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Get PLAT prefix from systemd-networkd, if possible

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Makes clatd check if systemd-networkd is aware of any PLAT prefix (which
it may have learned from the PREF64 Router Advertisement option, cf. RFC
8781).

If a prefix is obtained from systemd-network, DNS64-based PLAT prefix
discovery is skipped, as mandated by
https://datatracker.ietf.org/doc/draft-ietf-v6ops-prefer8781/.

However, if the dns64-servers config option is set, clatd will use
DNS64-based PLAT prefix discovery towards the specified servers, and it
will not query systemd-networkd at all.

Closes #32
This commit is contained in:
Tore Anderson
2025-02-14 11:13:26 +01:00
parent b93a5526a5
commit f91d96b991
3 changed files with 85 additions and 11 deletions
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4
Makefile
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@@ -22,8 +22,8 @@ install:
installdeps:
# .deb/apt-get based distros
if test -x "$(APT_GET)"; then $(APT_GET) -y install perl-base perl-modules libnet-ip-perl libnet-dns-perl iproute2 nftables tayga; fi
if test -x "$(APT_GET)"; then $(APT_GET) -y install perl-base perl-modules libnet-ip-perl libnet-dns-perl libjson-perl iproute2 nftables tayga; fi
# .rpm/DNF/YUM-based distros
if test -x "$(DNF_OR_YUM)"; then $(DNF_OR_YUM) -y install perl perl-IPC-Cmd perl-Net-IP perl-Net-DNS perl-File-Temp iproute nftables; fi
if test -x "$(DNF_OR_YUM)"; then $(DNF_OR_YUM) -y install perl perl-IPC-Cmd perl-Net-IP perl-Net-DNS perl-File-Temp perl-JSON iproute nftables; fi
# If necessary, try to install the TAYGA .rpm using dnf/yum. It is unfortunately not available in all .rpm based distros (in particular CentOS/RHEL).
if test -x "$(DNF_OR_YUM)" && test ! -x "$(TAYGA)"; then $(DNF_OR_YUM) -y install tayga || echo "ERROR: Failed to install TAYGA using dnf/yum, the package is probably not included in your distro. Try enabling the EPEL repo <URL: https://fedoraproject.org/wiki/EPEL> and try again, or install TAYGA <URL: http://www.litech.org/tayga> directly from source."; exit 1; fi