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The current mac80211 WDS (4-address mode) can be used to cover most of the
Multi-AP requirements for Data frames per the WFA Multi-AP Specification v1.0.
When configuring AP/STA interfaces in 4-address mode, they are able to function
as fronthaul AP/backhaul STA of Multi-AP device complying below
Tx, Rx requirements except one missing STA Rx requirement added by this patch.
Multi-AP specification section 14.1 describes the following requirements:
Transmitter requirements
------------------------
1. Fronthaul AP
i) When DA!=RA of backhaul STA, must use 4-address format
ii) When DA==RA of backhaul STA, shall use either 3-address
or 4-address format with RA updated with STA MAC
(mac80211 support 4-address format via AP/VLAN interface)
2. Backhaul STA
i) When SA!=TA of backhaul STA, must use 4-address format
ii) When SA==TA of backhaul STA, shall use either 3-address
or 4-address format with RA updated with AP MAC
(mac80211 support 4-address format via use_4addr)
Receiver requirements
---------------------
1. Fronthaul AP
i) When SA!=TA of backhaul STA, must support receiving 4-address
format frames
ii) When SA==TA of backhaul STA, must support receiving both
3-address and 4-address format frames
(mac80211 support both 3-addr & 4-addr via AP/VLAN interface)
2. Backhaul STA
i) When DA!=RA of backhaul STA, must support receiving 4-address
format frames
ii) When DA==RA of backhaul STA, must support receiving both
3-address and 4-address format frames
(mac80211 support only receiving 4-address format via
use_4addr)
This patch addresses the above Rx requirement (ii) for backhaul STA to receive
unicast (DA==RA) 3-address frames in addition to 4-address frames.
The current design doesn't accept 3-address frames when configured in 4-address
mode (use_4addr). Hence add a check to allow 3-address frames when DA==RA of
backhaul STA (adhering to Table 9-26 of IEEE Std 802.11™-2016).
This case was tested with a bridged station interface when associated with
a non-mac80211 based vendor AP implementation using 3-address frames for WDS.
STA was able to support the Multi-AP Rx requirement when DA==RA. No issues,
no loops seen when tested with mac80211 based AP as well.
Verified and confirmed all other Tx and Rx requirements of AP and STA for
Multi-AP respectively. They all work using the current mac80211-WDS design.
Signed-off-by: Sathishkumar Muruganandam <murugana@codeaurora.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.