Consolidate nftables setup for alpine, debian and ceph roles

roles/debian/files/nftables.conf

@@ -0,0 +1,36 @@
+#!/usr/sbin/nft -f
+
+flush ruleset
+
+table inet filter {
+    chain input {
+        type filter hook input priority filter; policy drop
+
+        ct state vmap { invalid : drop, established : accept, related : accept }
+        iif lo accept
+
+        ip protocol icmp icmp type {
+            echo-request, echo-reply, destination-unreachable,
+            parameter-problem, time-exceeded,
+        } accept comment "accept some ICMPv4"
+
+        ip6 nexthdr icmpv6 icmpv6 type {
+            echo-request, echo-reply, destination-unreachable,
+            packet-too-big, parameter-problem, time-exceeded,
+        } accept comment "accept some ICMPv6"
+
+        ip6 hoplimit 255 ip6 nexthdr icmpv6 icmpv6 type {
+            nd-neighbor-advert, nd-neighbor-solicit, nd-router-advert, nd-router-solicit
+        } accept comment "accept IPv6 neighbor discovery"
+    }
+
+    chain forward {
+        type filter hook forward priority filter; policy drop
+    }
+
+    chain output {
+        type filter hook output priority filter; policy accept
+    }
+}
+
+include "/etc/nftables.d/*.nft"