Merge tag 'mac80211-next-for-davem-2018-12-19' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next

Johannes Berg says:

====================
This time we have too many changes to list, highlights:
 * virt_wifi - wireless control simulation on top of
   another network interface
 * hwsim configurability to test capabilities similar
   to real hardware
 * various mesh improvements
 * various radiotap vendor data fixes in mac80211
 * finally the nl_set_extack_cookie_u64() we talked
   about previously, used for
 * peer measurement APIs, right now only with FTM
   (flight time measurement) for location
 * made nl80211 radio/interface announcements more complete
 * various new HE (802.11ax) things:
   updates, TWT support, ...
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 824 insertions, 78 deletions

diff --git a/drivers/net/wireless/Kconfig b/drivers/net/wireless/Kconfig
index 166920ae23f8..8c456a66ac3b 100644
--- a/drivers/net/wireless/Kconfig
+++ b/drivers/net/wireless/Kconfig
@@ -114,4 +114,11 @@ config USB_NET_RNDIS_WLAN
 
 	  If you choose to build a module, it'll be called rndis_wlan.
 
+config VIRT_WIFI
+	tristate "Wifi wrapper for ethernet drivers"
+	depends on CFG80211
+	---help---
+	  This option adds support for ethernet connections to appear as if they
+	  are wifi connections through a special rtnetlink device.
+
 endif # WLAN
diff --git a/drivers/net/wireless/Makefile b/drivers/net/wireless/Makefile
index 7fc96306712a..6cfe74515c95 100644
--- a/drivers/net/wireless/Makefile
+++ b/drivers/net/wireless/Makefile
@@ -27,3 +27,5 @@ obj-$(CONFIG_PCMCIA_WL3501)	+= wl3501_cs.o
 obj-$(CONFIG_USB_NET_RNDIS_WLAN)	+= rndis_wlan.o
 
 obj-$(CONFIG_MAC80211_HWSIM)	+= mac80211_hwsim.o
+
+obj-$(CONFIG_VIRT_WIFI)	+= virt_wifi.o
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index d1464e3e1be2..3a4b8786f7ea 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -374,6 +374,20 @@ static const struct ieee80211_rate hwsim_rates[] = {
 	{ .bitrate = 540 }
 };
 
+static const u32 hwsim_ciphers[] = {
+	WLAN_CIPHER_SUITE_WEP40,
+	WLAN_CIPHER_SUITE_WEP104,
+	WLAN_CIPHER_SUITE_TKIP,
+	WLAN_CIPHER_SUITE_CCMP,
+	WLAN_CIPHER_SUITE_CCMP_256,
+	WLAN_CIPHER_SUITE_GCMP,
+	WLAN_CIPHER_SUITE_GCMP_256,
+	WLAN_CIPHER_SUITE_AES_CMAC,
+	WLAN_CIPHER_SUITE_BIP_CMAC_256,
+	WLAN_CIPHER_SUITE_BIP_GMAC_128,
+	WLAN_CIPHER_SUITE_BIP_GMAC_256,
+};
+
 #define OUI_QCA 0x001374
 #define QCA_NL80211_SUBCMD_TEST 1
 enum qca_nl80211_vendor_subcmds {
@@ -451,48 +465,6 @@ static const struct nl80211_vendor_cmd_info mac80211_hwsim_vendor_events[] = {
 	{ .vendor_id = OUI_QCA, .subcmd = 1 },
 };
 
-static const struct ieee80211_iface_limit hwsim_if_limits[] = {
-	{ .max = 1, .types = BIT(NL80211_IFTYPE_ADHOC) },
-	{ .max = 2048,  .types = BIT(NL80211_IFTYPE_STATION) |
-				 BIT(NL80211_IFTYPE_P2P_CLIENT) |
-#ifdef CONFIG_MAC80211_MESH
-				 BIT(NL80211_IFTYPE_MESH_POINT) |
-#endif
-				 BIT(NL80211_IFTYPE_AP) |
-				 BIT(NL80211_IFTYPE_P2P_GO) },
-	/* must be last, see hwsim_if_comb */
-	{ .max = 1, .types = BIT(NL80211_IFTYPE_P2P_DEVICE) }
-};
-
-static const struct ieee80211_iface_combination hwsim_if_comb[] = {
-	{
-		.limits = hwsim_if_limits,
-		/* remove the last entry which is P2P_DEVICE */
-		.n_limits = ARRAY_SIZE(hwsim_if_limits) - 1,
-		.max_interfaces = 2048,
-		.num_different_channels = 1,
-		.radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
-				       BIT(NL80211_CHAN_WIDTH_20) |
-				       BIT(NL80211_CHAN_WIDTH_40) |
-				       BIT(NL80211_CHAN_WIDTH_80) |
-				       BIT(NL80211_CHAN_WIDTH_160),
-	},
-};
-
-static const struct ieee80211_iface_combination hwsim_if_comb_p2p_dev[] = {
-	{
-		.limits = hwsim_if_limits,
-		.n_limits = ARRAY_SIZE(hwsim_if_limits),
-		.max_interfaces = 2048,
-		.num_different_channels = 1,
-		.radar_detect_widths = BIT(NL80211_CHAN_WIDTH_20_NOHT) |
-				       BIT(NL80211_CHAN_WIDTH_20) |
-				       BIT(NL80211_CHAN_WIDTH_40) |
-				       BIT(NL80211_CHAN_WIDTH_80) |
-				       BIT(NL80211_CHAN_WIDTH_160),
-	},
-};
-
 static spinlock_t hwsim_radio_lock;
 static LIST_HEAD(hwsim_radios);
 static struct rhashtable hwsim_radios_rht;
@@ -515,6 +487,10 @@ struct mac80211_hwsim_data {
 	struct ieee80211_channel channels_5ghz[ARRAY_SIZE(hwsim_channels_5ghz)];
 	struct ieee80211_rate rates[ARRAY_SIZE(hwsim_rates)];
 	struct ieee80211_iface_combination if_combination;
+	struct ieee80211_iface_limit if_limits[3];
+	int n_if_limits;
+
+	u32 ciphers[ARRAY_SIZE(hwsim_ciphers)];
 
 	struct mac_address addresses[2];
 	int channels, idx;
@@ -642,6 +618,8 @@ static const struct nla_policy hwsim_genl_policy[HWSIM_ATTR_MAX + 1] = {
 	[HWSIM_ATTR_NO_VIF] = { .type = NLA_FLAG },
 	[HWSIM_ATTR_FREQ] = { .type = NLA_U32 },
 	[HWSIM_ATTR_PERM_ADDR] = { .type = NLA_UNSPEC, .len = ETH_ALEN },
+	[HWSIM_ATTR_IFTYPE_SUPPORT] = { .type = NLA_U32 },
+	[HWSIM_ATTR_CIPHER_SUPPORT] = { .type = NLA_BINARY },
 };
 
 static void mac80211_hwsim_tx_frame(struct ieee80211_hw *hw,
@@ -2414,6 +2392,9 @@ struct hwsim_new_radio_params {
 	const char *hwname;
 	bool no_vif;
 	const u8 *perm_addr;
+	u32 iftypes;
+	u32 *ciphers;
+	u8 n_ciphers;
 };
 
 static void hwsim_mcast_config_msg(struct sk_buff *mcast_skb,
@@ -2630,6 +2611,27 @@ static void mac80211_hswim_he_capab(struct ieee80211_supported_band *sband)
 	sband->n_iftype_data = 1;
 }
 
+#ifdef CONFIG_MAC80211_MESH
+#define HWSIM_MESH_BIT BIT(NL80211_IFTYPE_MESH_POINT)
+#else
+#define HWSIM_MESH_BIT 0
+#endif
+
+#define HWSIM_DEFAULT_IF_LIMIT \
+	(BIT(NL80211_IFTYPE_STATION) | \
+	 BIT(NL80211_IFTYPE_P2P_CLIENT) | \
+	 BIT(NL80211_IFTYPE_AP) | \
+	 BIT(NL80211_IFTYPE_P2P_GO) | \
+	 HWSIM_MESH_BIT)
+
+#define HWSIM_IFTYPE_SUPPORT_MASK \
+	(BIT(NL80211_IFTYPE_STATION) | \
+	 BIT(NL80211_IFTYPE_AP) | \
+	 BIT(NL80211_IFTYPE_P2P_CLIENT) | \
+	 BIT(NL80211_IFTYPE_P2P_GO) | \
+	 BIT(NL80211_IFTYPE_ADHOC) | \
+	 BIT(NL80211_IFTYPE_MESH_POINT))
+
 static int mac80211_hwsim_new_radio(struct genl_info *info,
 				    struct hwsim_new_radio_params *param)
 {
@@ -2641,6 +2643,7 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 	const struct ieee80211_ops *ops = &mac80211_hwsim_ops;
 	struct net *net;
 	int idx;
+	int n_limits = 0;
 
 	if (WARN_ON(param->channels > 1 && !param->use_chanctx))
 		return -EINVAL;
@@ -2716,26 +2719,60 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 	if (info)
 		data->portid = info->snd_portid;
 
+	/* setup interface limits, only on interface types we support */
+	if (param->iftypes & BIT(NL80211_IFTYPE_ADHOC)) {
+		data->if_limits[n_limits].max = 1;
+		data->if_limits[n_limits].types = BIT(NL80211_IFTYPE_ADHOC);
+		n_limits++;
+	}
+
+	if (param->iftypes & HWSIM_DEFAULT_IF_LIMIT) {
+		data->if_limits[n_limits].max = 2048;
+		/*
+		 * For this case, we may only support a subset of
+		 * HWSIM_DEFAULT_IF_LIMIT, therefore we only want to add the
+		 * bits that both param->iftype & HWSIM_DEFAULT_IF_LIMIT have.
+		 */
+		data->if_limits[n_limits].types =
+					HWSIM_DEFAULT_IF_LIMIT & param->iftypes;
+		n_limits++;
+	}
+
+	if (param->iftypes & BIT(NL80211_IFTYPE_P2P_DEVICE)) {
+		data->if_limits[n_limits].max = 1;
+		data->if_limits[n_limits].types =
+						BIT(NL80211_IFTYPE_P2P_DEVICE);
+		n_limits++;
+	}
+
 	if (data->use_chanctx) {
 		hw->wiphy->max_scan_ssids = 255;
 		hw->wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 		hw->wiphy->max_remain_on_channel_duration = 1000;
-		hw->wiphy->iface_combinations = &data->if_combination;
-		if (param->p2p_device)
-			data->if_combination = hwsim_if_comb_p2p_dev[0];
-		else
-			data->if_combination = hwsim_if_comb[0];
-		hw->wiphy->n_iface_combinations = 1;
-		/* For channels > 1 DFS is not allowed */
 		data->if_combination.radar_detect_widths = 0;
 		data->if_combination.num_different_channels = data->channels;
-	} else if (param->p2p_device) {
-		hw->wiphy->iface_combinations = hwsim_if_comb_p2p_dev;
-		hw->wiphy->n_iface_combinations =
-			ARRAY_SIZE(hwsim_if_comb_p2p_dev);
 	} else {
-		hw->wiphy->iface_combinations = hwsim_if_comb;
-		hw->wiphy->n_iface_combinations = ARRAY_SIZE(hwsim_if_comb);
+		data->if_combination.num_different_channels = 1;
+		data->if_combination.radar_detect_widths =
+					BIT(NL80211_CHAN_WIDTH_20_NOHT) |
+					BIT(NL80211_CHAN_WIDTH_20) |
+					BIT(NL80211_CHAN_WIDTH_40) |
+					BIT(NL80211_CHAN_WIDTH_80) |
+					BIT(NL80211_CHAN_WIDTH_160);
+	}
+
+	data->if_combination.n_limits = n_limits;
+	data->if_combination.max_interfaces = 2048;
+	data->if_combination.limits = data->if_limits;
+
+	hw->wiphy->iface_combinations = &data->if_combination;
+	hw->wiphy->n_iface_combinations = 1;
+
+	if (param->ciphers) {
+		memcpy(data->ciphers, param->ciphers,
+		       param->n_ciphers * sizeof(u32));
+		hw->wiphy->cipher_suites = data->ciphers;
+		hw->wiphy->n_cipher_suites = param->n_ciphers;
 	}
 
 	INIT_DELAYED_WORK(&data->roc_start, hw_roc_start);
@@ -2744,15 +2781,6 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 
 	hw->queues = 5;
 	hw->offchannel_tx_hw_queue = 4;
-	hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION) |
-				     BIT(NL80211_IFTYPE_AP) |
-				     BIT(NL80211_IFTYPE_P2P_CLIENT) |
-				     BIT(NL80211_IFTYPE_P2P_GO) |
-				     BIT(NL80211_IFTYPE_ADHOC) |
-				     BIT(NL80211_IFTYPE_MESH_POINT);
-
-	if (param->p2p_device)
-		hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_P2P_DEVICE);
 
 	ieee80211_hw_set(hw, SUPPORT_FAST_XMIT);
 	ieee80211_hw_set(hw, CHANCTX_STA_CSA);
@@ -2778,6 +2806,8 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 			       NL80211_FEATURE_SCAN_RANDOM_MAC_ADDR;
 	wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_VHT_IBSS);
 
+	hw->wiphy->interface_modes = param->iftypes;
+
 	/* ask mac80211 to reserve space for magic */
 	hw->vif_data_size = sizeof(struct hwsim_vif_priv);
 	hw->sta_data_size = sizeof(struct hwsim_sta_priv);
@@ -3293,6 +3323,29 @@ static int hwsim_register_received_nl(struct sk_buff *skb_2,
 	return 0;
 }
 
+/* ensures ciphers only include ciphers listed in 'hwsim_ciphers' array */
+static bool hwsim_known_ciphers(const u32 *ciphers, int n_ciphers)
+{
+	int i;
+
+	for (i = 0; i < n_ciphers; i++) {
+		int j;
+		int found = 0;
+
+		for (j = 0; j < ARRAY_SIZE(hwsim_ciphers); j++) {
+			if (ciphers[i] == hwsim_ciphers[j]) {
+				found = 1;
+				break;
+			}
+		}
+
+		if (!found)
+			return false;
+	}
+
+	return true;
+}
+
 static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 {
 	struct hwsim_new_radio_params param = { 0 };
@@ -3321,15 +3374,6 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 	if (info->attrs[HWSIM_ATTR_NO_VIF])
 		param.no_vif = true;
 
-	if (info->attrs[HWSIM_ATTR_RADIO_NAME]) {
-		hwname = kasprintf(GFP_KERNEL, "%.*s",
-				   nla_len(info->attrs[HWSIM_ATTR_RADIO_NAME]),
-				   (char *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]));
-		if (!hwname)
-			return -ENOMEM;
-		param.hwname = hwname;
-	}
-
 	if (info->attrs[HWSIM_ATTR_USE_CHANCTX])
 		param.use_chanctx = true;
 	else
@@ -3342,10 +3386,8 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 	if (info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]) {
 		u32 idx = nla_get_u32(info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]);
 
-		if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom)) {
-			kfree(hwname);
+		if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom))
 			return -EINVAL;
-		}
 
 		idx = array_index_nospec(idx,
 					 ARRAY_SIZE(hwsim_world_regdom_custom));
@@ -3358,14 +3400,72 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 			GENL_SET_ERR_MSG(info,"MAC is no valid source addr");
 			NL_SET_BAD_ATTR(info->extack,
 					info->attrs[HWSIM_ATTR_PERM_ADDR]);
-			kfree(hwname);
 			return -EINVAL;
 		}
 
-
 		param.perm_addr = nla_data(info->attrs[HWSIM_ATTR_PERM_ADDR]);
 	}
 
+	if (info->attrs[HWSIM_ATTR_IFTYPE_SUPPORT]) {
+		param.iftypes =
+			nla_get_u32(info->attrs[HWSIM_ATTR_IFTYPE_SUPPORT]);
+
+		if (param.iftypes & ~HWSIM_IFTYPE_SUPPORT_MASK) {
+			NL_SET_ERR_MSG_ATTR(info->extack,
+					    info->attrs[HWSIM_ATTR_IFTYPE_SUPPORT],
+					    "cannot support more iftypes than kernel");
+			return -EINVAL;
+		}
+	} else {
+		param.iftypes = HWSIM_IFTYPE_SUPPORT_MASK;
+	}
+
+	/* ensure both flag and iftype support is honored */
+	if (param.p2p_device ||
+	    param.iftypes & BIT(NL80211_IFTYPE_P2P_DEVICE)) {
+		param.iftypes |= BIT(NL80211_IFTYPE_P2P_DEVICE);
+		param.p2p_device = true;
+	}
+
+	if (info->attrs[HWSIM_ATTR_CIPHER_SUPPORT]) {
+		u32 len = nla_len(info->attrs[HWSIM_ATTR_CIPHER_SUPPORT]);
+
+		param.ciphers =
+			nla_data(info->attrs[HWSIM_ATTR_CIPHER_SUPPORT]);
+
+		if (len % sizeof(u32)) {
+			NL_SET_ERR_MSG_ATTR(info->extack,
+					    info->attrs[HWSIM_ATTR_CIPHER_SUPPORT],
+					    "bad cipher list length");
+			return -EINVAL;
+		}
+
+		param.n_ciphers = len / sizeof(u32);
+
+		if (param.n_ciphers > ARRAY_SIZE(hwsim_ciphers)) {
+			NL_SET_ERR_MSG_ATTR(info->extack,
+					    info->attrs[HWSIM_ATTR_CIPHER_SUPPORT],
+					    "too many ciphers specified");
+			return -EINVAL;
+		}
+
+		if (!hwsim_known_ciphers(param.ciphers, param.n_ciphers)) {
+			NL_SET_ERR_MSG_ATTR(info->extack,
+					    info->attrs[HWSIM_ATTR_CIPHER_SUPPORT],
+					    "unsupported ciphers specified");
+			return -EINVAL;
+		}
+	}
+
+	if (info->attrs[HWSIM_ATTR_RADIO_NAME]) {
+		hwname = kasprintf(GFP_KERNEL, "%.*s",
+				   nla_len(info->attrs[HWSIM_ATTR_RADIO_NAME]),
+				   (char *)nla_data(info->attrs[HWSIM_ATTR_RADIO_NAME]));
+		if (!hwname)
+			return -ENOMEM;
+		param.hwname = hwname;
+	}
+
 	ret = mac80211_hwsim_new_radio(info, &param);
 	kfree(hwname);
 	return ret;
@@ -3785,6 +3885,7 @@ static int __init init_mac80211_hwsim(void)
 
 		param.p2p_device = support_p2p_device;
 		param.use_chanctx = channels > 1;
+		param.iftypes = HWSIM_IFTYPE_SUPPORT_MASK;
 
 		err = mac80211_hwsim_new_radio(NULL, &param);
 		if (err < 0)
diff --git a/drivers/net/wireless/mac80211_hwsim.h b/drivers/net/wireless/mac80211_hwsim.h
index 0fe3199f8c72..a1ef8457fad4 100644
--- a/drivers/net/wireless/mac80211_hwsim.h
+++ b/drivers/net/wireless/mac80211_hwsim.h
@@ -132,6 +132,8 @@ enum {
  * @HWSIM_ATTR_TX_INFO_FLAGS: additional flags for corresponding
  *	rates of %HWSIM_ATTR_TX_INFO
  * @HWSIM_ATTR_PERM_ADDR: permanent mac address of new radio
+ * @HWSIM_ATTR_IFTYPE_SUPPORT: u32 attribute of supported interface types bits
+ * @HWSIM_ATTR_CIPHER_SUPPORT: u32 array of supported cipher types
  * @__HWSIM_ATTR_MAX: enum limit
  */
 
@@ -160,6 +162,8 @@ enum {
 	HWSIM_ATTR_PAD,
 	HWSIM_ATTR_TX_INFO_FLAGS,
 	HWSIM_ATTR_PERM_ADDR,
+	HWSIM_ATTR_IFTYPE_SUPPORT,
+	HWSIM_ATTR_CIPHER_SUPPORT,
 	__HWSIM_ATTR_MAX,
 };
 #define HWSIM_ATTR_MAX (__HWSIM_ATTR_MAX - 1)
diff --git a/drivers/net/wireless/virt_wifi.c b/drivers/net/wireless/virt_wifi.c
new file mode 100644
index 000000000000..64b218699656
--- /dev/null
+++ b/drivers/net/wireless/virt_wifi.c
@@ -0,0 +1,632 @@
+// 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>
+
+#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_boot_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->regulatory_flags = REGULATORY_WIPHY_SELF_MANAGED;
+	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);
+	struct virt_wifi_wiphy_priv *w_priv;
+
+	n_priv->is_up = false;
+
+	if (!dev->ieee80211_ptr)
+		return 0;
+	w_priv = wiphy_priv(dev->ieee80211_ptr->wiphy);
+
+	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)
+		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);
+
+	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);
+
+	/* 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),
+};
+
+/* 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);
+
+	common_wiphy = virt_wifi_make_wiphy();
+	if (!common_wiphy)
+		return -ENOMEM;
+
+	err = rtnl_link_register(&virt_wifi_link_ops);
+	if (err)
+		virt_wifi_destroy_wiphy(common_wiphy);
+
+	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);
+}
+
+module_init(virt_wifi_init_module);
+module_exit(virt_wifi_cleanup_module);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Cody Schuffelen <schuffelen@google.com>");
+MODULE_DESC