Please, may I ask about the rationale behind the lines 1557 to 1562 in function
udp4_espdecap() of file src/sys/netinet/udp_usrreq.c on FreeBSD
10.2-RELEASE-p3.
…
/*
* We cannot yet update the cksums so clear any
* h/w cksum flags as they are no longer valid.
*/
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)
m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
…
I am specially interested in learning about possibly adverse effects on
operating an IPsec and IPsec-NAT-T enabled kernel when leaving the checksum
flags in place, i.e. removing the above lines from the file
src/sys/netinet/udp_usrreq.c.
Many thanks in advance for any enlightment.
Best regards
Rolf Jansen
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