IP options cause IP checksum errors.
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<DIV>Hi,team.</DIV>
<DIV> I used hping3 to send IPv4 packets and found that =
the=20
checksum</DIV>
<DIV>of the packet was incorrect when it carried the option field. After <=
/DIV>
<DIV>analyzing the code, I discovered that our IP checksum calculation</DI=
V>
<DIV>does not consider the length of the options, leading to the </DIV>
<DIV>checksum error. Are we not considering the IP options on purpose, </D=
IV>
<DIV>or is there another consideration?</DIV>
<DIV> </DIV>
<DIV>Test command : </DIV>
<DIV> hping3 -c 1000 -1 -G 10.252.246.164</D=
IV>
<DIV> </DIV>
<DIV>packet:</DIV>
<DIV> </DIV>
<DIV>
<DIV>0000 58 53 c0 56 07 46 cc d8 1f 1b 7e 5e 81 00 00 5c</DIV=
>
<DIV>0010 08 00 45 00 00 76 00 00 40 00 3d 11 5d 33 0a fc</DIV=
>
<DIV>0020 e5 46 0a fc e5 05 e1 5c 12 b5 00 62 84 69 08 00</DIV=
>
<DIV>0030 00 00 00 00 64 00 02 7a 3b 9b c2 2a 58 53 c0 56</DIV=
>
<DIV>0040 07 60 08 00 4f 00 00 44 f0 e4 00 00 3e 01 7e 14</DIV=
>
<DIV>0050 0a fc f7 23 0a fc f6 a4 07 27 0c 01 02 03 04 0a</DIV=
>
<DIV>0060 fc e9 fc 00 00 00 00 00 00 00 00 00 00 00 00 00</DIV=
>
<DIV>0070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00</DIV=
>
<DIV>0080 08 00 3e 2f b9 d0 00 00</DIV>
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<P>Calculation method:</P></DIV></DIV></DIV></DIV></DIV></DIV></DIV>
<DIV> ip->ip_csum =3D csum(ip, sizeof *ip); </DIV></D=
IV>
<DIV> </DIV>
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<DIV><SPAN>
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: verdana; MARGIN: 10px">
<DIV>Jun Wang</DIV></DIV></SPAN></DIV></BODY></HTML>
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