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From: Randall Stewart <rrs@FreeBSD.org>
Date: Fri, 12 Mar 2010 08:10:30 +0000 (UTC)
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Subject: svn commit: r205075 - head/sys/netinet6
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Author: rrs
Date: Fri Mar 12 08:10:30 2010
New Revision: 205075
URL: http://svn.freebsd.org/changeset/base/205075

Log:
  With the recent change of the sctp checksum  to support offload,
  no delayed checksum was added to the ip6 output code. This
  causes cards that do not support SCTP checksum offload to
  have SCTP packets that are IPv6 NOT have the sctp checksum
  performed. Thus you could not communicate with a peer. This
  adds the missing bits to make the checksum happen for these cards.
  
  PR:		144529
  MFC after:	2 weeks

Modified:
  head/sys/netinet6/ip6_output.c

Modified: head/sys/netinet6/ip6_output.c
==============================================================================
--- head/sys/netinet6/ip6_output.c	Fri Mar 12 07:49:10 2010	(r205074)
+++ head/sys/netinet6/ip6_output.c	Fri Mar 12 08:10:30 2010	(r205075)
@@ -66,6 +66,7 @@ __FBSDID("$FreeBSD$");
 #include "opt_inet.h"
 #include "opt_inet6.h"
 #include "opt_ipsec.h"
+#include "opt_sctp.h"
 
 #include <sys/param.h>
 #include <sys/kernel.h>
@@ -102,6 +103,10 @@ __FBSDID("$FreeBSD$");
 #include <netipsec/key.h>
 #include <netinet6/ip6_ipsec.h>
 #endif /* IPSEC */
+#ifdef SCTP
+#include <netinet/sctp.h>
+#include <netinet/sctp_crc32.h>
+#endif
 
 #include <netinet6/ip6protosw.h>
 #include <netinet6/scope6_var.h>
@@ -208,6 +213,9 @@ ip6_output(struct mbuf *m0, struct ip6_p
 	struct route_in6 *ro_pmtu = NULL;
 	int hdrsplit = 0;
 	int needipsec = 0;
+#ifdef SCTP
+	int sw_csum;
+#endif
 #ifdef IPSEC
 	struct ipsec_output_state state;
 	struct ip6_rthdr *rh = NULL;
@@ -829,6 +837,10 @@ again:
 			}
 			m->m_pkthdr.csum_flags |=
 			    CSUM_IP_CHECKED | CSUM_IP_VALID;
+#ifdef SCTP
+			if (m->m_pkthdr.csum_flags & CSUM_SCTP)
+				m->m_pkthdr.csum_flags |= CSUM_SCTP_VALID;
+#endif
 			error = netisr_queue(NETISR_IPV6, m);
 			goto done;
 		} else
@@ -857,6 +869,13 @@ passout:
 	 * 4: if dontfrag == 1 && alwaysfrag == 1
 	 *	error, as we cannot handle this conflicting request
 	 */
+#ifdef SCTP
+	sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
+	if (sw_csum & CSUM_SCTP) {
+		sctp_delayed_cksum(m);
+		sw_csum &= ~CSUM_SCTP;
+	}
+#endif
 	tlen = m->m_pkthdr.len;
 
 	if (opt && (opt->ip6po_flags & IP6PO_DONTFRAG))