Recalculate min channel context for the given or all interface
links, depending on the caller. For a station state change, we
need to recalculate all of them since we don't know which link
(or multiple) it might be on.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We check here that we don't enable TX (netif_carrier_ok())
before we actually start using some channel context, but to
our knowledge this check has never triggered, and with MLO
it's just wrong since links can be added and removed much
more dynamically than before.

Simply remove the checks, there's no really good way to do
anything that would replace them.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This simplifies hostapd implementation, since it didn't
switch to NL80211_CMD_SET_CHANNEL.
Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Allow link source address on TX.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Allow transmitting EAPOL frames not only from the interface
address (which is the MLD address) but also any link addresses,
in order to support non-MLO stations on AP interfaces.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

In case of authentication with a legacy station, link addressed EAPOL
frames should be sent. Support it.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Set the MLD parameters in NL80211_CMD_SET_STATION handling
to be able to change an MLD station.
Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We should check that MLO connections are supported before
attempting to authenticate with MLO parameters, check that.

Fixes: d648c230 ("wifi: nl80211: support MLO in auth/assoc")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The way this works is that you add all the element data,
keeping a pointer to the length field of the element.
Then call this helper function, which will fragment the
element if there was more than 255 bytes in the element,
memmove()ing the data back if needed.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For now, skip rate statistics here to avoid warnings in
the called code, we'll need to adjust this to have all
the statistics for link stations.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

If the BSS lookup returned an error, set it to NULL so we
don't try to free it.

Fixes: d648c230 ("wifi: nl80211: support MLO in auth/assoc")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We have the per-interface type capabilities, currently for
extended capabilities, add the EML/MLD capabilities there
to have this advertised by the driver.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

If we add a station on an MLD, we need a link ID to see
where it lives (by default). Validate the link ID against
the valid_links.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When we add non-deflink pointers, we need to remove the
link[0] pointer to deflink in case link[0] is not valid
afterwards. Also, we need to add that back when there
are no more valid links. Reorg the code to fix that.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When we remove a link that doesn't have a channel context,
we don't really need the local->mtx locking. Tighten the
check here.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This was missing earlier, we need to remove links when
interfaces are being destroyed, and we also need to
stop (AP) operations when a link is being destroyed.
Address these issues to remove many warnings that will
otherwise appear in mac80211.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We need to consider the (maximum) size of the EHT element
we'll add for the association request, otherwise we may run
out of space.

Fixes: 820acc81 ("mac80211: Add EHT capabilities to association/probe request")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The functions currently take a link and check data
from it, but this needs to change for MLO. Simplify
the prototypes by passing only the needed arguments.

Remove the regulatory checks, the warnings shouldn't
trigger, and haven't as far as I know.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Rework the sorting of custom elements into the association
request by moving the elements before HT/VHT/HE to each
their own function. While at it, fix the placement of the
ones that should be between VHT and HE.

This doesn't fix the placement of elements that should be
between HE and EHT yet, a similar change might be needed
in the future.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

There's some awkward code that really only exists
because we want to optimize the allocation size,
but that's not really all that necessary.

Refactor the code that adds rates to the association
request frame to have a separate function, removing
the goto.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For MLO, we may not have a full chandef here later, so change
the API to pass only the width.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

To simplify things when we don't have a full chandef,
add ieee80211_chanwidth_rate_flags().
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Here, ext_capa is checked and can only be non-NULL if
assoc_data->ie_len was set before, so the check here
is redundant.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We need to handle the link addresses for station differently,
they will be determined by the association code, stored, and
then applied when the links are actually created on success,
cfg80211 will fill in the right addresses per the data we're
sending back to it.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When parsing a frame containing a multi-BSSID element, we
need to know both the transmitted and non-transmitted BSSID
so we can parse it correctly.

Unfortunately, in quite a number of cases, we got this wrong
and were passing the wrong BSSID or useless information:
 * the mgmt->bssid from a frame is only the transmitted
   BSSID if the frame is a beacon
 * passing just one of the parameters as non-NULL isn't
   useful and ignored

In those case where we need to parse for a specific BSS we
always have a BSS structure pointer, representing the BSS
we need, whether transmitted or not. Thus, pass that pointer
to the parsing function instead of the two BSSIDs.

Also fix two bugs:
 * we need to re-parse all the elements for the other BSS
   when iterating the non-transmitted BSSes in scan
 * we need to parse for the correct BSS when setting up
   the channel data in client code

Fixes: 78ac51f8 ("mac80211: support multi-bssid")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This value should be per link, since a TDLS connection is
only established on a given link.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We're already passing the elems pointer, and have parsed
them from the same frame with exactly the same parameters,
so don't need to do that again.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

When calling start/stop_ap(), mac80211 already has a protected
link_conf pointer. Pass it to the driver, so it shouldn't
handle RCU protection.
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Refactor the element parsing into a version that has
a parameter struct so we can add more parameters more
easily in the future.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Extend the cfg80211_rx_assoc_resp() to cover multiple
BSSes, the AP MLD address and local link addresses
for MLO.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For MLO we'll need a lot more arguments, including all the
BSS pointers and link addresses, so move the data to a struct
to be able to extend it more easily later.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

We only report the BSSID to userspace, so change the
argument from BSS struct pointer to AP address, which
we'll use to carry either the BSSID or AP MLD address.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

There are a few cases where we send an event to cfg80211
manually, but ieee80211_destroy_assoc_data() also handles
the case of abandoning; some cases don't need an event
and success is handled yet differently.

Unify this by providing a single status argument to the
ieee80211_destroy_assoc_data() function and then handling
all the different cases of events (or no events) there.

This will help simplify the code when MLO support is
added.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For MLO, we need the ability to report back multiple BSS
structures to release, as well as the AP MLD address (if
attempting to make an MLO connection).

Unify cfg80211_assoc_timeout() and cfg80211_abandon_assoc()
into a new cfg80211_assoc_failure() that gets a structure
parameter with the necessary data.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The race described by the comment in mac80211 hasn't existed
since the locking rework to use the same lock and for MLO we
need to pass the AP MLD address, so just pass the BSSID or
AP MLD address instead of the BSS struct pointer, and adjust
all the code accordingly.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

For station capabilities, e.g. TWT, we need to use the correct
link station instead of deflink. Switch the code to do that.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

The argument is unused except for NULL checking, but we already
do that anyway, so it's not needed. Remove the argument.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

This requires a few more changes.

While at it, also add a warning to ieee80211_get_sband()
to avoid it being used when there are multiple links.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

If we decide to stop tracking QoS/WMM parameters, then
this should be a per-link decision. Move the flag to
the link instead.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Do the first adjustments in the client-side code to pass
the link pointer (instead of sdata) to most places etc.

This is just preparation, so the real MLO patches become
smaller.

Note that this isn't complete, notably there are still
quite a few references to sta->deflink and sta->sta.deflink.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>