From a89c8ae3a9bdf3183da941f35222ecbac0fc7ccf Mon Sep 17 00:00:00 2001
From: bluhm <bluhm@openbsd.org>
Date: Mon, 22 Jan 2018 20:27:28 +0000
Subject: [PATCH] Bring back the detach messages in trpt(8) for tcp debugging. 
 They got lost with the pr_detach conversion.  While there, remove some dead
 code. OK mpi@

---
 sys/netinet/tcp_usrreq.c | 26 +++++++++++---------------
 sys/sys/protosw.h        |  3 ++-
 2 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/sys/netinet/tcp_usrreq.c b/sys/netinet/tcp_usrreq.c
index cc2b23e0661..c534f0eb2b7 100644
--- a/sys/netinet/tcp_usrreq.c
+++ b/sys/netinet/tcp_usrreq.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: tcp_usrreq.c,v 1.163 2018/01/09 15:14:23 mpi Exp $	*/
+/*	$OpenBSD: tcp_usrreq.c,v 1.164 2018/01/22 20:27:28 bluhm Exp $	*/
 /*	$NetBSD: tcp_usrreq.c,v 1.20 1996/02/13 23:44:16 christos Exp $	*/
 
 /*
@@ -170,9 +170,8 @@ tcp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
 	if (inp) {
 		tp = intotcpcb(inp);
 		/* tp might get 0 when using socket splicing */
-		if (tp == NULL) {
+		if (tp == NULL)
 			return (0);
-		}
 #ifdef KPROF
 		tcp_acounts[tp->t_state][req]++;
 #endif
@@ -628,21 +627,16 @@ tcp_detach(struct socket *so)
 		error = so->so_error;
 		if (error == 0)
 			error = EINVAL;
-
 		return (error);
 	}
-	if (inp) {
-		tp = intotcpcb(inp);
-		/* tp might get 0 when using socket splicing */
-		if (tp == NULL) {
-			return (0);
-		}
+	tp = intotcpcb(inp);
+	/* tp might get 0 when using socket splicing */
+	if (tp == NULL)
+		return (0);
 #ifdef KPROF
-		tcp_acounts[tp->t_state][req]++;
+	tcp_acounts[tp->t_state][req]++;
 #endif
-		ostate = tp->t_state;
-	} else
-		ostate = 0;
+	ostate = tp->t_state;
 
 	/*
 	 * Detach the TCP protocol from the socket.
@@ -651,8 +645,10 @@ tcp_detach(struct socket *so)
 	 * which may finish later; embryonic TCB's can just
 	 * be discarded here.
 	 */
-	tcp_disconnect(tp);
+	tp = tcp_disconnect(tp);
 
+	if (tp && (so->so_options & SO_DEBUG))
+		tcp_trace(TA_USER, ostate, tp, (caddr_t)0, PRU_DETACH, 0);
 	return (error);
 }
 
diff --git a/sys/sys/protosw.h b/sys/sys/protosw.h
index 5683bfa9f81..dac57277d7a 100644
--- a/sys/sys/protosw.h
+++ b/sys/sys/protosw.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: protosw.h,v 1.28 2017/11/23 13:45:46 mpi Exp $	*/
+/*	$OpenBSD: protosw.h,v 1.29 2018/01/22 20:27:28 bluhm Exp $	*/
 /*	$NetBSD: protosw.h,v 1.10 1996/04/09 20:55:32 cgd Exp $	*/
 
 /*-
@@ -121,6 +121,7 @@ struct protosw {
  * A non-zero return from usrreq gives an
  * UNIX error number which should be passed to higher level software.
  */
+#define	PRU_DETACH		1	/* detach protocol from up */
 #define	PRU_BIND		2	/* bind socket to address */
 #define	PRU_LISTEN		3	/* listen for connection */
 #define	PRU_CONNECT		4	/* establish connection to peer */
-- 
2.20.1