compiler for PF does not need to generate protocol match "proto {tcp
udp icmp}" when service object used in the NAT rule is "any". The
reason this was done this way is lost in the mist of time; it's been
like this since very early versions of fwbuilder.
single object negation in "Inbound Interface" and "Outbound
Interface" columns in compiler for iptables.
* NATCompiler_pf.cpp (compile): see #2456 Added support for single
object negation in "Interface" rule element of PF NAT rules. Now
compiler can produce PF commands such as "nat on ! em0 ... " (for
PF <4.7) or "match on ! em0 ..." (for PF >= 4.7)
* Compiler.cpp (singleObjectNegation::processNext): moved rule
processor that processes single object negation in any rule
element to the base class Compiler.