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[caclmgrd] Translation of ACL Control Plane rules into iptables comman… #1737

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[caclmgrd] Translation of ACL Control Plane rules into iptables comman… #1737

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61 changes: 35 additions & 26 deletions files/image_config/caclmgrd/caclmgrd
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,32 @@ class ControlPlaneAclManager(object):
if proc.returncode != 0:
log_error("Error running command '{}'".format(cmd))

def parse_int_to_tcp_flags(self, hex_value):
tcp_flags_str = ""
if hex_value & 0x01:
tcp_flags_str += "FIN,"
if hex_value & 0x02:
tcp_flags_str += "SYN,"
if hex_value & 0x04:
tcp_flags_str += "RST,"
if hex_value & 0x08:
tcp_flags_str += "PSH,"
if hex_value & 0x10:
tcp_flags_str += "ACK,"
if hex_value & 0x20:
tcp_flags_str += "URG,"
# iptables doesn't handle the flags below now. It has some special keys for it:
# --ecn-tcp-cwr This matches if the TCP ECN CWR (Congestion Window Received) bit is set.
# --ecn-tcp-ece This matches if the TCP ECN ECE (ECN Echo) bit is set.
# if hex_value & 0x40:
# tcp_flags_str += "ECE,"
# if hex_value & 0x80:
# tcp_flags_str += "CWR,"

# Delete the trailing comma
tcp_flags_str = tcp_flags_str[:-1]
return tcp_flags_str

def get_acl_rules_and_translate_to_iptables_commands(self):
"""
Retrieves current ACL tables and rules from Config DB, translates
Expand Down Expand Up @@ -162,32 +188,15 @@ class ControlPlaneAclManager(object):

rule_cmd += " --dport {}".format(dst_port)

# If there are TCP flags present, append them
if "TCP_FLAGS" in rule_props and rule_props["TCP_FLAGS"]:
tcp_flags = int(rule_props["TCP_FLAGS"], 16)

if tcp_flags > 0:
rule_cmd += " --tcp-flags "

if tcp_flags & 0x01:
rule_cmd += "FIN,"
if tcp_flags & 0x02:
rule_cmd += "SYN,"
if tcp_flags & 0x04:
rule_cmd += "RST,"
if tcp_flags & 0x08:
rule_cmd += "PSH,"
if tcp_flags & 0x10:
rule_cmd += "ACK,"
if tcp_flags & 0x20:
rule_cmd += "URG,"
if tcp_flags & 0x40:
rule_cmd += "ECE,"
if tcp_flags & 0x80:
rule_cmd += "CWR,"

# Delete the trailing comma
rule_cmd = rule_cmd[:-1]
# If there are TCP flags present and ip protocol is TCP, append them
if ip_protocol == "tcp" and "TCP_FLAGS" in rule_props and rule_props["TCP_FLAGS"]:
tcp_flags, tcp_flags_mask = rule_props["TCP_FLAGS"].split("/")

tcp_flags = int(tcp_flags, 16)
tcp_flags_mask = int(tcp_flags_mask, 16)

if tcp_flags_mask > 0:
rule_cmd += " --tcp-flags {mask} {flags}".format(mask = self.parse_int_to_tcp_flags(tcp_flags_mask), flags = self.parse_int_to_tcp_flags(tcp_flags))

# Append the packet action as the jump target
rule_cmd += " -j {}".format(rule_props["PACKET_ACTION"])
Expand Down