Netfilter kernel module hook at PREROUTING forward packet use ip_forward(sk_buff)

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hi all

a netfilter kernel module hoot at PREROUTING
and forward packet
---------------------------
......

decide outgoing path

......
ip_forward(sk_buff)
return NF_STOLEN
--------------------------

iptables -t mangle -A FORWARD -s 192.168.1.0 -j MARK --set-mark 0xa

traffic never match rule in FORWARD chain
any function can make traffic through FORWARD chain

thanks for any advice
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