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iwd/TODO
Ronan Pigott c574c80e27 tree-wide: correct the spelling Ghz -> GHz 
This mispelling was present in the configuration, so I retained parsing
of the legacy BandModifier*Ghz options for compatibility. Without this
change anyone spelling GHz correctly in their configs would be very
confused.
2023-11-07 21:11:50 -06:00

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Background
==========
- Priority scale: High, Medium and Low
- Complexity scale: C1, C2, C4 and C8. The complexity scale is exponential,
with complexity 1 being the lowest complexity. Complexity is a function
of both task 'complexity' and task 'scope'.
The general rule of thumb is that a complexity 1 task should take 1-2 weeks
for a person very familiar with the codebase. Higher complexity tasks
require more time and have higher uncertainty.
Higher complexity tasks should be refined into several lower complexity tasks
once the task is better understood.
mac80211_hwsim
==============
- Add support for HWSIM_CMD_SET_RADIO command
To allow modifying an existing radio, add the HWSIM_CMD_SET_RADIO. The
first possible feature should be to emulate the hardware RFKILL switch.
It might be required to add a HWSIM_ATTR_RADIO_HW_RFKILL attribute flag
to the HWSIM_CMD_NEW_RADIO to enable virtual radios with a hardware
level RFKILL switch.
Priority: Medium
Complexity: C1
- Allow configuration of MAC address or list of MAC addresses
The radios are auto-generating a fake MAC address. It would be useful
to allow specifying a MAC address to be used. In certain cases it might
be also useful to provide a list of MAC addresses so that for example
with secondary interfaces these can be used.
Priority: Low
Complexity: C2
- Move mac80211_hwsim.h header file to UAPI includes
The mac80211_hwsim.h is the public API description of this netlink
interface and thus it should be provided via UAPI includes.
For this work work the mac80211_hwsim.h header needs to be modified
so that it also compiles from userspace. At the moment it throws
errors. And it needs to become part of the UAPI headers of the
Linux kernel.
In addition it should provide HWSIM_GENL_NAME that provides the
generic netlink "MAC82011_HWSIM" family string.
Priority: Low
Complexity: C1
- Provide kernel option to allow defining the number of initial radios
By default the mac80211_hwsim modules creates 2 radios by default unless
it is overwritten with the radios=x module parameter.
To allow loading the mac80211_hwsim by default and even with accidental
loading of the module, it would be good to provide a kernel configuration
option that allows changing the default value here.
For our testing we want to load mac80211_hwsim without any radios. Maybe
this should be the default for the new kernel option.
If the default of initial radios can be changed to zero, then it is also
possible to add MODULE_ALIAS_GENL_FAMILY to support auto-loading of
the mac80211_hwsim kernel module.
Priority: Low
Complexity: C1
- New configuration options for radios
At the moment the radios created are all equal and feature rich. However
for testing we want to create radios with different emulated hardware
capabilities. Provide new attributes or flags that allow enabling or
disabling certain mac80211 features.
For example AP mode, P2P mode, number of interface combinations, TDLS
support, number of Scan SSIDs, supported ciphers and so on.
Priority: Low
Complexity: C2
Wireless monitor
================
- Add support for PACKET_RECV_OUTPUT socket option of AF_PACKET
Instead of having to switch every interface manually into promiscuous
mode, it would be useful to set PACKET_RECV_OUTPUT to receive also
the traffic that leaves the system.
This would make tracing PAE / EAPoL traffic easy and provides better
sniffing capabilities.
Unfortunately, PACKET_RECV_OUTPUT logic is not implemented at all in
the kernel. So, first implement it in the kernel, and then use it in
nlmon.c as a set_sockopt option.
Priority: Low
Complexity: C8
- Subscribe to all nl80211 multicast groups at startup
It seems the nlmon packets are limited to actual subscribed mutlicast
groups. To get a complete picture of all the nl80211 commands and
events, it is required that iwmon adds membership to all multicast
groups that the nl80211 lists.
This means that the netlink socket used for resolving nl80211 family
name needs to be kept open and actively processed since it will also
receive these multicast events. However the event itself can be dropped
since the one from nlmon with the proper kernel level timestamps should
be taken into account.
An alternative is to fix the netlink_deliver_tap() function in the
kernel netlink layer to not be affected by the broadcast filtering.
Priority: Medium
Complexity: C1
- Print the 'group' of the decoded message
Whenever an event / message is received, iwmon should print the genl
group of the message (e.g. mlme, scan, config, regulatory). This will
make it easier to add handling of such events / commands inside iwd.
Priority: Medium
Complexity: C1
Wireless simulator
==================
- Add support for builtin wireless access point emulator
When creating a pair of mac80211_hwsim radios, allow one to operate as
access point. The hwsim utility will emulate the access point on the
second interface for as long as it is running. Which means that from
the first interface it is possible to scan and connect to this access
point using standard wireless tools (including iwd and iwctl).
Code for the AP mode can be shared from iwd feature for access point
operation once that has been implemented.
Priority: Medium
Complexity: C8
Wireless daemon
===============
- Add unit test data with 2nd RSNE in Authenticator 3/4 message
The specification allows the AP to send a second RSN element in its 4-way
handshake message 3/4. Find some test data for this case and create a unit
test case.
Priority: Low
Complexity: C1
- Handle "Use group cipher suite" option for pairwise ciphers
If the AP specifies "Use group cipher suite" as its only pairwise suite, then
handle this appropriately inside EAPoL handshaking code. The install_gtk
callback might need to be modified to handle this case.
Priority: Low
Complexity: C1
- Add support for PMK Caching from 802.11-2007. This is sometimes referred to
as "fast, secure roam back". Essentially the client caches PMKIDs generated
when connecting to various APs. If the client roams back to an AP that has
already been connected to, and the PMK is cached by both, then the 802.1X
exchange can be skipped.
Priority: Low
Complexity: C4
- Add support for Opportunistic Key Caching (OKC). This is not defined by
any 802.11 standards, but is made available by major vendors such as Cisco
and Microsoft.
Priority: Low
Complexity: C4
- Add support for Automatic Power Save Delivery (APSD). This includes
scheduled (s-APSD) and unscheduled (u-APSD). This will require rudimentary
support of WMM protocol. This feature was introduced in 802.11e.
Priority: Low
Complexity: C4
- Add support for Wireless Network Management (WNM) from 802.11v. Parts of
this are needed for Passpoint support.
Priority: Low
Complexity: C8
- Add support for Tunneled Direct Link Setup (TDLS) from 802.11z.
Priority: Medium
Complexity: C8
- Add support for WiFi P2P.
iwd will require a new P2P D-Bus API to be exposed in order for clients to
manage P2P connections. P2P specific logic for device management and
switching between P2P and STA/AP modes for a particular interface will be
required.
Priority: Medium
Complexity: C8
- Add support for EAP-LEAP. This is a Cisco proprietary EAP method that is
quite widespread.
Priority: Medium
Complexity: C4
- Add support for EAP-OTP. OTP stands for 'One Time Password' and can be
found in RFC3784.
Priority: Low
Complexity: C4
- Implement Enrollee Session Overlap Detection after WSC Protocol Run
WSC Best Practices v2.0.1, Section 3.15 describes an enhacement to detect
PBC session overlaps. The Enrollee is asked to perform an extra scan without
the PBC request in the ProbeRequest frames after EAP-WSC completes
successfully. If another AP in PBC mode is found, then a SessionOverlap
error should be reported to the user.
Priority: Low
Complexity: C2
- DPP Support
Device Provisioning Protocol is a new specification from WiFi Alliance.
This allows devices to be provisioned, typically via a QR code.
Priority: Low
Complexity: C8
- Support receiving OCE FILS Discovery Frames
When operating in station mode, we should support receiving of FILS
Discovery frames.
Priority: Medium
Complexity: C2
- Support OCE Reduced Neighbor Reports
OCE specifies that the AP can send Reduced Neighbor Reports if the STA sets
the FILS Capability bit to true. Reduced Neighbor Reports can be used to
replace the need to scan, particularly if the AP reports RNR Completeness
attribute. RNRs can be sent in Probe Responses, Beacons and FILS Discovery
frames.
Priority: Medium
Complexity: C2
- Support OCE Scanning
OCE Specifies various scanning optimizations. When OCE scanning is enabled,
(e.g. when OCE APs are detected, or via some other means), enable the
relevant optimizations if driver support is present:
NL80211_SCAN_FLAG_FILS_MAX_CHANNEL_TIME
NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP
NL80211_SCAN_FLAG_OCE_PROBE_REQ_HIGH_TX_RATE
NL80211_SCAN_FLAG_OCE_PROBE_REQ_DEFERRAL_SUPPRESSION
Priority: Medium
Complexity: C2
- Support OCE mutually non-overlapping channels optimization.
OCE Section 3.10 mandates that the STA should scan channels 1, 6 and 11 in
the 2.4GHz band first, unless it expects to find an AP on a different
channel.
Priority: Low
Complexity: C1
- Support OCE RSSI-based Association Rejection attribute
OCE APs can reject a Re(Association) request with Status Code 34 and
optionally include RSSI-based Association Rejection attribute. This
attribute can either contain a time delay information or an RSSI delta
value. If the time delay info is included, make sure that this particular
BSS is blacklisted only for the duration of the delay. If RSSI delta
is included, make sure to handle that as well.
Priority: Low
Complexity: C1
- Support additional metrics sent by OCE APs
OCE APs can send BSS Load and Extended BSS Load IEs. iwd already takes the
BSS Load IE into account for ranking purposes. If Extended BSS Load IE is
present, it should be taken into account as well.
Additionally, Estimated Service Parameter (ESP) and Reduced WAN Metrics
should be taken into account if available.
Priority: Low
Complexity: C4
- Support OCE FILS Indication element
OCE APs that support FILS authentication can notify which domains they
support. This information is made available using the FILS Indication
element as part of the Probe Response and Beacon frames.
Priority: Low
Complexity: C4
- Support OCE Higher Layer Protocol Encapsulation
This can be used to obtain DHCPv4 address faster.
Priority: Medium
Complexity: C4
Network Configuration
=====================
- Support elements of RFC4436 - DNAv4
Assumption: netconfig is able to save lease information for networks that
have been joined previously and does not release the lease when the network
is left temporarily.
Attempt to re-assume the lease via methods described in DNAv4 if we attempt
to rejoin a network and the lease has not expired yet.
Priority: Low
Complexity: C4
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