Index: netinet/tcp_input.c
===================================================================
--- netinet/tcp_input.c
+++ netinet/tcp_input.c
@@ -514,7 +514,7 @@
 	    (tlen <= tp->t_maxseg) &&					\
 	    (V_tcp_delack_enabled || (tp->t_flags & TF_NEEDSYN)))
 
-static void inline
+void inline
 cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos)
 {
 	INP_WLOCK_ASSERT(tp->t_inpcb);
Index: netinet/tcp_stacks/rack.c
===================================================================
--- netinet/tcp_stacks/rack.c
+++ netinet/tcp_stacks/rack.c
@@ -7715,6 +7715,10 @@
 			TCPSTAT_INC(tcps_ecn_ect1);
 			break;
 		}
+
+		/* Process a packet differently from RFC3168. */
+		cc_ecnpkt_handler(tp, th, iptos);
+
 		/* Congestion experienced. */
 		if (thflags & TH_ECE) {
 			rack_cong_signal(tp, th, CC_ECN);
Index: netinet/tcp_var.h
===================================================================
--- netinet/tcp_var.h
+++ netinet/tcp_var.h
@@ -891,6 +891,7 @@
 			    uint16_t nsegs, uint16_t type);
 void 	cc_conn_init(struct tcpcb *tp);
 void 	cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
+void    cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos);
 void	cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
 #ifdef TCP_HHOOK
 void	hhook_run_tcp_est_in(struct tcpcb *tp,