Add comprehensive nftables compiler with shorewall feature parity
Rewrites the compiler from ~440 to ~1700 lines covering all major shorewall
firewall features: loopback, conntrack fast-path, anti-spoof, DHCP, intra-zone,
blacklist/whitelist, conntrack notrack, tunnels (13 types), rules with sections,
DNAT/redirect, SNAT/masquerade, static NAT, policies with zone exclusions,
MSS clamping, rate limiting, connection limiting, negated addresses, ICMP type
matching, TCP RST reject, user/UID matching, mark match/set, NFQUEUE, NONAT,
and policy-level rate/conn limiting.
Adds full config types for all shorewall subsystems (mangle, accounting, maclist,
netmap, providers, tunnels, conntrack, blrules, proxyarp/ndp, routes, tc, secmarks),
shorewall migration tooling, expanded CLI commands, expression-level diff engine,
and 49 unit tests.
unkinben
8d9a76c751