diff --git a/sys/kern/uipc_sockbuf.c b/sys/kern/uipc_sockbuf.c
index 45c69c4b14d4..51874fbbb25b 100644
--- a/sys/kern/uipc_sockbuf.c
+++ b/sys/kern/uipc_sockbuf.c
@@ -451,14 +451,78 @@ sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
 }
 
 int
-sbreserve(struct sockbuf *sb, u_long cc, struct socket *so, 
-    struct thread *td)
+sbsetopt(struct socket *so, int cmd, u_long cc)
 {
+	struct sockbuf *sb;
+	short *flags;
+	u_int *hiwat, *lowat;
 	int error;
 
-	SOCKBUF_LOCK(sb);
-	error = sbreserve_locked(sb, cc, so, td);
-	SOCKBUF_UNLOCK(sb);
+	SOCK_LOCK(so);
+	if (SOLISTENING(so)) {
+		switch (cmd) {
+			case SO_SNDLOWAT:
+			case SO_SNDBUF:
+				lowat = &so->sol_sbsnd_lowat;
+				hiwat = &so->sol_sbsnd_hiwat;
+				flags = &so->sol_sbsnd_flags;
+				break;
+			case SO_RCVLOWAT:
+			case SO_RCVBUF:
+				lowat = &so->sol_sbrcv_lowat;
+				hiwat = &so->sol_sbrcv_hiwat;
+				flags = &so->sol_sbrcv_flags;
+				break;
+		}
+	} else {
+		switch (cmd) {
+			case SO_SNDLOWAT:
+			case SO_SNDBUF:
+				sb = &so->so_snd;
+				break;
+			case SO_RCVLOWAT:
+			case SO_RCVBUF:
+				sb = &so->so_rcv;
+				break;
+		}
+		flags = &sb->sb_flags;
+		hiwat = &sb->sb_hiwat;
+		lowat = &sb->sb_lowat;
+		SOCKBUF_LOCK(sb);
+	}
+
+	error = 0;
+	switch (cmd) {
+	case SO_SNDBUF:
+	case SO_RCVBUF:
+		if (SOLISTENING(so)) {
+			if (cc > sb_max_adj) {
+				error = ENOBUFS;
+				break;
+			}
+			*hiwat = cc;
+			if (*lowat > *hiwat)
+				*lowat = *hiwat;
+		} else {
+			if (!sbreserve_locked(sb, cc, so, curthread))
+				error = ENOBUFS;
+		}
+		if (error == 0)
+			*flags &= ~SB_AUTOSIZE;
+		break;
+	case SO_SNDLOWAT:
+	case SO_RCVLOWAT:
+		/*
+		 * Make sure the low-water is never greater than the
+		 * high-water.
+		 */
+		*lowat = (cc > *hiwat) ? *hiwat : cc;
+		break;
+	}
+
+	if (!SOLISTENING(so))
+		SOCKBUF_UNLOCK(sb);
+	SOCK_UNLOCK(so);
 	return (error);
 }
 
diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
index 55f5cdcd6801..129a0a2842b2 100644
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -461,12 +461,6 @@ sodealloc(struct socket *so)
 	so->so_vnet->vnet_sockcnt--;
 #endif
 	mtx_unlock(&so_global_mtx);
-	if (so->so_rcv.sb_hiwat)
-		(void)chgsbsize(so->so_cred->cr_uidinfo,
-		    &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
-	if (so->so_snd.sb_hiwat)
-		(void)chgsbsize(so->so_cred->cr_uidinfo,
-		    &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
 #ifdef MAC
 	mac_socket_destroy(so);
 #endif
@@ -478,6 +472,12 @@ sodealloc(struct socket *so)
 		if (so->sol_accept_filter != NULL)
 			accept_filt_setopt(so, NULL);
 	} else {
+		if (so->so_rcv.sb_hiwat)
+			(void)chgsbsize(so->so_cred->cr_uidinfo,
+			    &so->so_rcv.sb_hiwat, 0, RLIM_INFINITY);
+		if (so->so_snd.sb_hiwat)
+			(void)chgsbsize(so->so_cred->cr_uidinfo,
+			    &so->so_snd.sb_hiwat, 0, RLIM_INFINITY);
 		sx_destroy(&so->so_snd.sb_sx);
 		sx_destroy(&so->so_rcv.sb_sx);
 		SOCKBUF_LOCK_DESTROY(&so->so_snd);
@@ -2834,38 +2834,7 @@ sosetopt(struct socket *so, struct sockopt *sopt)
 				goto bad;
 			}
 
-			switch (sopt->sopt_name) {
-			case SO_SNDBUF:
-			case SO_RCVBUF:
-				if (sbreserve(sopt->sopt_name == SO_SNDBUF ?
-				    &so->so_snd : &so->so_rcv, (u_long)optval,
-				    so, curthread) == 0) {
-					error = ENOBUFS;
-					goto bad;
-				}
-				(sopt->sopt_name == SO_SNDBUF ? &so->so_snd :
-				    &so->so_rcv)->sb_flags &= ~SB_AUTOSIZE;
-				break;
-
-			/*
-			 * Make sure the low-water is never greater than the
-			 * high-water.
-			 */
-			case SO_SNDLOWAT:
-				SOCKBUF_LOCK(&so->so_snd);
-				so->so_snd.sb_lowat =
-				    (optval > so->so_snd.sb_hiwat) ?
-				    so->so_snd.sb_hiwat : optval;
-				SOCKBUF_UNLOCK(&so->so_snd);
-				break;
-			case SO_RCVLOWAT:
-				SOCKBUF_LOCK(&so->so_rcv);
-				so->so_rcv.sb_lowat =
-				    (optval > so->so_rcv.sb_hiwat) ?
-				    so->so_rcv.sb_hiwat : optval;
-				SOCKBUF_UNLOCK(&so->so_rcv);
-				break;
-			}
+			error = sbsetopt(so, sopt->sopt_name, optval);
 			break;
 
 		case SO_SNDTIMEO:
diff --git a/sys/sys/sockbuf.h b/sys/sys/sockbuf.h
index d22e3bce1645..a4ed33274d79 100644
--- a/sys/sys/sockbuf.h
+++ b/sys/sys/sockbuf.h
@@ -167,8 +167,7 @@ void	sbflush_locked(struct sockbuf *sb);
 void	sbrelease(struct sockbuf *sb, struct socket *so);
 void	sbrelease_internal(struct sockbuf *sb, struct socket *so);
 void	sbrelease_locked(struct sockbuf *sb, struct socket *so);
-int	sbreserve(struct sockbuf *sb, u_long cc, struct socket *so,
-	    struct thread *td);
+int	sbsetopt(struct socket *so, int cmd, u_long cc);
 int	sbreserve_locked(struct sockbuf *sb, u_long cc, struct socket *so,
 	    struct thread *td);
 struct mbuf *