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diff --git a/src/shrpx_http3_upstream.h b/src/shrpx_http3_upstream.h
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+++ b/src/shrpx_http3_upstream.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2021 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef SHRPX_HTTP3_UPSTREAM_H
+#define SHRPX_HTTP3_UPSTREAM_H
+
+#include "shrpx.h"
+
+#include <ngtcp2/ngtcp2.h>
+#include <nghttp3/nghttp3.h>
+
+#include "shrpx_upstream.h"
+#include "shrpx_downstream_queue.h"
+#include "quic.h"
+#include "network.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+struct UpstreamAddr;
+
+class Http3Upstream : public Upstream {
+public:
+  Http3Upstream(ClientHandler *handler);
+  virtual ~Http3Upstream();
+
+  virtual int on_read();
+  virtual int on_write();
+  virtual int on_timeout(Downstream *downstream);
+  virtual int on_downstream_abort_request(Downstream *downstream,
+                                          unsigned int status_code);
+  virtual int
+  on_downstream_abort_request_with_https_redirect(Downstream *downstream);
+  virtual int downstream_read(DownstreamConnection *dconn);
+  virtual int downstream_write(DownstreamConnection *dconn);
+  virtual int downstream_eof(DownstreamConnection *dconn);
+  virtual int downstream_error(DownstreamConnection *dconn, int events);
+  virtual ClientHandler *get_client_handler() const;
+
+  virtual int on_downstream_header_complete(Downstream *downstream);
+  virtual int on_downstream_body(Downstream *downstream, const uint8_t *data,
+                                 size_t len, bool flush);
+  virtual int on_downstream_body_complete(Downstream *downstream);
+
+  virtual void on_handler_delete();
+  virtual int on_downstream_reset(Downstream *downstream, bool no_retry);
+
+  virtual void pause_read(IOCtrlReason reason);
+  virtual int resume_read(IOCtrlReason reason, Downstream *downstream,
+                          size_t consumed);
+  virtual int send_reply(Downstream *downstream, const uint8_t *body,
+                         size_t bodylen);
+
+  virtual int initiate_push(Downstream *downstream, const StringRef &uri);
+
+  virtual int response_riovec(struct iovec *iov, int iovcnt) const;
+  virtual void response_drain(size_t n);
+  virtual bool response_empty() const;
+
+  virtual Downstream *on_downstream_push_promise(Downstream *downstream,
+                                                 int32_t promised_stream_id);
+  virtual int
+  on_downstream_push_promise_complete(Downstream *downstream,
+                                      Downstream *promised_downstream);
+  virtual bool push_enabled() const;
+  virtual void cancel_premature_downstream(Downstream *promised_downstream);
+
+  int init(const UpstreamAddr *faddr, const Address &remote_addr,
+           const Address &local_addr, const ngtcp2_pkt_hd &initial_hd,
+           const ngtcp2_cid *odcid, const uint8_t *token, size_t tokenlen);
+
+  int on_read(const UpstreamAddr *faddr, const Address &remote_addr,
+              const Address &local_addr, const ngtcp2_pkt_info &pi,
+              const uint8_t *data, size_t datalen);
+
+  int write_streams();
+
+  int handle_error();
+
+  int handle_expiry();
+  void reset_timer();
+
+  int setup_httpconn();
+  void add_pending_downstream(std::unique_ptr<Downstream> downstream);
+  int recv_stream_data(uint32_t flags, int64_t stream_id, const uint8_t *data,
+                       size_t datalen);
+  int acked_stream_data_offset(int64_t stream_id, uint64_t datalen);
+  int extend_max_stream_data(int64_t stream_id);
+  void extend_max_remote_streams_bidi(uint64_t max_streams);
+  int error_reply(Downstream *downstream, unsigned int status_code);
+  void http_begin_request_headers(int64_t stream_id);
+  int http_recv_request_header(Downstream *downstream, int32_t token,
+                               nghttp3_rcbuf *name, nghttp3_rcbuf *value,
+                               uint8_t flags, bool trailer);
+  int http_end_request_headers(Downstream *downstream, int fin);
+  int http_end_stream(Downstream *downstream);
+  void start_downstream(Downstream *downstream);
+  void initiate_downstream(Downstream *downstream);
+  int shutdown_stream(Downstream *downstream, uint64_t app_error_code);
+  int shutdown_stream_read(int64_t stream_id, uint64_t app_error_code);
+  int http_stream_close(Downstream *downstream, uint64_t app_error_code);
+  void consume(int64_t stream_id, size_t nconsumed);
+  void remove_downstream(Downstream *downstream);
+  int stream_close(int64_t stream_id, uint64_t app_error_code);
+  void log_response_headers(Downstream *downstream,
+                            const std::vector<nghttp3_nv> &nva) const;
+  int http_acked_stream_data(Downstream *downstream, uint64_t datalen);
+  int http_shutdown_stream_read(int64_t stream_id);
+  int http_reset_stream(int64_t stream_id, uint64_t app_error_code);
+  int http_stop_sending(int64_t stream_id, uint64_t app_error_code);
+  int http_recv_data(Downstream *downstream, const uint8_t *data,
+                     size_t datalen);
+  int handshake_completed();
+  int check_shutdown();
+  int start_graceful_shutdown();
+  int submit_goaway();
+  int send_packet(const UpstreamAddr *faddr, const sockaddr *remote_sa,
+                  size_t remote_salen, const sockaddr *local_sa,
+                  size_t local_salen, const ngtcp2_pkt_info &pi,
+                  const uint8_t *data, size_t datalen, size_t gso_size);
+
+  void qlog_write(const void *data, size_t datalen, bool fin);
+  int open_qlog_file(const StringRef &dir, const ngtcp2_cid &scid) const;
+
+  void on_send_blocked(const UpstreamAddr *faddr,
+                       const ngtcp2_addr &remote_addr,
+                       const ngtcp2_addr &local_addr, const ngtcp2_pkt_info &pi,
+                       const uint8_t *data, size_t datalen, size_t gso_size);
+  int send_blocked_packet();
+  void signal_write_upstream_addr(const UpstreamAddr *faddr);
+
+  ngtcp2_conn *get_conn() const;
+
+private:
+  ClientHandler *handler_;
+  ev_timer timer_;
+  ev_timer shutdown_timer_;
+  ev_prepare prep_;
+  int qlog_fd_;
+  ngtcp2_cid hashed_scid_;
+  ngtcp2_conn *conn_;
+  ngtcp2_connection_close_error last_error_;
+  nghttp3_conn *httpconn_;
+  DownstreamQueue downstream_queue_;
+  bool retry_close_;
+  std::vector<uint8_t> conn_close_;
+
+  struct {
+    bool send_blocked;
+    size_t num_blocked;
+    size_t num_blocked_sent;
+    // blocked field is effective only when send_blocked is true.
+    struct {
+      const UpstreamAddr *faddr;
+      Address local_addr;
+      Address remote_addr;
+      ngtcp2_pkt_info pi;
+      const uint8_t *data;
+      size_t datalen;
+      size_t gso_size;
+    } blocked[2];
+    std::unique_ptr<uint8_t[]> data;
+  } tx_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_HTTP3_UPSTREAM_H