Incorrect L4 offset for IP packets with Options field

[aka320]

• IP header length is variable (20 to 60 bytes) due to the options field which is optional.
• So L4 offset is not always fixed at the default offset of 20 bytes (struct iphdr) from the start of IP header.
• Actual L4 offset is derived from IHL field (4 times IHL) in the IP header, which includes the options as well.

[evershalik]

@aka320, can you elaborate the issue a little more. Actuallly I am not getting the specific concern of this issue. Can you tell, which part/code are you specifically talking about. I wanna know more about the issue so that I can have a look on it.

[aka320]

@evershalik Please see the LFN-meeting-recording where I have discussed this issue (starts from 21:25). I have shown the code as well there. Let me know if you have any questions further.