mirror of
https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-11-24 08:29:25 +01:00
47 lines
2.2 KiB
Plaintext
47 lines
2.2 KiB
Plaintext
Hotspot 2.0 networks are common in airports/airplanes (e.g. Boingo) and are also
|
|
found in various other locations implemented by cable/cellular providers. These
|
|
networks allow you to use a secure 8021x access point using the account
|
|
credentials for your e.g. cable/cellular provider, or via a dedicated account
|
|
like Boingo. Lots of these services also allow you to roam between networks.
|
|
|
|
The underlying authentication is standard WPA2-Enterprise but Hotspot 2.0 adds a
|
|
'discovery' stage to identifiying networks. This discovery is done using ANQP,
|
|
which queries the network for additional information to determine if the client
|
|
has the credentials to connect.
|
|
|
|
Because of this network identification capability the hotspot network must be
|
|
provisioned before hand as you would with 8021x, though the provisioning file
|
|
requires at least one additional value in addition to the regular 8021x EAP
|
|
information. Under the Hotspot group NAIRealmNames and HESSID have
|
|
been added. NAIRealmNames is a required field. HESSID is optional but, if
|
|
provided, may allow IWD to skip the ANQP step and directly connect (assuming
|
|
the network advertised HESSID matches).
|
|
|
|
NAIRealmNames is a comma separated list of realms e.g.
|
|
|
|
[Hotspot]
|
|
NAIRealmNames=realm.example.com,another.realm.com
|
|
|
|
HESSID is simply a MAC address e.g.
|
|
|
|
[Hotspot]
|
|
HESSID=ab:cd:ef:01:23:67
|
|
|
|
A side note:
|
|
|
|
Since hotspot's use of ANQP is done before we are connected, it is done via
|
|
public action frames. This requires the WiFi hardware go offchannel, similar
|
|
to scans. Because of this scans and ANQP are done on a first come first serve
|
|
basis in the kernel, which can result in delays. To mitigate this IWD will
|
|
suspend any scanning until ANQP finishes. There is also a new feature in the
|
|
5.3 kernel which notifies userspace when a 'remain-on-channel' action has
|
|
completed. This feature is only available on mac80211 based driver and is
|
|
required for IWD to do ANQP reliably.
|
|
|
|
Since not all kernels will have this option right away an option was added to
|
|
IWD which allows the user to disable ANQP. As a result, this will also disable
|
|
any hotspot 2.0 network connections unless the HESSID is provided in the
|
|
configuration file. By default ANQP will be disabled. It can be enabled with:
|
|
|
|
DisableANQP=0
|