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-rw-r--r--net/core/dev_ioctl.c512
1 files changed, 512 insertions, 0 deletions
diff --git a/net/core/dev_ioctl.c b/net/core/dev_ioctl.c
new file mode 100644
index 000000000..993420da2
--- /dev/null
+++ b/net/core/dev_ioctl.c
@@ -0,0 +1,512 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kmod.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/net_tstamp.h>
+#include <linux/wireless.h>
+#include <net/dsa.h>
+#include <net/wext.h>
+
+/*
+ * Map an interface index to its name (SIOCGIFNAME)
+ */
+
+/*
+ * We need this ioctl for efficient implementation of the
+ * if_indextoname() function required by the IPv6 API. Without
+ * it, we would have to search all the interfaces to find a
+ * match. --pb
+ */
+
+static int dev_ifname(struct net *net, struct ifreq *ifr)
+{
+ ifr->ifr_name[IFNAMSIZ-1] = 0;
+ return netdev_get_name(net, ifr->ifr_name, ifr->ifr_ifindex);
+}
+
+/*
+ * Perform a SIOCGIFCONF call. This structure will change
+ * size eventually, and there is nothing I can do about it.
+ * Thus we will need a 'compatibility mode'.
+ */
+
+int dev_ifconf(struct net *net, struct ifconf *ifc, int size)
+{
+ struct net_device *dev;
+ char __user *pos;
+ int len;
+ int total;
+
+ /*
+ * Fetch the caller's info block.
+ */
+
+ pos = ifc->ifc_buf;
+ len = ifc->ifc_len;
+
+ /*
+ * Loop over the interfaces, and write an info block for each.
+ */
+
+ total = 0;
+ for_each_netdev(net, dev) {
+ int done;
+ if (!pos)
+ done = inet_gifconf(dev, NULL, 0, size);
+ else
+ done = inet_gifconf(dev, pos + total,
+ len - total, size);
+ if (done < 0)
+ return -EFAULT;
+ total += done;
+ }
+
+ /*
+ * All done. Write the updated control block back to the caller.
+ */
+ ifc->ifc_len = total;
+
+ /*
+ * Both BSD and Solaris return 0 here, so we do too.
+ */
+ return 0;
+}
+
+/*
+ * Perform the SIOCxIFxxx calls, inside rcu_read_lock()
+ */
+static int dev_ifsioc_locked(struct net *net, struct ifreq *ifr, unsigned int cmd)
+{
+ int err;
+ struct net_device *dev = dev_get_by_name_rcu(net, ifr->ifr_name);
+
+ if (!dev)
+ return -ENODEV;
+
+ switch (cmd) {
+ case SIOCGIFFLAGS: /* Get interface flags */
+ ifr->ifr_flags = (short) dev_get_flags(dev);
+ return 0;
+
+ case SIOCGIFMETRIC: /* Get the metric on the interface
+ (currently unused) */
+ ifr->ifr_metric = 0;
+ return 0;
+
+ case SIOCGIFMTU: /* Get the MTU of a device */
+ ifr->ifr_mtu = dev->mtu;
+ return 0;
+
+ case SIOCGIFSLAVE:
+ err = -EINVAL;
+ break;
+
+ case SIOCGIFMAP:
+ ifr->ifr_map.mem_start = dev->mem_start;
+ ifr->ifr_map.mem_end = dev->mem_end;
+ ifr->ifr_map.base_addr = dev->base_addr;
+ ifr->ifr_map.irq = dev->irq;
+ ifr->ifr_map.dma = dev->dma;
+ ifr->ifr_map.port = dev->if_port;
+ return 0;
+
+ case SIOCGIFINDEX:
+ ifr->ifr_ifindex = dev->ifindex;
+ return 0;
+
+ case SIOCGIFTXQLEN:
+ ifr->ifr_qlen = dev->tx_queue_len;
+ return 0;
+
+ default:
+ /* dev_ioctl() should ensure this case
+ * is never reached
+ */
+ WARN_ON(1);
+ err = -ENOTTY;
+ break;
+
+ }
+ return err;
+}
+
+static int net_hwtstamp_validate(struct ifreq *ifr)
+{
+ struct hwtstamp_config cfg;
+ enum hwtstamp_tx_types tx_type;
+ enum hwtstamp_rx_filters rx_filter;
+ int tx_type_valid = 0;
+ int rx_filter_valid = 0;
+
+ if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
+ return -EFAULT;
+
+ if (cfg.flags) /* reserved for future extensions */
+ return -EINVAL;
+
+ tx_type = cfg.tx_type;
+ rx_filter = cfg.rx_filter;
+
+ switch (tx_type) {
+ case HWTSTAMP_TX_OFF:
+ case HWTSTAMP_TX_ON:
+ case HWTSTAMP_TX_ONESTEP_SYNC:
+ case HWTSTAMP_TX_ONESTEP_P2P:
+ tx_type_valid = 1;
+ break;
+ case __HWTSTAMP_TX_CNT:
+ /* not a real value */
+ break;
+ }
+
+ switch (rx_filter) {
+ case HWTSTAMP_FILTER_NONE:
+ case HWTSTAMP_FILTER_ALL:
+ case HWTSTAMP_FILTER_SOME:
+ case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
+ case HWTSTAMP_FILTER_PTP_V2_EVENT:
+ case HWTSTAMP_FILTER_PTP_V2_SYNC:
+ case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
+ case HWTSTAMP_FILTER_NTP_ALL:
+ rx_filter_valid = 1;
+ break;
+ case __HWTSTAMP_FILTER_CNT:
+ /* not a real value */
+ break;
+ }
+
+ if (!tx_type_valid || !rx_filter_valid)
+ return -ERANGE;
+
+ return 0;
+}
+
+static int dev_do_ioctl(struct net_device *dev,
+ struct ifreq *ifr, unsigned int cmd)
+{
+ const struct net_device_ops *ops = dev->netdev_ops;
+ int err = -EOPNOTSUPP;
+
+ err = dsa_ndo_do_ioctl(dev, ifr, cmd);
+ if (err == 0 || err != -EOPNOTSUPP)
+ return err;
+
+ if (ops->ndo_do_ioctl) {
+ if (netif_device_present(dev))
+ err = ops->ndo_do_ioctl(dev, ifr, cmd);
+ else
+ err = -ENODEV;
+ }
+
+ return err;
+}
+
+/*
+ * Perform the SIOCxIFxxx calls, inside rtnl_lock()
+ */
+static int dev_ifsioc(struct net *net, struct ifreq *ifr, unsigned int cmd)
+{
+ int err;
+ struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+ const struct net_device_ops *ops;
+
+ if (!dev)
+ return -ENODEV;
+
+ ops = dev->netdev_ops;
+
+ switch (cmd) {
+ case SIOCSIFFLAGS: /* Set interface flags */
+ return dev_change_flags(dev, ifr->ifr_flags, NULL);
+
+ case SIOCSIFMETRIC: /* Set the metric on the interface
+ (currently unused) */
+ return -EOPNOTSUPP;
+
+ case SIOCSIFMTU: /* Set the MTU of a device */
+ return dev_set_mtu(dev, ifr->ifr_mtu);
+
+ case SIOCSIFHWADDR:
+ if (dev->addr_len > sizeof(struct sockaddr))
+ return -EINVAL;
+ return dev_set_mac_address_user(dev, &ifr->ifr_hwaddr, NULL);
+
+ case SIOCSIFHWBROADCAST:
+ if (ifr->ifr_hwaddr.sa_family != dev->type)
+ return -EINVAL;
+ memcpy(dev->broadcast, ifr->ifr_hwaddr.sa_data,
+ min(sizeof(ifr->ifr_hwaddr.sa_data),
+ (size_t)dev->addr_len));
+ call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
+ return 0;
+
+ case SIOCSIFMAP:
+ if (ops->ndo_set_config) {
+ if (!netif_device_present(dev))
+ return -ENODEV;
+ return ops->ndo_set_config(dev, &ifr->ifr_map);
+ }
+ return -EOPNOTSUPP;
+
+ case SIOCADDMULTI:
+ if (!ops->ndo_set_rx_mode ||
+ ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+ return -EINVAL;
+ if (!netif_device_present(dev))
+ return -ENODEV;
+ return dev_mc_add_global(dev, ifr->ifr_hwaddr.sa_data);
+
+ case SIOCDELMULTI:
+ if (!ops->ndo_set_rx_mode ||
+ ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
+ return -EINVAL;
+ if (!netif_device_present(dev))
+ return -ENODEV;
+ return dev_mc_del_global(dev, ifr->ifr_hwaddr.sa_data);
+
+ case SIOCSIFTXQLEN:
+ if (ifr->ifr_qlen < 0)
+ return -EINVAL;
+ return dev_change_tx_queue_len(dev, ifr->ifr_qlen);
+
+ case SIOCSIFNAME:
+ ifr->ifr_newname[IFNAMSIZ-1] = '\0';
+ return dev_change_name(dev, ifr->ifr_newname);
+
+ case SIOCSHWTSTAMP:
+ err = net_hwtstamp_validate(ifr);
+ if (err)
+ return err;
+ fallthrough;
+
+ /*
+ * Unknown or private ioctl
+ */
+ default:
+ if ((cmd >= SIOCDEVPRIVATE &&
+ cmd <= SIOCDEVPRIVATE + 15) ||
+ cmd == SIOCBONDENSLAVE ||
+ cmd == SIOCBONDRELEASE ||
+ cmd == SIOCBONDSETHWADDR ||
+ cmd == SIOCBONDSLAVEINFOQUERY ||
+ cmd == SIOCBONDINFOQUERY ||
+ cmd == SIOCBONDCHANGEACTIVE ||
+ cmd == SIOCGMIIPHY ||
+ cmd == SIOCGMIIREG ||
+ cmd == SIOCSMIIREG ||
+ cmd == SIOCBRADDIF ||
+ cmd == SIOCBRDELIF ||
+ cmd == SIOCSHWTSTAMP ||
+ cmd == SIOCGHWTSTAMP ||
+ cmd == SIOCWANDEV) {
+ err = dev_do_ioctl(dev, ifr, cmd);
+ } else
+ err = -EINVAL;
+
+ }
+ return err;
+}
+
+/**
+ * dev_load - load a network module
+ * @net: the applicable net namespace
+ * @name: name of interface
+ *
+ * If a network interface is not present and the process has suitable
+ * privileges this function loads the module. If module loading is not
+ * available in this kernel then it becomes a nop.
+ */
+
+void dev_load(struct net *net, const char *name)
+{
+ struct net_device *dev;
+ int no_module;
+
+ rcu_read_lock();
+ dev = dev_get_by_name_rcu(net, name);
+ rcu_read_unlock();
+
+ no_module = !dev;
+ if (no_module && capable(CAP_NET_ADMIN))
+ no_module = request_module("netdev-%s", name);
+ if (no_module && capable(CAP_SYS_MODULE))
+ request_module("%s", name);
+}
+EXPORT_SYMBOL(dev_load);
+
+/*
+ * This function handles all "interface"-type I/O control requests. The actual
+ * 'doing' part of this is dev_ifsioc above.
+ */
+
+/**
+ * dev_ioctl - network device ioctl
+ * @net: the applicable net namespace
+ * @cmd: command to issue
+ * @ifr: pointer to a struct ifreq in user space
+ * @need_copyout: whether or not copy_to_user() should be called
+ *
+ * Issue ioctl functions to devices. This is normally called by the
+ * user space syscall interfaces but can sometimes be useful for
+ * other purposes. The return value is the return from the syscall if
+ * positive or a negative errno code on error.
+ */
+
+int dev_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr, bool *need_copyout)
+{
+ int ret;
+ char *colon;
+
+ if (need_copyout)
+ *need_copyout = true;
+ if (cmd == SIOCGIFNAME)
+ return dev_ifname(net, ifr);
+
+ ifr->ifr_name[IFNAMSIZ-1] = 0;
+
+ colon = strchr(ifr->ifr_name, ':');
+ if (colon)
+ *colon = 0;
+
+ /*
+ * See which interface the caller is talking about.
+ */
+
+ switch (cmd) {
+ case SIOCGIFHWADDR:
+ dev_load(net, ifr->ifr_name);
+ ret = dev_get_mac_address(&ifr->ifr_hwaddr, net, ifr->ifr_name);
+ if (colon)
+ *colon = ':';
+ return ret;
+ /*
+ * These ioctl calls:
+ * - can be done by all.
+ * - atomic and do not require locking.
+ * - return a value
+ */
+ case SIOCGIFFLAGS:
+ case SIOCGIFMETRIC:
+ case SIOCGIFMTU:
+ case SIOCGIFSLAVE:
+ case SIOCGIFMAP:
+ case SIOCGIFINDEX:
+ case SIOCGIFTXQLEN:
+ dev_load(net, ifr->ifr_name);
+ rcu_read_lock();
+ ret = dev_ifsioc_locked(net, ifr, cmd);
+ rcu_read_unlock();
+ if (colon)
+ *colon = ':';
+ return ret;
+
+ case SIOCETHTOOL:
+ dev_load(net, ifr->ifr_name);
+ rtnl_lock();
+ ret = dev_ethtool(net, ifr);
+ rtnl_unlock();
+ if (colon)
+ *colon = ':';
+ return ret;
+
+ /*
+ * These ioctl calls:
+ * - require superuser power.
+ * - require strict serialization.
+ * - return a value
+ */
+ case SIOCGMIIPHY:
+ case SIOCGMIIREG:
+ case SIOCSIFNAME:
+ dev_load(net, ifr->ifr_name);
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+ rtnl_lock();
+ ret = dev_ifsioc(net, ifr, cmd);
+ rtnl_unlock();
+ if (colon)
+ *colon = ':';
+ return ret;
+
+ /*
+ * These ioctl calls:
+ * - require superuser power.
+ * - require strict serialization.
+ * - do not return a value
+ */
+ case SIOCSIFMAP:
+ case SIOCSIFTXQLEN:
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ fallthrough;
+ /*
+ * These ioctl calls:
+ * - require local superuser power.
+ * - require strict serialization.
+ * - do not return a value
+ */
+ case SIOCSIFFLAGS:
+ case SIOCSIFMETRIC:
+ case SIOCSIFMTU:
+ case SIOCSIFHWADDR:
+ case SIOCSIFSLAVE:
+ case SIOCADDMULTI:
+ case SIOCDELMULTI:
+ case SIOCSIFHWBROADCAST:
+ case SIOCSMIIREG:
+ case SIOCBONDENSLAVE:
+ case SIOCBONDRELEASE:
+ case SIOCBONDSETHWADDR:
+ case SIOCBONDCHANGEACTIVE:
+ case SIOCBRADDIF:
+ case SIOCBRDELIF:
+ case SIOCSHWTSTAMP:
+ if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+ fallthrough;
+ case SIOCBONDSLAVEINFOQUERY:
+ case SIOCBONDINFOQUERY:
+ dev_load(net, ifr->ifr_name);
+ rtnl_lock();
+ ret = dev_ifsioc(net, ifr, cmd);
+ rtnl_unlock();
+ if (need_copyout)
+ *need_copyout = false;
+ return ret;
+
+ case SIOCGIFMEM:
+ /* Get the per device memory space. We can add this but
+ * currently do not support it */
+ case SIOCSIFMEM:
+ /* Set the per device memory buffer space.
+ * Not applicable in our case */
+ case SIOCSIFLINK:
+ return -ENOTTY;
+
+ /*
+ * Unknown or private ioctl.
+ */
+ default:
+ if (cmd == SIOCWANDEV ||
+ cmd == SIOCGHWTSTAMP ||
+ (cmd >= SIOCDEVPRIVATE &&
+ cmd <= SIOCDEVPRIVATE + 15)) {
+ dev_load(net, ifr->ifr_name);
+ rtnl_lock();
+ ret = dev_ifsioc(net, ifr, cmd);
+ rtnl_unlock();
+ return ret;
+ }
+ return -ENOTTY;
+ }
+}
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