问如何向iptable原始表添加规则？

EN

/etc/iptables/rules.v4

*raw
:PREROUTING ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
-A PREROUTING -p icmp -m u32 ! --u32 "0x4&0x3fff=0x0" -j DROP
-A PREROUTING -p icmp -m length --length 1492:65535 -j DROP
-A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN FIN,SYN -j DROP
-A PREROUTING -p tcp -m tcp --tcp-flags SYN,RST SYN,RST -j DROP
-A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,PSH,URG -j DROP
-A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN -j DROP
-A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG NONE -j DROP
-A PREROUTING -p tcp -m tcp --tcp-flags FIN,SYN,RST,PSH,ACK,URG FIN,SYN,RST,PSH,ACK,URG -j DROP
COMMIT

/etc/sysconfig/iptables

*raw
:TCPFLAGS - [0:0]

# the two rules below assure that only TCP packets get examined. All others continue into the *filter table.
-A PREROUTING -p tcp -j TCPFLAGS
-A PREROUTING -j ACCEPT

# quickly accept standard handshakes
# ALLOW ACK or ACK/SYN
#-A TCPFLAGS -j ACCEPT
-A TCPFLAGS -p tcp --tcp-flags FIN,ACK,URG,PSH,RST ACK  -j ACCEPT

# allow ACK/FIN with either URG or PSH, or both, or neither
# but SYN and RST can't be set
-A TCPFLAGS -p tcp --tcp-flags FIN,SYN,ACK,RST  ACK,FIN -j ACCEPT

# allow SYN or ACK/SYN
-A TCPFLAGS -p tcp --tcp-flags FIN,SYN,URG,PSH,RST SYN -j ACCEPT

# allow RST or ACK/RST
-A TCPFLAGS -p tcp --tcp-flags FIN,SYN,URG,PSH,RST RST -j ACCEPT

# this rule catches xmas-tree and fin attacks
-A TCPFLAGS -p tcp --tcp-flags FIN     FIN     -j DROP

# this rule catches xmas-tree and syn/rst attacks
-A TCPFLAGS -p tcp --tcp-flags SYN     SYN     -j DROP

# this rule catches null attacks
-A TCPFLAGS -p tcp --tcp-flags ALL     NONE    -j DROP

#-A TCPFLAGS -p tcp -ecn-tcp-cwr -j DROP
# these rules catch bad ack combinations
#-A TCPFLAGS -p tcp --tcp-flags ACK     ACK     -j ACC
-A TCPFLAGS -j ACCEPT

# so, what do we accept for tcp?
# handshakes (ACK/FIN), (ACK/SYN), (SYN), (ACK), (RST), (ACK/RST), and data packets with 
# PSH or URG or FIN or ACK

COMMIT