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Fixed a bug in previous revision: compute the payload checksum before

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we convert ip_len into a network byte order; in_delayed_cksum() still
expects it in host byte order.

The symtom was the ``in_cksum_skip: out of data by %d'' complaints
from the kernel.

To add to the previous commit log.  These fixes make tcpdump(1) happy
by not complaining about UDP/TCP checksum being bad for looped back
IP multicast when multicast router is deactivated.

Reported by:	Vsevolod Lobko
This commit is contained in:
Ruslan Ermilov 2004-04-07 10:01:39 +00:00
parent 93996f6d58
commit 390cdc6a76
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=128003
1 changed files with 8 additions and 8 deletions
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16
sys/netinet/ip_output.c
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@ -2188,6 +2188,14 @@ ip_mloopback(ifp, m, dst, hlen)
if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
copym = m_pullup(copym, hlen);
if (copym != NULL) {
/* If needed, compute the checksum and mark it as valid. */
if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(copym);
copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
copym->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
copym->m_pkthdr.csum_data = 0xffff;
}
/*
* We don't bother to fragment if the IP length is greater
* than the interface's MTU. Can this possibly matter?
@ -2220,14 +2228,6 @@ ip_mloopback(ifp, m, dst, hlen)
copym->m_pkthdr.rcvif = ifp;
ip_input(copym);
#else
/* If needed, compute the checksum and mark it as valid. */
if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
in_delayed_cksum(copym);
copym->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
copym->m_pkthdr.csum_flags |=
CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
copym->m_pkthdr.csum_data = 0xffff;
}
if_simloop(ifp, copym, dst->sin_family, 0);
#endif
}