Linux v5.2-rc1 - dns_resolver
# Configuration for DNS Resolver
tristate "DNS Resolver support"
depends on NET && KEYS
Saying Y here will include support for the DNS Resolver key type
which can be used to make upcalls to perform DNS lookups in
DNS Resolver is used to query DNS server for information. Examples
being resolving a UNC hostname element to an IP address for CIFS or
performing a DNS query for AFSDB records so that AFS can locate a
cell's volume location database servers.
DNS Resolver is used by the CIFS and AFS modules, and would support
SMB2 later. DNS Resolver is supported by the userspace upcall
helper "/sbin/dns.resolver" via /etc/request-key.conf.
See <file:Documentation/networking/dns_resolver.txt> for further
To compile this as a module, choose M here: the module will be called
If unsure, say N.