feat(firewall): IPv6 in Regeln + NAT (familienbewusstes nft-Rendering) — v1.2.90

Bisher rendete das Template alle Adress-Matches als 'ip saddr/daddr' (v4-only); ein v6-Eintrag hätte 'nft -f' (und damit das ganze Ruleset) gebrochen. Jetzt:
- Adressausdrücke werden je Eintrag als v4/v6 klassifiziert (addrFamily).
- Regeln mit Adressen werden pro Familie als separate nft-Zeile gerendert (ip vs ip6 saddr/daddr); adresslose Regeln bleiben eine familienagnostische Zeile (v4-Verhalten unverändert).
- icmp nur auf v4-, icmpv6 nur auf v6-Zeilen.
- NAT familienbewusst inkl. v6-DNAT-Target [..]:port; gemischte v4/v6-NAT-Regeln werden übersprungen (statt nft -f zu brechen) + geloggt.
- WireGuard site-to-site Masquerade v6-fähig.
Eingabeseite war bereits v6-fähig (validateAddrObjValue/validateRule via net.ParseIP/ParseCIDR; Service-Proto-CHECK erlaubt icmpv6; Builtin PING-v6). Neue Unit-Tests (firewall_ipv6_test.go) inkl. optionalem 'nft -c'-Syntaxcheck.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

internal/firewall/ruleset.nft.tpl

@@ -71,7 +71,7 @@ table inet edgeguard {
                  die Comment-Zeile angehängt — sonst frisst nft die rule
                  als Teil des # Kommentars). */ -}}
         {{""}}
-        {{if .SrcIfaces}}iifname { {{join .SrcIfaces ", "}} } {{end}}{{if .DstIfaces}}oifname { {{join .DstIfaces ", "}} } {{end}}{{if .SrcAddrs}}ip saddr { {{join .SrcAddrs ", "}} } {{end}}{{if .DstAddrs}}ip daddr { {{join .DstAddrs ", "}} } {{end}}{{with .Service}}{{if and (or (eq .Proto "tcp") (eq .Proto "udp")) .PortStart}}{{.Proto}} dport {{.PortStart}}{{if and .PortEnd (ne .PortEnd .PortStart)}}-{{.PortEnd}}{{end}} {{else if eq .Proto "icmp"}}ip protocol icmp {{else if eq .Proto "icmpv6"}}ip6 nexthdr icmpv6 {{end}}{{end}}{{if .Log}}log prefix "edgeguard:{{.RuleID}} " group 0 {{end}}counter {{.Action}} comment "egid:{{.RuleID}}"
+        {{if .SrcIfaces}}iifname { {{join .SrcIfaces ", "}} } {{end}}{{if .DstIfaces}}oifname { {{join .DstIfaces ", "}} } {{end}}{{if .SrcAddrs}}{{.L3}} saddr { {{join .SrcAddrs ", "}} } {{end}}{{if .DstAddrs}}{{.L3}} daddr { {{join .DstAddrs ", "}} } {{end}}{{with .Service}}{{if and (or (eq .Proto "tcp") (eq .Proto "udp")) .PortStart}}{{.Proto}} dport {{.PortStart}}{{if and .PortEnd (ne .PortEnd .PortStart)}}-{{.PortEnd}}{{end}} {{else if eq .Proto "icmp"}}ip protocol icmp {{else if eq .Proto "icmpv6"}}ip6 nexthdr icmpv6 {{end}}{{end}}{{if .Log}}log prefix "edgeguard:{{.RuleID}} " group 0 {{end}}counter {{.Action}} comment "egid:{{.RuleID}}"
 {{end}}
 
         # ── DEFAULT-DROP LOGGING ───────────────────────────────────────
@@ -101,7 +101,7 @@ table inet edgeguard {
         # nach und erlauben new-state-Pakete von dort. Return-Pakete
         # gehen via ct state established schon durch.
 {{range .NATRules}}{{if or (eq .Kind "snat") (eq .Kind "masquerade")}}{{if .SrcCIDR}}
-        ip saddr {{.SrcCIDR}} ct state new accept comment "auto-forward for NAT rule {{.ID}}"
+        {{.L3}} saddr {{.SrcCIDR}} ct state new accept comment "auto-forward for NAT rule {{.ID}}"
 {{end}}{{end}}{{end}}
 
         # Auto-Forward für WireGuard-Server-Interfaces: Peer-to-Peer-
@@ -128,7 +128,7 @@ table inet edgeguard {
         {{""}}
         {{/* nft-Syntax: erst L3-match (ip saddr/daddr), DANN L4 (tcp/udp dport).
              Sonst quittiert der parser '... unexpected ip' an dieser Stelle. */}}
-        {{if .InIfaces}}iifname { {{join .InIfaces ", "}} } {{end}}{{if .SrcCIDR}}ip saddr {{.SrcCIDR}} {{end}}{{if .DstCIDR}}ip daddr {{.DstCIDR}} {{end}}{{if and .Proto (ne .Proto "any")}}{{.Proto}} {{else}}meta l4proto { tcp, udp } {{end}}{{if .DPortStart}}dport {{.DPortStart}}{{if and .DPortEnd (ne .DPortEnd .DPortStart)}}-{{.DPortEnd}}{{end}} {{end}}{{if .TargetAddr}}dnat to {{.TargetAddr}}{{if .TargetPortStart}}:{{.TargetPortStart}}{{if and .TargetPortEnd (ne .TargetPortEnd .TargetPortStart)}}-{{.TargetPortEnd}}{{end}}{{end}}{{end}}
+        {{if .InIfaces}}iifname { {{join .InIfaces ", "}} } {{end}}{{if .SrcCIDR}}{{.L3}} saddr {{.SrcCIDR}} {{end}}{{if .DstCIDR}}{{.L3}} daddr {{.DstCIDR}} {{end}}{{if and .Proto (ne .Proto "any")}}{{.Proto}} {{else}}meta l4proto { tcp, udp } {{end}}{{if .DPortStart}}dport {{.DPortStart}}{{if and .DPortEnd (ne .DPortEnd .DPortStart)}}-{{.DPortEnd}}{{end}} {{end}}{{if .TargetAddr}}dnat to {{.TargetHost}}{{if .TargetPortStart}}:{{.TargetPortStart}}{{if and .TargetPortEnd (ne .TargetPortEnd .TargetPortStart)}}-{{.TargetPortEnd}}{{end}}{{end}}{{end}}
 {{end}}{{end}}
     }
 
@@ -152,16 +152,16 @@ table inet edgeguard {
         # Masquerade schreibt die Source auf die lokale Tunnel-IP um; Return-Traffic
         # findet so den Weg zurück durch den Tunnel.
 {{range .WGSiteMasq}}
-        oifname "{{.Iface}}" ip saddr {{.VPNNet}} masquerade comment "auto: WireGuard site-to-site masquerade {{.Iface}}"
+        oifname "{{.Iface}}" {{.L3}} saddr {{.VPNNet}} masquerade comment "auto: WireGuard site-to-site masquerade {{.Iface}}"
 {{end}}
 {{range .NATRules}}{{if eq .Kind "snat"}}
         # NAT {{.ID}} (snat{{if .Comment}} — {{.Comment}}{{end}})
         {{""}}
-        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}ip saddr {{.SrcCIDR}} {{end}}{{if .TargetAddr}}snat to {{.TargetAddr}}{{end}}
+        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}{{.L3}} saddr {{.SrcCIDR}} {{end}}{{if .TargetAddr}}snat to {{.TargetAddr}}{{end}}
 {{end}}{{if eq .Kind "masquerade"}}
         # NAT {{.ID}} (masquerade{{if .Comment}} — {{.Comment}}{{end}})
         {{""}}
-        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}ip saddr {{.SrcCIDR}} {{end}}masquerade
+        {{if .OutIfaces}}oifname { {{join .OutIfaces ", "}} } {{end}}{{if .SrcCIDR}}{{.L3}} saddr {{.SrcCIDR}} {{end}}masquerade
 {{end}}{{end}}
     }
 }