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;
}
/* 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)) {
ret = (*set)(netdev, new);
if (ret == 0)
ret = len;
}
rtnl_unlock();
err:
return ret;
}
static ssize_t brport_store(struct kobject *kobj,
struct attribute *attr,
const char *buf, size_t count)
{
struct brport_attribute *brport_attr = to_brport_attr(attr);
struct net_bridge_port *p = to_brport(kobj);
ssize_t ret = -EINVAL;
char *endp;
unsigned long val;
if (!ns_capable(dev_net(p->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;
val = simple_strtoul(buf, &endp, 0);
if (endp != buf) {
if (!rtnl_trylock())
return restart_syscall();
if (p->dev && p->br && brport_attr->store) {
spin_lock_bh(&p->br->lock);
ret = brport_attr->store(p, val);
spin_unlock_bh(&p->br->lock);
if (!ret) {
br_ifinfo_notify(RTM_NEWLINK, p);
ret = count;
}
}
rtnl_unlock();
}
return ret;
}
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;
}
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;
}
/*
* Common code for storing bridge parameters.
*/
static ssize_t store_bridge_parm(struct device *d,
const char *buf, size_t len,
int (*set)(struct net_bridge *, unsigned long))
{
struct net_bridge *br = to_bridge(d);
char *endp;
unsigned long val;
int err;
if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;
val = simple_strtoul(buf, &endp, 0);
if (endp == buf)
return -EINVAL;
if (!rtnl_trylock())
return restart_syscall();
err = (*set)(br, val);
if (!err)
netdev_state_change(br->dev);
rtnl_unlock();
return err ? err : len;
}
static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
struct attribute *attr, char *buff,
size_t count)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_hard_iface *hard_iface;
int status_tmp = -1;
int ret = count;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface)
return count;
if (buff[count - 1] == '\n')
buff[count - 1] = '\0';
if (strlen(buff) >= IFNAMSIZ) {
pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
buff);
batadv_hardif_free_ref(hard_iface);
return -EINVAL;
}
if (strncmp(buff, "none", 4) == 0)
status_tmp = BATADV_IF_NOT_IN_USE;
else
status_tmp = BATADV_IF_I_WANT_YOU;
if (hard_iface->if_status == status_tmp)
goto out;
if ((hard_iface->soft_iface) &&
(strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
goto out;
if (!rtnl_trylock()) {
ret = -ERESTARTSYS;
goto out;
}
if (status_tmp == BATADV_IF_NOT_IN_USE) {
batadv_hardif_disable_interface(hard_iface);
goto unlock;
}
/* if the interface already is in use */
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
batadv_hardif_disable_interface(hard_iface);
ret = batadv_hardif_enable_interface(hard_iface, buff);
unlock:
rtnl_unlock();
out:
batadv_hardif_free_ref(hard_iface);
return ret;
}
/**
* bond_opt_tryset_rtnl - try to acquire rtnl and call __bond_opt_set
* @bond: target bond device
* @option: option to set
* @buf: value to set it to
*
* This function tries to acquire RTNL without blocking and if successful
* calls __bond_opt_set. It is mainly used for sysfs option manipulation.
*/
int bond_opt_tryset_rtnl(struct bonding *bond, unsigned int option, char *buf)
{
struct bond_opt_value optval;
int ret;
if (!rtnl_trylock())
return restart_syscall();
bond_opt_initstr(&optval, buf);
ret = __bond_opt_set_notify(bond, option, &optval);
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);
ssize_t ret = 0;
if (!rtnl_trylock())
return restart_syscall();
if (netdev->ifalias)
ret = sprintf(buf, "%s\n", netdev->ifalias);
rtnl_unlock();
return ret;
}
int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val)
{
if (!rtnl_trylock())
return restart_syscall();
if (br->vlan_enabled == val)
goto unlock;
br->vlan_enabled = val;
unlock:
rtnl_unlock();
return 0;
}
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;
}
/*
* Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
* down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
* present send GARP packet to network peers with netif_notify_peers().
*/
static void netvsc_link_change(struct work_struct *w)
{
struct net_device_context *ndev_ctx =
container_of(w, struct net_device_context, dwork.work);
struct hv_device *device_obj = ndev_ctx->device_ctx;
struct net_device *net = hv_get_drvdata(device_obj);
struct netvsc_device *net_device;
struct rndis_device *rdev;
struct netvsc_reconfig *event = NULL;
bool notify = false, reschedule = false;
unsigned long flags, next_reconfig, delay;
/* if changes are happening, comeback later */
if (!rtnl_trylock()) {
schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
return;
}
net_device = rtnl_dereference(ndev_ctx->nvdev);
if (!net_device)
goto out_unlock;
rdev = net_device->extension;
next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
if (time_is_after_jiffies(next_reconfig)) {
/* link_watch only sends one notification with current state
* per second, avoid doing reconfig more frequently. Handle
* wrap around.
*/
delay = next_reconfig - jiffies;
delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
schedule_delayed_work(&ndev_ctx->dwork, delay);
goto out_unlock;
}
ndev_ctx->last_reconfig = jiffies;
spin_lock_irqsave(&ndev_ctx->lock, flags);
if (!list_empty(&ndev_ctx->reconfig_events)) {
event = list_first_entry(&ndev_ctx->reconfig_events,
struct netvsc_reconfig, list);
list_del(&event->list);
reschedule = !list_empty(&ndev_ctx->reconfig_events);
}
static ssize_t raw_ip_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
{
struct usbnet *dev = netdev_priv(to_net_dev(d));
struct qmi_wwan_state *info = (void *)&dev->data;
bool enable;
int ret;
if (strtobool(buf, &enable))
return -EINVAL;
/* no change? */
if (enable == (info->flags & QMI_WWAN_FLAG_RAWIP))
return len;
if (!rtnl_trylock())
return restart_syscall();
/* we don't want to modify a running netdev */
if (netif_running(dev->net)) {
netdev_err(dev->net, "Cannot change a running device\n");
ret = -EBUSY;
goto err;
}
/* let other drivers deny the change */
ret = call_netdevice_notifiers(NETDEV_PRE_TYPE_CHANGE, dev->net);
ret = notifier_to_errno(ret);
if (ret) {
netdev_err(dev->net, "Type change was refused\n");
goto err;
}
if (enable)
info->flags |= QMI_WWAN_FLAG_RAWIP;
else
info->flags &= ~QMI_WWAN_FLAG_RAWIP;
qmi_wwan_netdev_setup(dev->net);
call_netdevice_notifiers(NETDEV_POST_TYPE_CHANGE, dev->net);
ret = len;
err:
rtnl_unlock();
return ret;
}
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 netdev_phys_item_id ppid = { };
ret = dev_get_port_parent_id(netdev, &ppid, false);
if (!ret)
ret = sprintf(buf, "%*phN\n", ppid.id_len, ppid.id);
}
rtnl_unlock();
return ret;
}
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;
}
static ssize_t group_addr_store(struct device *d,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct net_bridge *br = to_bridge(d);
u8 new_addr[6];
int i;
if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (sscanf(buf, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&new_addr[0], &new_addr[1], &new_addr[2],
&new_addr[3], &new_addr[4], &new_addr[5]) != 6)
return -EINVAL;
if (!is_link_local_ether_addr(new_addr))
return -EINVAL;
if (new_addr[5] == 1 || /* 802.3x Pause address */
new_addr[5] == 2 || /* 802.3ad Slow protocols */
new_addr[5] == 3) /* 802.1X PAE address */
return -EINVAL;
if (!rtnl_trylock())
return restart_syscall();
spin_lock_bh(&br->lock);
for (i = 0; i < 6; i++)
br->group_addr[i] = new_addr[i];
spin_unlock_bh(&br->lock);
br->group_addr_set = true;
br_recalculate_fwd_mask(br);
netdev_state_change(br->dev);
rtnl_unlock();
return len;
}
static ssize_t stp_state_store(struct device *d,
struct device_attribute *attr, const char *buf,
size_t len)
{
struct net_bridge *br = to_bridge(d);
char *endp;
unsigned long val;
if (!ns_capable(dev_net(br->dev)->user_ns, CAP_NET_ADMIN))
return -EPERM;
val = simple_strtoul(buf, &endp, 0);
if (endp == buf)
return -EINVAL;
if (!rtnl_trylock())
return restart_syscall();
br_stp_set_enabled(br, val);
rtnl_unlock();
return len;
}
