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[dns-client] add config to bind socket to thread netif (#12085)

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This commit introduces a new configuration option
`OPENTHREAD_CONFIG_DNS_CLIENT_BIND_UDP_TO_THREAD_NETIF` to control
which network interface the DNS client's UDP socket binds to.

When this config is set to 1, the socket is bound to the Thread
network interface (`Ip6::kNetifThreadInternal`).

When the config is set to 0, the socket is bound to the unspecified
network interface (`Ip6::kNetifUnspecified`), allowing DNS messages
to be sent and received over any available network interface. By
default this new config is disabled.

A new CMake option `OT_DNS_CLIENT_BIND_UDP_THREAD_NETIF` is also added
to allow easy configuration of this feature.

The test configurations are updated to ensure both behaviors are
covered.
This commit is contained in:
Abtin Keshavarzian
2025-11-08 11:02:07 -08:00
committed by GitHub
parent 75c5d220de
commit ced33033e9
5 changed files with 24 additions and 3 deletions
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etc/cmake/options.cmake
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@@ -204,6 +204,7 @@ ot_option(OT_DHCP6_CLIENT OPENTHREAD_CONFIG_DHCP6_CLIENT_ENABLE "DHCP6 client")
ot_option(OT_DHCP6_SERVER OPENTHREAD_CONFIG_DHCP6_SERVER_ENABLE "DHCP6 server")
ot_option(OT_DIAGNOSTIC OPENTHREAD_CONFIG_DIAG_ENABLE "diagnostic")
ot_option(OT_DNS_CLIENT OPENTHREAD_CONFIG_DNS_CLIENT_ENABLE "DNS client")
ot_option(OT_DNS_CLIENT_BIND_UDP_THREAD_NETIF OPENTHREAD_CONFIG_DNS_CLIENT_BIND_UDP_TO_THREAD_NETIF "bind DNS client socket to Thread netif")
ot_option(OT_DNS_CLIENT_OVER_TCP OPENTHREAD_CONFIG_DNS_CLIENT_OVER_TCP_ENABLE "Enable dns query over tcp")
ot_option(OT_DNS_DSO OPENTHREAD_CONFIG_DNS_DSO_ENABLE "DNS Stateful Operations (DSO)")
ot_option(OT_DNS_UPSTREAM_QUERY OPENTHREAD_CONFIG_DNS_UPSTREAM_QUERY_ENABLE "Allow sending DNS queries to upstream")