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[feature] For OVS-DPDK where iptables isn't available, add NAT rules with OpenFlow #6934

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[feature] For OVS-DPDK where iptables isn't available, add NAT rules with OpenFlow #6934

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eca7d5d
Update OpenvSwitch.rb
wangguoqin1001 Feb 18, 2025
6fce0b6
Update OpenvSwitch.rb
wangguoqin1001 Feb 26, 2025
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27 changes: 27 additions & 0 deletions src/vnm_mad/remotes/ovswitch/OpenvSwitch.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,9 @@ def activate

# IP-spoofing
ip_spoofing if nic[:filter_ip_spoofing] =~ /yes/i

# NAT for DPDK
nat if nic[:nat_dpdk] =~ /yes/i
end

# MAC-spoofing & IP-spoofing for NIC ALIAS
Expand Down Expand Up @@ -423,6 +426,30 @@ def mac_spoofing
add_flow(base, :drop, 40000)
end

# For OVS-DPDK iptables isn't available, so we have to do NAT in OpenFlow
# Before NAT: VMx (one-x-0) -- Internal (int0)
# After NAT: External (onebr) -- Remote Server
#
# Have to set both source and destination MACs, as well as output to desired interfaces
def nat
nic_br = "onebr"
nic_int = "int0"
nic_ext = "dpdk0"
int_ip_range = "192.168.0.0/16"

gw_ip = `ip route`.each_line.find { |line| line.start_with?("default") }&.split&.[](2)
gw_mac = `ip neigh show`.each_line.find { |line| line.include?(gw_ip)}&.split&.[](4)
br_ip = `ip addr show #{nic_br}`.each_line.find { |line| line =~ /inet (\S+)?\/\d+/ }&.match(/inet (\S+?)\/\d+/)&.[](1)
br_mac = `ip link show #{nic_br}`.each_line.find { |line| line =~ /ether (\S+)/ }&.match(/ether (\S+)/)&.[](1)
int_mac = `ip link show #{nic_int}`.each_line.find { |line| line =~ /ether (\S+)/ }&.match(/ether (\S+)/)&.[](1)

add_flow("table=0, in_port=#{port}, ip, nw_dst=#{int_ip_range}", "resubmit(,10)", 120)
add_flow("table=0, in_port=#{port}, ip", "ct(commit, nat(src=#{br_ip})), mod_dl_src:#{br_mac}, mod_dl_dst:#{gw_mac}, output:#{nic_ext}", 110)
add_flow("table=0, in_port=#{nic_ext}, ip, nw_dst=#{br_ip}", "ct(table=1, nat), NORMAL", 110)
add_flow("table=1, ip, nw_dst=#{@nic[:ip]}", "mod_dl_src:#{int_mac}, mod_dl_dst:#{@nic[:mac]}, output:#{port}", 110)
end


def del_flows
the_ports = ports
in_port = ''
Expand Down