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restore the data of the ip header when extended udp header and data checksum

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is calculated.  this caused some trouble in the code which the ip header
is not modified.  for example, inbound policy lookup failed.

Obtained from:	KAME
MFC after:	1 week
This commit is contained in:
Hajimu UMEMOTO 2001-10-22 12:43:30 +00:00
parent 7c34d28826
commit cb34210012
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=85315
1 changed files with 3 additions and 0 deletions
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3
sys/netinet/udp_usrreq.c
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@ -225,9 +225,12 @@ udp_input(m, off)
m->m_pkthdr.csum_data + IPPROTO_UDP));
uh->uh_sum ^= 0xffff;
} else {
char b[9];
bcopy(((struct ipovly *)ip)->ih_x1, b, 9);
bzero(((struct ipovly *)ip)->ih_x1, 9);
((struct ipovly *)ip)->ih_len = uh->uh_ulen;
uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
bcopy(b, ((struct ipovly *)ip)->ih_x1, 9);
}
if (uh->uh_sum) {
udpstat.udps_badsum++;