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# mark set ip saddr map { 10.2.3.2 : 0x0000002a, 10.2.3.1 : 0x00000017}
__map%d test-ip4 b
__map%d test-ip4 0
	element 0203020a  : 0000002a 0 [end]	element 0103020a  : 00000017 0 [end]
ip test-ip4 input 
  [ payload load 4b @ network header + 12 => reg 1 ]
  [ lookup reg 1 set __map%d dreg 1 ]
  [ meta set mark with reg 1 ]

# mark set ip hdrlength map { 5 : 0x00000017, 4 : 0x00000001}
__map%d test-ip4 b
__map%d test-ip4 0
	element 00000005  : 00000017 0 [end]	element 00000004  : 00000001 0 [end]
ip test-ip4 input 
  [ payload load 1b @ network header + 0 => reg 1 ]
  [ bitwise reg 1 = (reg=1 & 0x0000000f ) ^ 0x00000000 ]
  [ lookup reg 1 set __map%d dreg 1 ]
  [ meta set mark with reg 1 ]