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[caclmgrd]: New traceroute iptables rules #5

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[caclmgrd]: New traceroute iptables rules #5

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8 changes: 4 additions & 4 deletions scripts/caclmgrd
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Original file line number Diff line number Diff line change
Expand Up @@ -641,10 +641,10 @@ class ControlPlaneAclManager(daemon_base.DaemonBase):
# Add iptables commands to block ip2me traffic
iptables_cmds += self.generate_block_ip2me_traffic_iptables_commands(namespace)

# Add iptables/ip6tables commands to allow all incoming packets with TTL of 0 or 1
# This allows the device to respond to tools like tcptraceroute
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -m ttl --ttl-lt 2 -j ACCEPT")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p tcp -m hl --hl-lt 2 -j ACCEPT")
# Add iptables/ip6tables commands to allow traceroute.
# traceroute doesn't need to be accepted, it just needs a reply.
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "iptables -A INPUT -p udp --dport 33434:33523 -j REJECT --reject-with icmp-port-unreachable")
iptables_cmds.append(self.iptables_cmd_ns_prefix[namespace] + "ip6tables -A INPUT -p udp --dport 33434:33523 -j REJECT --reject-with icmp6-port-unreachable")

# Finally, if the device has control plane ACLs configured,
# add iptables/ip6tables commands to drop all other incoming packets
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