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697 lines
18 KiB
697 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* drivers/net/wireless/virt_wifi.c |
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* |
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* A fake implementation of cfg80211_ops that can be tacked on to an ethernet |
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* net_device to make it appear as a wireless connection. |
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* |
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* Copyright (C) 2018 Google, Inc. |
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* |
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* Author: [email protected] |
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*/ |
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#include <net/cfg80211.h> |
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#include <net/rtnetlink.h> |
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#include <linux/etherdevice.h> |
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#include <linux/math64.h> |
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#include <linux/module.h> |
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static struct wiphy *common_wiphy; |
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struct virt_wifi_wiphy_priv { |
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struct delayed_work scan_result; |
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struct cfg80211_scan_request *scan_request; |
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bool being_deleted; |
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}; |
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static struct ieee80211_channel channel_2ghz = { |
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.band = NL80211_BAND_2GHZ, |
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.center_freq = 2432, |
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.hw_value = 2432, |
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.max_power = 20, |
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}; |
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static struct ieee80211_rate bitrates_2ghz[] = { |
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{ .bitrate = 10 }, |
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{ .bitrate = 20 }, |
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{ .bitrate = 55 }, |
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{ .bitrate = 110 }, |
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{ .bitrate = 60 }, |
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{ .bitrate = 120 }, |
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{ .bitrate = 240 }, |
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}; |
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static struct ieee80211_supported_band band_2ghz = { |
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.channels = &channel_2ghz, |
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.bitrates = bitrates_2ghz, |
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.band = NL80211_BAND_2GHZ, |
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.n_channels = 1, |
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.n_bitrates = ARRAY_SIZE(bitrates_2ghz), |
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.ht_cap = { |
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.ht_supported = true, |
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.cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 | |
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IEEE80211_HT_CAP_GRN_FLD | |
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IEEE80211_HT_CAP_SGI_20 | |
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IEEE80211_HT_CAP_SGI_40 | |
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IEEE80211_HT_CAP_DSSSCCK40, |
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.ampdu_factor = 0x3, |
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.ampdu_density = 0x6, |
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.mcs = { |
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.rx_mask = {0xff, 0xff}, |
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.tx_params = IEEE80211_HT_MCS_TX_DEFINED, |
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}, |
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}, |
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}; |
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static struct ieee80211_channel channel_5ghz = { |
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.band = NL80211_BAND_5GHZ, |
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.center_freq = 5240, |
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.hw_value = 5240, |
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.max_power = 20, |
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}; |
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static struct ieee80211_rate bitrates_5ghz[] = { |
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{ .bitrate = 60 }, |
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{ .bitrate = 120 }, |
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{ .bitrate = 240 }, |
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}; |
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#define RX_MCS_MAP (IEEE80211_VHT_MCS_SUPPORT_0_9 << 0 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 2 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 4 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 6 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 8 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 10 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 12 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 14) |
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#define TX_MCS_MAP (IEEE80211_VHT_MCS_SUPPORT_0_9 << 0 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 2 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 4 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 6 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 8 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 10 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 12 | \ |
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IEEE80211_VHT_MCS_SUPPORT_0_9 << 14) |
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static struct ieee80211_supported_band band_5ghz = { |
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.channels = &channel_5ghz, |
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.bitrates = bitrates_5ghz, |
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.band = NL80211_BAND_5GHZ, |
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.n_channels = 1, |
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.n_bitrates = ARRAY_SIZE(bitrates_5ghz), |
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.ht_cap = { |
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.ht_supported = true, |
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.cap = IEEE80211_HT_CAP_SUP_WIDTH_20_40 | |
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IEEE80211_HT_CAP_GRN_FLD | |
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IEEE80211_HT_CAP_SGI_20 | |
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IEEE80211_HT_CAP_SGI_40 | |
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IEEE80211_HT_CAP_DSSSCCK40, |
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.ampdu_factor = 0x3, |
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.ampdu_density = 0x6, |
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.mcs = { |
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.rx_mask = {0xff, 0xff}, |
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.tx_params = IEEE80211_HT_MCS_TX_DEFINED, |
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}, |
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}, |
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.vht_cap = { |
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.vht_supported = true, |
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.cap = IEEE80211_VHT_CAP_MAX_MPDU_LENGTH_11454 | |
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IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ | |
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IEEE80211_VHT_CAP_RXLDPC | |
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IEEE80211_VHT_CAP_SHORT_GI_80 | |
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IEEE80211_VHT_CAP_SHORT_GI_160 | |
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IEEE80211_VHT_CAP_TXSTBC | |
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IEEE80211_VHT_CAP_RXSTBC_1 | |
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IEEE80211_VHT_CAP_RXSTBC_2 | |
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IEEE80211_VHT_CAP_RXSTBC_3 | |
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IEEE80211_VHT_CAP_RXSTBC_4 | |
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IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK, |
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.vht_mcs = { |
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.rx_mcs_map = cpu_to_le16(RX_MCS_MAP), |
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.tx_mcs_map = cpu_to_le16(TX_MCS_MAP), |
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} |
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}, |
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}; |
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/* Assigned at module init. Guaranteed locally-administered and unicast. */ |
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static u8 fake_router_bssid[ETH_ALEN] __ro_after_init = {}; |
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static void virt_wifi_inform_bss(struct wiphy *wiphy) |
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{ |
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u64 tsf = div_u64(ktime_get_boottime_ns(), 1000); |
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struct cfg80211_bss *informed_bss; |
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static const struct { |
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u8 tag; |
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u8 len; |
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u8 ssid[8]; |
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} __packed ssid = { |
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.tag = WLAN_EID_SSID, |
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.len = 8, |
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.ssid = "VirtWifi", |
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}; |
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informed_bss = cfg80211_inform_bss(wiphy, &channel_5ghz, |
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CFG80211_BSS_FTYPE_PRESP, |
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fake_router_bssid, tsf, |
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WLAN_CAPABILITY_ESS, 0, |
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(void *)&ssid, sizeof(ssid), |
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DBM_TO_MBM(-50), GFP_KERNEL); |
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cfg80211_put_bss(wiphy, informed_bss); |
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} |
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/* Called with the rtnl lock held. */ |
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static int virt_wifi_scan(struct wiphy *wiphy, |
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struct cfg80211_scan_request *request) |
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{ |
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struct virt_wifi_wiphy_priv *priv = wiphy_priv(wiphy); |
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wiphy_debug(wiphy, "scan\n"); |
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if (priv->scan_request || priv->being_deleted) |
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return -EBUSY; |
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priv->scan_request = request; |
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schedule_delayed_work(&priv->scan_result, HZ * 2); |
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return 0; |
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} |
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/* Acquires and releases the rdev BSS lock. */ |
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static void virt_wifi_scan_result(struct work_struct *work) |
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{ |
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struct virt_wifi_wiphy_priv *priv = |
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container_of(work, struct virt_wifi_wiphy_priv, |
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scan_result.work); |
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struct wiphy *wiphy = priv_to_wiphy(priv); |
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struct cfg80211_scan_info scan_info = { .aborted = false }; |
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virt_wifi_inform_bss(wiphy); |
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/* Schedules work which acquires and releases the rtnl lock. */ |
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cfg80211_scan_done(priv->scan_request, &scan_info); |
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priv->scan_request = NULL; |
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} |
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/* May acquire and release the rdev BSS lock. */ |
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static void virt_wifi_cancel_scan(struct wiphy *wiphy) |
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{ |
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struct virt_wifi_wiphy_priv *priv = wiphy_priv(wiphy); |
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cancel_delayed_work_sync(&priv->scan_result); |
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/* Clean up dangling callbacks if necessary. */ |
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if (priv->scan_request) { |
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struct cfg80211_scan_info scan_info = { .aborted = true }; |
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/* Schedules work which acquires and releases the rtnl lock. */ |
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cfg80211_scan_done(priv->scan_request, &scan_info); |
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priv->scan_request = NULL; |
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} |
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} |
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struct virt_wifi_netdev_priv { |
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struct delayed_work connect; |
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struct net_device *lowerdev; |
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struct net_device *upperdev; |
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u32 tx_packets; |
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u32 tx_failed; |
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u8 connect_requested_bss[ETH_ALEN]; |
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bool is_up; |
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bool is_connected; |
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bool being_deleted; |
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}; |
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/* Called with the rtnl lock held. */ |
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static int virt_wifi_connect(struct wiphy *wiphy, struct net_device *netdev, |
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struct cfg80211_connect_params *sme) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(netdev); |
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bool could_schedule; |
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if (priv->being_deleted || !priv->is_up) |
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return -EBUSY; |
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could_schedule = schedule_delayed_work(&priv->connect, HZ * 2); |
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if (!could_schedule) |
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return -EBUSY; |
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if (sme->bssid) { |
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ether_addr_copy(priv->connect_requested_bss, sme->bssid); |
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} else { |
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virt_wifi_inform_bss(wiphy); |
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eth_zero_addr(priv->connect_requested_bss); |
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} |
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wiphy_debug(wiphy, "connect\n"); |
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return 0; |
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} |
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/* Acquires and releases the rdev event lock. */ |
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static void virt_wifi_connect_complete(struct work_struct *work) |
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{ |
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struct virt_wifi_netdev_priv *priv = |
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container_of(work, struct virt_wifi_netdev_priv, connect.work); |
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u8 *requested_bss = priv->connect_requested_bss; |
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bool right_addr = ether_addr_equal(requested_bss, fake_router_bssid); |
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u16 status = WLAN_STATUS_SUCCESS; |
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if (is_zero_ether_addr(requested_bss)) |
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requested_bss = NULL; |
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if (!priv->is_up || (requested_bss && !right_addr)) |
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status = WLAN_STATUS_UNSPECIFIED_FAILURE; |
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else |
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priv->is_connected = true; |
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/* Schedules an event that acquires the rtnl lock. */ |
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cfg80211_connect_result(priv->upperdev, requested_bss, NULL, 0, NULL, 0, |
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status, GFP_KERNEL); |
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netif_carrier_on(priv->upperdev); |
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} |
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/* May acquire and release the rdev event lock. */ |
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static void virt_wifi_cancel_connect(struct net_device *netdev) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(netdev); |
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/* If there is work pending, clean up dangling callbacks. */ |
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if (cancel_delayed_work_sync(&priv->connect)) { |
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/* Schedules an event that acquires the rtnl lock. */ |
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cfg80211_connect_result(priv->upperdev, |
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priv->connect_requested_bss, NULL, 0, |
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NULL, 0, |
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WLAN_STATUS_UNSPECIFIED_FAILURE, |
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GFP_KERNEL); |
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} |
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} |
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/* Called with the rtnl lock held. Acquires the rdev event lock. */ |
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static int virt_wifi_disconnect(struct wiphy *wiphy, struct net_device *netdev, |
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u16 reason_code) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(netdev); |
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if (priv->being_deleted) |
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return -EBUSY; |
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wiphy_debug(wiphy, "disconnect\n"); |
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virt_wifi_cancel_connect(netdev); |
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cfg80211_disconnected(netdev, reason_code, NULL, 0, true, GFP_KERNEL); |
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priv->is_connected = false; |
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netif_carrier_off(netdev); |
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return 0; |
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} |
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/* Called with the rtnl lock held. */ |
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static int virt_wifi_get_station(struct wiphy *wiphy, struct net_device *dev, |
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const u8 *mac, struct station_info *sinfo) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev); |
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wiphy_debug(wiphy, "get_station\n"); |
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if (!priv->is_connected || !ether_addr_equal(mac, fake_router_bssid)) |
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return -ENOENT; |
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sinfo->filled = BIT_ULL(NL80211_STA_INFO_TX_PACKETS) | |
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BIT_ULL(NL80211_STA_INFO_TX_FAILED) | |
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BIT_ULL(NL80211_STA_INFO_SIGNAL) | |
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BIT_ULL(NL80211_STA_INFO_TX_BITRATE); |
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sinfo->tx_packets = priv->tx_packets; |
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sinfo->tx_failed = priv->tx_failed; |
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/* For CFG80211_SIGNAL_TYPE_MBM, value is expressed in _dBm_ */ |
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sinfo->signal = -50; |
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sinfo->txrate = (struct rate_info) { |
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.legacy = 10, /* units are 100kbit/s */ |
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}; |
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return 0; |
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} |
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/* Called with the rtnl lock held. */ |
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static int virt_wifi_dump_station(struct wiphy *wiphy, struct net_device *dev, |
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int idx, u8 *mac, struct station_info *sinfo) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev); |
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wiphy_debug(wiphy, "dump_station\n"); |
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if (idx != 0 || !priv->is_connected) |
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return -ENOENT; |
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ether_addr_copy(mac, fake_router_bssid); |
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return virt_wifi_get_station(wiphy, dev, fake_router_bssid, sinfo); |
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} |
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static const struct cfg80211_ops virt_wifi_cfg80211_ops = { |
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.scan = virt_wifi_scan, |
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.connect = virt_wifi_connect, |
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.disconnect = virt_wifi_disconnect, |
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.get_station = virt_wifi_get_station, |
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.dump_station = virt_wifi_dump_station, |
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}; |
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/* Acquires and releases the rtnl lock. */ |
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static struct wiphy *virt_wifi_make_wiphy(void) |
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{ |
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struct wiphy *wiphy; |
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struct virt_wifi_wiphy_priv *priv; |
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int err; |
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wiphy = wiphy_new(&virt_wifi_cfg80211_ops, sizeof(*priv)); |
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if (!wiphy) |
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return NULL; |
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wiphy->max_scan_ssids = 4; |
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wiphy->max_scan_ie_len = 1000; |
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wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM; |
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wiphy->bands[NL80211_BAND_2GHZ] = &band_2ghz; |
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wiphy->bands[NL80211_BAND_5GHZ] = &band_5ghz; |
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wiphy->bands[NL80211_BAND_60GHZ] = NULL; |
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wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION); |
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priv = wiphy_priv(wiphy); |
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priv->being_deleted = false; |
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priv->scan_request = NULL; |
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INIT_DELAYED_WORK(&priv->scan_result, virt_wifi_scan_result); |
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err = wiphy_register(wiphy); |
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if (err < 0) { |
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wiphy_free(wiphy); |
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return NULL; |
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} |
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return wiphy; |
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} |
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/* Acquires and releases the rtnl lock. */ |
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static void virt_wifi_destroy_wiphy(struct wiphy *wiphy) |
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{ |
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struct virt_wifi_wiphy_priv *priv; |
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WARN(!wiphy, "%s called with null wiphy", __func__); |
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if (!wiphy) |
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return; |
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priv = wiphy_priv(wiphy); |
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priv->being_deleted = true; |
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virt_wifi_cancel_scan(wiphy); |
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if (wiphy->registered) |
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wiphy_unregister(wiphy); |
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wiphy_free(wiphy); |
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} |
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/* Enters and exits a RCU-bh critical section. */ |
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static netdev_tx_t virt_wifi_start_xmit(struct sk_buff *skb, |
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struct net_device *dev) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev); |
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priv->tx_packets++; |
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if (!priv->is_connected) { |
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priv->tx_failed++; |
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return NET_XMIT_DROP; |
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} |
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skb->dev = priv->lowerdev; |
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return dev_queue_xmit(skb); |
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} |
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/* Called with rtnl lock held. */ |
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static int virt_wifi_net_device_open(struct net_device *dev) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev); |
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priv->is_up = true; |
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return 0; |
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} |
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/* Called with rtnl lock held. */ |
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static int virt_wifi_net_device_stop(struct net_device *dev) |
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{ |
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struct virt_wifi_netdev_priv *n_priv = netdev_priv(dev); |
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n_priv->is_up = false; |
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if (!dev->ieee80211_ptr) |
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return 0; |
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virt_wifi_cancel_scan(dev->ieee80211_ptr->wiphy); |
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virt_wifi_cancel_connect(dev); |
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netif_carrier_off(dev); |
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return 0; |
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} |
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static int virt_wifi_net_device_get_iflink(const struct net_device *dev) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev); |
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return priv->lowerdev->ifindex; |
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} |
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static const struct net_device_ops virt_wifi_ops = { |
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.ndo_start_xmit = virt_wifi_start_xmit, |
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.ndo_open = virt_wifi_net_device_open, |
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.ndo_stop = virt_wifi_net_device_stop, |
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.ndo_get_iflink = virt_wifi_net_device_get_iflink, |
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}; |
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/* Invoked as part of rtnl lock release. */ |
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static void virt_wifi_net_device_destructor(struct net_device *dev) |
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{ |
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/* Delayed past dellink to allow nl80211 to react to the device being |
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* deleted. |
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*/ |
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kfree(dev->ieee80211_ptr); |
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dev->ieee80211_ptr = NULL; |
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} |
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/* No lock interaction. */ |
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static void virt_wifi_setup(struct net_device *dev) |
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{ |
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ether_setup(dev); |
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dev->netdev_ops = &virt_wifi_ops; |
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dev->needs_free_netdev = true; |
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} |
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|
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/* Called in a RCU read critical section from netif_receive_skb */ |
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static rx_handler_result_t virt_wifi_rx_handler(struct sk_buff **pskb) |
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{ |
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struct sk_buff *skb = *pskb; |
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struct virt_wifi_netdev_priv *priv = |
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rcu_dereference(skb->dev->rx_handler_data); |
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if (!priv->is_connected) |
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return RX_HANDLER_PASS; |
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/* GFP_ATOMIC because this is a packet interrupt handler. */ |
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skb = skb_share_check(skb, GFP_ATOMIC); |
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if (!skb) { |
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dev_err(&priv->upperdev->dev, "can't skb_share_check\n"); |
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return RX_HANDLER_CONSUMED; |
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} |
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*pskb = skb; |
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skb->dev = priv->upperdev; |
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skb->pkt_type = PACKET_HOST; |
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return RX_HANDLER_ANOTHER; |
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} |
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/* Called with rtnl lock held. */ |
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static int virt_wifi_newlink(struct net *src_net, struct net_device *dev, |
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struct nlattr *tb[], struct nlattr *data[], |
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struct netlink_ext_ack *extack) |
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{ |
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev); |
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int err; |
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if (!tb[IFLA_LINK]) |
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return -EINVAL; |
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netif_carrier_off(dev); |
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priv->upperdev = dev; |
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priv->lowerdev = __dev_get_by_index(src_net, |
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nla_get_u32(tb[IFLA_LINK])); |
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if (!priv->lowerdev) |
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return -ENODEV; |
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if (!tb[IFLA_MTU]) |
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dev->mtu = priv->lowerdev->mtu; |
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else if (dev->mtu > priv->lowerdev->mtu) |
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return -EINVAL; |
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err = netdev_rx_handler_register(priv->lowerdev, virt_wifi_rx_handler, |
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priv); |
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if (err) { |
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dev_err(&priv->lowerdev->dev, |
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"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; |
|
} |
|
|
|
dev->priv_destructor = virt_wifi_net_device_destructor; |
|
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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Driver for a wireless wrapper of ethernet devices"); |
|
MODULE_ALIAS_RTNL_LINK("virt_wifi");
|
|
|