Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/net/wireless/virt_wifi.c b/drivers/net/wireless/virt_wifi.c
new file mode 100644
index 0000000..7997cc6
--- /dev/null
+++ b/drivers/net/wireless/virt_wifi.c
@@ -0,0 +1,676 @@
+// SPDX-License-Identifier: GPL-2.0
+/* drivers/net/wireless/virt_wifi.c
+ *
+ * A fake implementation of cfg80211_ops that can be tacked on to an ethernet
+ * net_device to make it appear as a wireless connection.
+ *
+ * Copyright (C) 2018 Google, Inc.
+ *
+ * Author: schuffelen@google.com
+ */
+
+#include <net/cfg80211.h>
+#include <net/rtnetlink.h>
+#include <linux/etherdevice.h>
+#include <linux/module.h>
+
+static struct wiphy *common_wiphy;
+
+struct virt_wifi_wiphy_priv {
+ struct delayed_work scan_result;
+ struct cfg80211_scan_request *scan_request;
+ bool being_deleted;
+};
+
+static struct ieee80211_channel channel_2ghz = {
+ .band = NL80211_BAND_2GHZ,
+ .center_freq = 2432,
+ .hw_value = 2432,
+ .max_power = 20,
+};
+
+static struct ieee80211_rate bitrates_2ghz[] = {
+ { .bitrate = 10 },
+ { .bitrate = 20 },
+ { .bitrate = 55 },
+ { .bitrate = 110 },
+ { .bitrate = 60 },
+ { .bitrate = 120 },
+ { .bitrate = 240 },
+};
+
+static struct ieee80211_supported_band band_2ghz = {
+ .channels = &channel_2ghz,
+ .bitrates = bitrates_2ghz,
+ .band = NL80211_BAND_2GHZ,
+ .n_channels = 1,
+ .n_bitrates = ARRAY_SIZE(bitrates_2ghz),
+ .ht_cap = {
+ .ht_supported = true,
+ .cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
+ IEEE80211_HT_CAP_GRN_FLD |
+ IEEE80211_HT_CAP_SGI_20 |
+ IEEE80211_HT_CAP_SGI_40 |
+ IEEE80211_HT_CAP_DSSSCCK40,
+ .ampdu_factor = 0x3,
+ .ampdu_density = 0x6,
+ .mcs = {
+ .rx_mask = {0xff, 0xff},
+ .tx_params = IEEE80211_HT_MCS_TX_DEFINED,
+ },
+ },
+};
+
+static struct ieee80211_channel channel_5ghz = {
+ .band = NL80211_BAND_5GHZ,
+ .center_freq = 5240,
+ .hw_value = 5240,
+ .max_power = 20,
+};
+
+static struct ieee80211_rate bitrates_5ghz[] = {
+ { .bitrate = 60 },
+ { .bitrate = 120 },
+ { .bitrate = 240 },
+};
+
+#define RX_MCS_MAP (IEEE80211_VHT_MCS_SUPPORT_0_9 << 0 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 2 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 4 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 6 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 8 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 10 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 12 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 14)
+
+#define TX_MCS_MAP (IEEE80211_VHT_MCS_SUPPORT_0_9 << 0 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 2 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 4 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 6 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 8 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 10 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 12 | \
+ IEEE80211_VHT_MCS_SUPPORT_0_9 << 14)
+
+static struct ieee80211_supported_band band_5ghz = {
+ .channels = &channel_5ghz,
+ .bitrates = bitrates_5ghz,
+ .band = NL80211_BAND_5GHZ,
+ .n_channels = 1,
+ .n_bitrates = ARRAY_SIZE(bitrates_5ghz),
+ .ht_cap = {
+ .ht_supported = true,
+ .cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
+ IEEE80211_HT_CAP_GRN_FLD |
+ IEEE80211_HT_CAP_SGI_20 |
+ IEEE80211_HT_CAP_SGI_40 |
+ IEEE80211_HT_CAP_DSSSCCK40,
+ .ampdu_factor = 0x3,
+ .ampdu_density = 0x6,
+ .mcs = {
+ .rx_mask = {0xff, 0xff},
+ .tx_params = IEEE80211_HT_MCS_TX_DEFINED,
+ },
+ },
+ .vht_cap = {
+ .vht_supported = true,
+ .cap = IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 |
+ IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ |
+ IEEE80211_VHT_CAP_RXLDPC |
+ IEEE80211_VHT_CAP_SHORT_GI_80 |
+ IEEE80211_VHT_CAP_SHORT_GI_160 |
+ IEEE80211_VHT_CAP_TXSTBC |
+ IEEE80211_VHT_CAP_RXSTBC_1 |
+ IEEE80211_VHT_CAP_RXSTBC_2 |
+ IEEE80211_VHT_CAP_RXSTBC_3 |
+ IEEE80211_VHT_CAP_RXSTBC_4 |
+ IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK,
+ .vht_mcs = {
+ .rx_mcs_map = cpu_to_le16(RX_MCS_MAP),
+ .tx_mcs_map = cpu_to_le16(TX_MCS_MAP),
+ }
+ },
+};
+
+/* Assigned at module init. Guaranteed locally-administered and unicast. */
+static u8 fake_router_bssid[ETH_ALEN] __ro_after_init = {};
+
+/* Called with the rtnl lock held. */
+static int virt_wifi_scan(struct wiphy *wiphy,
+ struct cfg80211_scan_request *request)
+{
+ struct virt_wifi_wiphy_priv *priv = wiphy_priv(wiphy);
+
+ wiphy_debug(wiphy, "scan\n");
+
+ if (priv->scan_request || priv->being_deleted)
+ return -EBUSY;
+
+ priv->scan_request = request;
+ schedule_delayed_work(&priv->scan_result, HZ * 2);
+
+ return 0;
+}
+
+/* Acquires and releases the rdev BSS lock. */
+static void virt_wifi_scan_result(struct work_struct *work)
+{
+ struct {
+ u8 tag;
+ u8 len;
+ u8 ssid[8];
+ } __packed ssid = {
+ .tag = WLAN_EID_SSID, .len = 8, .ssid = "VirtWifi",
+ };
+ struct cfg80211_bss *informed_bss;
+ struct virt_wifi_wiphy_priv *priv =
+ container_of(work, struct virt_wifi_wiphy_priv,
+ scan_result.work);
+ struct wiphy *wiphy = priv_to_wiphy(priv);
+ struct cfg80211_scan_info scan_info = { .aborted = false };
+
+ informed_bss = cfg80211_inform_bss(wiphy, &channel_5ghz,
+ CFG80211_BSS_FTYPE_PRESP,
+ fake_router_bssid,
+ ktime_get_boottime_ns(),
+ WLAN_CAPABILITY_ESS, 0,
+ (void *)&ssid, sizeof(ssid),
+ DBM_TO_MBM(-50), GFP_KERNEL);
+ cfg80211_put_bss(wiphy, informed_bss);
+
+ /* Schedules work which acquires and releases the rtnl lock. */
+ cfg80211_scan_done(priv->scan_request, &scan_info);
+ priv->scan_request = NULL;
+}
+
+/* May acquire and release the rdev BSS lock. */
+static void virt_wifi_cancel_scan(struct wiphy *wiphy)
+{
+ struct virt_wifi_wiphy_priv *priv = wiphy_priv(wiphy);
+
+ cancel_delayed_work_sync(&priv->scan_result);
+ /* Clean up dangling callbacks if necessary. */
+ if (priv->scan_request) {
+ struct cfg80211_scan_info scan_info = { .aborted = true };
+ /* Schedules work which acquires and releases the rtnl lock. */
+ cfg80211_scan_done(priv->scan_request, &scan_info);
+ priv->scan_request = NULL;
+ }
+}
+
+struct virt_wifi_netdev_priv {
+ struct delayed_work connect;
+ struct net_device *lowerdev;
+ struct net_device *upperdev;
+ u32 tx_packets;
+ u32 tx_failed;
+ u8 connect_requested_bss[ETH_ALEN];
+ bool is_up;
+ bool is_connected;
+ bool being_deleted;
+};
+
+/* Called with the rtnl lock held. */
+static int virt_wifi_connect(struct wiphy *wiphy, struct net_device *netdev,
+ struct cfg80211_connect_params *sme)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(netdev);
+ bool could_schedule;
+
+ if (priv->being_deleted || !priv->is_up)
+ return -EBUSY;
+
+ could_schedule = schedule_delayed_work(&priv->connect, HZ * 2);
+ if (!could_schedule)
+ return -EBUSY;
+
+ if (sme->bssid)
+ ether_addr_copy(priv->connect_requested_bss, sme->bssid);
+ else
+ eth_zero_addr(priv->connect_requested_bss);
+
+ wiphy_debug(wiphy, "connect\n");
+
+ return 0;
+}
+
+/* Acquires and releases the rdev event lock. */
+static void virt_wifi_connect_complete(struct work_struct *work)
+{
+ struct virt_wifi_netdev_priv *priv =
+ container_of(work, struct virt_wifi_netdev_priv, connect.work);
+ u8 *requested_bss = priv->connect_requested_bss;
+ bool has_addr = !is_zero_ether_addr(requested_bss);
+ bool right_addr = ether_addr_equal(requested_bss, fake_router_bssid);
+ u16 status = WLAN_STATUS_SUCCESS;
+
+ if (!priv->is_up || (has_addr && !right_addr))
+ status = WLAN_STATUS_UNSPECIFIED_FAILURE;
+ else
+ priv->is_connected = true;
+
+ /* Schedules an event that acquires the rtnl lock. */
+ cfg80211_connect_result(priv->upperdev, requested_bss, NULL, 0, NULL, 0,
+ status, GFP_KERNEL);
+ netif_carrier_on(priv->upperdev);
+}
+
+/* May acquire and release the rdev event lock. */
+static void virt_wifi_cancel_connect(struct net_device *netdev)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(netdev);
+
+ /* If there is work pending, clean up dangling callbacks. */
+ if (cancel_delayed_work_sync(&priv->connect)) {
+ /* Schedules an event that acquires the rtnl lock. */
+ cfg80211_connect_result(priv->upperdev,
+ priv->connect_requested_bss, NULL, 0,
+ NULL, 0,
+ WLAN_STATUS_UNSPECIFIED_FAILURE,
+ GFP_KERNEL);
+ }
+}
+
+/* Called with the rtnl lock held. Acquires the rdev event lock. */
+static int virt_wifi_disconnect(struct wiphy *wiphy, struct net_device *netdev,
+ u16 reason_code)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(netdev);
+
+ if (priv->being_deleted)
+ return -EBUSY;
+
+ wiphy_debug(wiphy, "disconnect\n");
+ virt_wifi_cancel_connect(netdev);
+
+ cfg80211_disconnected(netdev, reason_code, NULL, 0, true, GFP_KERNEL);
+ priv->is_connected = false;
+ netif_carrier_off(netdev);
+
+ return 0;
+}
+
+/* Called with the rtnl lock held. */
+static int virt_wifi_get_station(struct wiphy *wiphy, struct net_device *dev,
+ const u8 *mac, struct station_info *sinfo)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
+
+ wiphy_debug(wiphy, "get_station\n");
+
+ if (!priv->is_connected || !ether_addr_equal(mac, fake_router_bssid))
+ return -ENOENT;
+
+ sinfo->filled = BIT_ULL(NL80211_STA_INFO_TX_PACKETS) |
+ BIT_ULL(NL80211_STA_INFO_TX_FAILED) |
+ BIT_ULL(NL80211_STA_INFO_SIGNAL) |
+ BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
+ sinfo->tx_packets = priv->tx_packets;
+ sinfo->tx_failed = priv->tx_failed;
+ /* For CFG80211_SIGNAL_TYPE_MBM, value is expressed in _dBm_ */
+ sinfo->signal = -50;
+ sinfo->txrate = (struct rate_info) {
+ .legacy = 10, /* units are 100kbit/s */
+ };
+ return 0;
+}
+
+/* Called with the rtnl lock held. */
+static int virt_wifi_dump_station(struct wiphy *wiphy, struct net_device *dev,
+ int idx, u8 *mac, struct station_info *sinfo)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
+
+ wiphy_debug(wiphy, "dump_station\n");
+
+ if (idx != 0 || !priv->is_connected)
+ return -ENOENT;
+
+ ether_addr_copy(mac, fake_router_bssid);
+ return virt_wifi_get_station(wiphy, dev, fake_router_bssid, sinfo);
+}
+
+static const struct cfg80211_ops virt_wifi_cfg80211_ops = {
+ .scan = virt_wifi_scan,
+
+ .connect = virt_wifi_connect,
+ .disconnect = virt_wifi_disconnect,
+
+ .get_station = virt_wifi_get_station,
+ .dump_station = virt_wifi_dump_station,
+};
+
+/* Acquires and releases the rtnl lock. */
+static struct wiphy *virt_wifi_make_wiphy(void)
+{
+ struct wiphy *wiphy;
+ struct virt_wifi_wiphy_priv *priv;
+ int err;
+
+ wiphy = wiphy_new(&virt_wifi_cfg80211_ops, sizeof(*priv));
+
+ if (!wiphy)
+ return NULL;
+
+ wiphy->max_scan_ssids = 4;
+ wiphy->max_scan_ie_len = 1000;
+ wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
+
+ wiphy->bands[NL80211_BAND_2GHZ] = &band_2ghz;
+ wiphy->bands[NL80211_BAND_5GHZ] = &band_5ghz;
+ wiphy->bands[NL80211_BAND_60GHZ] = NULL;
+
+ wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
+
+ priv = wiphy_priv(wiphy);
+ priv->being_deleted = false;
+ priv->scan_request = NULL;
+ INIT_DELAYED_WORK(&priv->scan_result, virt_wifi_scan_result);
+
+ err = wiphy_register(wiphy);
+ if (err < 0) {
+ wiphy_free(wiphy);
+ return NULL;
+ }
+
+ return wiphy;
+}
+
+/* Acquires and releases the rtnl lock. */
+static void virt_wifi_destroy_wiphy(struct wiphy *wiphy)
+{
+ struct virt_wifi_wiphy_priv *priv;
+
+ WARN(!wiphy, "%s called with null wiphy", __func__);
+ if (!wiphy)
+ return;
+
+ priv = wiphy_priv(wiphy);
+ priv->being_deleted = true;
+ virt_wifi_cancel_scan(wiphy);
+
+ if (wiphy->registered)
+ wiphy_unregister(wiphy);
+ wiphy_free(wiphy);
+}
+
+/* Enters and exits a RCU-bh critical section. */
+static netdev_tx_t virt_wifi_start_xmit(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
+
+ priv->tx_packets++;
+ if (!priv->is_connected) {
+ priv->tx_failed++;
+ return NET_XMIT_DROP;
+ }
+
+ skb->dev = priv->lowerdev;
+ return dev_queue_xmit(skb);
+}
+
+/* Called with rtnl lock held. */
+static int virt_wifi_net_device_open(struct net_device *dev)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
+
+ priv->is_up = true;
+ return 0;
+}
+
+/* Called with rtnl lock held. */
+static int virt_wifi_net_device_stop(struct net_device *dev)
+{
+ struct virt_wifi_netdev_priv *n_priv = netdev_priv(dev);
+
+ n_priv->is_up = false;
+
+ if (!dev->ieee80211_ptr)
+ return 0;
+
+ virt_wifi_cancel_scan(dev->ieee80211_ptr->wiphy);
+ virt_wifi_cancel_connect(dev);
+ netif_carrier_off(dev);
+
+ return 0;
+}
+
+static const struct net_device_ops virt_wifi_ops = {
+ .ndo_start_xmit = virt_wifi_start_xmit,
+ .ndo_open = virt_wifi_net_device_open,
+ .ndo_stop = virt_wifi_net_device_stop,
+};
+
+/* Invoked as part of rtnl lock release. */
+static void virt_wifi_net_device_destructor(struct net_device *dev)
+{
+ /* Delayed past dellink to allow nl80211 to react to the device being
+ * deleted.
+ */
+ kfree(dev->ieee80211_ptr);
+ dev->ieee80211_ptr = NULL;
+ free_netdev(dev);
+}
+
+/* No lock interaction. */
+static void virt_wifi_setup(struct net_device *dev)
+{
+ ether_setup(dev);
+ dev->netdev_ops = &virt_wifi_ops;
+ dev->priv_destructor = virt_wifi_net_device_destructor;
+}
+
+/* Called in a RCU read critical section from netif_receive_skb */
+static rx_handler_result_t virt_wifi_rx_handler(struct sk_buff **pskb)
+{
+ struct sk_buff *skb = *pskb;
+ struct virt_wifi_netdev_priv *priv =
+ rcu_dereference(skb->dev->rx_handler_data);
+
+ if (!priv->is_connected)
+ return RX_HANDLER_PASS;
+
+ /* GFP_ATOMIC because this is a packet interrupt handler. */
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb) {
+ dev_err(&priv->upperdev->dev, "can't skb_share_check\n");
+ return RX_HANDLER_CONSUMED;
+ }
+
+ *pskb = skb;
+ skb->dev = priv->upperdev;
+ skb->pkt_type = PACKET_HOST;
+ return RX_HANDLER_ANOTHER;
+}
+
+/* Called with rtnl lock held. */
+static int virt_wifi_newlink(struct net *src_net, struct net_device *dev,
+ struct nlattr *tb[], struct nlattr *data[],
+ struct netlink_ext_ack *extack)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
+ int err;
+
+ if (!tb[IFLA_LINK])
+ return -EINVAL;
+
+ netif_carrier_off(dev);
+
+ priv->upperdev = dev;
+ priv->lowerdev = __dev_get_by_index(src_net,
+ nla_get_u32(tb[IFLA_LINK]));
+
+ if (!priv->lowerdev)
+ return -ENODEV;
+ if (!tb[IFLA_MTU])
+ dev->mtu = priv->lowerdev->mtu;
+ else if (dev->mtu > priv->lowerdev->mtu)
+ return -EINVAL;
+
+ err = netdev_rx_handler_register(priv->lowerdev, virt_wifi_rx_handler,
+ priv);
+ if (err) {
+ dev_err(&priv->lowerdev->dev,
+ "can't netdev_rx_handler_register: %d\n", err);
+ return err;
+ }
+
+ eth_hw_addr_inherit(dev, priv->lowerdev);
+ netif_stacked_transfer_operstate(priv->lowerdev, dev);
+
+ SET_NETDEV_DEV(dev, &priv->lowerdev->dev);
+ dev->ieee80211_ptr = kzalloc(sizeof(*dev->ieee80211_ptr), GFP_KERNEL);
+
+ if (!dev->ieee80211_ptr) {
+ err = -ENOMEM;
+ goto remove_handler;
+ }
+
+ dev->ieee80211_ptr->iftype = NL80211_IFTYPE_STATION;
+ dev->ieee80211_ptr->wiphy = common_wiphy;
+
+ err = register_netdevice(dev);
+ if (err) {
+ dev_err(&priv->lowerdev->dev, "can't register_netdevice: %d\n",
+ err);
+ goto free_wireless_dev;
+ }
+
+ err = netdev_upper_dev_link(priv->lowerdev, dev, extack);
+ if (err) {
+ dev_err(&priv->lowerdev->dev, "can't netdev_upper_dev_link: %d\n",
+ err);
+ goto unregister_netdev;
+ }
+
+ priv->being_deleted = false;
+ priv->is_connected = false;
+ priv->is_up = false;
+ INIT_DELAYED_WORK(&priv->connect, virt_wifi_connect_complete);
+ __module_get(THIS_MODULE);
+
+ return 0;
+unregister_netdev:
+ unregister_netdevice(dev);
+free_wireless_dev:
+ kfree(dev->ieee80211_ptr);
+ dev->ieee80211_ptr = NULL;
+remove_handler:
+ netdev_rx_handler_unregister(priv->lowerdev);
+
+ return err;
+}
+
+/* Called with rtnl lock held. */
+static void virt_wifi_dellink(struct net_device *dev,
+ struct list_head *head)
+{
+ struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
+
+ if (dev->ieee80211_ptr)
+ virt_wifi_cancel_scan(dev->ieee80211_ptr->wiphy);
+
+ priv->being_deleted = true;
+ virt_wifi_cancel_connect(dev);
+ netif_carrier_off(dev);
+
+ netdev_rx_handler_unregister(priv->lowerdev);
+ netdev_upper_dev_unlink(priv->lowerdev, dev);
+
+ unregister_netdevice_queue(dev, head);
+ module_put(THIS_MODULE);
+
+ /* Deleting the wiphy is handled in the module destructor. */
+}
+
+static struct rtnl_link_ops virt_wifi_link_ops = {
+ .kind = "virt_wifi",
+ .setup = virt_wifi_setup,
+ .newlink = virt_wifi_newlink,
+ .dellink = virt_wifi_dellink,
+ .priv_size = sizeof(struct virt_wifi_netdev_priv),
+};
+
+static bool netif_is_virt_wifi_dev(const struct net_device *dev)
+{
+ return rcu_access_pointer(dev->rx_handler) == virt_wifi_rx_handler;
+}
+
+static int virt_wifi_event(struct notifier_block *this, unsigned long event,
+ void *ptr)
+{
+ struct net_device *lower_dev = netdev_notifier_info_to_dev(ptr);
+ struct virt_wifi_netdev_priv *priv;
+ struct net_device *upper_dev;
+ LIST_HEAD(list_kill);
+
+ if (!netif_is_virt_wifi_dev(lower_dev))
+ return NOTIFY_DONE;
+
+ switch (event) {
+ case NETDEV_UNREGISTER:
+ priv = rtnl_dereference(lower_dev->rx_handler_data);
+ if (!priv)
+ return NOTIFY_DONE;
+
+ upper_dev = priv->upperdev;
+
+ upper_dev->rtnl_link_ops->dellink(upper_dev, &list_kill);
+ unregister_netdevice_many(&list_kill);
+ break;
+ }
+
+ return NOTIFY_DONE;
+}
+
+static struct notifier_block virt_wifi_notifier = {
+ .notifier_call = virt_wifi_event,
+};
+
+/* Acquires and releases the rtnl lock. */
+static int __init virt_wifi_init_module(void)
+{
+ int err;
+
+ /* Guaranteed to be locallly-administered and not multicast. */
+ eth_random_addr(fake_router_bssid);
+
+ err = register_netdevice_notifier(&virt_wifi_notifier);
+ if (err)
+ return err;
+
+ err = -ENOMEM;
+ common_wiphy = virt_wifi_make_wiphy();
+ if (!common_wiphy)
+ goto notifier;
+
+ err = rtnl_link_register(&virt_wifi_link_ops);
+ if (err)
+ goto destroy_wiphy;
+
+ return 0;
+
+destroy_wiphy:
+ virt_wifi_destroy_wiphy(common_wiphy);
+notifier:
+ unregister_netdevice_notifier(&virt_wifi_notifier);
+ return err;
+}
+
+/* Acquires and releases the rtnl lock. */
+static void __exit virt_wifi_cleanup_module(void)
+{
+ /* Will delete any devices that depend on the wiphy. */
+ rtnl_link_unregister(&virt_wifi_link_ops);
+ virt_wifi_destroy_wiphy(common_wiphy);
+ unregister_netdevice_notifier(&virt_wifi_notifier);
+}
+
+module_init(virt_wifi_init_module);
+module_exit(virt_wifi_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Cody Schuffelen <schuffelen@google.com>");
+MODULE_DESCRIPTION("Driver for a wireless wrapper of ethernet devices");
+MODULE_ALIAS_RTNL_LINK("virt_wifi");