rpm: enable CLAT by default on Fedora 45

https://fedoraproject.org/wiki/Changes/IPv6-Mostly_Support_In_NetworkManager

contrib/fedora/rpm/24-clat-auto.conf

@@ -0,0 +1,32 @@
+# CLAT implements the client part of 464XLAT (RFC 6877), an
+# architecture that provides IPv4 connectivity to hosts on IPv6-only
+# networks.
+#
+# The default value for the connection property 'ipv4.clat' is still
+# 'no'. Change it globally to 'auto' (1) so that CLAT gets enabled
+# automatically when the network advertises a PREF64 and there is no
+# native IPv4 configured (either because DHCPv4 option 108 was
+# received or because there is no DHCPv4 server).
+#
+# See: https://fedoraproject.org/wiki/Changes/IPv6-Mostly_Support_In_NetworkManager
+
+# Do not modify this file. You can hide/overwrite this file by
+# creating "/etc/NetworkManager/conf.d/24-clat-auto.conf". You can
+# also add configuration snippets with higher priority that override
+# this setting (see `man 5 NetworkManager.conf`). Most importantly,
+# this snippet only sets default values for the profile. You can
+# explicitly set the value for each profile, so that this default
+# value is not used.
+
+# For example, on a particular profile/network set
+#
+#   $ nmcli connection modify "$PROFILE" ipv4.clat no
+#
+# to disable CLAT. This prevents the default from this file to take
+# effect.
+
+[connection-24-clat-auto]
+ipv4.clat=1
+
+[.config]
+enable=nm-version-min:1.57

contrib/fedora/rpm/NetworkManager.spec

@@ -170,6 +170,7 @@ Source6: 22-wifi-mac-addr.conf
 Source7: 70-nm-connectivity.conf
 Source8: readme-ifcfg-rh.txt
 Source9: readme-ifcfg-rh-migrated.txt
+Source10: 24-clat-auto.conf
 
 #Patch1: 0001-some.patch
 
@@ -726,6 +727,9 @@ cp %{SOURCE7} %{buildroot}%{_sysctldir}
 %if 0%{?fedora} >= 40
 cp %{SOURCE6} %{buildroot}%{nmlibdir}/conf.d/
 %endif
+%if 0%{?fedora} >= 45
+cp %{SOURCE10} %{buildroot}%{nmlibdir}/conf.d/
+%endif
 
 %if %{with ifcfg_warning}
 cp %{SOURCE8} %{buildroot}%{_sysconfdir}/sysconfig/network-scripts
@@ -879,6 +883,9 @@ fi
 %if 0%{?fedora} >= 40
 %{nmlibdir}/conf.d/22-wifi-mac-addr.conf
 %endif
+%if 0%{?fedora} >= 45
+%{nmlibdir}/conf.d/24-clat-auto.conf
+%endif
 %ghost %{_sysconfdir}/%{name}/VPN
 %{_bindir}/nm-online
 %{_libexecdir}/nm-dhcp-helper

contrib/fedora/rpm/build.sh

@@ -143,6 +143,7 @@ SOURCE_CONFIG_WIFI_MAC_ADDR="$(abs_path "$SOURCE_CONFIG_WIFI_MAC_ADDR" "$SCRIPTD
 SOURCE_SYSCTL_RP_FILTER_REDHAT="$(abs_path "$SOURCE_SYSCTL_RP_FILTER_REDHAT" "$SCRIPTDIR/70-nm-connectivity.conf")" || die "invalid \$SOURCE_SYSCTL_RP_FILTER_REDHAT argument"
 SOURCE_README_IFCFG_FILES="$(abs_path "$SOURCE_README_IFCFG_FILES" "$SCRIPTDIR/readme-ifcfg-rh.txt")" || die "invalid \$SOURCE_README_IFCFG_FILES argument"
 SOURCE_README_IFCFG_MIGRATED="$(abs_path "$SOURCE_README_IFCFG_MIGRATED" "$SCRIPTDIR/readme-ifcfg-rh-migrated.txt")" || die "invalid \$SOURCE_README_IFCFG_MIGRATED argument"
+SOURCE_CONFIG_CLAT_AUTO="$(abs_path "$SOURCE_CONFIG_CLAT_AUTO" "$SCRIPTDIR/24-clat-auto.conf")" || die "invalid \$SOURCE_CONFIG_CLAT_AUTO argument"
 
 TEMP="$(mktemp -d "$SCRIPTDIR/NetworkManager.$DATE.XXXXXX")"
 TEMPBASE="$(basename "$TEMP")"
@@ -202,6 +203,7 @@ cp "$SOURCE_CONFIG_WIFI_MAC_ADDR" "$TEMP/SOURCES/22-wifi-mac-addr.conf" || die "
 cp "$SOURCE_SYSCTL_RP_FILTER_REDHAT" "$TEMP/SOURCES/70-nm-connectivity.conf" || die "Could not copy source $SOURCE_SYSCTL_RP_FILTER_REDHAT to $TEMP/SOURCES"
 cp "$SOURCE_README_IFCFG_FILES" "$TEMP/SOURCES/readme-ifcfg-rh.txt" || die "Could not copy source $SOURCE_README_IFCFG_FILES to $TEMP/SOURCES"
 cp "$SOURCE_README_IFCFG_MIGRATED" "$TEMP/SOURCES/readme-ifcfg-rh-migrated.txt" || die "Could not copy source $SOURCE_README_IFCFG_MIGRATED to $TEMP/SOURCES"
+cp "$SOURCE_CONFIG_CLAT_AUTO" "$TEMP/SOURCES/24-clat-auto.conf" || die "Could not copy source $SOURCE_CONFIG_CLAT_AUTO to $TEMP/SOURCES"
 
 write_changelog