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ipf mistakenly regards UDP packets with a checksum of 0xffff as bad.

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Obtained from:	NetBSD fil.c r1.30, NetBSD PR/54443
MFC after:	3 days
This commit is contained in:
Cy Schubert 2019-09-26 03:09:42 +00:00
parent ee7201a725
commit d096bd7911
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=352737
1 changed files with 4 additions and 1 deletions
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5
sys/contrib/ipfilter/netinet/fil.c
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@ -6730,8 +6730,11 @@ ipf_checkl4sum(fin)
/*NOTREACHED*/
}
if (csump != NULL)
if (csump != NULL) {
hdrsum = *csump;
if (fin->fin_p == IPPROTO_UDP && hdrsum == 0xffff)
hdrsum = 0x0000;
}
if (dosum) {
sum = fr_cksum(fin, fin->fin_ip, fin->fin_p, fin->fin_dp);