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nl80211: Document the expectation for NL80211_ATTR_IE in NL80211_CMD_CONNECT
This commit documents the expectation for NL80211_ATTR_IE when included in NL80211_CMD_CONNECT, as following. Driver shall not modify the IEs specified through NL80211_ATTR_IE if NL80211_ATTR_MAC is included. However, if NL80211_ATTR_MAC_HINT is included, these IEs through NL80211_ATTR_IE are specified by the user space based on the best possible BSS selected. Thus, if the driver ends up selecting a different BSS, it can modify these IEs accordingly (e.g. userspace asks the driver to perform PMKSA caching with BSS1 and the driver ends up selecting BSS2 with different PMKSA cache entry. RSNIE has to get updated with the apt PMKID). Signed-off-by: Sunil Dutt <usdutt@codeaurora.org> Link: https://lore.kernel.org/r/1568378504-15179-1-git-send-email-usdutt@codeaurora.org Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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@ -571,6 +571,14 @@
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* set of BSSID,frequency parameters is used (i.e., either the enforcing
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* %NL80211_ATTR_MAC,%NL80211_ATTR_WIPHY_FREQ or the less strict
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* %NL80211_ATTR_MAC_HINT and %NL80211_ATTR_WIPHY_FREQ_HINT).
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* Driver shall not modify the IEs specified through %NL80211_ATTR_IE if
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* %NL80211_ATTR_MAC is included. However, if %NL80211_ATTR_MAC_HINT is
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* included, these IEs through %NL80211_ATTR_IE are specified by the user
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* space based on the best possible BSS selected. Thus, if the driver ends
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* up selecting a different BSS, it can modify these IEs accordingly (e.g.
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* userspace asks the driver to perform PMKSA caching with BSS1 and the
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* driver ends up selecting BSS2 with different PMKSA cache entry; RSNIE
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* has to get updated with the apt PMKID).
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* %NL80211_ATTR_PREV_BSSID can be used to request a reassociation within
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* the ESS in case the device is already associated and an association with
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* a different BSS is desired.
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