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Index: sys/netinet/ip_fastfwd.c
===================================================================
--- sys/netinet/ip_fastfwd.c
+++ sys/netinet/ip_fastfwd.c
@@ -397,6 +397,31 @@
}
/*
+ * Translate Layer 4 inbound checksum offloading flags to outbound
+ */
+ if ((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) ==
+ (CSUM_DATA_VALID | CSUM_PSEUDO_HDR) &&
+ m->m_pkthdr.csum_data == 0xffff) {
+ /* L4 checksum was correct, but it's not present. */
+ switch(ip->ip_p) {
+ case IPPROTO_TCP:
+ m->m_pkthdr.csum_flags |= CSUM_TCP;
+ break;
+ case IPPROTO_UDP:
+ m->m_pkthdr.csum_flags |= CSUM_UDP;
+ break;
+ case IPPROTO_SCTP:
+ m->m_pkthdr.csum_flags |= CSUM_SCTP;
+ break;
+ default:
+ /*
+ * No checksum offloading support
+ */
+ break;
+ }
+ }
+
+ /*
* Check if packet fits MTU or if hardware will fragment for us
*/
if (ro.ro_rt->rt_mtu)

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