Index: sys/netinet/tcp_subr.c
===================================================================
--- sys/netinet/tcp_subr.c
+++ sys/netinet/tcp_subr.c
@@ -3457,6 +3457,8 @@
 
 		bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack,
 		    TCP_FUNCTION_NAME_LEN_MAX);
+		bcopy(CC_ALGO(tp)->name, xt->xt_cc,
+		    TCP_CA_NAME_MAX);
 #ifdef TCP_BLACKBOX
 		(void)tcp_log_get_id(tp, xt->xt_logid);
 #endif
Index: sys/netinet/tcp_var.h
===================================================================
--- sys/netinet/tcp_var.h
+++ sys/netinet/tcp_var.h
@@ -754,7 +754,8 @@
 	struct xinpcb	xt_inp;
 	char		xt_stack[TCP_FUNCTION_NAME_LEN_MAX];	/* (s) */
 	char		xt_logid[TCP_LOG_ID_LEN];	/* (s) */
-	int64_t		spare64[8];
+	char		xt_cc[TCP_CA_NAME_MAX];	/* (s) */
+	int64_t		spare64[6];
 	int32_t		t_state;		/* (s,p) */
 	uint32_t	t_flags;		/* (s,p) */
 	int32_t		t_sndzerowin;		/* (s) */