) + return error; + + return 0; +} + +static void remove_queue_kobjects(struct net_device *dev) +{ + int real_rx = 0, real_tx = 0; + +#ifdef CONFIG_SYSFS + real_rx = dev->real_num_rx_queues; +#endif + real_tx = dev->real_num_tx_queues; + + net_rx_queue_update_kobjects(dev, real_rx, 0); + netdev_queue_update_kobjects(dev, real_tx, 0); + + dev->real_num_rx_queues = 0; + dev->real_num_tx_queues = 0; +#ifdef CONFIG_SYSFS + kset_unregister(dev->queues_kset); +#endif +} + +static bool net_current_may_mount(void) +{ + struct net *net = current->nsproxy->net_ns; + + return ns_capable(net->user_ns, CAP_SYS_ADMIN); +} + +static void *net_grab_current_ns(void) +{ + struct net *ns = current->nsproxy->net_ns; +#ifdef CONFIG_NET_NS + if (ns) + refcount_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); +} + +const struct kobj_ns_type_operations net_ns_type_operations = { + .type = KOBJ_NS_TYPE_NET, + .current_may_mount = net_current_may_mount, + .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); + +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; +} + +/* + * 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); + + /* no need to wait for rcu grace period: + * device is dead and about to be freed. + */ + kfree(rcu_access_pointer(dev->ifalias)); + netdev_freemem(dev); +} + +static const void *net_namespace(struct device *d) +{ + struct net_device *dev = to_net_dev(d); + + return dev_net(dev); +} + +static void net_get_ownership(struct device *d, kuid_t *uid, kgid_t *gid) +{ + struct net_device *dev = to_net_dev(d); + const struct net *net = dev_net(dev); + + net_ns_get_ownership(net, uid, gid); +} + +static struct class net_class __ro_after_init = { + .name = "net", + .dev_release = netdev_release, + .dev_groups = net_class_groups, + .dev_uevent = netdev_uevent, + .ns_type = &net_ns_type_operations, + .namespace = net_namespace, + .get_ownership = net_get_ownership, +}; + +#ifdef CONFIG_OF +static int of_dev_node_match(struct device *dev, const void *data) +{ + for (; dev; dev = dev->parent) { + if (dev->of_node == data) + return 1; + } + + return 0; +} + +/* + * of_find_net_device_by_node - lookup the net device for the device node + * @np: OF device node + * + * Looks up the net_device structure corresponding with the device node. + * If successful, returns a pointer to the net_device with the embedded + * struct device refcount incremented by one, or NULL on failure. The + * refcount must be dropped when done with the net_device. + */ +struct net_device *of_find_net_device_by_node(struct device_node *np) +{ + struct device *dev; + + dev = class_find_device(&net_class, NULL, np, of_dev_node_match); + if (!dev) + return NULL; + + return to_net_dev(dev); +} +EXPORT_SYMBOL(of_find_net_device_by_node); +#endif + +/* Delete sysfs entries but hold kobject reference until after all + * netdev references are gone. + */ +void netdev_unregister_kobject(struct net_device *ndev) +{ + struct device *dev = &ndev->dev; + + if (!refcount_read(&dev_net(ndev)->ns.count)) + dev_set_uevent_suppress(dev, 1); + + kobject_get(&dev->kobj); + + remove_queue_kobjects(ndev); + + pm_runtime_set_memalloc_noio(dev, false); + + device_del(dev); +} + +/* Create sysfs entries for network device. */ +int netdev_register_kobject(struct net_device *ndev) +{ + struct device *dev = &ndev->dev; + const struct attribute_group **groups = ndev->sysfs_groups; + int error = 0; + + device_initialize(dev); + dev->class = &net_class; + dev->platform_data = ndev; + dev->groups = groups; + + dev_set_name(dev, "%s", ndev->name); + +#ifdef CONFIG_SYSFS + /* Allow for a device specific group */ + if (*groups) + groups++; + + *groups++ = &netstat_group; + + if (wireless_group_needed(ndev)) + *groups++ = &wireless_group; +#endif /* CONFIG_SYSFS */ + + error = device_add(dev); + if (error) + return error; + + error = register_queue_kobjects(ndev); + if (error) { + device_del(dev); + return error; + } + + pm_runtime_set_memalloc_noio(dev, true); + + return error; +} + +/* Change owner for sysfs entries when moving network devices across network + * namespaces owned by different user namespaces. + */ +int netdev_change_owner(struct net_device *ndev, const struct net *net_old, + const struct net *net_new) +{ + kuid_t old_uid = GLOBAL_ROOT_UID, new_uid = GLOBAL_ROOT_UID; + kgid_t old_gid = GLOBAL_ROOT_GID, new_gid = GLOBAL_ROOT_GID; + struct device *dev = &ndev->dev; + int error; + + net_ns_get_ownership(net_old, &old_uid, &old_gid); + net_ns_get_ownership(net_new, &new_uid, &new_gid); + + /* The network namespace was changed but the owning user namespace is + * identical so there's no need to change the owner of sysfs entries. + */ + if (uid_eq(old_uid, new_uid) && gid_eq(old_gid, new_gid)) + return 0; + + error = device_change_owner(dev, new_uid, new_gid); + if (error) + return error; + + error = queue_change_owner(ndev, new_uid, new_gid); + if (error) + return error; + + return 0; +} + +int netdev_class_create_file_ns(const struct class_attribute *class_attr, + const void *ns) +{ + return class_create_file_ns(&net_class, class_attr, ns); +} +EXPORT_SYMBOL(netdev_class_create_file_ns); + +void netdev_class_remove_file_ns(const struct class_attribute *class_attr, + const void *ns) +{ + class_remove_file_ns(&net_class, class_attr, ns); +} +EXPORT_SYMBOL(netdev_class_remove_file_ns); + +int __init netdev_kobject_init(void) +{ + kobj_ns_type_register(&net_ns_type_operations); + return class_register(&net_class); +} |