Cache the latest v4 and v6 DNS IP string lists in struct netconfig state
to be able to more easily detect changes in those values in future
commits. For that split netconfig_set_dns's code into this function,
which now only commit the values in netconfig->dns{4,6}_list to the
resolver, and netconfig_dns_list_update() which figures out the active
DNS IP address list and saves it in netconfig->dns{4,6} list. This
probably saves some cycles as the callers can now decide to only
recalculate the dns_list which may have changed.
While there simplify netconfig_set_dns return type to void as the result
was always 0 anyway and was never checked by callers.
Cache the latest v4 and v6 gateway IP string in struct netconfig state
to be able to more easily detect changes in those values in future
commits and perhaps to simplify the ..._routes_install functions.
netconfig_ipv4_get_gateway's out_mac parameter can now be NULL. While
editing that function fix a small formatting annoyance.
Use a separate fils variable to make the code a bit prettier.
Also make sure that the out_mac parameter is not NULL prior to storing
the gateway_mac in it.
Add netconfig_enabled() and use that in all places that want to know
whether network configuration is enabled. Drop the enable_network_config
deprecated setting, which was only being handled in one of these 5 or so
places.
This code path was never tested and used to ensure a OWE transition
candidate gets selected over an open one (e.g. if all the BSS's are
blacklisted). But this logic was incorrect and the path was being
taken for BSS's that did not contain the owe_trans element, basically
all BSS's. For RSN's this was somewhat fine since the final check
would set a candidate, but for open BSS's the loop would start over
and potentially complete the loop without ever returning a candidate.
If fallback was false, NULL would be returned.
To fix this only take the OWE transition path if its an OWE transition
BSS, i.e. inverse the logic.
There was no open ssid provisioning file, which was fine as the
first test should have created one. But to be safe, include one
explicitly and use the proper setUp/tearDown functions.
Normally Beacon Reporting subelements are present only if repeated
measurements are requested. However, an all-zero Beacon Reporting
subelement is included by some implementations. Handle this case
similarly to the absent case.
Since Reporting Detail subelement is listed as 'extensible', make sure
that the length check is not overly restrictive. We only interpret the
first field.
It was seen during testing that several offload-capable cards
were not including the OCI in the 4-way handshake. This made
any OCV capable AP unconnectable.
To be safe disable OCV on any cards that support offloading.
802.11 requires an STA initiate the SA Query procedure on channel
switch events. This patch refactors sending the SA Query into its
own routine and starts the procedure when the channel switch event
comes in.
In addition the OCI needs to be verified, so the channel info is
parsed and set into the handshakes chandef.
There are several events for channel switching, and nl80211cmd was
naming two of them "Channel Switch Notify". Change
CH_SWITCH_STARTED_NOTIFY to "Channel Switch Started Notify" to
distinguish the two events.
By sleeping for 4 seconds IWD had plenty of time to fully disconnect
and reconnect in time to pass the final "connected" check. Instead
use wait_for_object_condition to wait for disconnected and expect
this to fail. This will let the test fail if IWD disconnects.
SA query is the final protocol that requires OCI inclusion and
verification. The OCI element is now included and verified in
both request and response frames as required by 802.11.
strcmp behavior is undefined if one of the parameters is NULL.
Server-id is a mandatory value and cannot be NULL. Gateway can be NULL
in DHCP, so check that explicitly.
Reported-by: Andrew Zaborowski <andrew.zaborowski@intel.com>
In certain situations, it is possible for us to know the MAC of the
default gateway when DHCP finishes. This is quite typical on many home
network and small network setups. It is thus possible to pre-populate
the ARP cache with the gateway MAC address to save an extra round trip
at connection time.
Another advantage is during roaming. After version 4.20, linux kernel
flushes ARP caches by default whenever netdev encounters a no carrier
condition (as is the case during roaming). This can prevent packets
from going out after a roam for a significant amount of time due to
lost/delayed ARP responses.
This implements the new handshake callback for setting a TK with
an extended key ID. The procedure is different from legacy zero
index TKs.
First the new TK is set as RX only. Then message 4 should be sent
out (so it uses the existing TK). This poses a slight issue with
PAE sockets since message order is not guaranteed. In this case
the 4th message is stored and sent after the new TK is installed.
Then the new TK is modified using SET_KEY to both send and
receive.
In the case of control port over NL80211 the above can be avoided
and we can simply install the new key, send message 4, and modify
the TK as TX + RX all in sequence, without waiting for any callbacks.
When UseDefaultInterface is set, iwd doesn't attempt to destroy and
recreate any default interfaces it detects. However, only a single
default interface was ever remembered & initialized. This is fine for
most cases since the kernel would typically only create a single netdev
by default.
However, some drivers can create multiple netdevs by default, if
configured to do so. Other usecases, such as tethering, can also
benefit if iwd initialized & managed all default netdevs that were
detected at iwd start time or device hotplug.
oci variable is always set during handshake_util_find_kde. Do not
initialize it unnecessarily to help the compiler / static analysis find
potential issues.
If OCI is not used, then the oci array is never initialized. Do not try
to include it in our GTK 2_of_2 message.
Fixes: ad4d639854 ("eapol: include OCI in GTK 2/2")
802.11 added Extended Key IDs which aim to solve the issue of PTK
key replacement during rekeys. Since swapping out the existing PTK
may result in data loss because there may be in flight packets still
using the old PTK.
Extended Key IDs use two key IDs for the PTK, which toggle between
0 and 1. During a rekey a new PTK is derived which uses the key ID
not already taken by the existing PTK. This new PTK is added as RX
only, then message 4/4 is sent. This ensure message 4 is encrypted
using the previous PTK. Once sent, the new PTK can be modified to
both RX and TX and the rekey is complete.
To handle this in eapol the extended key ID KDE is parsed which
gives us the new PTK key index. Using the new handshake callback
(handshake_state_set_ext_tk) the new TK is installed. The 4th
message is also included as an argument which is taken care of by
netdev (in case waiting for NEW_KEY is required due to PAE socekts).
REKEY_GTK kicks off the GTK only handshake where REKEY_PTK does
both (via the 4-way). The way this utility was written was causing
hostapd some major issues since both REKEY_GTK and REKEY_PTK was
used.
Instead if address is set only do REKEY_PTK. This will also rekey
the GTK via the 4-way handshake.
If no address is set do REKEY_GTK which will only rekey the GTK.
This may not be required but setting the group key mode explicitly
to multicast makes things consistent, even if only for the benefit
of reading iwmon logs easier.
