Date: Thu, 6 Dec 2001 20:42:37 -0800 From: Bill Fenner <fenner@research.att.com> To: freebsd@hoolan.org Cc: freebsd-hackers@freebsd.org Subject: Re: UDP checksum error after encapsulating multicast packet Message-ID: <200112070442.UAA08096@windsor.research.att.com>
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[-- Attachment #1 --]
I looked at the larger context and realized that ip_mloopback()
was wrong too. Try this updated patch; it is a superset of the
previous one.
Bill
[-- Attachment #2 --]
Index: ip_output.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_output.c,v
retrieving revision 1.143
diff -u -r1.143 ip_output.c
--- ip_output.c 1 Dec 2001 13:48:16 -0000 1.143
+++ ip_output.c 7 Dec 2001 04:37:33 -0000
@@ -353,6 +363,16 @@
*/
if (!rsvp_on)
imo = NULL;
+ /*
+ * XXX
+ * delayed checksums are not currently
+ * compatible with IP multicast routing
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &=
+ ~CSUM_DELAY_DATA;
+ }
if (ip_mforward(ip, ifp, m, imo) != 0) {
m_freem(m);
goto done;
@@ -1906,6 +2358,17 @@
register struct ip *ip;
struct mbuf *copym;
+ /*
+ * XXX
+ * delayed checksums are not currently
+ * compatible with IP multicast routing.
+ * Can't do this on copym because it may
+ * be shared.
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
copym = m_copy(m, 0, M_COPYALL);
if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
copym = m_pullup(copym, hlen);
@@ -1946,12 +2409,6 @@
copym->m_pkthdr.rcvif = ifp;
ip_input(copym);
#else
- /* if the checksum hasn't been computed, mark it as valid */
- if (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
}
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