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cfg80211: support 4-way handshake offloading for WPA/WPA2-PSK

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Let drivers advertise support for station-mode 4-way handshake
offloading with a new NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK flag.

Extend use of NL80211_ATTR_PMK attribute indicating it might be passed
as part of NL80211_CMD_CONNECT command, and contain the PSK (which is
the PMK, hence the name.)

The driver/device is assumed to handle the 4-way handshake by
itself in this case (including key derivations, etc.), instead
of relying on the supplicant.

This patch is somewhat based on this one (by Vladimir Kondratiev):
https://patchwork.kernel.org/patch/1309561/.

Signed-off-by: Vladimir Kondratiev <[email protected]>
Signed-off-by: Eliad Peller <[email protected]>
Signed-off-by: Luca Coelho <[email protected]>
[[email protected] rebase dealing with existing ATTR_PMK]
Signed-off-by: Arend van Spriel <[email protected]>
[reword NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK docs to indicate
that this offload might be required]
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Eliad Peller 2017-06-09 13:08:42 +01:00 • committed by Johannes Berg
commit 91b5ab6289
4 changed files with 32 additions and 2 deletions
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9
net/wireless/nl80211.c
View file

@ -8168,6 +8168,15 @@ static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
memcpy(settings->akm_suites, data, len);
}
if (info->attrs[NL80211_ATTR_PMK]) {
if (nla_len(info->attrs[NL80211_ATTR_PMK]) != WLAN_PMK_LEN)
return -EINVAL;
if (!wiphy_ext_feature_isset(&rdev->wiphy,
NL80211_EXT_FEATURE_4WAY_HANDSHAKE_STA_PSK))
return -EINVAL;
settings->psk = nla_data(info->attrs[NL80211_ATTR_PMK]);
}
return 0;
}