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wifi: nl80211: force WLAN_AKM_SUITE_SAE in big endian in NL80211_CMD_EXTERNAL_AUTH

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User-space supplicant (observed at least on wpa_supplicant) historically
parses the NL80211_ATTR_AKM_SUITES from the NL80211_CMD_EXTERNAL_AUTH
message as big endian _only_ when its value is WLAN_AKM_SUITE_SAE, while
processing anything else in host endian. This behavior makes any driver
relying on SAE external auth to switch AKM suite to big endian if it is
WLAN_AKM_SUITE_SAE. A fix bringing compatibility with both endianness
has been brought into wpa_supplicant, however we must keep compatibility
with older versions, while trying to reduce the occurences of this manual
conversion in wireless drivers.

Add the be32 conversion specifically on WLAN_AKM_SUITE_SAE in nl80211 layer
to keep compatibility with older wpa_supplicant versions.

Suggested-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
Link: https://msgid.link/20240215-nl80211_fix_akm_suites_endianness-v1-1-57e902632f9d@bootlin.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Alexis Lothoré 2024-02-15 15:13:52 +01:00 committed by Johannes Berg
parent 32a1bbd3fe
commit 4f4d8be6dc
1 changed files with 18 additions and 1 deletions
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19
net/wireless/nl80211.c
View File

@ -20132,9 +20132,26 @@ int cfg80211_external_auth_request(struct net_device *dev,
if (!hdr)
goto nla_put_failure;
/* Some historical mistakes in drivers <-> userspace interface (notably
* between drivers and wpa_supplicant) led to a big-endian conversion
* being needed on NL80211_ATTR_AKM_SUITES _only_ when its value is
* WLAN_AKM_SUITE_SAE. This is now fixed on userspace side, but for the
* benefit of older wpa_supplicant versions, send this particular value
* in big-endian. Note that newer wpa_supplicant will also detect this
* particular value in big endian still, so it all continues to work.
*/
if (params->key_mgmt_suite == WLAN_AKM_SUITE_SAE) {
if (nla_put_be32(msg, NL80211_ATTR_AKM_SUITES,
cpu_to_be32(WLAN_AKM_SUITE_SAE)))
goto nla_put_failure;
} else {
if (nla_put_u32(msg, NL80211_ATTR_AKM_SUITES,
params->key_mgmt_suite))
goto nla_put_failure;
}
if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
nla_put_u32(msg, NL80211_ATTR_AKM_SUITES, params->key_mgmt_suite) ||
nla_put_u32(msg, NL80211_ATTR_EXTERNAL_AUTH_ACTION,
params->action) ||
nla_put(msg, NL80211_ATTR_BSSID, ETH_ALEN, params->bssid) ||