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Allow IP address family to be configured separately for PCP/NAT-PMP and UPnP

ipv6_disable disables IPv6 for both PCP/NAT-PMP and UPnP. Is it possible to allow IP address family to be configured separately for PCP/NAT-PMP and UPnP? The reason is that PCP clients tend to be more compliant than UPnP clients, so while IPv6 often need to be disabled for non-compliant UPnP clients to work properly, PCP clients usually work fine with IPv6.

The configuration could be simplified to 4 booleans, something like enable_pcp_ipv4, enable_pcp_ipv6, enable_upnp_ipv4, enable_upnp_ipv6, this would be the most flexible design that could control IPv4/IPv6 for PCP/NAT-PMP and UPnP independently. The configuration to disable just UPnP IPv6 would be enable_pcp_ipv4=yes enable_pcp_ipv6=yes enable_upnp_ipv4=yes enable_upnp_ipv6=no

Existing options could be implemented as

  • ipv6_disable=yes would be equivalent to enable_pcp_ipv6=no enable_upnp_ipv6=no
  • enable_natpmp=no would be equivalent to enable_pcp_ipv4=no enable_pcp_ipv6=no
  • enable_upnp=no would be equivalent to enable_upnp_ipv4=no enable_upnp_ipv6=no

On a related issue, I don't know how force_igd_desc_v1 works and if IGDv1 for IPv6 exists, I wonder whether it would make sense to have separate IPv4 force_igd_desc_v1 and IPv6 force_igd_desc_v1, the intention is to allow both non-compliant IPv4-only UPnP IGDv1 clients to work properly and compliant IPv6 UPnP IGDv2 clients to use IGDv2 features.