D6148.id15728.diff
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	Index: sys/netinet/tcp_syncache.c
	===================================================================
	--- sys/netinet/tcp_syncache.c
	+++ sys/netinet/tcp_syncache.c
	@@ -1505,6 +1505,10 @@
	return (rv);
	}

	+/*
	+ * Send SYN\|ACK to the peer. Either in response to the peer's SYN,
	+ * i.e. m0 != NULL, or upon 3WHS ACK timeout, i.e. m0 == NULL.
	+ */
	static int
	syncache_respond(struct syncache sc, struct syncache_head sch, int locked,
	const struct mbuf *m0)
	@@ -1688,6 +1692,11 @@

	M_SETFIB(m, sc->sc_inc.inc_fibnum);
	m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
	+ /*
	+ * If we have peer's SYN and it has a flowid, then let's assign it to
	+ * our SYN\|ACK. ip6_output() and ip_output() will not assign flowid
	+ * to SYN\|ACK due to lack of inp here.
	+ */
	if (m0 != NULL && M_HASHTYPE_GET(m0) != M_HASHTYPE_NONE) {
	m->m_pkthdr.flowid = m0->m_pkthdr.flowid;
	M_HASHTYPE_SET(m, M_HASHTYPE_GET(m0));