From a9848b9668a819b7d0119590ee4d4f5ed4fbc1d3 Mon Sep 17 00:00:00 2001
From: Daniel Barlow <dan@telent.net>
Date: Wed, 28 Jun 2023 22:20:45 +0100
Subject: [PATCH] firewall: enable incoming ssh and dhcp6

---
 examples/rotuer-firewall.nix | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/examples/rotuer-firewall.nix b/examples/rotuer-firewall.nix
index 7b8b45ff..c8fddcff 100644
--- a/examples/rotuer-firewall.nix
+++ b/examples/rotuer-firewall.nix
@@ -3,6 +3,7 @@ let
   accept = expr : "${expr} accept";
   mcast-scope = 8;
   allow-incoming = false;
+in {
   bogons-ip6 = {
     type = "filter";
     family = "ip6";
@@ -96,6 +97,15 @@ let
       (accept "iifname \"int\" oifname \"ppp0\" ")
     ];
   };
+  input-lan = {
+    type = "filter";
+    family = "ip6";
+
+    rules = [
+      (accept "udp dport 547") # dhcp, could restrict to daddr ff02::1:2
+      (accept "tcp dport 22")
+    ];
+  };
   input-ip6 = {
     type = "filter";
     family = "ip6";
@@ -103,10 +113,12 @@ let
     hook = "input";
     rules = [
       (accept "meta l4proto icmpv6")
+      "iifname int jump input-lan"
       (if allow-incoming
        then accept "oifname \"int\" iifname \"ppp0\""
        else "oifname \"int\" iifname \"ppp0\" jump incoming-allowed-ip6"
       )
+      # how does this even make sense in an input chain?
       (accept "oifname \"int\" iifname \"ppp0\"  ct state established,related")
       (accept "iifname \"int\" oifname \"ppp0\" ")
     ];
@@ -120,6 +132,4 @@ let
       # "oifname \"int\" ip6 daddr 2001:8b0:de3a:40de::e9d tcp dport 22"
     ];
   };
-in {
-  inherit input-ip6 forward-ip6 bogons-ip6 incoming-allowed-ip6;
 }