Firewall: ICMPv6: accept link-local multicast receiver notification messages.

1 files changed, 4 insertions, 1 deletions

diff --git a/roles/common/templates/etc/nftables.conf.j2 b/roles/common/templates/etc/nftables.conf.j2
index 808383c..cc79671 100755
--- a/roles/common/templates/etc/nftables.conf.j2
+++ b/roles/common/templates/etc/nftables.conf.j2
@@ -47,41 +47,44 @@ flush ruleset
 
 table netdev filter {
 {% for if in ansible_interfaces %}
 {% if if != "lo" and ansible_facts[if].active %}
 {% set addr = (ansible_facts[if].ipv4 | default({'address': '0.0.0.0'})).address %}
     chain INGRESS-{{ if }} {
         type filter hook ingress device {{ if }} priority -499
         policy accept
 
         # IPsec traffic (refined later in the filter rule)
         ip saddr {{ ipsec_subnet }} ip daddr {{ ipsec[inventory_hostname_short] }} meta secpath exists accept
 
         # rate-limiting is done directly by the kernel (net.ipv4.icmp_{ratelimit,ratemask} runtime options)
         icmp   type { echo-reply, echo-request, destination-unreachable, time-exceeded } counter accept
         icmpv6 type { echo-reply, echo-request, destination-unreachable,
                       packet-too-big, time-exceeded, parameter-problem } counter accept
 
         # accept neighbour discovery for autoconfiguration, RFC 4890 sec. 4.4.1
         ip6 hoplimit 255 icmpv6 type { 133,134,135,136,141,142 } counter accept
 
-        # reject all remaining ICMP/ICMPv6 traffic
+        # accept link-local multicast receiver notification messages
+        ip6 saddr fe80::/10 ip6 daddr ff02::/16 ip6 hoplimit 1 icmpv6 type { 130,131,132,143 } counter accept
+
+        # drop all remaining ICMP/ICMPv6 traffic
         meta l4proto { icmp, icmpv6 } drop
 
         # bogon filter (cf. RFC 6890 for non-global ip addresses)
         define bogon = {
             0.0.0.0/8          # this host, on this network (RFC 1122 sec. 3.2.1.3)
 {% if not addr | ipaddr('10.0.0.0/8') %}
           , 10.0.0.0/8         # private-use (RFC 1918)
 {% endif %}
           , 100.64.0.0/10      # shared address space (RFC 6598)
           , 127.0.0.0/8        # loopback (RFC 1122, sec. 3.2.1.3)
           , 169.254.0.0/16     # link local (RFC 3927)
 {% if not addr | ipaddr('172.16.0.0/12') %}
           , 172.16.0.0/12      # private-use (RFC 1918)
 {% endif %}
           , 192.0.0.0/24       # IETF protocol assignments (RFC 6890 sec. 2.1)
           , 192.0.2.0/24       # documentation (RFC 5737)
 {% if not addr | ipaddr('192.168.0.0/16') %}
           , 192.168.0.0/16     # private-use (RFC 1918)
 {% endif %}
           , 198.18.0.0/15      # benchmarking (RFC 2544)