ackflood.trafgen

/* TCP ACK attack ( 64byte )
 * Command example:
 *  trafgen --cpp --dev em2 --conf ackflood.trafgen --verbose
 * Note: dynamic elements "drnd()" make trafgen slower
 */

#define ETH_P_IP	0x0800

#define SYN		(1 << 1)
#define ACK		(1 << 4)
#define ECN		(1 << 6)

{
  /* --- Ethernet Header --- */
  /* NEED ADJUST */
  0x00, 0x12, 0xc0, 0x02, 0xac, 0x56,  # MAC Destination
  0x00, 0x12, 0xc0, drnd(3),  # MAC Source
  
  const16(ETH_P_IP),
  /* IPv4 Version, IHL, TOS */
  0b01000101, 0,
  /* IPv4 Total Len */
  const16(46),
  /* IPv4 Ident */
  drnd(2),
  //const16(2),

  /* IPv4 Flags, Frag Off */
  0b01000000, 0,
  /* IPv4 TTL */
  64,
  /* Proto TCP */
  0x06,
  /* IPv4 Checksum (IP header from, to) */
  csumip(14, 33),

  /* NEED ADJUST */
  10, 10, 88, drnd(1), # Source IP
  10, 10, 88, 172, # Dest IP

  /* TCP Source Port */
  drnd(2),
  /* TCP Dest Port */
  const16(80),
  /* TCP Sequence Number */
  drnd(4),
  /* TCP Ackn. Number */
  drnd(4),

  /* TCP Header length + Flags */
  //const16((0x5 << 12) | SYN | ECN)	/* TCP SYN+ECN Flag */
  //const16((0x5 << 12) | SYN | ACK)	/* TCP SYN+ACK Flag */
  //const16((0x5 << 12) | SYN)		/* TCP SYN Flag */
  const16((0x5 << 12) | ACK)		/* TCP ACK Flag */

  /* Window Size */
  const16(16),
  /* TCP Checksum (offset IP, offset TCP) */
  csumtcp(14, 34),
  const16(0), /*PAD*/
  
  /* Data */
  "ACKswf"
}