Commit 1ecef20c authored by Sathishkumar Muruganandam's avatar Sathishkumar Muruganandam Committed by Johannes Berg

mac80211: add missing WFA Multi-AP backhaul STA Rx requirement

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: default avatarSathishkumar Muruganandam <murugana@codeaurora.org>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent 9cf0a0b4
...@@ -2313,7 +2313,7 @@ __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control) ...@@ -2313,7 +2313,7 @@ __ieee80211_data_to_8023(struct ieee80211_rx_data *rx, bool *port_control)
if (!sdata->u.mgd.use_4addr) if (!sdata->u.mgd.use_4addr)
return -1; return -1;
else else if (!ether_addr_equal(hdr->addr1, sdata->vif.addr))
check_port_control = true; check_port_control = true;
} }
......
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