TUN-6937: Bump golang.org/x/* packages to new release tags

vendor/golang.org/x/net/http2/server.go

@@ -143,7 +143,7 @@ type Server struct {
 }
 
 func (s *Server) initialConnRecvWindowSize() int32 {
-	if s.MaxUploadBufferPerConnection > initialWindowSize {
+	if s.MaxUploadBufferPerConnection >= initialWindowSize {
 		return s.MaxUploadBufferPerConnection
 	}
 	return 1 << 20
@@ -622,7 +622,9 @@ type stream struct {
 	resetQueued      bool        // RST_STREAM queued for write; set by sc.resetStream
 	gotTrailerHeader bool        // HEADER frame for trailers was seen
 	wroteHeaders     bool        // whether we wrote headers (not status 100)
+	readDeadline     *time.Timer // nil if unused
 	writeDeadline    *time.Timer // nil if unused
+	closeErr         error       // set before cw is closed
 
 	trailer    http.Header // accumulated trailers
 	reqTrailer http.Header // handler's Request.Trailer
@@ -948,6 +950,8 @@ func (sc *serverConn) serve() {
 				}
 			case *startPushRequest:
 				sc.startPush(v)
+			case func(*serverConn):
+				v(sc)
 			default:
 				panic(fmt.Sprintf("unexpected type %T", v))
 			}
@@ -1461,6 +1465,21 @@ func (sc *serverConn) processFrame(f Frame) error {
 		sc.sawFirstSettings = true
 	}
 
+	// Discard frames for streams initiated after the identified last
+	// stream sent in a GOAWAY, or all frames after sending an error.
+	// We still need to return connection-level flow control for DATA frames.
+	// RFC 9113 Section 6.8.
+	if sc.inGoAway && (sc.goAwayCode != ErrCodeNo || f.Header().StreamID > sc.maxClientStreamID) {
+
+		if f, ok := f.(*DataFrame); ok {
+			if sc.inflow.available() < int32(f.Length) {
+				return sc.countError("data_flow", streamError(f.Header().StreamID, ErrCodeFlowControl))
+			}
+			sc.sendWindowUpdate(nil, int(f.Length)) // conn-level
+		}
+		return nil
+	}
+
 	switch f := f.(type) {
 	case *SettingsFrame:
 		return sc.processSettings(f)
@@ -1503,9 +1522,6 @@ func (sc *serverConn) processPing(f *PingFrame) error {
 		// PROTOCOL_ERROR."
 		return sc.countError("ping_on_stream", ConnectionError(ErrCodeProtocol))
 	}
-	if sc.inGoAway && sc.goAwayCode != ErrCodeNo {
-		return nil
-	}
 	sc.writeFrame(FrameWriteRequest{write: writePingAck{f}})
 	return nil
 }
@@ -1567,6 +1583,9 @@ func (sc *serverConn) closeStream(st *stream, err error) {
 		panic(fmt.Sprintf("invariant; can't close stream in state %v", st.state))
 	}
 	st.state = stateClosed
+	if st.readDeadline != nil {
+		st.readDeadline.Stop()
+	}
 	if st.writeDeadline != nil {
 		st.writeDeadline.Stop()
 	}
@@ -1592,6 +1611,14 @@ func (sc *serverConn) closeStream(st *stream, err error) {
 
 		p.CloseWithError(err)
 	}
+	if e, ok := err.(StreamError); ok {
+		if e.Cause != nil {
+			err = e.Cause
+		} else {
+			err = errStreamClosed
+		}
+	}
+	st.closeErr = err
 	st.cw.Close() // signals Handler's CloseNotifier, unblocks writes, etc
 	sc.writeSched.CloseStream(st.id)
 }
@@ -1688,16 +1715,6 @@ func (sc *serverConn) processSettingInitialWindowSize(val uint32) error {
 func (sc *serverConn) processData(f *DataFrame) error {
 	sc.serveG.check()
 	id := f.Header().StreamID
-	if sc.inGoAway && (sc.goAwayCode != ErrCodeNo || id > sc.maxClientStreamID) {
-		// Discard all DATA frames if the GOAWAY is due to an
-		// error, or:
-		//
-		// Section 6.8: After sending a GOAWAY frame, the sender
-		// can discard frames for streams initiated by the
-		// receiver with identifiers higher than the identified
-		// last stream.
-		return nil
-	}
 
 	data := f.Data()
 	state, st := sc.state(id)
@@ -1840,19 +1857,27 @@ func (st *stream) copyTrailersToHandlerRequest() {
 	}
 }
 
+// onReadTimeout is run on its own goroutine (from time.AfterFunc)
+// when the stream's ReadTimeout has fired.
+func (st *stream) onReadTimeout() {
+	// Wrap the ErrDeadlineExceeded to avoid callers depending on us
+	// returning the bare error.
+	st.body.CloseWithError(fmt.Errorf("%w", os.ErrDeadlineExceeded))
+}
+
 // onWriteTimeout is run on its own goroutine (from time.AfterFunc)
 // when the stream's WriteTimeout has fired.
 func (st *stream) onWriteTimeout() {
-	st.sc.writeFrameFromHandler(FrameWriteRequest{write: streamError(st.id, ErrCodeInternal)})
+	st.sc.writeFrameFromHandler(FrameWriteRequest{write: StreamError{
+		StreamID: st.id,
+		Code:     ErrCodeInternal,
+		Cause:    os.ErrDeadlineExceeded,
+	}})
 }
 
 func (sc *serverConn) processHeaders(f *MetaHeadersFrame) error {
 	sc.serveG.check()
 	id := f.StreamID
-	if sc.inGoAway {
-		// Ignore.
-		return nil
-	}
 	// http://tools.ietf.org/html/rfc7540#section-5.1.1
 	// Streams initiated by a client MUST use odd-numbered stream
 	// identifiers. [...] An endpoint that receives an unexpected
@@ -1955,6 +1980,9 @@ func (sc *serverConn) processHeaders(f *MetaHeadersFrame) error {
 	// (in Go 1.8), though. That's a more sane option anyway.
 	if sc.hs.ReadTimeout != 0 {
 		sc.conn.SetReadDeadline(time.Time{})
+		if st.body != nil {
+			st.readDeadline = time.AfterFunc(sc.hs.ReadTimeout, st.onReadTimeout)
+		}
 	}
 
 	go sc.runHandler(rw, req, handler)
@@ -2023,9 +2051,6 @@ func (sc *serverConn) checkPriority(streamID uint32, p PriorityParam) error {
 }
 
 func (sc *serverConn) processPriority(f *PriorityFrame) error {
-	if sc.inGoAway {
-		return nil
-	}
 	if err := sc.checkPriority(f.StreamID, f.PriorityParam); err != nil {
 		return err
 	}
@@ -2099,12 +2124,6 @@ func (sc *serverConn) newWriterAndRequest(st *stream, f *MetaHeadersFrame) (*res
 		return nil, nil, sc.countError("bad_path_method", streamError(f.StreamID, ErrCodeProtocol))
 	}
 
-	bodyOpen := !f.StreamEnded()
-	if rp.method == "HEAD" && bodyOpen {
-		// HEAD requests can't have bodies
-		return nil, nil, sc.countError("head_body", streamError(f.StreamID, ErrCodeProtocol))
-	}
-
 	rp.header = make(http.Header)
 	for _, hf := range f.RegularFields() {
 		rp.header.Add(sc.canonicalHeader(hf.Name), hf.Value)
@@ -2117,6 +2136,7 @@ func (sc *serverConn) newWriterAndRequest(st *stream, f *MetaHeadersFrame) (*res
 	if err != nil {
 		return nil, nil, err
 	}
+	bodyOpen := !f.StreamEnded()
 	if bodyOpen {
 		if vv, ok := rp.header["Content-Length"]; ok {
 			if cl, err := strconv.ParseUint(vv[0], 10, 63); err == nil {
@@ -2346,7 +2366,7 @@ func (sc *serverConn) sendWindowUpdate(st *stream, n int) {
 	// a larger Read than this. Very unlikely, but we handle it here
 	// rather than elsewhere for now.
 	const maxUint31 = 1<<31 - 1
-	for n >= maxUint31 {
+	for n > maxUint31 {
 		sc.sendWindowUpdate32(st, maxUint31)
 		n -= maxUint31
 	}
@@ -2466,7 +2486,15 @@ type responseWriterState struct {
 
 type chunkWriter struct{ rws *responseWriterState }
 
-func (cw chunkWriter) Write(p []byte) (n int, err error) { return cw.rws.writeChunk(p) }
+func (cw chunkWriter) Write(p []byte) (n int, err error) {
+	n, err = cw.rws.writeChunk(p)
+	if err == errStreamClosed {
+		// If writing failed because the stream has been closed,
+		// return the reason it was closed.
+		err = cw.rws.stream.closeErr
+	}
+	return n, err
+}
 
 func (rws *responseWriterState) hasTrailers() bool { return len(rws.trailers) > 0 }
 
@@ -2505,6 +2533,10 @@ func (rws *responseWriterState) writeChunk(p []byte) (n int, err error) {
 		rws.writeHeader(200)
 	}
 
+	if rws.handlerDone {
+		rws.promoteUndeclaredTrailers()
+	}
+
 	isHeadResp := rws.req.Method == "HEAD"
 	if !rws.sentHeader {
 		rws.sentHeader = true
@@ -2576,10 +2608,6 @@ func (rws *responseWriterState) writeChunk(p []byte) (n int, err error) {
 		return 0, nil
 	}
 
-	if rws.handlerDone {
-		rws.promoteUndeclaredTrailers()
-	}
-
 	// only send trailers if they have actually been defined by the
 	// server handler.
 	hasNonemptyTrailers := rws.hasNonemptyTrailers()
@@ -2660,23 +2688,85 @@ func (rws *responseWriterState) promoteUndeclaredTrailers() {
 	}
 }
 
+func (w *responseWriter) SetReadDeadline(deadline time.Time) error {
+	st := w.rws.stream
+	if !deadline.IsZero() && deadline.Before(time.Now()) {
+		// If we're setting a deadline in the past, reset the stream immediately
+		// so writes after SetWriteDeadline returns will fail.
+		st.onReadTimeout()
+		return nil
+	}
+	w.rws.conn.sendServeMsg(func(sc *serverConn) {
+		if st.readDeadline != nil {
+			if !st.readDeadline.Stop() {
+				// Deadline already exceeded, or stream has been closed.
+				return
+			}
+		}
+		if deadline.IsZero() {
+			st.readDeadline = nil
+		} else if st.readDeadline == nil {
+			st.readDeadline = time.AfterFunc(deadline.Sub(time.Now()), st.onReadTimeout)
+		} else {
+			st.readDeadline.Reset(deadline.Sub(time.Now()))
+		}
+	})
+	return nil
+}
+
+func (w *responseWriter) SetWriteDeadline(deadline time.Time) error {
+	st := w.rws.stream
+	if !deadline.IsZero() && deadline.Before(time.Now()) {
+		// If we're setting a deadline in the past, reset the stream immediately
+		// so writes after SetWriteDeadline returns will fail.
+		st.onWriteTimeout()
+		return nil
+	}
+	w.rws.conn.sendServeMsg(func(sc *serverConn) {
+		if st.writeDeadline != nil {
+			if !st.writeDeadline.Stop() {
+				// Deadline already exceeded, or stream has been closed.
+				return
+			}
+		}
+		if deadline.IsZero() {
+			st.writeDeadline = nil
+		} else if st.writeDeadline == nil {
+			st.writeDeadline = time.AfterFunc(deadline.Sub(time.Now()), st.onWriteTimeout)
+		} else {
+			st.writeDeadline.Reset(deadline.Sub(time.Now()))
+		}
+	})
+	return nil
+}
+
 func (w *responseWriter) Flush() {
+	w.FlushError()
+}
+
+func (w *responseWriter) FlushError() error {
 	rws := w.rws
 	if rws == nil {
 		panic("Header called after Handler finished")
 	}
+	var err error
 	if rws.bw.Buffered() > 0 {
-		if err := rws.bw.Flush(); err != nil {
-			// Ignore the error. The frame writer already knows.
-			return
-		}
+		err = rws.bw.Flush()
 	} else {
 		// The bufio.Writer won't call chunkWriter.Write
 		// (writeChunk with zero bytes, so we have to do it
 		// ourselves to force the HTTP response header and/or
 		// final DATA frame (with END_STREAM) to be sent.
-		rws.writeChunk(nil)
+		_, err = chunkWriter{rws}.Write(nil)
+		if err == nil {
+			select {
+			case <-rws.stream.cw:
+				err = rws.stream.closeErr
+			default:
+			}
+		}
 	}
+	return err
 }
 
 func (w *responseWriter) CloseNotify() <-chan bool {