From: Yonatan Goldschmidt
Date: Sun, 7 Jan 2018 01:26:48 +0200
> IP fragmentation can be performed as expected down the stack, without touching
> irrelevant fields in the included header besides fragment offset, setting
> IP_MF and header checksum.
> If the included header has IP_DF set, EMSGSIZE
IP fragmentation can be performed as expected down the stack, without touching
irrelevant fields in the included header besides fragment offset, setting
IP_MF and header checksum.
If the included header has IP_DF set, EMSGSIZE is returned.
This allows users of IP_HDRINCL to have the kernel perform
