MINOR: connection: make conn_stream users also check for per-stream error flag

In a 1:1 connection:stream there's no problem relying on the connection
flags alone to check for errors. But in a mux, it will be possible to mark
certain streams in error without having to mark all of them. An example is
an H2 client sending RST_STREAM frames to abort a long download, or a parse
error requiring to abort only this specific stream.

This commit ensures that stream-interface and checks properly check for
CS_FL_ERROR in cs->flags wherever CO_FL_ERROR was in use. Most likely over
the long term, any check for CO_FL_ERROR will have to disappear.
diff --git a/src/checks.c b/src/checks.c
index aff5ff3..57468e0 100644
--- a/src/checks.c
+++ b/src/checks.c
@@ -596,7 +596,8 @@
 	if (conn && (!errno || errno == EAGAIN))
 		retrieve_errno_from_socket(conn);
 
-	if (conn && !(conn->flags & CO_FL_ERROR) && !expired)
+	if (conn && !(conn->flags & CO_FL_ERROR) &&
+	    !(cs->flags & CS_FL_ERROR) && !expired)
 		return;
 
 	/* we'll try to build a meaningful error message depending on the
@@ -665,7 +666,7 @@
 	}
 	else if ((conn->flags & (CO_FL_CONNECTED|CO_FL_WAIT_L4_CONN)) == CO_FL_WAIT_L4_CONN) {
 		/* L4 not established (yet) */
-		if (conn->flags & CO_FL_ERROR)
+		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 			set_server_check_status(check, HCHK_STATUS_L4CON, err_msg);
 		else if (expired)
 			set_server_check_status(check, HCHK_STATUS_L4TOUT, err_msg);
@@ -679,12 +680,12 @@
 	}
 	else if ((conn->flags & (CO_FL_CONNECTED|CO_FL_WAIT_L6_CONN)) == CO_FL_WAIT_L6_CONN) {
 		/* L6 not established (yet) */
-		if (conn->flags & CO_FL_ERROR)
+		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 			set_server_check_status(check, HCHK_STATUS_L6RSP, err_msg);
 		else if (expired)
 			set_server_check_status(check, HCHK_STATUS_L6TOUT, err_msg);
 	}
-	else if (conn->flags & CO_FL_ERROR) {
+	else if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) {
 		/* I/O error after connection was established and before we could diagnose */
 		set_server_check_status(check, HCHK_STATUS_SOCKERR, err_msg);
 	}
@@ -744,7 +745,7 @@
 
 	if (check->bo->o) {
 		conn->mux->snd_buf(cs, check->bo, 0);
-		if (conn->flags & CO_FL_ERROR) {
+		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) {
 			chk_report_conn_err(check, errno, 0);
 			__cs_stop_both(cs);
 			goto out_wakeup;
@@ -819,9 +820,9 @@
 	done = 0;
 
 	conn->mux->rcv_buf(cs, check->bi, check->bi->size);
-	if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH)) {
+	if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH) || cs->flags & CS_FL_ERROR) {
 		done = 1;
-		if ((conn->flags & CO_FL_ERROR) && !check->bi->i) {
+		if ((conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) && !check->bi->i) {
 			/* Report network errors only if we got no other data. Otherwise
 			 * we'll let the upper layers decide whether the response is OK
 			 * or not. It is very common that an RST sent by the server is
@@ -1328,7 +1329,7 @@
 	SPIN_UNLOCK(SERVER_LOCK, &check->server->lock);
  out_wakeup:
 	/* collect possible new errors */
-	if (conn->flags & CO_FL_ERROR)
+	if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 		chk_report_conn_err(check, 0, 0);
 
 	/* Reset the check buffer... */
@@ -1375,7 +1376,7 @@
 		conn = cs_conn(cs);
 	}
 
-	if (unlikely(conn->flags & CO_FL_ERROR)) {
+	if (unlikely(conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)) {
 		/* We may get error reports bypassing the I/O handlers, typically
 		 * the case when sending a pure TCP check which fails, then the I/O
 		 * handlers above are not called. This is completely handled by the
@@ -2191,7 +2192,7 @@
 				else
 					set_server_check_status(check, HCHK_STATUS_L4OK, NULL);
 			}
-			else if ((conn->flags & CO_FL_ERROR) || expired) {
+			else if ((conn->flags & CO_FL_ERROR) || cs->flags & CS_FL_ERROR || expired) {
 				chk_report_conn_err(check, 0, expired);
 			}
 			else
@@ -2646,7 +2647,7 @@
 
 			__cs_want_send(cs);
 			if (conn->mux->snd_buf(cs, check->bo, 0) <= 0) {
-				if (conn->flags & CO_FL_ERROR) {
+				if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) {
 					chk_report_conn_err(check, errno, 0);
 					__cs_stop_both(cs);
 					goto out_end_tcpcheck;
@@ -2878,9 +2879,9 @@
 
 			__cs_want_recv(cs);
 			if (conn->mux->rcv_buf(cs, check->bi, check->bi->size) <= 0) {
-				if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH)) {
+				if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH) || cs->flags & CS_FL_ERROR) {
 					done = 1;
-					if ((conn->flags & CO_FL_ERROR) && !check->bi->i) {
+					if ((conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR) && !check->bi->i) {
 						/* Report network errors only if we got no other data. Otherwise
 						 * we'll let the upper layers decide whether the response is OK
 						 * or not. It is very common that an RST sent by the server is
@@ -3037,7 +3038,7 @@
 
  out_end_tcpcheck:
 	/* collect possible new errors */
-	if (conn->flags & CO_FL_ERROR)
+	if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 		chk_report_conn_err(check, 0, 0);
 
 	/* cleanup before leaving */
diff --git a/src/mux_pt.c b/src/mux_pt.c
index 2a83eb4..9438d64 100644
--- a/src/mux_pt.c
+++ b/src/mux_pt.c
@@ -82,6 +82,8 @@
 {
 	struct conn_stream *cs = conn->mux_ctx;
 
+	if (conn->flags & CO_FL_ERROR)
+		cs->flags |= CS_FL_ERROR;
 	if (conn_xprt_read0_pending(conn))
 		cs->flags |= CS_FL_EOS;
 	cs->data_cb->recv(cs);
@@ -95,6 +97,8 @@
 {
 	struct conn_stream *cs = conn->mux_ctx;
 
+	if (conn->flags & CO_FL_ERROR)
+		cs->flags |= CS_FL_ERROR;
 	cs->data_cb->send(cs);
 	cs_update_mux_polling(cs);
 }
@@ -138,6 +142,8 @@
 	ret = cs->conn->xprt->rcv_buf(cs->conn, buf, count);
 	if (conn_xprt_read0_pending(cs->conn))
 		cs->flags |= CS_FL_EOS;
+	if (cs->conn->flags & CO_FL_ERROR)
+		cs->flags |= CS_FL_ERROR;
 	return (ret);
 }
 
@@ -155,6 +161,8 @@
 	ret = cs->conn->xprt->rcv_pipe(cs->conn, pipe, count);
 	if (conn_xprt_read0_pending(cs->conn))
 		cs->flags |= CS_FL_EOS;
+	if (cs->conn->flags & CO_FL_ERROR)
+		cs->flags |= CS_FL_ERROR;
 	return (ret);
 }
 
diff --git a/src/stream_interface.c b/src/stream_interface.c
index e9bc831..5b04b8e 100644
--- a/src/stream_interface.c
+++ b/src/stream_interface.c
@@ -435,7 +435,7 @@
 	if (!conn_ctrl_ready(conn))
 		return 0;
 
-	if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH)) {
+	if (conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH) || cs->flags & CS_FL_ERROR) {
 		/* warning, we can't do anything on <conn> after this call ! */
 		si_release_endpoint(si);
 		return -1;
@@ -574,7 +574,7 @@
 	/* First step, report to the stream-int what was detected at the
 	 * connection layer : errors and connection establishment.
 	 */
-	if (conn->flags & CO_FL_ERROR)
+	if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 		si->flags |= SI_FL_ERR;
 
 	/* If we had early data, and the handshake ended, then
@@ -643,7 +643,7 @@
 			oc->pipe = NULL;
 		}
 
-		if (conn->flags & CO_FL_ERROR)
+		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 			return;
 	}
 
@@ -656,7 +656,8 @@
 	/* when we're here, we already know that there is no spliced
 	 * data left, and that there are sendable buffered data.
 	 */
-	if (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_HANDSHAKE)) && !(oc->flags & CF_SHUTW)) {
+	if (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_WR_SH | CO_FL_HANDSHAKE)) &&
+	    !(cs->flags & CS_FL_ERROR) && !(oc->flags & CF_SHUTW)) {
 		/* check if we want to inform the kernel that we're interested in
 		 * sending more data after this call. We want this if :
 		 *  - we're about to close after this last send and want to merge
@@ -991,7 +992,7 @@
 	__cs_want_send(cs);
 
 	si_cs_send(cs);
-	if (cs->conn->flags & CO_FL_ERROR) {
+	if (cs->flags & CS_FL_ERROR || cs->conn->flags & CO_FL_ERROR) {
 		/* Write error on the file descriptor */
 		__cs_stop_both(cs);
 		si->flags |= SI_FL_ERR;
@@ -1085,7 +1086,7 @@
 	 * happens when we send too large a request to a backend server
 	 * which rejects it before reading it all.
 	 */
-	if (conn->flags & CO_FL_ERROR)
+	if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 		return;
 
 	/* maybe we were called immediately after an asynchronous shutr */
@@ -1150,7 +1151,7 @@
 		if (cs->flags & CS_FL_EOS)
 			goto out_shutdown_r;
 
-		if (conn->flags & CO_FL_ERROR)
+		if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 			return;
 
 		if (conn->flags & CO_FL_WAIT_ROOM) {
@@ -1181,7 +1182,8 @@
 	 * that if such an event is not handled above in splice, it will be handled here by
 	 * recv().
 	 */
-	while (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_WAIT_ROOM | CO_FL_HANDSHAKE)) && !(ic->flags & CF_SHUTR)) {
+	while (!(conn->flags & (CO_FL_ERROR | CO_FL_SOCK_RD_SH | CO_FL_WAIT_ROOM | CO_FL_HANDSHAKE)) &&
+	       !(cs->flags & CS_FL_ERROR) && !(ic->flags & CF_SHUTR)) {
 		max = channel_recv_max(ic);
 
 		if (!max) {
@@ -1283,7 +1285,7 @@
 	}
 
  end_recv:
-	if (conn->flags & CO_FL_ERROR)
+	if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 		return;
 
 	if (cs->flags & CS_FL_EOS)
@@ -1311,7 +1313,7 @@
 	struct connection *conn = cs->conn;
 	struct stream_interface *si = cs->data;
 
-	if (conn->flags & CO_FL_ERROR)
+	if (conn->flags & CO_FL_ERROR || cs->flags & CS_FL_ERROR)
 		return;
 
 	if (conn->flags & CO_FL_HANDSHAKE)