Date: Fri, 25 Jan 2002 23:44:50 -0600 (CST) From: mark tinguely <tinguely@web.cs.ndsu.nodak.edu> To: finlayson@live.com, tinguely@web.cs.ndsu.nodak.edu Cc: freebsd-multimedia@freebsd.org, freebsd-questions@freebsd.org Subject: Re: MBone/mrouted troubles Message-ID: <200201260544.g0Q5ioC34521@web.cs.ndsu.nodak.edu> In-Reply-To: <4.3.1.1.20020125211645.00c7e3a0@localhost>
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I got a request for Bill Fenner's UDP checksum fix for multicast forwarding.
And thought other would like it too. This patch is relative to FreeBSD 4.5RC1's
sys/netinet/ip_output.c. The offsets will differ slightly on FreeBSD 4.4 :
--- ip_output.c.orig Fri Dec 28 04:08:33 2001
+++ ip_output.c Fri Jan 25 09:23:21 2002
@@ -350,6 +350,16 @@
*/
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;
@@ -1887,6 +1897,17 @@
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);
@@ -1927,12 +1948,6 @@
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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