Merge branch 'quic'

.github/workflows/build.yml

@@ -11,6 +11,7 @@ jobs:
         os: [ubuntu-20.04, macos-10.15]
         compiler: [gcc, clang]
         buildtool: [autotools, cmake]
+        http3: [http3, no-http3]
 
     steps:
     - uses: actions/checkout@v2
@@ -74,6 +75,42 @@ jobs:
       run: |
         echo 'CC=gcc' >> $GITHUB_ENV
         echo 'CXX=g++' >> $GITHUB_ENV
+    - name: Build quictls/openssl
+      if: matrix.http3 == 'http3'
+      run: |
+        git clone --depth 1 -b OpenSSL_1_1_1k+quic https://github.com/quictls/openssl
+        cd openssl
+        ./config enable-tls1_3 --prefix=$PWD/build
+        make -j$(nproc)
+        make install_sw
+    - name: Build nghttp3
+      if: matrix.http3 == 'http3'
+      run: |
+        git clone https://github.com/ngtcp2/nghttp3
+        cd nghttp3
+        autoreconf -i
+        ./configure --prefix=$PWD/build --enable-lib-only
+        make -j$(nproc) check
+        make install
+    - name: Build ngtcp2
+      if: matrix.http3 == 'http3'
+      run: |
+        git clone https://github.com/ngtcp2/ngtcp2
+        cd ngtcp2
+        autoreconf -i
+        ./configure --prefix=$PWD/build --enable-lib-only PKG_CONFIG_PATH="../openssl/build/lib/pkgconfig"
+        make -j$(nproc) check
+        make install
+    - name: Setup extra environment variables for HTTP/3
+      if: matrix.http3 == 'http3'
+      run: |
+        PKG_CONFIG_PATH="$PWD/openssl/build/lib/pkgconfig:$PWD/nghttp3/build/lib/pkgconfig:$PWD/ngtcp2/build/lib/pkgconfig:$PKG_CONFIG_PATH"
+        LDFLAGS="$LDFLAGS -Wl,-rpath,$PWD/openssl/build/lib"
+
+        echo 'PKG_CONFIG_PATH='"$PKG_CONFIG_PATH" >> $GITHUB_ENV
+        echo 'LDFLAGS='"$LDFLAGS" >> $GITHUB_ENV
+        echo 'EXTRA_AUTOTOOLS_OPTS=--enable-http3' >> $GITHUB_ENV
+        echo 'EXTRA_CMAKE_OPTS=-DENABLE_HTTP3=ON' >> $GITHUB_ENV
     - name: Setup git submodules
       run: |
         git submodule update --init
@@ -81,16 +118,16 @@ jobs:
       if: matrix.buildtool == 'autotools'
       run: |
         autoreconf -i
-        ./configure --enable-werror --with-mruby
+        ./configure --enable-werror --with-mruby $EXTRA_AUTOTOOLS_OPTS
     - name: Configure cmake
       if: matrix.buildtool == 'cmake'
       run: |
-        cmake -DENABLE_WERROR=1 -DWITH_MRUBY=1 -DWITH_NEVERBLEED=1 -DCPPFLAGS="$CPPFLAGS" -DLDFLAGS="$LDFLAGS" .
+        cmake -DENABLE_WERROR=1 -DWITH_MRUBY=1 -DWITH_NEVERBLEED=1 $EXTRA_CMAKE_OPTS -DCPPFLAGS="$CPPFLAGS" -DLDFLAGS="$LDFLAGS" .
     - name: Build nghttp2 with autotools
       if: matrix.buildtool == 'autotools'
       run: |
         make distcheck \
-          DISTCHECK_CONFIGURE_FLAGS="--with-mruby --with-neverbleed --enable-werror CPPFLAGS=\"$CPPFLAGS\" LDFLAGS=\"$LDFLAGS\""
+          DISTCHECK_CONFIGURE_FLAGS="--with-mruby --with-neverbleed --enable-werror $EXTRA_AUTOTOOLS_OPTS CPPFLAGS=\"$CPPFLAGS\" LDFLAGS=\"$LDFLAGS\""
     - name: Build nghttp2 with cmake
       if: matrix.buildtool == 'cmake'
       run: |

CMakeLists.txt

@@ -61,6 +61,9 @@ find_package(OpenSSL 1.0.1)
 find_package(Libev 4.11)
 find_package(Libcares 1.7.5)
 find_package(ZLIB 1.2.3)
+find_package(Libngtcp2 0.0.0)
+find_package(Libngtcp2_crypto_openssl 0.0.0)
+find_package(Libnghttp3 0.0.0)
 if(OPENSSL_FOUND AND LIBEV_FOUND AND ZLIB_FOUND)
   set(ENABLE_APP_DEFAULT ON)
 else()
@@ -182,9 +185,18 @@ if(HAVE_CUNIT)
 endif()
 
 # openssl (for src)
+include(CheckSymbolExists)
 set(HAVE_OPENSSL    ${OPENSSL_FOUND})
 if(OPENSSL_FOUND)
   set(OPENSSL_INCLUDE_DIRS  ${OPENSSL_INCLUDE_DIR})
+  cmake_push_check_state()
+  set(CMAKE_REQUIRED_INCLUDES   "${OPENSSL_INCLUDE_DIR}")
+  set(CMAKE_REQUIRED_LIBRARIES  "${OPENSSL_LIBRARIES}")
+  check_symbol_exists(SSL_is_quic "openssl/ssl.h" HAVE_SSL_IS_QUIC)
+  if(NOT HAVE_SSL_IS_QUIC)
+    message(WARNING "OpenSSL in ${OPENSSL_LIBRARIES} dose not have SSL_is_quic.  HTTP/3 support cannot be enabled")
+  endif()
+  cmake_pop_check_state()
 else()
   set(OPENSSL_INCLUDE_DIRS  "")
   set(OPENSSL_LIBRARIES     "")
@@ -228,6 +240,12 @@ if(ENABLE_APP AND NOT (ZLIB_FOUND AND OPENSSL_FOUND AND LIBEV_FOUND))
   message(FATAL_ERROR "Applications were requested (ENABLE_APP=1) but dependencies are not met.")
 endif()
 
+# HTTP/3 requires quictls/openssl, libngtcp2, libngtcp2_crypto_openssl
+# and libnghttp3.
+if(ENABLE_HTTP3 AND NOT (HAVE_SSL_IS_QUIC AND LIBNGTCP2_FOUND AND LIBNGTCP2_CRYPTO_OPENSSL_FOUND AND LIBNGHTTP3_FOUND))
+  message(FATAL_ERROR "HTTP/3 was requested (ENABLE_HTTP3=1) but dependencies are not met.")
+endif()
+
 # HPACK tools requires jansson
 if(ENABLE_HPACK_TOOLS AND NOT HAVE_JANSSON)
   message(FATAL_ERROR "HPACK tools were requested (ENABLE_HPACK_TOOLS=1) but dependencies are not met.")
@@ -448,6 +466,10 @@ foreach(name
   configure_file("${name}.in" "${name}" @ONLY)
 endforeach()
 
+if(APPLE)
+  add_definitions(-D__APPLE_USE_RFC_3542)
+endif()
+
 include_directories(
   "${CMAKE_CURRENT_BINARY_DIR}" # for config.h
 )
@@ -499,6 +521,9 @@ message(STATUS "summary of build options:
       Libxml2:        ${HAVE_LIBXML2} (LIBS='${LIBXML2_LIBRARIES}')
       Libev:          ${HAVE_LIBEV} (LIBS='${LIBEV_LIBRARIES}')
       Libc-ares:      ${HAVE_LIBCARES} (LIBS='${LIBCARES_LIBRARIES}')
+      Libngtcp2:      ${HAVE_LIBNGTCP2} (LIBS='${LIBNGTCP2_LIBRARIES}')
+      Libngtcp2_crypto_openssl: ${HAVE_LIBNGTCP2_CRYPTO_OPENSSL} (LIBS='${LIBNGTCP2_CRYPTO_OPENSSL_LIBRARIES}')
+      Libnghttp3:     ${HAVE_LIBNGHTTP3} (LIBS='${LIBNGHTTP3_LIBRARIES}')
       Libevent(SSL):  ${HAVE_LIBEVENT_OPENSSL} (LIBS='${LIBEVENT_OPENSSL_LIBRARIES}')
       Jansson:        ${HAVE_JANSSON} (LIBS='${JANSSON_LIBRARIES}')
       Jemalloc:       ${HAVE_JEMALLOC} (LIBS='${JEMALLOC_LIBRARIES}')
@@ -517,6 +542,7 @@ message(STATUS "summary of build options:
       Examples:       ${ENABLE_EXAMPLES}
       Python bindings:${ENABLE_PYTHON_BINDINGS}
       Threading:      ${ENABLE_THREADS}
+      HTTP/3(EXPERIMENTAL): ${ENABLE_HTTP3}
 ")
 if(ENABLE_LIB_ONLY_DISABLED_OTHERS)
   message("Only the library will be built. To build other components "

CMakeOptions.txt

@@ -17,6 +17,7 @@ option(ENABLE_LIB_ONLY  "Build libnghttp2 only.  This is a short hand for -DENAB
 option(ENABLE_STATIC_LIB "Build libnghttp2 in static mode also")
 option(ENABLE_SHARED_LIB "Build libnghttp2 as a shared library" ON)
 option(ENABLE_STATIC_CRT "Build libnghttp2 against the MS LIBCMT[d]")
+option(ENABLE_HTTP3      "Enable HTTP/3 support" OFF)
 
 option(WITH_LIBXML2     "Use libxml2"
   ${WITH_LIBXML2_DEFAULT})

README.rst

@@ -145,6 +145,14 @@ minimizes the risk of private key leakage when serious bug like
 Heartbleed is exploited.  The neverbleed is disabled by default.  To
 enable it, use ``--with-neverbleed`` configure option.
 
+To enable the experimental HTTP/3 support for h2load and nghttpx, the
+following libraries are required:
+
+* `OpenSSL with QUIC support
+  <https://github.com/quictls/openssl/tree/OpenSSL_1_1_1k+quic>`_
+* `ngtcp2 <https://github.com/ngtcp2/ngtcp2>`_
+* `nghttp3 <https://github.com/ngtcp2/nghttp3>`_
+
 Compiling libnghttp2 C source code requires a C99 compiler.  gcc 4.8
 is known to be adequate.  In order to compile the C++ source code, gcc
 >= 6.0 or clang >= 6.0 is required.  C++ source code requires C++14
@@ -875,6 +883,14 @@ threads to avoid saturating a single core on client side.
    considered a DOS attack.  Please only use it against your private
    servers.
 
+If the experimental HTTP/3 is enabled, h2load can send requests to
+HTTP/3 server.  To do this, specify ``h3`` to ``--npn-list`` option
+like so:
+
+.. code-block:: text
+
+    $ h2load --npn-list h3 https://127.0.0.1:4433
+
 HPACK tools
 -----------
 

cmake/FindLibnghttp3.cmake

@@ -0,0 +1,41 @@
+# - Try to find libnghttp3
+# Once done this will define
+#  LIBNGHTTP3_FOUND        - System has libnghttp3
+#  LIBNGHTTP3_INCLUDE_DIRS - The libnghttp3 include directories
+#  LIBNGHTTP3_LIBRARIES    - The libraries needed to use libnghttp3
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBNGHTTP3 QUIET libnghttp3)
+
+find_path(LIBNGHTTP3_INCLUDE_DIR
+  NAMES nghttp3/nghttp3.h
+  HINTS ${PC_LIBNGHTTP3_INCLUDE_DIRS}
+)
+find_library(LIBNGHTTP3_LIBRARY
+  NAMES nghttp3
+  HINTS ${PC_LIBNGHTTP3_LIBRARY_DIRS}
+)
+
+if(LIBNGHTTP3_INCLUDE_DIR)
+  set(_version_regex "^#define[ \t]+NGHTTP3_VERSION[ \t]+\"([^\"]+)\".*")
+  file(STRINGS "${LIBNGHTTP3_INCLUDE_DIR}/nghttp3/version.h"
+    LIBNGHTTP3_VERSION REGEX "${_version_regex}")
+  string(REGEX REPLACE "${_version_regex}" "\\1"
+    LIBNGHTTP3_VERSION "${LIBNGHTTP3_VERSION}")
+  unset(_version_regex)
+endif()
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set LIBNGHTTP3_FOUND
+# to TRUE if all listed variables are TRUE and the requested version
+# matches.
+find_package_handle_standard_args(Libnghttp3 REQUIRED_VARS
+                                  LIBNGHTTP3_LIBRARY LIBNGHTTP3_INCLUDE_DIR
+                                  VERSION_VAR LIBNGHTTP3_VERSION)
+
+if(LIBNGHTTP3_FOUND)
+  set(LIBNGHTTP3_LIBRARIES     ${LIBNGHTTP3_LIBRARY})
+  set(LIBNGHTTP3_INCLUDE_DIRS  ${LIBNGHTTP3_INCLUDE_DIR})
+endif()
+
+mark_as_advanced(LIBNGHTTP3_INCLUDE_DIR LIBNGHTTP3_LIBRARY)

cmake/FindLibngtcp2.cmake

@@ -0,0 +1,41 @@
+# - Try to find libngtcp2
+# Once done this will define
+#  LIBNGTCP2_FOUND        - System has libngtcp2
+#  LIBNGTCP2_INCLUDE_DIRS - The libngtcp2 include directories
+#  LIBNGTCP2_LIBRARIES    - The libraries needed to use libngtcp2
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBNGTCP2 QUIET libngtcp2)
+
+find_path(LIBNGTCP2_INCLUDE_DIR
+  NAMES ngtcp2/ngtcp2.h
+  HINTS ${PC_LIBNGTCP2_INCLUDE_DIRS}
+)
+find_library(LIBNGTCP2_LIBRARY
+  NAMES ngtcp2
+  HINTS ${PC_LIBNGTCP2_LIBRARY_DIRS}
+)
+
+if(LIBNGTCP2_INCLUDE_DIR)
+  set(_version_regex "^#define[ \t]+NGTCP2_VERSION[ \t]+\"([^\"]+)\".*")
+  file(STRINGS "${LIBNGTCP2_INCLUDE_DIR}/ngtcp2/version.h"
+    LIBNGTCP2_VERSION REGEX "${_version_regex}")
+  string(REGEX REPLACE "${_version_regex}" "\\1"
+    LIBNGTCP2_VERSION "${LIBNGTCP2_VERSION}")
+  unset(_version_regex)
+endif()
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set LIBNGTCP2_FOUND
+# to TRUE if all listed variables are TRUE and the requested version
+# matches.
+find_package_handle_standard_args(Libngtcp2 REQUIRED_VARS
+                                  LIBNGTCP2_LIBRARY LIBNGTCP2_INCLUDE_DIR
+                                  VERSION_VAR LIBNGTCP2_VERSION)
+
+if(LIBNGTCP2_FOUND)
+  set(LIBNGTCP2_LIBRARIES     ${LIBNGTCP2_LIBRARY})
+  set(LIBNGTCP2_INCLUDE_DIRS  ${LIBNGTCP2_INCLUDE_DIR})
+endif()
+
+mark_as_advanced(LIBNGTCP2_INCLUDE_DIR LIBNGTCP2_LIBRARY)

cmake/FindLibngtcp2_crypto_openssl.cmake

@@ -0,0 +1,43 @@
+# - Try to find libngtcp2_crypto_openssl
+# Once done this will define
+#  LIBNGTCP2_CRYPTO_OPENSSL_FOUND        - System has libngtcp2_crypto_openssl
+#  LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIRS - The libngtcp2_crypto_openssl include directories
+#  LIBNGTCP2_CRYPTO_OPENSSL_LIBRARIES    - The libraries needed to use libngtcp2_crypto_openssl
+
+find_package(PkgConfig QUIET)
+pkg_check_modules(PC_LIBNGTCP2_CRYPTO_OPENSSL QUIET libngtcp2_crypto_openssl)
+
+find_path(LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIR
+  NAMES ngtcp2/ngtcp2_crypto_openssl.h
+  HINTS ${PC_LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIRS}
+)
+find_library(LIBNGTCP2_CRYPTO_OPENSSL_LIBRARY
+  NAMES ngtcp2_crypto_openssl
+  HINTS ${PC_LIBNGTCP2_CRYPTO_OPENSSL_LIBRARY_DIRS}
+)
+
+if(LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIR)
+  set(_version_regex "^#define[ \t]+NGTCP2_VERSION[ \t]+\"([^\"]+)\".*")
+  file(STRINGS "${LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIR}/ngtcp2/version.h"
+    LIBNGTCP2_CRYPTO_OPENSSL_VERSION REGEX "${_version_regex}")
+  string(REGEX REPLACE "${_version_regex}" "\\1"
+    LIBNGTCP2_CRYPTO_OPENSSL_VERSION "${LIBNGTCP2_CRYPTO_OPENSSL_VERSION}")
+  unset(_version_regex)
+endif()
+
+include(FindPackageHandleStandardArgs)
+# handle the QUIETLY and REQUIRED arguments and set
+# LIBNGTCP2_CRYPTO_OPENSSL_FOUND to TRUE if all listed variables are
+# TRUE and the requested version matches.
+find_package_handle_standard_args(Libngtcp2_crypto_openssl REQUIRED_VARS
+                                  LIBNGTCP2_CRYPTO_OPENSSL_LIBRARY
+                                  LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIR
+                                  VERSION_VAR LIBNGTCP2_CRYPTO_OPENSSL_VERSION)
+
+if(LIBNGTCP2_CRYPTO_OPENSSL_FOUND)
+  set(LIBNGTCP2_CRYPTO_OPENSSL_LIBRARIES ${LIBNGTCP2_CRYPTO_OPENSSL_LIBRARY})
+  set(LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIRS ${LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIR})
+endif()
+
+mark_as_advanced(LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIR
+                 LIBNGTCP2_CRYPTO_OPENSSL_LIBRARY)

cmakeconfig.h.in

@@ -78,3 +78,6 @@
 
 /* Define to 1 if you have the <unistd.h> header file. */
 #cmakedefine HAVE_UNISTD_H 1
+
+/* Define to 1 if HTTP/3 is enabled. */
+#cmakedefine ENABLE_HTTP3 1

configure.ac

@@ -107,6 +107,11 @@ AC_ARG_ENABLE([lib-only],
                     [Build libnghttp2 only.  This is a short hand for --disable-app --disable-examples --disable-hpack-tools --disable-python-bindings])],
     [request_lib_only=$enableval], [request_lib_only=no])
 
+AC_ARG_ENABLE([http3],
+    [AS_HELP_STRING([--enable-http3],
+                    [(EXPERIMENTAL) Enable HTTP/3.  This requires ngtcp2, nghttp3, and a custom OpenSSL.])],
+    [request_http3=$enableval], [request_http3=no])
+
 AC_ARG_WITH([libxml2],
     [AS_HELP_STRING([--with-libxml2],
                     [Use libxml2 [default=check]])],
@@ -172,6 +177,16 @@ AC_ARG_WITH([cython],
                     [Use cython in given PATH])],
     [cython_path=$withval], [])
 
+AC_ARG_WITH([libngtcp2],
+    [AS_HELP_STRING([--with-libngtcp2],
+                    [Use libngtcp2 [default=check]])],
+    [request_libngtcp2=$withval], [request_libngtcp2=check])
+
+AC_ARG_WITH([libnghttp3],
+    [AS_HELP_STRING([--with-libnghttp3],
+                    [Use libnghttp3 [default=check]])],
+    [request_libnghttp3=$withval], [request_libnghttp3=check])
+
 dnl Define variables
 AC_ARG_VAR([CYTHON], [the Cython executable])
 
@@ -334,6 +349,13 @@ case "$host_os" in
     ;;
 esac
 
+case "${build}" in
+  *-apple-darwin*)
+    EXTRA_DEFS="-D__APPLE_USE_RFC_3542"
+    AC_SUBST([EXTRA_DEFS])
+    ;;
+esac
+
 # zlib
 have_zlib=no
 if test "x${request_zlib}" != "xno"; then
@@ -431,6 +453,25 @@ if test "x${request_openssl}" != "xno"; then
                     [have_openssl=yes], [have_openssl=no])
   if test "x${have_openssl}" = "xno"; then
     AC_MSG_NOTICE($OPENSSL_PKG_ERRORS)
+  else
+    save_CFLAGS="$CFLAGS"
+    save_LIBS="$LIBS"
+    CFLAGS="$OPENSSL_CFLAGS $CFLAGS"
+    LIBS="$OPENSSL_LIBS $LIBS"
+
+    have_ssl_is_quic=no
+    AC_MSG_CHECKING([for SSL_is_quic])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+      #include <openssl/ssl.h>
+    ]], [[
+      SSL *ssl = NULL;
+      SSL_is_quic(ssl);
+    ]])],
+    [AC_MSG_RESULT([yes]); have_ssl_is_quic=yes],
+    [AC_MSG_RESULT([no]); have_ssl_is_quic=no])
+
+    CFLAGS="$save_CFLAGS"
+    LIBS="$save_LIBS"
   fi
 fi
 
@@ -454,6 +495,53 @@ if test "x${request_libcares}" = "xyes" &&
   AC_MSG_ERROR([libcares was requested (--with-libcares) but not found])
 fi
 
+# ngtcp2 (for src)
+have_libngtcp2=no
+if test "x${request_libngtcp2}" != "xno"; then
+  PKG_CHECK_MODULES([LIBNGTCP2], [libngtcp2 >= 0.0.0], [have_libngtcp2=yes],
+                    [have_libngtcp2=no])
+  if test "x${have_libngtcp2}" = "xno"; then
+    AC_MSG_NOTICE($LIBNGTCP2_PKG_ERRORS)
+  fi
+fi
+
+if test "x${request_libngtcp2}" = "xyes" &&
+   test "x${have_libngtcp2}" != "xyes"; then
+  AC_MSG_ERROR([libngtcp2 was requested (--with-libngtcp2) but not found])
+fi
+
+# ngtcp2_crypto_openssl (for src)
+have_libngtcp2_crypto_openssl=no
+if test "x${request_libngtcp2}" != "xno"; then
+  PKG_CHECK_MODULES([LIBNGTCP2_CRYPTO_OPENSSL],
+                    [libngtcp2_crypto_openssl >= 0.0.0],
+                    [have_libngtcp2_crypto_openssl=yes],
+                    [have_libngtcp2_crypto_openssl=no])
+  if test "x${have_libngtcp2_crypto_openssl}" = "xno"; then
+    AC_MSG_NOTICE($LIBNGTCP2_CRYPTO_OPENSSL_PKG_ERRORS)
+  fi
+fi
+
+if test "x${request_libngtcp2}" = "xyes" &&
+   test "x${have_libngtcp2_crypto_openssl}" != "xyes"; then
+  AC_MSG_ERROR([libngtcp2_crypto_openssl was requested (--with-libngtcp2) but not found])
+fi
+
+# nghttp3 (for src)
+have_libnghttp3=no
+if test "x${request_libnghttp3}" != "xno"; then
+  PKG_CHECK_MODULES([LIBNGHTTP3], [libnghttp3 >= 0.0.0], [have_libnghttp3=yes],
+                    [have_libnghttp3=no])
+  if test "x${have_libnghttp3}" = "xno"; then
+    AC_MSG_NOTICE($LIBNGHTTP3_PKG_ERRORS)
+  fi
+fi
+
+if test "x${request_libnghttp3}" = "xyes" &&
+   test "x${have_libnghttp3}" != "xyes"; then
+  AC_MSG_ERROR([libnghttp3 was requested (--with-libnghttp3) but not found])
+fi
+
 # libevent_openssl (for examples)
 # 2.0.8 is required because we use evconnlistener_set_error_cb()
 have_libevent_openssl=no
@@ -598,6 +686,24 @@ fi
 
 AM_CONDITIONAL([ENABLE_APP], [ test "x${enable_app}" = "xyes" ])
 
+# Check HTTP/3 support
+enable_http3=no
+if test "x${request_http3}" != "xno" &&
+   test "x${have_ssl_is_quic}" = "xyes" &&
+   test "x${have_libngtcp2}" = "xyes" &&
+   test "x${have_libngtcp2_crypto_openssl}" = "xyes" &&
+   test "x${have_libnghttp3}" = "xyes"; then
+  enable_http3=yes
+  AC_DEFINE([ENABLE_HTTP3], [1], [Define to 1 if HTTP/3 is enabled.])
+fi
+
+if test "x${request_http3}" = "xyes" &&
+   test "x${enable_http3}" != "xyes"; then
+  AC_MSG_ERROR([HTTP/3 was requested (--enable-http3) but dependencies are not met.])
+fi
+
+AM_CONDITIONAL([ENABLE_HTTP3], [ test "x${enable_http3}" = "xyes" ])
+
 enable_hpack_tools=no
 # HPACK tools requires jansson
 if test "x${request_hpack_tools}" != "xno" &&
@@ -824,6 +930,31 @@ AC_CHECK_DECLS([initgroups], [], [], [[
   #include <grp.h>
 ]])
 
+have_netinet_udp_h_udp_segment=no
+AC_CHECK_DECL([UDP_SEGMENT], [have_netinet_udp_h_udp_segment=yes],
+              [have_netinet_udp_h_udp_segment=no], [[
+  #include <netinet/udp.h>
+]])
+
+if test "x$have_netinet_udp_h_udp_segment" = "xno"; then
+  have_linux_udp_h_udp_segment=no
+  AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
+                     [[
+                       #include <linux/udp.h>
+                     ]],
+                     [[
+		       #if UDP_SEGMENT != 103
+		       exit(1)
+		       #endif
+                     ]])],
+		    [have_linux_udp_h_udp_segment=yes],
+		    [have_linux_udp_h_udp_segment=no])
+
+  if test "x$have_linux_udp_h_udp_segment" = "xyes"; then
+    EXTRA_DEFS="$EXTRA_DEFS -DUDP_SEGMENT=103"
+  fi
+fi
+
 save_CFLAGS=$CFLAGS
 save_CXXFLAGS=$CXXFLAGS
 
@@ -991,6 +1122,8 @@ AC_MSG_NOTICE([summary of build options:
       CXX1XCXXFLAGS:  ${CXX1XCXXFLAGS}
       EXTRACFLAG:     ${EXTRACFLAG}
       LIBS:           ${LIBS}
+      DEFS:           ${DEFS}
+      EXTRA_DEFS:     ${EXTRA_DEFS}
     Library:
       Shared:         ${enable_shared}
       Static:         ${enable_static}
@@ -1011,6 +1144,9 @@ AC_MSG_NOTICE([summary of build options:
       Libxml2:        ${have_libxml2} (CFLAGS='${LIBXML2_CFLAGS}' LIBS='${LIBXML2_LIBS}')
       Libev:          ${have_libev} (CFLAGS='${LIBEV_CFLAGS}' LIBS='${LIBEV_LIBS}')
       Libc-ares:      ${have_libcares} (CFLAGS='${LIBCARES_CFLAGS}' LIBS='${LIBCARES_LIBS}')
+      libngtcp2:      ${have_libngtcp2} (CFLAGS='${LIBNGTCP2_CFLAGS}' LIBS='${LIBNGTCP2_LIBS}')
+      libngtcp2_crypto_openssl: ${have_libngtcp2_crypto_openssl} (CFLAGS='${LIBNGTCP2_CRYPTO_OPENSSL_CFLAGS}' LIBS='${LIBNGTCP2_CRYPTO_OPENSSL_LIBS}')
+      libnghttp3:     ${have_libnghttp3} (CFLAGS='${LIBNGHTTP3_CFLAGS}' LIBS='${LIBNGHTTP3_LIBS}')
       Libevent(SSL):  ${have_libevent_openssl} (CFLAGS='${LIBEVENT_OPENSSL_CFLAGS}' LIBS='${LIBEVENT_OPENSSL_LIBS}')
       Jansson:        ${have_jansson} (CFLAGS='${JANSSON_CFLAGS}' LIBS='${JANSSON_LIBS}')
       Jemalloc:       ${have_jemalloc} (CFLAGS='${JEMALLOC_CFLAGS}' LIBS='${JEMALLOC_LIBS}')
@@ -1032,4 +1168,5 @@ AC_MSG_NOTICE([summary of build options:
       Examples:       ${enable_examples}
       Python bindings:${enable_python_bindings}
       Threading:      ${enable_threads}
+      HTTP/3 (EXPERIMENTAL): ${enable_http3}
 ])

docker/Dockerfile-h2load-http3

@@ -0,0 +1,39 @@
+FROM debian:10 as build
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        git g++ make binutils autoconf automake autotools-dev libtool \
+        pkg-config \
+        zlib1g-dev libev-dev libjemalloc-dev ruby-dev libc-ares-dev bison && \
+    git clone --depth 1 -b OpenSSL_1_1_1k+quic https://github.com/quictls/openssl && \
+    cd openssl && ./config enable-tls1_3 --openssldir=/etc/ssl && make -j$(nproc) && make install_sw && cd .. && rm -rf openssl && \
+    git clone --depth 1 https://github.com/ngtcp2/nghttp3 && \
+    cd nghttp3 && autoreconf -i && \
+    ./configure --enable-lib-only && \
+    make -j$(nproc) && make install-strip && cd .. && rm -rf nghttp3 && \
+    git clone --depth 1 https://github.com/ngtcp2/ngtcp2 && \
+    cd ngtcp2 && autoreconf -i && \
+    ./configure --enable-lib-only \
+        LIBTOOL_LDFLAGS="-static-libtool-libs" \
+        OPENSSL_LIBS="-l:libssl.a -l:libcrypto.a -ldl -lpthread" && \
+    make -j$(nproc) && make install-strip && cd .. && rm -rf ngtcp2 && \
+    git clone --depth 1 https://github.com/nghttp2/nghttp2.git && \
+    cd nghttp2 && \
+    git submodule update --init && autoreconf -i && \
+    ./configure --disable-examples --disable-hpack-tools \
+        --disable-python-bindings --with-mruby --with-neverbleed \
+        --enable-http3 \
+        LIBTOOL_LDFLAGS="-static-libtool-libs" \
+        LIBS="-ldl -pthread" \
+        OPENSSL_LIBS="-l:libssl.a -l:libcrypto.a" \
+        LIBEV_LIBS="-l:libev.a" \
+        JEMALLOC_LIBS="-l:libjemalloc.a" \
+        LIBCARES_LIBS="-l:libcares.a" \
+        ZLIB_LIBS="-l:libz.a" && \
+    make -j$(nproc) install-strip
+
+FROM gcr.io/distroless/cc-debian10
+
+COPY --from=build /usr/local/bin/h2load /usr/local/bin/
+
+ENTRYPOINT ["/usr/local/bin/h2load"]

src/CMakeLists.txt

@@ -15,6 +15,9 @@ include_directories(
   ${JEMALLOC_INCLUDE_DIRS}
   ${LIBXML2_INCLUDE_DIRS}
   ${LIBEV_INCLUDE_DIRS}
+  ${LIBNGHTTP3_INCLUDE_DIRS}
+  ${LIBNGTCP2_INCLUDE_DIRS}
+  ${LIBNGTCP2_CRYPTO_OPENSSL_INCLUDE_DIRS}
   ${OPENSSL_INCLUDE_DIRS}
   ${LIBCARES_INCLUDE_DIRS}
   ${JANSSON_INCLUDE_DIRS}
@@ -27,6 +30,9 @@ link_libraries(
   ${JEMALLOC_LIBRARIES}
   ${LIBXML2_LIBRARIES}
   ${LIBEV_LIBRARIES}
+  ${LIBNGHTTP3_LIBRARIES}
+  ${LIBNGTCP2_LIBRARIES}
+  ${LIBNGTCP2_CRYPTO_OPENSSL_LIBRARIES}
   ${OPENSSL_LIBRARIES}
   ${LIBCARES_LIBRARIES}
   ${JANSSON_LIBRARIES}
@@ -67,7 +73,13 @@ if(ENABLE_APP)
     h2load_http2_session.cc
     h2load_http1_session.cc
   )
-
+  if(ENABLE_HTTP3)
+    list(APPEND H2LOAD_SOURCES
+      h2load_http3_session.cc
+      h2load_quic.cc
+      quic.cc
+    )
+  endif()
 
   # Common libnhttpx sources (used for nghttpx and unit tests)
   set(NGHTTPX_SRCS
@@ -120,6 +132,16 @@ if(ENABLE_APP)
       shrpx_mruby_module_response.cc
     )
   endif()
+  if(ENABLE_HTTP3)
+    list(APPEND NGHTTPX_SRCS
+     shrpx_quic.cc
+     shrpx_quic_listener.cc
+     shrpx_quic_connection_handler.cc
+     shrpx_http3_upstream.cc
+     http3.cc
+     quic.cc
+    )
+  endif()
   add_library(nghttpx_static STATIC ${NGHTTPX_SRCS})
   set_target_properties(nghttpx_static PROPERTIES ARCHIVE_OUTPUT_NAME nghttpx)
 

src/Makefile.am

@@ -44,10 +44,14 @@ AM_CPPFLAGS = \
 	@JEMALLOC_CFLAGS@ \
 	@LIBXML2_CFLAGS@ \
 	@LIBEV_CFLAGS@ \
+	@LIBNGHTTP3_CFLAGS@ \
+	@LIBNGTCP2_CRYPTO_OPENSSL_CFLAGS@ \
+	@LIBNGTCP2_CFLAGS@ \
 	@OPENSSL_CFLAGS@ \
 	@LIBCARES_CFLAGS@ \
 	@JANSSON_CFLAGS@ \
 	@ZLIB_CFLAGS@ \
+	@EXTRA_DEFS@ \
 	@DEFS@
 AM_LDFLAGS = @LIBTOOL_LDFLAGS@
 
@@ -57,6 +61,9 @@ LDADD = $(top_builddir)/lib/libnghttp2.la \
 	@JEMALLOC_LIBS@ \
 	@LIBXML2_LIBS@ \
 	@LIBEV_LIBS@ \
+	@LIBNGHTTP3_LIBS@ \
+	@LIBNGTCP2_CRYPTO_OPENSSL_LIBS@ \
+	@LIBNGTCP2_LIBS@ \
 	@OPENSSL_LIBS@ \
 	@LIBCARES_LIBS@ \
 	@SYSTEMD_LIBS@ \
@@ -99,6 +106,13 @@ h2load_SOURCES = util.cc util.h \
 	h2load_http2_session.cc h2load_http2_session.h \
 	h2load_http1_session.cc h2load_http1_session.h
 
+if ENABLE_HTTP3
+h2load_SOURCES += \
+	h2load_http3_session.cc h2load_http3_session.h \
+	h2load_quic.cc h2load_quic.h \
+	quic.cc quic.h
+endif # ENABLE_HTTP3
+
 NGHTTPX_SRCS = \
 	util.cc util.h http2.cc http2.h timegm.c timegm.h base64.h \
 	app_helper.cc app_helper.h \
@@ -156,6 +170,16 @@ NGHTTPX_SRCS += \
 	shrpx_mruby_module_response.cc shrpx_mruby_module_response.h
 endif # HAVE_MRUBY
 
+if ENABLE_HTTP3
+NGHTTPX_SRCS += \
+	shrpx_quic.cc shrpx_quic.h \
+	shrpx_quic_listener.cc shrpx_quic_listener.h \
+	shrpx_quic_connection_handler.cc shrpx_quic_connection_handler.h \
+	shrpx_http3_upstream.cc shrpx_http3_upstream.h \
+	http3.cc http3.h \
+	quic.cc quic.h
+endif # ENABLE_HTTP3
+
 noinst_LIBRARIES = libnghttpx.a
 libnghttpx_a_SOURCES = ${NGHTTPX_SRCS}
 libnghttpx_a_CPPFLAGS = ${AM_CPPFLAGS}

src/h2load.cc

@@ -34,6 +34,8 @@
 #ifdef HAVE_FCNTL_H
 #  include <fcntl.h>
 #endif // HAVE_FCNTL_H
+#include <sys/mman.h>
+#include <netinet/udp.h>
 
 #include <cstdio>
 #include <cassert>
@@ -48,10 +50,18 @@
 
 #include <openssl/err.h>
 
+#ifdef ENABLE_HTTP3
+#  include <ngtcp2/ngtcp2.h>
+#endif // ENABLE_HTTP3
+
 #include "url-parser/url_parser.h"
 
 #include "h2load_http1_session.h"
 #include "h2load_http2_session.h"
+#ifdef ENABLE_HTTP3
+#  include "h2load_http3_session.h"
+#  include "h2load_quic.h"
+#endif // ENABLE_HTTP3
 #include "tls.h"
 #include "http2.h"
 #include "util.h"
@@ -71,9 +81,22 @@ bool recorded(const std::chrono::steady_clock::time_point &t) {
 }
 } // namespace
 
+namespace {
+std::ofstream keylog_file;
+void keylog_callback(const SSL *ssl, const char *line) {
+  keylog_file.write(line, strlen(line));
+  keylog_file.put('\n');
+  keylog_file.flush();
+}
+} // namespace
+
 Config::Config()
     : ciphers(tls::DEFAULT_CIPHER_LIST),
+      tls13_ciphers("TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_"
+                    "CHACHA20_POLY1305_SHA256:TLS_AES_128_CCM_SHA256"),
+      groups("X25519:P-256:P-384:P-521"),
       data_length(-1),
+      data(nullptr),
       addrs(nullptr),
       nreqs(1),
       nclients(1),
@@ -92,6 +115,7 @@ Config::Config()
       encoder_header_table_size(4_k),
       data_fd(-1),
       log_fd(-1),
+      qlog_file_base(),
       port(0),
       default_port(0),
       connect_to_port(0),
@@ -99,7 +123,8 @@ Config::Config()
       timing_script(false),
       base_uri_unix(false),
       unix_addr{},
-      rps(0.) {}
+      rps(0.),
+      no_udp_gso(false) {}
 
 Config::~Config() {
   if (addrs) {
@@ -119,6 +144,14 @@ bool Config::is_rate_mode() const { return (this->rate != 0); }
 bool Config::is_timing_based_mode() const { return (this->duration > 0); }
 bool Config::has_base_uri() const { return (!this->base_uri.empty()); }
 bool Config::rps_enabled() const { return this->rps > 0.0; }
+bool Config::is_quic() const {
+#ifdef ENABLE_HTTP3
+  return !npn_list.empty() &&
+         (npn_list[0] == NGHTTP3_ALPN_H3 || npn_list[0] == "\x5h3-29");
+#else  // !ENABLE_HTTP3
+  return false;
+#endif // !ENABLE_HTTP3
+}
 Config config;
 
 namespace {
@@ -138,7 +171,9 @@ Stats::Stats(size_t req_todo, size_t nclients)
       bytes_head(0),
       bytes_head_decomp(0),
       bytes_body(0),
-      status() {}
+      status(),
+      udp_dgram_recv(0),
+      udp_dgram_sent(0) {}
 
 Stream::Stream() : req_stat{}, status_success(-1) {}
 
@@ -195,8 +230,7 @@ void readcb(struct ev_loop *loop, ev_io *w, int revents) {
     delete client;
     return;
   }
-  writecb(loop, &client->wev, revents);
+  client->signal_write();
-  // client->disconnect() and client->fail() may be called
 }
 } // namespace
 
@@ -409,6 +443,9 @@ Client::Client(uint32_t id, Worker *worker, size_t req_todo)
       cstat{},
       worker(worker),
       ssl(nullptr),
+#ifdef ENABLE_HTTP3
+      quic{},
+#endif // ENABLE_HTTP3
       next_addr(config.addrs),
       current_addr(nullptr),
       reqidx(0),
@@ -420,6 +457,7 @@ Client::Client(uint32_t id, Worker *worker, size_t req_todo)
       req_done(0),
       id(id),
       fd(-1),
+      local_addr{},
       new_connection_requested(false),
       final(false),
       rps_duration_started(0),
@@ -449,11 +487,22 @@ Client::Client(uint32_t id, Worker *worker, size_t req_todo)
 
   ev_timer_init(&rps_watcher, rps_cb, 0., 0.);
   rps_watcher.data = this;
+
+#ifdef ENABLE_HTTP3
+  ev_timer_init(&quic.pkt_timer, quic_pkt_timeout_cb, 0., 0.);
+  quic.pkt_timer.data = this;
+#endif // ENABLE_HTTP3
 }
 
 Client::~Client() {
   disconnect();
 
+#ifdef ENABLE_HTTP3
+  if (config.is_quic()) {
+    quic_free();
+  }
+#endif // ENABLE_HTTP3
+
   if (ssl) {
     SSL_free(ssl);
   }
@@ -466,6 +515,36 @@ int Client::do_read() { return readfn(*this); }
 int Client::do_write() { return writefn(*this); }
 
 int Client::make_socket(addrinfo *addr) {
+  int rv;
+
+  if (config.is_quic()) {
+#ifdef ENABLE_HTTP3
+    fd = util::create_nonblock_udp_socket(addr->ai_family);
+    if (fd == -1) {
+      return -1;
+    }
+
+    rv = util::bind_any_addr_udp(fd, addr->ai_family);
+    if (rv != 0) {
+      close(fd);
+      fd = -1;
+      return -1;
+    }
+
+    socklen_t addrlen = sizeof(local_addr.su.storage);
+    rv = getsockname(fd, &local_addr.su.sa, &addrlen);
+    if (rv == -1) {
+      return -1;
+    }
+    local_addr.len = addrlen;
+
+    if (quic_init(&local_addr.su.sa, local_addr.len, addr->ai_addr,
+                  addr->ai_addrlen) != 0) {
+      std::cerr << "quic_init failed" << std::endl;
+      return -1;
+    }
+#endif // ENABLE_HTTP3
+  } else {
     fd = util::create_nonblock_socket(addr->ai_family);
     if (fd == -1) {
       return -1;
@@ -475,17 +554,20 @@ int Client::make_socket(addrinfo *addr) {
         ssl = SSL_new(worker->ssl_ctx);
       }
 
-    auto config = worker->config;
-
-    if (!util::numeric_host(config->host.c_str())) {
-      SSL_set_tlsext_host_name(ssl, config->host.c_str());
-    }
-
       SSL_set_fd(ssl, fd);
       SSL_set_connect_state(ssl);
     }
+  }
 
-  auto rv = ::connect(fd, addr->ai_addr, addr->ai_addrlen);
+  if (ssl && !util::numeric_host(config.host.c_str())) {
+    SSL_set_tlsext_host_name(ssl, config.host.c_str());
+  }
+
+  if (config.is_quic()) {
+    return 0;
+  }
+
+  rv = ::connect(fd, addr->ai_addr, addr->ai_addrlen);
   if (rv != 0 && errno != EINPROGRESS) {
     if (ssl) {
       SSL_free(ssl);
@@ -542,13 +624,22 @@ int Client::connect() {
     current_addr = addr;
   }
 
-  writefn = &Client::connected;
-
   ev_io_set(&rev, fd, EV_READ);
   ev_io_set(&wev, fd, EV_WRITE);
 
   ev_io_start(worker->loop, &wev);
 
+  if (config.is_quic()) {
+#ifdef ENABLE_HTTP3
+    ev_io_start(worker->loop, &rev);
+
+    readfn = &Client::read_quic;
+    writefn = &Client::write_quic;
+#endif // ENABLE_HTTP3
+  } else {
+    writefn = &Client::connected;
+  }
+
   return 0;
 }
 
@@ -603,6 +694,15 @@ void Client::fail() {
 void Client::disconnect() {
   record_client_end_time();
 
+#ifdef ENABLE_HTTP3
+  if (config.is_quic()) {
+    quic_close_connection();
+  }
+#endif // ENABLE_HTTP3
+
+#ifdef ENABLE_HTTP3
+  ev_timer_stop(worker->loop, &quic.pkt_timer);
+#endif // ENABLE_HTTP3
   ev_timer_stop(worker->loop, &conn_inactivity_watcher);
   ev_timer_stop(worker->loop, &conn_active_watcher);
   ev_timer_stop(worker->loop, &rps_watcher);
@@ -765,7 +865,14 @@ void Client::report_app_info() {
 }
 
 void Client::terminate_session() {
+#ifdef ENABLE_HTTP3
+  if (config.is_quic()) {
+    quic.close_requested = true;
+  }
+#endif // ENABLE_HTTP3
+  if (session) {
     session->terminate();
+  }
   // http1 session needs writecb to tear down session.
   signal_write();
 }
@@ -963,7 +1070,15 @@ int Client::connection_made() {
 
     if (next_proto) {
       auto proto = StringRef{next_proto, next_proto_len};
-      if (util::check_h2_is_selected(proto)) {
+      if (config.is_quic()) {
+#ifdef ENABLE_HTTP3
+        assert(session);
+        if (!util::streq(StringRef{&NGHTTP3_ALPN_H3[1]}, proto) &&
+            !util::streq_l("h3-29", proto)) {
+          return -1;
+        }
+#endif // ENABLE_HTTP3
+      } else if (util::check_h2_is_selected(proto)) {
         session = std::make_unique<Http2Session>(this);
       } else if (util::streq(NGHTTP2_H1_1, proto)) {
         session = std::make_unique<Http1Session>(this);
@@ -972,6 +1087,9 @@ int Client::connection_made() {
       // Just assign next_proto to selected_proto anyway to show the
       // negotiation result.
       selected_proto = proto.str();
+    } else if (config.is_quic()) {
+      std::cerr << "QUIC requires ALPN negotiation" << std::endl;
+      return -1;
     } else {
       std::cout << "No protocol negotiated. Fallback behaviour may be activated"
                 << std::endl;
@@ -1285,6 +1403,46 @@ int Client::write_tls() {
   return 0;
 }
 
+#ifdef ENABLE_HTTP3
+int Client::write_udp(const sockaddr *addr, socklen_t addrlen,
+                      const uint8_t *data, size_t datalen, size_t gso_size) {
+  iovec msg_iov;
+  msg_iov.iov_base = const_cast<uint8_t *>(data);
+  msg_iov.iov_len = datalen;
+
+  msghdr msg{};
+  msg.msg_name = const_cast<sockaddr *>(addr);
+  msg.msg_namelen = addrlen;
+  msg.msg_iov = &msg_iov;
+  msg.msg_iovlen = 1;
+
+#  ifdef UDP_SEGMENT
+  std::array<uint8_t, CMSG_SPACE(sizeof(uint16_t))> msg_ctrl{};
+  if (gso_size && datalen > gso_size) {
+    msg.msg_control = msg_ctrl.data();
+    msg.msg_controllen = msg_ctrl.size();
+
+    auto cm = CMSG_FIRSTHDR(&msg);
+    cm->cmsg_level = SOL_UDP;
+    cm->cmsg_type = UDP_SEGMENT;
+    cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));
+    *(reinterpret_cast<uint16_t *>(CMSG_DATA(cm))) = gso_size;
+  }
+#  endif // UDP_SEGMENT
+
+  auto nwrite = sendmsg(fd, &msg, 0);
+  if (nwrite < 0) {
+    std::cerr << "sendto: errno=" << errno << std::endl;
+  } else {
+    ++worker->stats.udp_dgram_sent;
+  }
+
+  ev_io_stop(worker->loop, &wev);
+
+  return 0;
+}
+#endif // ENABLE_HTTP3
+
 void Client::record_request_time(RequestStat *req_stat) {
   req_stat->request_time = std::chrono::steady_clock::now();
   req_stat->request_wall_time = std::chrono::system_clock::now();
@@ -1403,7 +1561,7 @@ Worker::~Worker() {
 
 void Worker::stop_all_clients() {
   for (auto client : clients) {
-    if (client && client->session) {
+    if (client) {
       client->terminate_session();
     }
   }
@@ -1938,6 +2096,7 @@ Options:
               Default: 1
   -w, --window-bits=<N>
               Sets the stream level initial window size to (2**<N>)-1.
+              For QUIC, <N> is capped to 26 (roughly 64MiB).
               Default: )"
       << config.window_bits << R"(
   -W, --connection-window-bits=<N>
@@ -1948,10 +2107,15 @@ Options:
   -H, --header=<HEADER>
               Add/Override a header to the requests.
   --ciphers=<SUITE>
-              Set allowed  cipher list.  The  format of the  string is
+              Set  allowed cipher  list  for TLSv1.2  or ealier.   The
-              described in OpenSSL ciphers(1).
+              format of the string is described in OpenSSL ciphers(1).
               Default: )"
       << config.ciphers << R"(
+  --tls13-ciphers=<SUITE>
+              Set allowed cipher list for  TLSv1.3.  The format of the
+              string is described in OpenSSL ciphers(1).
+              Default: )"
+      << config.tls13_ciphers << R"(
   -p, --no-tls-proto=<PROTOID>
               Specify ALPN identifier of the  protocol to be used when
               accessing http URI without SSL/TLS.
@@ -2065,11 +2229,24 @@ Options:
               response  time when  using  one worker  thread, but  may
               appear slightly  out of order with  multiple threads due
               to buffering.  Status code is -1 for failed streams.
+  --qlog-file-base=<PATH>
+              Enable qlog output and specify base file name for qlogs.
+              Qlog  is emitted  for each connection.
+              For  a  given  base  name "base", each  output file name
+              becomes  "base.M.N.qlog"  where M is worker ID  and N is
+              client ID (e.g. "base.0.3.qlog").
+              Only effective in QUIC runs.
   --connect-to=<HOST>[:<PORT>]
               Host and port to connect  instead of using the authority
               in <URI>.
   --rps=<N>   Specify request  per second for each  client.  --rps and
               --timing-script-file are mutually exclusive.
+  --groups=<GROUPS>
+              Specify the supported groups.
+              Default: )"
+      << config.groups << R"(
+  --no-udp-gso
+              Disable UDP GSO.
   -v, --verbose
               Output debug information.
   --version   Display version information and exit.
@@ -2097,6 +2274,7 @@ int main(int argc, char **argv) {
 
   std::string datafile;
   std::string logfile;
+  std::string qlog_base;
   bool nreqs_set_manually = false;
   while (1) {
     static int flag = 0;
@@ -2130,6 +2308,10 @@ int main(int argc, char **argv) {
         {"log-file", required_argument, &flag, 10},
         {"connect-to", required_argument, &flag, 11},
         {"rps", required_argument, &flag, 12},
+        {"groups", required_argument, &flag, 13},
+        {"tls13-ciphers", required_argument, &flag, 14},
+        {"no-udp-gso", no_argument, &flag, 15},
+        {"qlog-file-base", required_argument, &flag, 16},
         {nullptr, 0, nullptr, 0}};
     int option_index = 0;
     auto c = getopt_long(argc, argv,
@@ -2380,6 +2562,22 @@ int main(int argc, char **argv) {
         config.rps = v;
         break;
       }
+      case 13:
+        // --groups
+        config.groups = optarg;
+        break;
+      case 14:
+        // --tls13-ciphers
+        config.tls13_ciphers = optarg;
+        break;
+      case 15:
+        // --no-udp-gso
+        config.no_udp_gso = true;
+        break;
+      case 16:
+        // --qlog-file-base
+        qlog_base = optarg;
+        break;
       }
       break;
     default:
@@ -2546,6 +2744,13 @@ int main(int argc, char **argv) {
       exit(EXIT_FAILURE);
     }
     config.data_length = data_stat.st_size;
+    auto addr = mmap(nullptr, config.data_length, PROT_READ, MAP_SHARED,
+                     config.data_fd, 0);
+    if (addr == MAP_FAILED) {
+      std::cerr << "-d: Could not mmap file " << datafile << std::endl;
+      exit(EXIT_FAILURE);
+    }
+    config.data = static_cast<uint8_t *>(addr);
   }
 
   if (!logfile.empty()) {
@@ -2557,6 +2762,18 @@ int main(int argc, char **argv) {
     }
   }
 
+  if (!qlog_base.empty()) {
+    if (!config.is_quic()) {
+      std::cerr
+          << "Warning: --qlog-file-base: only effective in quic, ignoring."
+          << std::endl;
+    } else {
+#ifdef ENABLE_HTTP3
+      config.qlog_file_base = qlog_base;
+#endif // ENABLE_HTTP3
+    }
+  }
+
   struct sigaction act {};
   act.sa_handler = SIG_IGN;
   sigaction(SIGPIPE, &act, nullptr);
@@ -2576,7 +2793,12 @@ int main(int argc, char **argv) {
   SSL_CTX_set_mode(ssl_ctx, SSL_MODE_AUTO_RETRY);
   SSL_CTX_set_mode(ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
 
-  if (nghttp2::tls::ssl_ctx_set_proto_versions(
+  if (config.is_quic()) {
+#ifdef ENABLE_HTTP3
+    SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION);
+    SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION);
+#endif // ENABLE_HTTP3
+  } else if (nghttp2::tls::ssl_ctx_set_proto_versions(
                  ssl_ctx, nghttp2::tls::NGHTTP2_TLS_MIN_VERSION,
                  nghttp2::tls::NGHTTP2_TLS_MAX_VERSION) != 0) {
     std::cerr << "Could not set TLS versions" << std::endl;
@@ -2590,6 +2812,20 @@ int main(int argc, char **argv) {
     exit(EXIT_FAILURE);
   }
 
+#if OPENSSL_1_1_1_API
+  if (SSL_CTX_set_ciphersuites(ssl_ctx, config.tls13_ciphers.c_str()) == 0) {
+    std::cerr << "SSL_CTX_set_ciphersuites with " << config.tls13_ciphers
+              << " failed: " << ERR_error_string(ERR_get_error(), nullptr)
+              << std::endl;
+    exit(EXIT_FAILURE);
+  }
+#endif // OPENSSL_1_1_1_API
+
+  if (SSL_CTX_set1_groups_list(ssl_ctx, config.groups.c_str()) != 1) {
+    std::cerr << "SSL_CTX_set1_groups_list failed" << std::endl;
+    exit(EXIT_FAILURE);
+  }
+
 #ifndef OPENSSL_NO_NEXTPROTONEG
   SSL_CTX_set_next_proto_select_cb(ssl_ctx, client_select_next_proto_cb,
                                    nullptr);
@@ -2604,6 +2840,16 @@ int main(int argc, char **argv) {
   SSL_CTX_set_alpn_protos(ssl_ctx, proto_list.data(), proto_list.size());
 #endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
 
+#if OPENSSL_1_1_1_API
+  auto keylog_filename = getenv("SSLKEYLOGFILE");
+  if (keylog_filename) {
+    keylog_file.open(keylog_filename, std::ios_base::app);
+    if (keylog_file) {
+      SSL_CTX_set_keylog_callback(ssl_ctx, keylog_callback);
+    }
+  }
+#endif // OPENSSL_1_1_1_API
+
   std::string user_agent = "h2load nghttp2/" NGHTTP2_VERSION;
   Headers shared_nva;
   shared_nva.emplace_back(":scheme", config.scheme);
@@ -2822,6 +3068,8 @@ int main(int argc, char **argv) {
     stats.bytes_head += s.bytes_head;
     stats.bytes_head_decomp += s.bytes_head_decomp;
     stats.bytes_body += s.bytes_body;
+    stats.udp_dgram_recv += s.udp_dgram_recv;
+    stats.udp_dgram_sent += s.udp_dgram_sent;
 
     for (size_t i = 0; i < stats.status.size(); ++i) {
       stats.status[i] += s.status[i];
@@ -2880,14 +3128,21 @@ traffic: )" << util::utos_funit(stats.bytes_total)
             << util::utos_funit(stats.bytes_head) << "B (" << stats.bytes_head
             << ") headers (space savings " << header_space_savings * 100
             << "%), " << util::utos_funit(stats.bytes_body) << "B ("
-            << stats.bytes_body << R"() data
+            << stats.bytes_body << R"() data)" << std::endl;
-                     min         max         mean         sd        +/- sd
+#ifdef ENABLE_HTTP3
+  if (config.is_quic()) {
+    std::cout << "UDP datagram: " << stats.udp_dgram_sent << " sent, "
+              << stats.udp_dgram_recv << " received" << std::endl;
+  }
+#endif // ENABLE_HTTP3
+  std::cout
+      << R"(                     min         max         mean         sd        +/- sd
 time for request: )"
       << std::setw(10) << util::format_duration(ts.request.min) << "  "
       << std::setw(10) << util::format_duration(ts.request.max) << "  "
       << std::setw(10) << util::format_duration(ts.request.mean) << "  "
-            << std::setw(10) << util::format_duration(ts.request.sd)
+      << std::setw(10) << util::format_duration(ts.request.sd) << std::setw(9)
-            << std::setw(9) << util::dtos(ts.request.within_sd) << "%"
+      << util::dtos(ts.request.within_sd) << "%"
       << "\ntime for connect: " << std::setw(10)
       << util::format_duration(ts.connect.min) << "  " << std::setw(10)
       << util::format_duration(ts.connect.max) << "  " << std::setw(10)
@@ -2901,8 +3156,8 @@ time for request: )"
       << util::format_duration(ts.ttfb.sd) << std::setw(9)
       << util::dtos(ts.ttfb.within_sd) << "%"
       << "\nreq/s           : " << std::setw(10) << ts.rps.min << "  "
-            << std::setw(10) << ts.rps.max << "  " << std::setw(10)
+      << std::setw(10) << ts.rps.max << "  " << std::setw(10) << ts.rps.mean
-            << ts.rps.mean << "  " << std::setw(10) << ts.rps.sd << std::setw(9)
+      << "  " << std::setw(10) << ts.rps.sd << std::setw(9)
       << util::dtos(ts.rps.within_sd) << "%" << std::endl;
 
   SSL_CTX_free(ssl_ctx);

src/h2load.h

@@ -45,11 +45,19 @@
 
 #include <nghttp2/nghttp2.h>
 
+#ifdef ENABLE_HTTP3
+#  include <ngtcp2/ngtcp2.h>
+#  include <ngtcp2/ngtcp2_crypto.h>
+#endif // ENABLE_HTTP3
+
 #include <ev.h>
 
 #include <openssl/ssl.h>
 
 #include "http2.h"
+#ifdef ENABLE_HTTP3
+#  include "quic.h"
+#endif // ENABLE_HTTP3
 #include "memchunk.h"
 #include "template.h"
 
@@ -72,8 +80,13 @@ struct Config {
   std::string connect_to_host;
   std::string ifile;
   std::string ciphers;
+  std::string tls13_ciphers;
+  // supported groups (or curves).
+  std::string groups;
   // length of upload data
   int64_t data_length;
+  // memory mapped upload data
+  uint8_t *data;
   addrinfo *addrs;
   size_t nreqs;
   size_t nclients;
@@ -100,6 +113,8 @@ struct Config {
   int data_fd;
   // file descriptor to write per-request stats to.
   int log_fd;
+  // base file name of qlog output files
+  std::string qlog_file_base;
   uint16_t port;
   uint16_t default_port;
   uint16_t connect_to_port;
@@ -116,6 +131,8 @@ struct Config {
   std::vector<std::string> npn_list;
   // The number of request per second for each client.
   double rps;
+  // Disables GSO for UDP connections.
+  bool no_udp_gso;
 
   Config();
   ~Config();
@@ -124,6 +141,7 @@ struct Config {
   bool is_timing_based_mode() const;
   bool has_base_uri() const;
   bool rps_enabled() const;
+  bool is_quic() const;
 };
 
 struct RequestStat {
@@ -220,6 +238,10 @@ struct Stats {
   std::vector<RequestStat> req_stats;
   // The statistics per client
   std::vector<ClientStat> client_stats;
+  // The number of UDP datagrams received.
+  size_t udp_dgram_recv;
+  // The number of UDP datagrams sent.
+  size_t udp_dgram_sent;
 };
 
 enum ClientState { CLIENT_IDLE, CLIENT_CONNECTED };
@@ -309,6 +331,16 @@ struct Client {
   std::function<int(Client &)> readfn, writefn;
   Worker *worker;
   SSL *ssl;
+#ifdef ENABLE_HTTP3
+  struct {
+    ev_timer pkt_timer;
+    ngtcp2_conn *conn;
+    quic::Error last_error;
+    size_t max_pktlen;
+    bool close_requested;
+    FILE *qlog_file;
+  } quic;
+#endif // ENABLE_HTTP3
   ev_timer request_timeout_watcher;
   addrinfo *next_addr;
   // Address for the current address.  When try_new_connection() is
@@ -332,6 +364,7 @@ struct Client {
   // The client id per worker
   uint32_t id;
   int fd;
+  Address local_addr;
   ev_timer conn_active_watcher;
   ev_timer conn_inactivity_watcher;
   std::string selected_proto;
@@ -419,6 +452,37 @@ struct Client {
   void record_client_end_time();
 
   void signal_write();
+
+#ifdef ENABLE_HTTP3
+  // QUIC
+  int quic_init(const sockaddr *local_addr, socklen_t local_addrlen,
+                const sockaddr *remote_addr, socklen_t remote_addrlen);
+  void quic_free();
+  int read_quic();
+  int write_quic();
+  int write_udp(const sockaddr *addr, socklen_t addrlen, const uint8_t *data,
+                size_t datalen, size_t gso_size);
+  void quic_close_connection();
+
+  int quic_handshake_completed();
+  int quic_recv_stream_data(uint32_t flags, int64_t stream_id,
+                            const uint8_t *data, size_t datalen);
+  int quic_acked_stream_data_offset(int64_t stream_id, size_t datalen);
+  int quic_stream_close(int64_t stream_id, uint64_t app_error_code);
+  int quic_stream_reset(int64_t stream_id, uint64_t app_error_code);
+  int quic_stream_stop_sending(int64_t stream_id, uint64_t app_error_code);
+  int quic_extend_max_local_streams();
+
+  int quic_on_key(ngtcp2_crypto_level level, const uint8_t *rx_secret,
+                  const uint8_t *tx_secret, size_t secretlen);
+  void quic_set_tls_alert(uint8_t alert);
+
+  void quic_write_client_handshake(ngtcp2_crypto_level level,
+                                   const uint8_t *data, size_t datalen);
+  int quic_pkt_timeout();
+  void quic_restart_pkt_timer();
+  void quic_write_qlog(const void *data, size_t datalen);
+#endif // ENABLE_HTTP3
 };
 
 } // namespace h2load

src/h2load_http3_session.cc

@@ -0,0 +1,427 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * 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.
+ */
+#include "h2load_http3_session.h"
+
+#include <iostream>
+
+#include <ngtcp2/ngtcp2.h>
+
+#include "h2load.h"
+
+namespace h2load {
+
+Http3Session::Http3Session(Client *client)
+    : client_(client), conn_(nullptr), npending_request_(0), reqidx_(0) {}
+
+Http3Session::~Http3Session() { nghttp3_conn_del(conn_); }
+
+void Http3Session::on_connect() {}
+
+int Http3Session::submit_request() {
+  if (npending_request_) {
+    ++npending_request_;
+    return 0;
+  }
+
+  auto config = client_->worker->config;
+  reqidx_ = client_->reqidx;
+
+  if (++client_->reqidx == config->nva.size()) {
+    client_->reqidx = 0;
+  }
+
+  auto stream_id = submit_request_internal();
+  if (stream_id < 0) {
+    if (stream_id == NGTCP2_ERR_STREAM_ID_BLOCKED) {
+      ++npending_request_;
+      return 0;
+    }
+    return -1;
+  }
+
+  return 0;
+}
+
+namespace {
+nghttp3_ssize read_data(nghttp3_conn *conn, int64_t stream_id, nghttp3_vec *vec,
+                        size_t veccnt, uint32_t *pflags, void *user_data,
+                        void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+
+  s->read_data(vec, veccnt, pflags);
+
+  return 1;
+}
+} // namespace
+
+void Http3Session::read_data(nghttp3_vec *vec, size_t veccnt,
+                             uint32_t *pflags) {
+  assert(veccnt > 0);
+
+  auto config = client_->worker->config;
+
+  vec[0].base = config->data;
+  vec[0].len = config->data_length;
+  *pflags |= NGHTTP3_DATA_FLAG_EOF;
+}
+
+int64_t Http3Session::submit_request_internal() {
+  int rv;
+  int64_t stream_id;
+
+  auto config = client_->worker->config;
+  auto &nva = config->nva[reqidx_];
+
+  rv = ngtcp2_conn_open_bidi_stream(client_->quic.conn, &stream_id, nullptr);
+  if (rv != 0) {
+    return rv;
+  }
+
+  nghttp3_data_reader dr{};
+  dr.read_data = h2load::read_data;
+
+  rv = nghttp3_conn_submit_request(
+      conn_, stream_id, reinterpret_cast<nghttp3_nv *>(nva.data()), nva.size(),
+      config->data_fd == -1 ? nullptr : &dr, nullptr);
+  if (rv != 0) {
+    return rv;
+  }
+
+  client_->on_request(stream_id);
+  auto req_stat = client_->get_req_stat(stream_id);
+  assert(req_stat);
+  client_->record_request_time(req_stat);
+
+  return stream_id;
+}
+
+int Http3Session::on_read(const uint8_t *data, size_t len) { return -1; }
+
+int Http3Session::on_write() { return -1; }
+
+void Http3Session::terminate() {}
+
+size_t Http3Session::max_concurrent_streams() {
+  return (size_t)client_->worker->config->max_concurrent_streams;
+}
+
+namespace {
+int stream_close(nghttp3_conn *conn, int64_t stream_id, uint64_t app_error_code,
+                 void *user_data, void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+  if (s->stream_close(stream_id, app_error_code) != 0) {
+    return NGHTTP3_ERR_CALLBACK_FAILURE;
+  }
+  return 0;
+}
+} // namespace
+
+int Http3Session::stream_close(int64_t stream_id, uint64_t app_error_code) {
+  if (!ngtcp2_is_bidi_stream(stream_id)) {
+    assert(!ngtcp2_conn_is_local_stream(client_->quic.conn, stream_id));
+    ngtcp2_conn_extend_max_streams_uni(client_->quic.conn, 1);
+  }
+  client_->on_stream_close(stream_id, app_error_code == NGHTTP3_H3_NO_ERROR);
+  return 0;
+}
+
+namespace {
+int recv_data(nghttp3_conn *conn, int64_t stream_id, const uint8_t *data,
+              size_t datalen, void *user_data, void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+  s->recv_data(stream_id, data, datalen);
+  return 0;
+}
+} // namespace
+
+void Http3Session::recv_data(int64_t stream_id, const uint8_t *data,
+                             size_t datalen) {
+  client_->record_ttfb();
+  client_->worker->stats.bytes_body += datalen;
+  consume(stream_id, datalen);
+}
+
+namespace {
+int deferred_consume(nghttp3_conn *conn, int64_t stream_id, size_t nconsumed,
+                     void *user_data, void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+  s->consume(stream_id, nconsumed);
+  return 0;
+}
+} // namespace
+
+void Http3Session::consume(int64_t stream_id, size_t nconsumed) {
+  ngtcp2_conn_extend_max_stream_offset(client_->quic.conn, stream_id,
+                                       nconsumed);
+  ngtcp2_conn_extend_max_offset(client_->quic.conn, nconsumed);
+}
+
+namespace {
+int begin_headers(nghttp3_conn *conn, int64_t stream_id, void *user_data,
+                  void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+  s->begin_headers(stream_id);
+  return 0;
+}
+} // namespace
+
+void Http3Session::begin_headers(int64_t stream_id) {
+  auto payloadlen = nghttp3_conn_get_frame_payload_left(conn_, stream_id);
+  assert(payloadlen > 0);
+
+  client_->worker->stats.bytes_head += payloadlen;
+}
+
+namespace {
+int recv_header(nghttp3_conn *conn, int64_t stream_id, int32_t token,
+                nghttp3_rcbuf *name, nghttp3_rcbuf *value, uint8_t flags,
+                void *user_data, void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+  auto k = nghttp3_rcbuf_get_buf(name);
+  auto v = nghttp3_rcbuf_get_buf(value);
+  s->recv_header(stream_id, &k, &v);
+  return 0;
+}
+} // namespace
+
+void Http3Session::recv_header(int64_t stream_id, const nghttp3_vec *name,
+                               const nghttp3_vec *value) {
+  client_->on_header(stream_id, name->base, name->len, value->base, value->len);
+  client_->worker->stats.bytes_head_decomp += name->len + value->len;
+}
+
+namespace {
+int send_stop_sending(nghttp3_conn *conn, int64_t stream_id,
+                      uint64_t app_error_code, void *user_data,
+                      void *stream_user_data) {
+  auto s = static_cast<Http3Session *>(user_data);
+  if (s->send_stop_sending(stream_id, app_error_code) != 0) {
+    return NGHTTP3_ERR_CALLBACK_FAILURE;
+  }
+  return 0;
+}
+} // namespace
+
+int Http3Session::send_stop_sending(int64_t stream_id,
+                                    uint64_t app_error_code) {
+  auto rv = ngtcp2_conn_shutdown_stream_read(client_->quic.conn, stream_id,
+                                             app_error_code);
+  if (rv != 0) {
+    std::cerr << "ngtcp2_conn_shutdown_stream_read: " << ngtcp2_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+  return 0;
+}
+
+int Http3Session::close_stream(int64_t stream_id, uint64_t app_error_code) {
+  auto rv = nghttp3_conn_close_stream(conn_, stream_id, app_error_code);
+  switch (rv) {
+  case 0:
+    return 0;
+  case NGHTTP3_ERR_STREAM_NOT_FOUND:
+    if (!ngtcp2_is_bidi_stream(stream_id)) {
+      assert(!ngtcp2_conn_is_local_stream(client_->quic.conn, stream_id));
+      ngtcp2_conn_extend_max_streams_uni(client_->quic.conn, 1);
+    }
+    return 0;
+  default:
+    return -1;
+  }
+}
+
+int Http3Session::shutdown_stream_read(int64_t stream_id) {
+  auto rv = nghttp3_conn_shutdown_stream_read(conn_, stream_id);
+  if (rv != 0) {
+    return -1;
+  }
+  return 0;
+}
+
+int Http3Session::extend_max_local_streams() {
+  auto config = client_->worker->config;
+
+  for (; npending_request_; --npending_request_) {
+    auto stream_id = submit_request_internal();
+    if (stream_id < 0) {
+      if (stream_id == NGTCP2_ERR_STREAM_ID_BLOCKED) {
+        return 0;
+      }
+      return -1;
+    }
+
+    if (++reqidx_ == config->nva.size()) {
+      reqidx_ = 0;
+    }
+  }
+
+  return 0;
+}
+
+int Http3Session::init_conn() {
+  int rv;
+
+  assert(conn_ == nullptr);
+
+  if (ngtcp2_conn_get_max_local_streams_uni(client_->quic.conn) < 3) {
+    return -1;
+  }
+
+  nghttp3_callbacks callbacks{
+      nullptr, // acked_stream_data
+      h2load::stream_close,
+      h2load::recv_data,
+      h2load::deferred_consume,
+      h2load::begin_headers,
+      h2load::recv_header,
+      nullptr, // end_headers
+      nullptr, // begin_trailers
+      h2load::recv_header,
+      nullptr, // end_trailers
+      h2load::send_stop_sending,
+  };
+
+  auto config = client_->worker->config;
+
+  nghttp3_settings settings;
+  nghttp3_settings_default(&settings);
+  settings.qpack_max_table_capacity = config->header_table_size;
+  settings.qpack_blocked_streams = 100;
+
+  auto mem = nghttp3_mem_default();
+
+  rv = nghttp3_conn_client_new(&conn_, &callbacks, &settings, mem, this);
+  if (rv != 0) {
+    std::cerr << "nghttp3_conn_client_new: " << nghttp3_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+
+  int64_t ctrl_stream_id;
+
+  rv = ngtcp2_conn_open_uni_stream(client_->quic.conn, &ctrl_stream_id, NULL);
+  if (rv != 0) {
+    std::cerr << "ngtcp2_conn_open_uni_stream: " << ngtcp2_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+
+  rv = nghttp3_conn_bind_control_stream(conn_, ctrl_stream_id);
+  if (rv != 0) {
+    std::cerr << "nghttp3_conn_bind_control_stream: " << nghttp3_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+
+  int64_t qpack_enc_stream_id, qpack_dec_stream_id;
+
+  rv = ngtcp2_conn_open_uni_stream(client_->quic.conn, &qpack_enc_stream_id,
+                                   NULL);
+  if (rv != 0) {
+    std::cerr << "ngtcp2_conn_open_uni_stream: " << ngtcp2_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+
+  rv = ngtcp2_conn_open_uni_stream(client_->quic.conn, &qpack_dec_stream_id,
+                                   NULL);
+  if (rv != 0) {
+    std::cerr << "ngtcp2_conn_open_uni_stream: " << ngtcp2_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+
+  rv = nghttp3_conn_bind_qpack_streams(conn_, qpack_enc_stream_id,
+                                       qpack_dec_stream_id);
+  if (rv != 0) {
+    std::cerr << "nghttp3_conn_bind_qpack_streams: " << nghttp3_strerror(rv)
+              << std::endl;
+    return -1;
+  }
+
+  return 0;
+}
+
+ssize_t Http3Session::read_stream(uint32_t flags, int64_t stream_id,
+                                  const uint8_t *data, size_t datalen) {
+  auto nconsumed = nghttp3_conn_read_stream(
+      conn_, stream_id, data, datalen, flags & NGTCP2_STREAM_DATA_FLAG_FIN);
+  if (nconsumed < 0) {
+    std::cerr << "nghttp3_conn_read_stream: " << nghttp3_strerror(nconsumed)
+              << std::endl;
+    client_->quic.last_error = quic::err_application(nconsumed);
+    return -1;
+  }
+  return nconsumed;
+}
+
+ssize_t Http3Session::write_stream(int64_t &stream_id, int &fin,
+                                   nghttp3_vec *vec, size_t veccnt) {
+  auto sveccnt =
+      nghttp3_conn_writev_stream(conn_, &stream_id, &fin, vec, veccnt);
+  if (sveccnt < 0) {
+    client_->quic.last_error = quic::err_application(sveccnt);
+    return -1;
+  }
+  return sveccnt;
+}
+
+int Http3Session::block_stream(int64_t stream_id) {
+  auto rv = nghttp3_conn_block_stream(conn_, stream_id);
+  if (rv != 0) {
+    client_->quic.last_error = quic::err_application(rv);
+    return -1;
+  }
+  return 0;
+}
+
+int Http3Session::shutdown_stream_write(int64_t stream_id) {
+  auto rv = nghttp3_conn_shutdown_stream_write(conn_, stream_id);
+  if (rv != 0) {
+    client_->quic.last_error = quic::err_application(rv);
+    return -1;
+  }
+  return 0;
+}
+
+int Http3Session::add_write_offset(int64_t stream_id, size_t ndatalen) {
+  auto rv = nghttp3_conn_add_write_offset(conn_, stream_id, ndatalen);
+  if (rv != 0) {
+    client_->quic.last_error = quic::err_application(rv);
+    return -1;
+  }
+  return 0;
+}
+
+int Http3Session::add_ack_offset(int64_t stream_id, size_t datalen) {
+  auto rv = nghttp3_conn_add_ack_offset(conn_, stream_id, datalen);
+  if (rv != 0) {
+    client_->quic.last_error = quic::err_application(rv);
+    return -1;
+  }
+  return 0;
+}
+
+} // namespace h2load

src/h2load_http3_session.h

@@ -0,0 +1,81 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * 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 H2LOAD_HTTP3_SESSION_H
+#define H2LOAD_HTTP3_SESSION_H
+
+#include "h2load_session.h"
+
+#include <nghttp3/nghttp3.h>
+
+namespace h2load {
+
+struct Client;
+
+class Http3Session : public Session {
+public:
+  Http3Session(Client *client);
+  virtual ~Http3Session();
+  virtual void on_connect();
+  virtual int submit_request();
+  virtual int on_read(const uint8_t *data, size_t len);
+  virtual int on_write();
+  virtual void terminate();
+  virtual size_t max_concurrent_streams();
+
+  int init_conn();
+  int stream_close(int64_t stream_id, uint64_t app_error_code);
+  void recv_data(int64_t stream_id, const uint8_t *data, size_t datalen);
+  void consume(int64_t stream_id, size_t nconsumed);
+  void begin_headers(int64_t stream_id);
+  void recv_header(int64_t stream_id, const nghttp3_vec *name,
+                   const nghttp3_vec *value);
+  int send_stop_sending(int64_t stream_id, uint64_t app_error_code);
+
+  int close_stream(int64_t stream_id, uint64_t app_error_code);
+  int shutdown_stream_read(int64_t stream_id);
+  int extend_max_local_streams();
+  int64_t submit_request_internal();
+
+  ssize_t read_stream(uint32_t flags, int64_t stream_id, const uint8_t *data,
+                      size_t datalen);
+  ssize_t write_stream(int64_t &stream_id, int &fin, nghttp3_vec *vec,
+                       size_t veccnt);
+  int block_stream(int64_t stream_id);
+  int shutdown_stream_write(int64_t stream_id);
+  int add_write_offset(int64_t stream_id, size_t ndatalen);
+  int add_ack_offset(int64_t stream_id, size_t datalen);
+
+  void read_data(nghttp3_vec *vec, size_t veccnt, uint32_t *pflags);
+
+private:
+  Client *client_;
+  nghttp3_conn *conn_;
+  size_t npending_request_;
+  size_t reqidx_;
+};
+
+} // namespace h2load
+
+#endif // H2LOAD_HTTP3_SESSION_H

src/h2load_quic.cc

@@ -0,0 +1,679 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * 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.
+ */
+#include "h2load_quic.h"
+
+#include <netinet/udp.h>
+
+#include <iostream>
+
+#include <ngtcp2/ngtcp2_crypto_openssl.h>
+
+#include <openssl/err.h>
+
+#include "h2load_http3_session.h"
+
+namespace h2load {
+
+namespace {
+auto randgen = util::make_mt19937();
+} // namespace
+
+namespace {
+int handshake_completed(ngtcp2_conn *conn, void *user_data) {
+  auto c = static_cast<Client *>(user_data);
+
+  if (c->quic_handshake_completed() != 0) {
+    return NGTCP2_ERR_CALLBACK_FAILURE;
+  }
+
+  return 0;
+}
+} // namespace
+
+int Client::quic_handshake_completed() { return connection_made(); }
+
+namespace {
+int recv_stream_data(ngtcp2_conn *conn, uint32_t flags, int64_t stream_id,
+                     uint64_t offset, const uint8_t *data, size_t datalen,
+                     void *user_data, void *stream_user_data) {
+  auto c = static_cast<Client *>(user_data);
+  if (c->quic_recv_stream_data(flags, stream_id, data, datalen) != 0) {
+    // TODO Better to do this gracefully rather than
+    // NGTCP2_ERR_CALLBACK_FAILURE.  Perhaps, call
+    // ngtcp2_conn_write_application_close() ?
+    return NGTCP2_ERR_CALLBACK_FAILURE;
+  }
+  return 0;
+}
+} // namespace
+
+int Client::quic_recv_stream_data(uint32_t flags, int64_t stream_id,
+                                  const uint8_t *data, size_t datalen) {
+  if (worker->current_phase == Phase::MAIN_DURATION) {
+    worker->stats.bytes_total += datalen;
+  }
+
+  auto s = static_cast<Http3Session *>(session.get());
+  auto nconsumed = s->read_stream(flags, stream_id, data, datalen);
+  if (nconsumed == -1) {
+    return -1;
+  }
+
+  ngtcp2_conn_extend_max_stream_offset(quic.conn, stream_id, nconsumed);
+  ngtcp2_conn_extend_max_offset(quic.conn, nconsumed);
+
+  return 0;
+}
+
+namespace {
+int acked_stream_data_offset(ngtcp2_conn *conn, int64_t stream_id,
+                             uint64_t offset, uint64_t datalen, void *user_data,
+                             void *stream_user_data) {
+  auto c = static_cast<Client *>(user_data);
+  if (c->quic_acked_stream_data_offset(stream_id, datalen) != 0) {
+    return NGTCP2_ERR_CALLBACK_FAILURE;
+  }
+  return 0;
+}
+} // namespace
+
+int Client::quic_acked_stream_data_offset(int64_t stream_id, size_t datalen) {
+  auto s = static_cast<Http3Session *>(session.get());
+  if (s->add_ack_offset(stream_id, datalen) != 0) {
+    return -1;
+  }
+  return 0;
+}
+
+namespace {
+int stream_close(ngtcp2_conn *conn, int64_t stream_id, uint64_t app_error_code,
+                 void *user_data, void *stream_user_data) {
+  auto c = static_cast<Client *>(user_data);
+  if (c->quic_stream_close(stream_id, app_error_code) != 0) {
+    return -1;
+  }
+  return 0;
+}
+} // namespace
+
+int Client::quic_stream_close(int64_t stream_id, uint64_t app_error_code) {
+  auto s = static_cast<Http3Session *>(session.get());
+  if (s->close_stream(stream_id, app_error_code == 0 ? NGHTTP3_H3_NO_ERROR
+                                                     : app_error_code) != 0) {
+    return -1;
+  }
+  return 0;
+}
+
+namespace {
+int stream_reset(ngtcp2_conn *conn, int64_t stream_id, uint64_t final_size,
+                 uint64_t app_error_code, void *user_data,
+                 void *stream_user_data) {
+  auto c = static_cast<Client *>(user_data);
+  if (c->quic_stream_reset(stream_id, app_error_code) != 0) {
+    return -1;
+  }
+  return 0;
+}
+} // namespace
+
+int Client::quic_stream_reset(int64_t stream_id, uint64_t app_error_code) {
+  auto s = static_cast<Http3Session *>(session.get());
+  if (s->shutdown_stream_read(stream_id) != 0) {
+    return -1;
+  }
+  return 0;
+}
+
+namespace {
+int stream_stop_sending(ngtcp2_conn *conn, int64_t stream_id,
+                        uint64_t app_error_code, void *user_data,
+                        void *stream_user_data) {
+  auto c = static_cast<Client *>(user_data);
+  if (c->quic_stream_stop_sending(stream_id, app_error_code) != 0) {
+    return -1;
+  }
+  return 0;
+}
+} // namespace
+
+int Client::quic_stream_stop_sending(int64_t stream_id,
+                                     uint64_t app_error_code) {
+  auto s = static_cast<Http3Session *>(session.get());
+  if (s->shutdown_stream_read(stream_id) != 0) {
+    return -1;
+  }
+  return 0;
+}
+
+namespace {
+int extend_max_local_streams_bidi(ngtcp2_conn *conn, uint64_t max_streams,
+                                  void *user_data) {
+  auto c = static_cast<Client *>(user_data);
+
+  if (c->quic_extend_max_local_streams() != 0) {
+    return NGTCP2_ERR_CALLBACK_FAILURE;
+  }
+
+  return 0;
+}
+} // namespace
+
+int Client::quic_extend_max_local_streams() {
+  auto s = static_cast<Http3Session *>(session.get());
+  if (s->extend_max_local_streams() != 0) {
+    return NGTCP2_ERR_CALLBACK_FAILURE;
+  }
+  return 0;
+}
+
+namespace {
+int get_new_connection_id(ngtcp2_conn *conn, ngtcp2_cid *cid, uint8_t *token,
+                          size_t cidlen, void *user_data) {
+  auto dis = std::uniform_int_distribution<uint8_t>(
+      0, std::numeric_limits<uint8_t>::max());
+  auto f = [&dis]() { return dis(randgen); };
+
+  std::generate_n(cid->data, cidlen, f);
+  cid->datalen = cidlen;
+  std::generate_n(token, NGTCP2_STATELESS_RESET_TOKENLEN, f);
+
+  return 0;
+}
+} // namespace
+
+namespace {
+void debug_log_printf(void *user_data, const char *fmt, ...) {
+  va_list ap;
+
+  va_start(ap, fmt);
+  vfprintf(stderr, fmt, ap);
+  va_end(ap);
+
+  fprintf(stderr, "\n");
+}
+} // namespace
+
+namespace {
+void generate_cid(ngtcp2_cid &dest) {
+  auto dis = std::uniform_int_distribution<uint8_t>(
+      0, std::numeric_limits<uint8_t>::max());
+  dest.datalen = 8;
+  std::generate_n(dest.data, dest.datalen, [&dis]() { return dis(randgen); });
+}
+} // namespace
+
+namespace {
+ngtcp2_tstamp timestamp(struct ev_loop *loop) {
+  return ev_now(loop) * NGTCP2_SECONDS;
+}
+} // namespace
+
+namespace {
+int set_encryption_secrets(SSL *ssl, OSSL_ENCRYPTION_LEVEL ossl_level,
+                           const uint8_t *rx_secret, const uint8_t *tx_secret,
+                           size_t secret_len) {
+  auto c = static_cast<Client *>(SSL_get_app_data(ssl));
+
+  if (c->quic_on_key(
+          ngtcp2_crypto_openssl_from_ossl_encryption_level(ossl_level),
+          rx_secret, tx_secret, secret_len) != 0) {
+    return 0;
+  }
+
+  return 1;
+}
+} // namespace
+
+namespace {
+int add_handshake_data(SSL *ssl, OSSL_ENCRYPTION_LEVEL ossl_level,
+                       const uint8_t *data, size_t len) {
+  auto c = static_cast<Client *>(SSL_get_app_data(ssl));
+  c->quic_write_client_handshake(
+      ngtcp2_crypto_openssl_from_ossl_encryption_level(ossl_level), data, len);
+  return 1;
+}
+} // namespace
+
+namespace {
+int flush_flight(SSL *ssl) { return 1; }
+} // namespace
+
+namespace {
+int send_alert(SSL *ssl, enum ssl_encryption_level_t level, uint8_t alert) {
+  auto c = static_cast<Client *>(SSL_get_app_data(ssl));
+  c->quic_set_tls_alert(alert);
+  return 1;
+}
+} // namespace
+
+namespace {
+auto quic_method = SSL_QUIC_METHOD{
+    set_encryption_secrets,
+    add_handshake_data,
+    flush_flight,
+    send_alert,
+};
+} // namespace
+
+// qlog write callback -- excerpted from ngtcp2/examples/client_base.cc
+namespace {
+void qlog_write_cb(void *user_data, uint32_t flags, const void *data,
+                   size_t datalen) {
+  auto c = static_cast<Client *>(user_data);
+  c->quic_write_qlog(data, datalen);
+}
+} // namespace
+
+void Client::quic_write_qlog(const void *data, size_t datalen) {
+  assert(quic.qlog_file != nullptr);
+  fwrite(data, 1, datalen, quic.qlog_file);
+}
+
+int Client::quic_init(const sockaddr *local_addr, socklen_t local_addrlen,
+                      const sockaddr *remote_addr, socklen_t remote_addrlen) {
+  int rv;
+
+  if (!ssl) {
+    ssl = SSL_new(worker->ssl_ctx);
+
+    SSL_set_app_data(ssl, this);
+    SSL_set_connect_state(ssl);
+    SSL_set_quic_method(ssl, &quic_method);
+  }
+
+  switch (remote_addr->sa_family) {
+  case AF_INET:
+    quic.max_pktlen = NGTCP2_MAX_PKTLEN_IPV4;
+    break;
+  case AF_INET6:
+    quic.max_pktlen = NGTCP2_MAX_PKTLEN_IPV6;
+    break;
+  default:
+    return -1;
+  }
+
+  auto callbacks = ngtcp2_callbacks{
+      ngtcp2_crypto_client_initial_cb,
+      nullptr, // recv_client_initial
+      ngtcp2_crypto_recv_crypto_data_cb,
+      h2load::handshake_completed,
+      nullptr, // recv_version_negotiation
+      ngtcp2_crypto_encrypt_cb,
+      ngtcp2_crypto_decrypt_cb,
+      ngtcp2_crypto_hp_mask_cb,
+      h2load::recv_stream_data,
+      h2load::acked_stream_data_offset,
+      nullptr, // stream_open
+      h2load::stream_close,
+      nullptr, // recv_stateless_reset
+      ngtcp2_crypto_recv_retry_cb,
+      h2load::extend_max_local_streams_bidi,
+      nullptr, // extend_max_local_streams_uni
+      nullptr, // rand
+      get_new_connection_id,
+      nullptr, // remove_connection_id
+      ngtcp2_crypto_update_key_cb,
+      nullptr, // path_validation
+      nullptr, // select_preferred_addr
+      h2load::stream_reset,
+      nullptr, // extend_max_remote_streams_bidi
+      nullptr, // extend_max_remote_streams_uni
+      nullptr, // extend_max_stream_data
+      nullptr, // dcid_status
+      nullptr, // handshake_confirmed
+      nullptr, // recv_new_token
+      ngtcp2_crypto_delete_crypto_aead_ctx_cb,
+      ngtcp2_crypto_delete_crypto_cipher_ctx_cb,
+      nullptr, // recv_datagram
+      nullptr, // ack_datagram
+      nullptr, // lost_datagram
+      nullptr, // get_path_challenge_data
+      h2load::stream_stop_sending,
+  };
+
+  ngtcp2_cid scid, dcid;
+  generate_cid(scid);
+  generate_cid(dcid);
+
+  auto config = worker->config;
+
+  ngtcp2_settings settings;
+  ngtcp2_settings_default(&settings);
+  if (config->verbose) {
+    settings.log_printf = debug_log_printf;
+  }
+  settings.initial_ts = timestamp(worker->loop);
+  if (!config->qlog_file_base.empty()) {
+    assert(quic.qlog_file == nullptr);
+    auto path = config->qlog_file_base;
+    path += '.';
+    path += util::utos(worker->id);
+    path += '.';
+    path += util::utos(id);
+    path += ".qlog";
+    quic.qlog_file = fopen(path.c_str(), "w");
+    if (quic.qlog_file == nullptr) {
+      std::cerr << "Failed to open a qlog file: " << path << std::endl;
+      return -1;
+    }
+    settings.qlog.write = qlog_write_cb;
+  }
+
+  ngtcp2_transport_params params;
+  ngtcp2_transport_params_default(&params);
+  auto max_stream_data =
+      std::min((1 << 26) - 1, (1 << config->window_bits) - 1);
+  params.initial_max_stream_data_bidi_local = max_stream_data;
+  params.initial_max_stream_data_uni = max_stream_data;
+  params.initial_max_data = (1 << config->connection_window_bits) - 1;
+  params.initial_max_streams_bidi = 0;
+  params.initial_max_streams_uni = 100;
+  params.max_idle_timeout = 30 * NGTCP2_SECONDS;
+
+  auto path = ngtcp2_path{
+      {local_addrlen, const_cast<sockaddr *>(local_addr)},
+      {remote_addrlen, const_cast<sockaddr *>(remote_addr)},
+  };
+
+  assert(config->npn_list.size());
+
+  uint32_t quic_version;
+
+  if (config->npn_list[0] == NGHTTP3_ALPN_H3) {
+    quic_version = NGTCP2_PROTO_VER_V1;
+  } else {
+    quic_version = NGTCP2_PROTO_VER_MIN;
+  }
+
+  rv = ngtcp2_conn_client_new(&quic.conn, &dcid, &scid, &path, quic_version,
+                              &callbacks, &settings, &params, nullptr, this);
+  if (rv != 0) {
+    return -1;
+  }
+
+  ngtcp2_conn_set_tls_native_handle(quic.conn, ssl);
+
+  return 0;
+}
+
+void Client::quic_free() {
+  ngtcp2_conn_del(quic.conn);
+  if (quic.qlog_file != nullptr) {
+    fclose(quic.qlog_file);
+    quic.qlog_file = nullptr;
+  }
+}
+
+void Client::quic_close_connection() {
+  if (!quic.conn) {
+    return;
+  }
+
+  std::array<uint8_t, 1500> buf;
+  ngtcp2_ssize nwrite;
+  ngtcp2_path_storage ps;
+  ngtcp2_path_storage_zero(&ps);
+
+  switch (quic.last_error.type) {
+  case quic::ErrorType::TransportVersionNegotiation:
+    return;
+  case quic::ErrorType::Transport:
+    nwrite = ngtcp2_conn_write_connection_close(
+        quic.conn, &ps.path, nullptr, buf.data(), quic.max_pktlen,
+        quic.last_error.code, timestamp(worker->loop));
+    break;
+  case quic::ErrorType::Application:
+    nwrite = ngtcp2_conn_write_application_close(
+        quic.conn, &ps.path, nullptr, buf.data(), quic.max_pktlen,
+        quic.last_error.code, timestamp(worker->loop));
+    break;
+  default:
+    assert(0);
+  }
+
+  if (nwrite < 0) {
+    return;
+  }
+
+  write_udp(reinterpret_cast<sockaddr *>(ps.path.remote.addr),
+            ps.path.remote.addrlen, buf.data(), nwrite, 0);
+}
+
+int Client::quic_on_key(ngtcp2_crypto_level level, const uint8_t *rx_secret,
+                        const uint8_t *tx_secret, size_t secretlen) {
+  if (ngtcp2_crypto_derive_and_install_rx_key(quic.conn, nullptr, nullptr,
+                                              nullptr, level, rx_secret,
+                                              secretlen) != 0) {
+    std::cerr << "ngtcp2_crypto_derive_and_install_rx_key() failed"
+              << std::endl;
+    return -1;
+  }
+
+  if (ngtcp2_crypto_derive_and_install_tx_key(quic.conn, nullptr, nullptr,
+                                              nullptr, level, tx_secret,
+                                              secretlen) != 0) {
+    std::cerr << "ngtcp2_crypto_derive_and_install_tx_key() failed"
+              << std::endl;
+    return -1;
+  }
+
+  if (level == NGTCP2_CRYPTO_LEVEL_APPLICATION) {
+    auto s = std::make_unique<Http3Session>(this);
+    if (s->init_conn() == -1) {
+      return -1;
+    }
+    session = std::move(s);
+  }
+
+  return 0;
+}
+
+void Client::quic_set_tls_alert(uint8_t alert) {
+  quic.last_error = quic::err_transport_tls(alert);
+}
+
+void Client::quic_write_client_handshake(ngtcp2_crypto_level level,
+                                         const uint8_t *data, size_t datalen) {
+  assert(level < 2);
+
+  ngtcp2_conn_submit_crypto_data(quic.conn, level, data, datalen);
+}
+
+void quic_pkt_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents) {
+  auto c = static_cast<Client *>(w->data);
+
+  if (c->quic_pkt_timeout() != 0) {
+    c->fail();
+    c->worker->free_client(c);
+    delete c;
+    return;
+  }
+}
+
+int Client::quic_pkt_timeout() {
+  int rv;
+  auto now = timestamp(worker->loop);
+
+  rv = ngtcp2_conn_handle_expiry(quic.conn, now);
+  if (rv != 0) {
+    quic.last_error = quic::err_transport(NGTCP2_ERR_INTERNAL);
+    return -1;
+  }
+
+  return write_quic();
+}
+
+void Client::quic_restart_pkt_timer() {
+  auto expiry = ngtcp2_conn_get_expiry(quic.conn);
+  auto now = timestamp(worker->loop);
+  auto t = expiry > now ? static_cast<ev_tstamp>(expiry - now) / NGTCP2_SECONDS
+                        : 1e-9;
+  quic.pkt_timer.repeat = t;
+  ev_timer_again(worker->loop, &quic.pkt_timer);
+}
+
+int Client::read_quic() {
+  std::array<uint8_t, 65536> buf;
+  sockaddr_union su;
+  socklen_t addrlen = sizeof(su);
+  int rv;
+  size_t pktcnt = 0;
+  ngtcp2_pkt_info pi{};
+
+  for (;;) {
+    auto nread =
+        recvfrom(fd, buf.data(), buf.size(), MSG_DONTWAIT, &su.sa, &addrlen);
+    if (nread == -1) {
+      return 0;
+    }
+
+    assert(quic.conn);
+
+    ++worker->stats.udp_dgram_recv;
+
+    auto path = ngtcp2_path{
+        {local_addr.len, &local_addr.su.sa},
+        {addrlen, &su.sa},
+    };
+
+    rv = ngtcp2_conn_read_pkt(quic.conn, &path, &pi, buf.data(), nread,
+                              timestamp(worker->loop));
+    if (rv != 0) {
+      std::cerr << "ngtcp2_conn_read_pkt: " << ngtcp2_strerror(rv) << std::endl;
+      return -1;
+    }
+
+    if (++pktcnt == 100) {
+      break;
+    }
+  }
+
+  return 0;
+}
+
+int Client::write_quic() {
+  ev_io_stop(worker->loop, &wev);
+
+  if (quic.close_requested) {
+    return -1;
+  }
+
+  std::array<nghttp3_vec, 16> vec;
+  size_t pktcnt = 0;
+  size_t max_pktcnt =
+#ifdef UDP_SEGMENT
+      worker->config->no_udp_gso
+          ? 1
+          : std::min(static_cast<size_t>(10),
+                     static_cast<size_t>(64_k / quic.max_pktlen));
+#else  // !UDP_SEGMENT
+      1;
+#endif // !UDP_SEGMENT
+  std::array<uint8_t, 64_k> buf;
+  uint8_t *bufpos = buf.data();
+  ngtcp2_path_storage ps;
+
+  ngtcp2_path_storage_zero(&ps);
+
+  auto s = static_cast<Http3Session *>(session.get());
+
+  for (;;) {
+    int64_t stream_id = -1;
+    int fin = 0;
+    ssize_t sveccnt = 0;
+
+    if (session && ngtcp2_conn_get_max_data_left(quic.conn)) {
+      sveccnt = s->write_stream(stream_id, fin, vec.data(), vec.size());
+      if (sveccnt == -1) {
+        return -1;
+      }
+    }
+
+    ngtcp2_ssize ndatalen;
+    auto v = vec.data();
+    auto vcnt = static_cast<size_t>(sveccnt);
+
+    uint32_t flags = NGTCP2_WRITE_STREAM_FLAG_MORE;
+    if (fin) {
+      flags |= NGTCP2_WRITE_STREAM_FLAG_FIN;
+    }
+
+    auto nwrite = ngtcp2_conn_writev_stream(
+        quic.conn, &ps.path, nullptr, bufpos, quic.max_pktlen, &ndatalen, flags,
+        stream_id, reinterpret_cast<const ngtcp2_vec *>(v), vcnt,
+        timestamp(worker->loop));
+    if (nwrite < 0) {
+      switch (nwrite) {
+      case NGTCP2_ERR_STREAM_DATA_BLOCKED:
+        assert(ndatalen == -1);
+        if (s->block_stream(stream_id) != 0) {
+          return -1;
+        }
+        continue;
+      case NGTCP2_ERR_STREAM_SHUT_WR:
+        assert(ndatalen == -1);
+        if (s->shutdown_stream_write(stream_id) != 0) {
+          return -1;
+        }
+        continue;
+      case NGTCP2_ERR_WRITE_MORE:
+        assert(ndatalen >= 0);
+        if (s->add_write_offset(stream_id, ndatalen) != 0) {
+          return -1;
+        }
+        continue;
+      }
+
+      quic.last_error = quic::err_transport(nwrite);
+      return -1;
+    } else if (ndatalen >= 0 && s->add_write_offset(stream_id, ndatalen) != 0) {
+      return -1;
+    }
+
+    quic_restart_pkt_timer();
+
+    if (nwrite == 0) {
+      if (bufpos - buf.data()) {
+        write_udp(ps.path.remote.addr, ps.path.remote.addrlen, buf.data(),
+                  bufpos - buf.data(), quic.max_pktlen);
+      }
+      return 0;
+    }
+
+    bufpos += nwrite;
+
+    // Assume that the path does not change.
+    if (++pktcnt == max_pktcnt ||
+        static_cast<size_t>(nwrite) < quic.max_pktlen) {
+      write_udp(ps.path.remote.addr, ps.path.remote.addrlen, buf.data(),
+                bufpos - buf.data(), quic.max_pktlen);
+      signal_write();
+      return 0;
+    }
+  }
+}
+
+} // namespace h2load

src/h2load_quic.h

@@ -0,0 +1,38 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * 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 H2LOAD_QUIC_H
+#define H2LOAD_QUIC_H
+
+#include "nghttp2_config.h"
+
+#include <ev.h>
+
+#include "h2load.h"
+
+namespace h2load {
+void quic_pkt_timeout_cb(struct ev_loop *loop, ev_timer *w, int revents);
+} // namespace h2load
+
+#endif // H2LOAD_QUIC_H

src/http3.cc

@@ -0,0 +1,215 @@
+/*
+ * 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.
+ */
+#include "http3.h"
+
+namespace nghttp2 {
+
+namespace http3 {
+
+namespace {
+nghttp3_nv make_nv_internal(const std::string &name, const std::string &value,
+                            bool never_index, uint8_t nv_flags) {
+  uint8_t flags;
+
+  flags = nv_flags |
+          (never_index ? NGHTTP3_NV_FLAG_NEVER_INDEX : NGHTTP3_NV_FLAG_NONE);
+
+  return {(uint8_t *)name.c_str(), (uint8_t *)value.c_str(), name.size(),
+          value.size(), flags};
+}
+} // namespace
+
+namespace {
+nghttp3_nv make_nv_internal(const StringRef &name, const StringRef &value,
+                            bool never_index, uint8_t nv_flags) {
+  uint8_t flags;
+
+  flags = nv_flags |
+          (never_index ? NGHTTP3_NV_FLAG_NEVER_INDEX : NGHTTP3_NV_FLAG_NONE);
+
+  return {(uint8_t *)name.c_str(), (uint8_t *)value.c_str(), name.size(),
+          value.size(), flags};
+}
+} // namespace
+
+nghttp3_nv make_nv(const std::string &name, const std::string &value,
+                   bool never_index) {
+  return make_nv_internal(name, value, never_index, NGHTTP3_NV_FLAG_NONE);
+}
+
+nghttp3_nv make_nv(const StringRef &name, const StringRef &value,
+                   bool never_index) {
+  return make_nv_internal(name, value, never_index, NGHTTP3_NV_FLAG_NONE);
+}
+
+nghttp3_nv make_nv_nocopy(const std::string &name, const std::string &value,
+                          bool never_index) {
+  return make_nv_internal(name, value, never_index,
+                          NGHTTP3_NV_FLAG_NO_COPY_NAME |
+                              NGHTTP3_NV_FLAG_NO_COPY_VALUE);
+}
+
+nghttp3_nv make_nv_nocopy(const StringRef &name, const StringRef &value,
+                          bool never_index) {
+  return make_nv_internal(name, value, never_index,
+                          NGHTTP3_NV_FLAG_NO_COPY_NAME |
+                              NGHTTP3_NV_FLAG_NO_COPY_VALUE);
+}
+
+namespace {
+void copy_headers_to_nva_internal(std::vector<nghttp3_nv> &nva,
+                                  const HeaderRefs &headers, uint8_t nv_flags,
+                                  uint32_t flags) {
+  auto it_forwarded = std::end(headers);
+  auto it_xff = std::end(headers);
+  auto it_xfp = std::end(headers);
+  auto it_via = std::end(headers);
+
+  for (auto it = std::begin(headers); it != std::end(headers); ++it) {
+    auto kv = &(*it);
+    if (kv->name.empty() || kv->name[0] == ':') {
+      continue;
+    }
+    switch (kv->token) {
+    case http2::HD_COOKIE:
+    case http2::HD_CONNECTION:
+    case http2::HD_HOST:
+    case http2::HD_HTTP2_SETTINGS:
+    case http2::HD_KEEP_ALIVE:
+    case http2::HD_PROXY_CONNECTION:
+    case http2::HD_SERVER:
+    case http2::HD_TE:
+    case http2::HD_TRANSFER_ENCODING:
+    case http2::HD_UPGRADE:
+      continue;
+    case http2::HD_EARLY_DATA:
+      if (flags & http2::HDOP_STRIP_EARLY_DATA) {
+        continue;
+      }
+      break;
+    case http2::HD_SEC_WEBSOCKET_ACCEPT:
+      if (flags & http2::HDOP_STRIP_SEC_WEBSOCKET_ACCEPT) {
+        continue;
+      }
+      break;
+    case http2::HD_SEC_WEBSOCKET_KEY:
+      if (flags & http2::HDOP_STRIP_SEC_WEBSOCKET_KEY) {
+        continue;
+      }
+      break;
+    case http2::HD_FORWARDED:
+      if (flags & http2::HDOP_STRIP_FORWARDED) {
+        continue;
+      }
+
+      if (it_forwarded == std::end(headers)) {
+        it_forwarded = it;
+        continue;
+      }
+
+      kv = &(*it_forwarded);
+      it_forwarded = it;
+      break;
+    case http2::HD_X_FORWARDED_FOR:
+      if (flags & http2::HDOP_STRIP_X_FORWARDED_FOR) {
+        continue;
+      }
+
+      if (it_xff == std::end(headers)) {
+        it_xff = it;
+        continue;
+      }
+
+      kv = &(*it_xff);
+      it_xff = it;
+      break;
+    case http2::HD_X_FORWARDED_PROTO:
+      if (flags & http2::HDOP_STRIP_X_FORWARDED_PROTO) {
+        continue;
+      }
+
+      if (it_xfp == std::end(headers)) {
+        it_xfp = it;
+        continue;
+      }
+
+      kv = &(*it_xfp);
+      it_xfp = it;
+      break;
+    case http2::HD_VIA:
+      if (flags & http2::HDOP_STRIP_VIA) {
+        continue;
+      }
+
+      if (it_via == std::end(headers)) {
+        it_via = it;
+        continue;
+      }
+
+      kv = &(*it_via);
+      it_via = it;
+      break;
+    }
+    nva.push_back(
+        make_nv_internal(kv->name, kv->value, kv->no_index, nv_flags));
+  }
+}
+} // namespace
+
+void copy_headers_to_nva(std::vector<nghttp3_nv> &nva,
+                         const HeaderRefs &headers, uint32_t flags) {
+  copy_headers_to_nva_internal(nva, headers, NGHTTP3_NV_FLAG_NONE, flags);
+}
+
+void copy_headers_to_nva_nocopy(std::vector<nghttp3_nv> &nva,
+                                const HeaderRefs &headers, uint32_t flags) {
+  copy_headers_to_nva_internal(
+      nva, headers,
+      NGHTTP3_NV_FLAG_NO_COPY_NAME | NGHTTP3_NV_FLAG_NO_COPY_VALUE, flags);
+}
+
+int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
+             size_t valuelen) {
+  if (!nghttp3_check_header_name(name, namelen)) {
+    return 0;
+  }
+  if (!nghttp3_check_header_value(value, valuelen)) {
+    return 0;
+  }
+  return 1;
+}
+
+void dump_nv(FILE *out, const nghttp3_nv *nva, size_t nvlen) {
+  auto end = nva + nvlen;
+  for (; nva != end; ++nva) {
+    fprintf(out, "%s: %s\n", nva->name, nva->value);
+  }
+  fputc('\n', out);
+  fflush(out);
+}
+
+} // namespace http3
+
+} // namespace nghttp2

src/http3.h

@@ -0,0 +1,129 @@
+/*
+ * 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 HTTP3_H
+#define HTTP3_H
+
+#include "nghttp2_config.h"
+
+#include <cstring>
+#include <string>
+#include <vector>
+
+#include <nghttp3/nghttp3.h>
+
+#include "http2.h"
+#include "template.h"
+
+namespace nghttp2 {
+
+namespace http3 {
+
+// Creates nghttp3_nv using |name| and |value| and returns it. The
+// returned value only references the data pointer to name.c_str() and
+// value.c_str().  If |no_index| is true, nghttp3_nv flags member has
+// NGHTTP3_NV_FLAG_NEVER_INDEX flag set.
+nghttp3_nv make_nv(const std::string &name, const std::string &value,
+                   bool never_index = false);
+
+nghttp3_nv make_nv(const StringRef &name, const StringRef &value,
+                   bool never_index = false);
+
+nghttp3_nv make_nv_nocopy(const std::string &name, const std::string &value,
+                          bool never_index = false);
+
+nghttp3_nv make_nv_nocopy(const StringRef &name, const StringRef &value,
+                          bool never_index = false);
+
+// Create nghttp3_nv from string literal |name| and |value|.
+template <size_t N, size_t M>
+constexpr nghttp3_nv make_nv_ll(const char (&name)[N], const char (&value)[M]) {
+  return {(uint8_t *)name, (uint8_t *)value, N - 1, M - 1,
+          NGHTTP3_NV_FLAG_NO_COPY_NAME | NGHTTP3_NV_FLAG_NO_COPY_VALUE};
+}
+
+// Create nghttp3_nv from string literal |name| and c-string |value|.
+template <size_t N>
+nghttp3_nv make_nv_lc(const char (&name)[N], const char *value) {
+  return {(uint8_t *)name, (uint8_t *)value, N - 1, strlen(value),
+          NGHTTP3_NV_FLAG_NO_COPY_NAME};
+}
+
+template <size_t N>
+nghttp3_nv make_nv_lc_nocopy(const char (&name)[N], const char *value) {
+  return {(uint8_t *)name, (uint8_t *)value, N - 1, strlen(value),
+          NGHTTP3_NV_FLAG_NO_COPY_NAME | NGHTTP3_NV_FLAG_NO_COPY_VALUE};
+}
+
+// Create nghttp3_nv from string literal |name| and std::string
+// |value|.
+template <size_t N>
+nghttp3_nv make_nv_ls(const char (&name)[N], const std::string &value) {
+  return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
+          NGHTTP3_NV_FLAG_NO_COPY_NAME};
+}
+
+template <size_t N>
+nghttp3_nv make_nv_ls_nocopy(const char (&name)[N], const std::string &value) {
+  return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
+          NGHTTP3_NV_FLAG_NO_COPY_NAME | NGHTTP3_NV_FLAG_NO_COPY_VALUE};
+}
+
+template <size_t N>
+nghttp3_nv make_nv_ls_nocopy(const char (&name)[N], const StringRef &value) {
+  return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
+          NGHTTP3_NV_FLAG_NO_COPY_NAME | NGHTTP3_NV_FLAG_NO_COPY_VALUE};
+}
+
+// Appends headers in |headers| to |nv|.  |headers| must be indexed
+// before this call (its element's token field is assigned).  Certain
+// headers, including disallowed headers in HTTP/3 spec and headers
+// which require special handling (i.e. via), are not copied.  |flags|
+// is one or more of HeaderBuildOp flags.  They tell function that
+// certain header fields should not be added.
+void copy_headers_to_nva(std::vector<nghttp3_nv> &nva,
+                         const HeaderRefs &headers, uint32_t flags);
+
+// Just like copy_headers_to_nva(), but this adds
+// NGHTTP3_NV_FLAG_NO_COPY_NAME and NGHTTP3_NV_FLAG_NO_COPY_VALUE.
+void copy_headers_to_nva_nocopy(std::vector<nghttp3_nv> &nva,
+                                const HeaderRefs &headers, uint32_t flags);
+
+// Dumps name/value pairs in |nva| to |out|.
+void dump_nv(FILE *out, const nghttp3_nv *nva, size_t nvlen);
+
+// Checks the header name/value pair using nghttp3_check_header_name()
+// and nghttp3_check_header_value(). If both function returns nonzero,
+// this function returns nonzero.
+int check_nv(const uint8_t *name, size_t namelen, const uint8_t *value,
+             size_t valuelen);
+
+// Dumps name/value pairs in |nva| to |out|.
+void dump_nv(FILE *out, const nghttp3_nv *nva, size_t nvlen);
+
+} // namespace http3
+
+} // namespace nghttp2
+
+#endif // HTTP3_H

src/memchunk.h

@@ -113,13 +113,22 @@ template <typename T> struct Pool {
 
 template <typename Memchunk> struct Memchunks {
   Memchunks(Pool<Memchunk> *pool)
-      : pool(pool), head(nullptr), tail(nullptr), len(0) {}
+      : pool(pool),
+        head(nullptr),
+        tail(nullptr),
+        len(0),
+        mark(nullptr),
+        mark_pos(nullptr),
+        mark_offset(0) {}
   Memchunks(const Memchunks &) = delete;
   Memchunks(Memchunks &&other) noexcept
       : pool{other.pool}, // keep other.pool
         head{std::exchange(other.head, nullptr)},
         tail{std::exchange(other.tail, nullptr)},
-        len{std::exchange(other.len, 0)} {}
+        len{std::exchange(other.len, 0)},
+        mark{std::exchange(other.mark, nullptr)},
+        mark_pos{std::exchange(other.mark_pos, nullptr)},
+        mark_offset{std::exchange(other.mark_offset, 0)} {}
   Memchunks &operator=(const Memchunks &) = delete;
   Memchunks &operator=(Memchunks &&other) noexcept {
     if (this == &other) {
@@ -132,6 +141,9 @@ template <typename Memchunk> struct Memchunks {
     head = std::exchange(other.head, nullptr);
     tail = std::exchange(other.tail, nullptr);
     len = std::exchange(other.len, 0);
+    mark = std::exchange(other.mark, nullptr);
+    mark_pos = std::exchange(other.mark_pos, nullptr);
+    mark_offset = std::exchange(other.mark_offset, 0);
 
     return *this;
   }
@@ -200,6 +212,8 @@ template <typename Memchunk> struct Memchunks {
     return len;
   }
   size_t remove(void *dest, size_t count) {
+    assert(mark == nullptr);
+
     if (!tail || count == 0) {
       return 0;
     }
@@ -231,6 +245,8 @@ template <typename Memchunk> struct Memchunks {
     return first - static_cast<uint8_t *>(dest);
   }
   size_t remove(Memchunks &dest, size_t count) {
+    assert(mark == nullptr);
+
     if (!tail || count == 0) {
       return 0;
     }
@@ -262,6 +278,7 @@ template <typename Memchunk> struct Memchunks {
   }
   size_t remove(Memchunks &dest) {
     assert(pool == dest.pool);
+    assert(mark == nullptr);
 
     if (head == nullptr) {
       return 0;
@@ -284,6 +301,8 @@ template <typename Memchunk> struct Memchunks {
     return n;
   }
   size_t drain(size_t count) {
+    assert(mark == nullptr);
+
     auto ndata = count;
     auto m = head;
     while (m) {
@@ -305,6 +324,38 @@ template <typename Memchunk> struct Memchunks {
     }
     return ndata - count;
   }
+  size_t drain_mark(size_t count) {
+    auto ndata = count;
+    auto m = head;
+    while (m) {
+      auto next = m->next;
+      auto n = std::min(count, m->len());
+      m->pos += n;
+      count -= n;
+      len -= n;
+      mark_offset -= n;
+
+      if (m->len() > 0) {
+        assert(mark != m || m->pos <= mark_pos);
+        break;
+      }
+      if (mark == m) {
+        assert(m->pos <= mark_pos);
+
+        mark = nullptr;
+        mark_pos = nullptr;
+        mark_offset = 0;
+      }
+
+      pool->recycle(m);
+      m = next;
+    }
+    head = m;
+    if (head == nullptr) {
+      tail = nullptr;
+    }
+    return ndata - count;
+  }
   int riovec(struct iovec *iov, int iovcnt) const {
     if (!head) {
       return 0;
@@ -317,7 +368,41 @@ template <typename Memchunk> struct Memchunks {
     }
     return i;
   }
+  int riovec_mark(struct iovec *iov, int iovcnt) {
+    if (!head || iovcnt == 0) {
+      return 0;
+    }
+
+    int i = 0;
+    Memchunk *m;
+    if (mark) {
+      if (mark_pos != mark->last) {
+        iov[0].iov_base = mark_pos;
+        iov[0].iov_len = mark->len() - (mark_pos - mark->pos);
+
+        mark_pos = mark->last;
+        mark_offset += iov[0].iov_len;
+        i = 1;
+      }
+      m = mark->next;
+    } else {
+      i = 0;
+      m = head;
+    }
+
+    for (; i < iovcnt && m; ++i, m = m->next) {
+      iov[i].iov_base = m->pos;
+      iov[i].iov_len = m->len();
+
+      mark = m;
+      mark_pos = m->last;
+      mark_offset += m->len();
+    }
+
+    return i;
+  }
   size_t rleft() const { return len; }
+  size_t rleft_mark() const { return len - mark_offset; }
   void reset() {
     for (auto m = head; m;) {
       auto next = m->next;
@@ -325,12 +410,17 @@ template <typename Memchunk> struct Memchunks {
       m = next;
     }
     len = 0;
-    head = tail = nullptr;
+    head = tail = mark = nullptr;
+    mark_pos = nullptr;
+    mark_offset = 0;
   }
 
   Pool<Memchunk> *pool;
   Memchunk *head, *tail;
   size_t len;
+  Memchunk *mark;
+  uint8_t *mark_pos;
+  size_t mark_offset;
 };
 
 // Wrapper around Memchunks to offer "peeking" functionality.

src/quic.cc

@@ -0,0 +1,60 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * 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.
+ */
+#include "quic.h"
+
+#include <cassert>
+
+#include <ngtcp2/ngtcp2.h>
+#include <nghttp3/nghttp3.h>
+
+#include "template.h"
+
+using namespace nghttp2;
+
+namespace quic {
+
+Error err_transport(int liberr) {
+  if (liberr == NGTCP2_ERR_RECV_VERSION_NEGOTIATION) {
+    return {ErrorType::TransportVersionNegotiation, 0};
+  }
+  return {ErrorType::Transport,
+          ngtcp2_err_infer_quic_transport_error_code(liberr)};
+}
+
+Error err_transport_idle_timeout() {
+  return {ErrorType::TransportIdleTimeout, 0};
+}
+
+Error err_transport_tls(int alert) {
+  return {ErrorType::Transport, ngtcp2_err_infer_quic_transport_error_code(
+                                    NGTCP2_CRYPTO_ERROR | alert)};
+}
+
+Error err_application(int liberr) {
+  return {ErrorType::Application,
+          nghttp3_err_infer_quic_app_error_code(liberr)};
+}
+
+} // namespace quic

src/quic.h

@@ -0,0 +1,56 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * 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 QUIC_H
+#define QUIC_H
+
+#include "nghttp2_config.h"
+
+#include "stdint.h"
+
+namespace quic {
+
+enum class ErrorType {
+  Transport,
+  TransportVersionNegotiation,
+  TransportIdleTimeout,
+  Application,
+};
+
+struct Error {
+  Error(ErrorType type, uint64_t code) : type(type), code(code) {}
+  Error() : type(ErrorType::Transport), code(0) {}
+
+  ErrorType type;
+  uint64_t code;
+};
+
+Error err_transport(int liberr);
+Error err_transport_idle_timeout();
+Error err_transport_tls(int alert);
+Error err_application(int liberr);
+
+} // namespace quic
+
+#endif // QUIC_H

src/shrpx.cc

@@ -71,6 +71,7 @@
 
 #include <openssl/ssl.h>
 #include <openssl/err.h>
+#include <openssl/rand.h>
 #include <ev.h>
 
 #include <nghttp2/nghttp2.h>
@@ -1548,6 +1549,21 @@ void fill_default_config(Config *config) {
         downstreamconf.option, downstreamconf.encoder_dynamic_table_size);
   }
 
+#ifdef ENABLE_HTTP3
+  auto &quicconf = config->quic;
+  {
+    quicconf.timeout.idle = 30_s;
+
+    auto &stateless_resetconf = quicconf.stateless_reset;
+    // TODO Find better place to do this and error handling.
+    if (RAND_bytes(stateless_resetconf.secret.data(),
+                   stateless_resetconf.secret.size()) != 1) {
+      LOG(FATAL) << "Unable to generate stateless reset secret";
+      exit(EXIT_FAILURE);
+    }
+  }
+#endif // ENABLE_HTTP3
+
   auto &loggingconf = config->logging;
   {
     auto &accessconf = loggingconf.access;

src/shrpx_client_handler.cc

@@ -51,6 +51,9 @@
 #include "shrpx_api_downstream_connection.h"
 #include "shrpx_health_monitor_downstream_connection.h"
 #include "shrpx_null_downstream_connection.h"
+#ifdef ENABLE_HTTP3
+#  include "shrpx_http3_upstream.h"
+#endif // ENABLE_HTTP3
 #include "shrpx_log.h"
 #include "util.h"
 #include "template.h"
@@ -286,6 +289,19 @@ int ClientHandler::write_tls() {
   }
 }
 
+#ifdef ENABLE_HTTP3
+int ClientHandler::read_quic(const UpstreamAddr *faddr,
+                             const Address &remote_addr,
+                             const Address &local_addr, const uint8_t *data,
+                             size_t datalen) {
+  auto upstream = static_cast<Http3Upstream *>(upstream_.get());
+
+  return upstream->on_read(faddr, remote_addr, local_addr, data, datalen);
+}
+
+int ClientHandler::write_quic() { return upstream_->on_write(); }
+#endif // ENABLE_HTTP3
+
 int ClientHandler::upstream_noop() { return 0; }
 
 int ClientHandler::upstream_read() {
@@ -402,7 +418,8 @@ ClientHandler::ClientHandler(Worker *worker, int fd, SSL *ssl,
             get_config()->conn.upstream.ratelimit.write,
             get_config()->conn.upstream.ratelimit.read, writecb, readcb,
             timeoutcb, this, get_config()->tls.dyn_rec.warmup_threshold,
-            get_config()->tls.dyn_rec.idle_timeout, Proto::NONE),
+            get_config()->tls.dyn_rec.idle_timeout,
+            faddr->quic ? Proto::HTTP3 : Proto::NONE),
       ipaddr_(make_string_ref(balloc_, ipaddr)),
       port_(make_string_ref(balloc_, port)),
       faddr_(faddr),
@@ -418,11 +435,14 @@ ClientHandler::ClientHandler(Worker *worker, int fd, SSL *ssl,
 
   reneg_shutdown_timer_.data = this;
 
+  if (!faddr->quic) {
     conn_.rlimit.startw();
+  }
   ev_timer_again(conn_.loop, &conn_.rt);
 
   auto config = get_config();
 
+  if (!faddr->quic) {
     if (faddr_->accept_proxy_protocol ||
         config->conn.upstream.accept_proxy_protocol) {
       read_ = &ClientHandler::read_clear;
@@ -432,6 +452,7 @@ ClientHandler::ClientHandler(Worker *worker, int fd, SSL *ssl,
     } else {
       setup_upstream_io_callback();
     }
+  }
 
   auto &fwdconf = config->http.forwarded;
 
@@ -492,6 +513,15 @@ void ClientHandler::setup_upstream_io_callback() {
   }
 }
 
+#ifdef ENABLE_HTTP3
+void ClientHandler::setup_http3_upstream(
+    std::unique_ptr<Http3Upstream> &&upstream) {
+  upstream_ = std::move(upstream);
+  alpn_ = StringRef::from_lit("h3");
+  write_ = &ClientHandler::write_quic;
+}
+#endif // ENABLE_HTTP3
+
 ClientHandler::~ClientHandler() {
   if (LOG_ENABLED(INFO)) {
     CLOG(INFO, this) << "Deleting";

src/shrpx_client_handler.h

@@ -53,6 +53,9 @@ class Downstream;
 struct WorkerStat;
 struct DownstreamAddrGroup;
 struct DownstreamAddr;
+#ifdef ENABLE_HTTP3
+class Http3Upstream;
+#endif // ENABLE_HTTP3
 
 class ClientHandler {
 public:
@@ -143,6 +146,13 @@ public:
 
   void setup_upstream_io_callback();
 
+#ifdef ENABLE_HTTP3
+  void setup_http3_upstream(std::unique_ptr<Http3Upstream> &&upstream);
+  int read_quic(const UpstreamAddr *faddr, const Address &remote_addr,
+                const Address &local_addr, const uint8_t *data, size_t datalen);
+  int write_quic();
+#endif // ENABLE_HTTP3
+
   // Returns string suitable for use in "by" parameter of Forwarded
   // header field.
   StringRef get_forwarded_by() const;

src/shrpx_config.cc

@@ -785,6 +785,7 @@ struct UpstreamParams {
   bool tls;
   bool sni_fwd;
   bool proxyproto;
+  bool quic;
 };
 
 namespace {
@@ -819,6 +820,12 @@ int parse_upstream_params(UpstreamParams &out, const StringRef &src_params) {
       out.alt_mode = UpstreamAltMode::HEALTHMON;
     } else if (util::strieq_l("proxyproto", param)) {
       out.proxyproto = true;
+    } else if (util::strieq_l("quic", param)) {
+#ifdef ENABLE_HTTP3
+      out.quic = true;
+#else  // !ENABLE_HTTP3
+      LOG(ERROR) << "quic: QUIC is disabled at compile time";
+#endif // !ENABLE_HTTP3
     } else if (!param.empty()) {
       LOG(ERROR) << "frontend: " << param << ": unknown keyword";
       return -1;
@@ -2637,7 +2644,6 @@ int parse_config(Config *config, int optid, const StringRef &opt,
     return 0;
   }
   case SHRPX_OPTID_FRONTEND: {
-    auto &listenerconf = config->conn.listener;
     auto &apiconf = config->api;
 
     auto addr_end = std::find(std::begin(optarg), std::end(optarg), ';');
@@ -2655,23 +2661,36 @@ int parse_config(Config *config, int optid, const StringRef &opt,
       return -1;
     }
 
+    if (params.quic && params.alt_mode != UpstreamAltMode::NONE) {
+      LOG(ERROR) << "frontend: api or healthmon cannot be used with quic";
+      return -1;
+    }
+
     UpstreamAddr addr{};
     addr.fd = -1;
     addr.tls = params.tls;
     addr.sni_fwd = params.sni_fwd;
     addr.alt_mode = params.alt_mode;
     addr.accept_proxy_protocol = params.proxyproto;
+    addr.quic = params.quic;
 
     if (addr.alt_mode == UpstreamAltMode::API) {
       apiconf.enabled = true;
     }
 
+#ifdef ENABLE_HTTP3
+    auto &addrs = params.quic ? config->conn.quic_listener.addrs
+                              : config->conn.listener.addrs;
+#else  // !ENABLE_HTTP3
+    auto &addrs = config->conn.listener.addrs;
+#endif // !ENABLE_HTTP3
+
     if (util::istarts_with(optarg, SHRPX_UNIX_PATH_PREFIX)) {
       auto path = std::begin(optarg) + SHRPX_UNIX_PATH_PREFIX.size();
       addr.host = make_string_ref(config->balloc, StringRef{path, addr_end});
       addr.host_unix = true;
 
-      listenerconf.addrs.push_back(std::move(addr));
+      addrs.push_back(std::move(addr));
 
       return 0;
     }
@@ -2686,21 +2705,21 @@ int parse_config(Config *config, int optid, const StringRef &opt,
 
     if (util::numeric_host(host, AF_INET)) {
       addr.family = AF_INET;
-      listenerconf.addrs.push_back(std::move(addr));
+      addrs.push_back(std::move(addr));
       return 0;
     }
 
     if (util::numeric_host(host, AF_INET6)) {
       addr.family = AF_INET6;
-      listenerconf.addrs.push_back(std::move(addr));
+      addrs.push_back(std::move(addr));
       return 0;
     }
 
     addr.family = AF_INET;
-    listenerconf.addrs.push_back(addr);
+    addrs.push_back(addr);
 
     addr.family = AF_INET6;
-    listenerconf.addrs.push_back(std::move(addr));
+    addrs.push_back(std::move(addr));
 
     return 0;
   }
@@ -3980,6 +3999,8 @@ StringRef strproto(Proto proto) {
     return StringRef::from_lit("http/1.1");
   case Proto::HTTP2:
     return StringRef::from_lit("h2");
+  case Proto::HTTP3:
+    return StringRef::from_lit("h3");
   case Proto::MEMCACHED:
     return StringRef::from_lit("memcached");
   }

src/shrpx_config.h

@@ -370,6 +370,7 @@ enum class Proto {
   NONE,
   HTTP1,
   HTTP2,
+  HTTP3,
   MEMCACHED,
 };
 
@@ -458,6 +459,7 @@ struct UpstreamAddr {
   bool sni_fwd;
   // true if client is supposed to send PROXY protocol v1 header.
   bool accept_proxy_protocol;
+  bool quic;
   int fd;
 };
 
@@ -702,6 +704,20 @@ struct TLSConfig {
   bool no_postpone_early_data;
 };
 
+#ifdef ENABLE_HTTP3
+struct QUICConfig {
+  struct {
+    std::array<uint8_t, 32> secret;
+  } stateless_reset;
+  struct {
+    ev_tstamp idle;
+  } timeout;
+  struct {
+    bool log;
+  } debug;
+};
+#endif // ENABLE_HTTP3
+
 // custom error page
 struct ErrorPage {
   // not NULL-terminated
@@ -907,6 +923,12 @@ struct ConnectionConfig {
     int fastopen;
   } listener;
 
+#ifdef ENABLE_HTTP3
+  struct {
+    std::vector<UpstreamAddr> addrs;
+  } quic_listener;
+#endif // ENABLE_HTTP3
+
   struct {
     struct {
       ev_tstamp http2_read;
@@ -950,6 +972,9 @@ struct Config {
         http{},
         http2{},
         tls{},
+#ifdef ENABLE_HTTP3
+        quic{},
+#endif // ENABLE_HTTP3
         logging{},
         conn{},
         api{},
@@ -967,7 +992,8 @@ struct Config {
         single_process{false},
         single_thread{false},
         ignore_per_pattern_mruby_error{false},
-        ev_loop_flags{0} {}
+        ev_loop_flags{0} {
+  }
   ~Config();
 
   Config(Config &&) = delete;
@@ -983,6 +1009,9 @@ struct Config {
   HttpConfig http;
   Http2Config http2;
   TLSConfig tls;
+#ifdef ENABLE_HTTP3
+  QUICConfig quic;
+#endif // ENABLE_HTTP3
   LoggingConfig logging;
   ConnectionConfig conn;
   APIConfig api;

src/shrpx_connection.cc

@@ -74,7 +74,7 @@ Connection::Connection(struct ev_loop *loop, int fd, SSL *ssl,
       read_timeout(read_timeout) {
 
   ev_io_init(&wev, writecb, fd, EV_WRITE);
-  ev_io_init(&rev, readcb, fd, EV_READ);
+  ev_io_init(&rev, readcb, proto == Proto::HTTP3 ? 0 : fd, EV_READ);
 
   wev.data = this;
   rev.data = this;
@@ -128,7 +128,7 @@ void Connection::disconnect() {
     tls.early_data_finish = false;
   }
 
-  if (fd != -1) {
+  if (proto != Proto::HTTP3 && fd != -1) {
     shutdown(fd, SHUT_WR);
     close(fd);
     fd = -1;
@@ -312,10 +312,13 @@ BIO_METHOD *create_bio_method() {
 void Connection::set_ssl(SSL *ssl) {
   tls.ssl = ssl;
 
+  if (proto != Proto::HTTP3) {
     auto &tlsconf = get_config()->tls;
     auto bio = BIO_new(tlsconf.bio_method);
     BIO_set_data(bio, this);
     SSL_set_bio(tls.ssl, bio, bio);
+  }
+
   SSL_set_app_data(tls.ssl, this);
 }
 

src/shrpx_connection_handler.cc

@@ -156,6 +156,19 @@ ConnectionHandler::~ConnectionHandler() {
   ev_timer_stop(loop_, &ocsp_timer_);
   ev_timer_stop(loop_, &disable_acceptor_timer_);
 
+#ifdef ENABLE_HTTP3
+  for (auto ssl_ctx : quic_all_ssl_ctx_) {
+    if (ssl_ctx == nullptr) {
+      continue;
+    }
+
+    auto tls_ctx_data =
+        static_cast<tls::TLSContextData *>(SSL_CTX_get_app_data(ssl_ctx));
+    delete tls_ctx_data;
+    SSL_CTX_free(ssl_ctx);
+  }
+#endif // ENABLE_HTTP3
+
   for (auto ssl_ctx : all_ssl_ctx_) {
     auto tls_ctx_data =
         static_cast<tls::TLSContextData *>(SSL_CTX_get_app_data(ssl_ctx));
@@ -209,6 +222,18 @@ int ConnectionHandler::create_single_worker() {
       nb_
 #endif // HAVE_NEVERBLEED
   );
+
+#ifdef ENABLE_HTTP3
+  quic_cert_tree_ = tls::create_cert_lookup_tree();
+  auto quic_sv_ssl_ctx = tls::setup_quic_server_ssl_context(
+      quic_all_ssl_ctx_, quic_indexed_ssl_ctx_, quic_cert_tree_.get()
+#  ifdef HAVE_NEVERBLEED
+                                                    ,
+      nb_
+#  endif // HAVE_NEVERBLEED
+  );
+#endif // ENABLE_HTTP3
+
   auto cl_ssl_ctx = tls::setup_downstream_client_ssl_context(
 #ifdef HAVE_NEVERBLEED
       nb_
@@ -217,6 +242,9 @@ int ConnectionHandler::create_single_worker() {
 
   if (cl_ssl_ctx) {
     all_ssl_ctx_.push_back(cl_ssl_ctx);
+#ifdef ENABLE_HTTP3
+    quic_all_ssl_ctx_.push_back(nullptr);
+#endif // ENABLE_HTTP3
   }
 
   auto config = get_config();
@@ -233,11 +261,17 @@ int ConnectionHandler::create_single_worker() {
           tlsconf.cacert, memcachedconf.cert_file,
           memcachedconf.private_key_file, nullptr);
       all_ssl_ctx_.push_back(session_cache_ssl_ctx);
+#ifdef ENABLE_HTTP3
+      quic_all_ssl_ctx_.push_back(nullptr);
+#endif // ENABLE_HTTP3
     }
   }
 
   single_worker_ = std::make_unique<Worker>(
       loop_, sv_ssl_ctx, cl_ssl_ctx, session_cache_ssl_ctx, cert_tree_.get(),
+#ifdef ENABLE_HTTP3
+      quic_sv_ssl_ctx, quic_cert_tree_.get(),
+#endif // ENABLE_HTTP3
       ticket_keys_, this, config->conn.downstream);
 #ifdef HAVE_MRUBY
   if (single_worker_->create_mruby_context() != 0) {
@@ -245,6 +279,12 @@ int ConnectionHandler::create_single_worker() {
   }
 #endif // HAVE_MRUBY
 
+#ifdef ENABLE_HTTP3
+  if (single_worker_->setup_quic_server_socket() != 0) {
+    return -1;
+  }
+#endif // ENABLE_HTTP3
+
   return 0;
 }
 
@@ -260,6 +300,18 @@ int ConnectionHandler::create_worker_thread(size_t num) {
       nb_
 #  endif // HAVE_NEVERBLEED
   );
+
+#  ifdef ENABLE_HTTP3
+  quic_cert_tree_ = tls::create_cert_lookup_tree();
+  auto quic_sv_ssl_ctx = tls::setup_quic_server_ssl_context(
+      quic_all_ssl_ctx_, quic_indexed_ssl_ctx_, quic_cert_tree_.get()
+#    ifdef HAVE_NEVERBLEED
+                                                    ,
+      nb_
+#    endif // HAVE_NEVERBLEED
+  );
+#  endif // ENABLE_HTTP3
+
   auto cl_ssl_ctx = tls::setup_downstream_client_ssl_context(
 #  ifdef HAVE_NEVERBLEED
       nb_
@@ -268,6 +320,9 @@ int ConnectionHandler::create_worker_thread(size_t num) {
 
   if (cl_ssl_ctx) {
     all_ssl_ctx_.push_back(cl_ssl_ctx);
+#  ifdef ENABLE_HTTP3
+    quic_all_ssl_ctx_.push_back(nullptr);
+#  endif // ENABLE_HTTP3
   }
 
   auto config = get_config();
@@ -291,6 +346,9 @@ int ConnectionHandler::create_worker_thread(size_t num) {
           tlsconf.cacert, memcachedconf.cert_file,
           memcachedconf.private_key_file, nullptr);
       all_ssl_ctx_.push_back(session_cache_ssl_ctx);
+#  ifdef ENABLE_HTTP3
+      quic_all_ssl_ctx_.push_back(nullptr);
+#  endif // ENABLE_HTTP3
     }
   }
 
@@ -299,6 +357,9 @@ int ConnectionHandler::create_worker_thread(size_t num) {
 
     auto worker = std::make_unique<Worker>(
         loop, sv_ssl_ctx, cl_ssl_ctx, session_cache_ssl_ctx, cert_tree_.get(),
+#  ifdef ENABLE_HTTP3
+        quic_sv_ssl_ctx, quic_cert_tree_.get(),
+#  endif // ENABLE_HTTP3
         ticket_keys_, this, config->conn.downstream);
 #  ifdef HAVE_MRUBY
     if (worker->create_mruby_context() != 0) {
@@ -306,6 +367,13 @@ int ConnectionHandler::create_worker_thread(size_t num) {
     }
 #  endif // HAVE_MRUBY
 
+#  ifdef ENABLE_HTTP3
+    if ((!apiconf.enabled || i != 0) &&
+        worker->setup_quic_server_socket() != 0) {
+      return -1;
+    }
+#  endif // ENABLE_HTTP3
+
     workers_.push_back(std::move(worker));
     worker_loops_.push_back(loop);
 
@@ -602,6 +670,9 @@ void ConnectionHandler::handle_ocsp_complete() {
   ev_child_stop(loop_, &ocsp_.chldev);
 
   assert(ocsp_.next < all_ssl_ctx_.size());
+#ifdef ENABLE_HTTP3
+  assert(all_ssl_ctx_.size() == quic_all_ssl_ctx_.size());
+#endif // ENABLE_HTTP3
 
   auto ssl_ctx = all_ssl_ctx_[ocsp_.next];
   auto tls_ctx_data =
@@ -629,6 +700,31 @@ void ConnectionHandler::handle_ocsp_complete() {
   if (tlsconf.ocsp.no_verify ||
       tls::verify_ocsp_response(ssl_ctx, ocsp_.resp.data(),
                                 ocsp_.resp.size()) == 0) {
+#ifdef ENABLE_HTTP3
+    // We have list of SSL_CTX with the same certificate in
+    // quic_all_ssl_ctx_ as well.  Some SSL_CTXs are missing there in
+    // that case we get nullptr.
+    auto quic_ssl_ctx = quic_all_ssl_ctx_[ocsp_.next];
+    if (quic_ssl_ctx) {
+      auto quic_tls_ctx_data = static_cast<tls::TLSContextData *>(
+          SSL_CTX_get_app_data(quic_ssl_ctx));
+#  ifndef OPENSSL_IS_BORINGSSL
+#    ifdef HAVE_ATOMIC_STD_SHARED_PTR
+      std::atomic_store_explicit(
+          &quic_tls_ctx_data->ocsp_data,
+          std::make_shared<std::vector<uint8_t>>(ocsp_.resp),
+          std::memory_order_release);
+#    else  // !HAVE_ATOMIC_STD_SHARED_PTR
+      std::lock_guard<std::mutex> g(quic_tls_ctx_data->mu);
+      quic_tls_ctx_data->ocsp_data =
+          std::make_shared<std::vector<uint8_t>>(ocsp_.resp);
+#    endif // !HAVE_ATOMIC_STD_SHARED_PTR
+#  else    // OPENSSL_IS_BORINGSSL
+      SSL_CTX_set_ocsp_response(ssl_ctx, ocsp_.resp.data(), ocsp_.resp.size());
+#  endif   // OPENSSL_IS_BORINGSSL
+    }
+#endif // ENABLE_HTTP3
+
 #ifndef OPENSSL_IS_BORINGSSL
 #  ifdef HAVE_ATOMIC_STD_SHARED_PTR
     std::atomic_store_explicit(
@@ -809,6 +905,9 @@ SSL_CTX *ConnectionHandler::create_tls_ticket_key_memcached_ssl_ctx() {
       nullptr);
 
   all_ssl_ctx_.push_back(ssl_ctx);
+#ifdef ENABLE_HTTP3
+  quic_all_ssl_ctx_.push_back(nullptr);
+#endif // ENABLE_HTTP3
 
   return ssl_ctx;
 }
@@ -871,6 +970,13 @@ ConnectionHandler::get_indexed_ssl_ctx(size_t idx) const {
   return indexed_ssl_ctx_[idx];
 }
 
+#ifdef ENABLE_HTTP3
+const std::vector<SSL_CTX *> &
+ConnectionHandler::get_quic_indexed_ssl_ctx(size_t idx) const {
+  return quic_indexed_ssl_ctx_[idx];
+}
+#endif // ENABLE_HTTP3
+
 void ConnectionHandler::set_enable_acceptor_on_ocsp_completion(bool f) {
   enable_acceptor_on_ocsp_completion_ = f;
 }

src/shrpx_connection_handler.h

@@ -159,6 +159,9 @@ public:
   SSL_CTX *get_ssl_ctx(size_t idx) const;
 
   const std::vector<SSL_CTX *> &get_indexed_ssl_ctx(size_t idx) const;
+#ifdef ENABLE_HTTP3
+  const std::vector<SSL_CTX *> &get_quic_indexed_ssl_ctx(size_t idx) const;
+#endif // ENABLE_HTTP3
 
 #ifdef HAVE_NEVERBLEED
   void set_neverbleed(neverbleed_t *nb);
@@ -187,6 +190,10 @@ private:
   // selection among them are performed by hostname presented by SNI,
   // and signature algorithm presented by client.
   std::vector<std::vector<SSL_CTX *>> indexed_ssl_ctx_;
+#ifdef ENABLE_HTTP3
+  std::vector<SSL_CTX *> quic_all_ssl_ctx_;
+  std::vector<std::vector<SSL_CTX *>> quic_indexed_ssl_ctx_;
+#endif // ENABLE_HTTP3
   OCSPUpdateContext ocsp_;
   std::mt19937 &gen_;
   // ev_loop for each worker
@@ -203,6 +210,9 @@ private:
   // Otherwise, nullptr and workers_ has instances of Worker instead.
   std::unique_ptr<Worker> single_worker_;
   std::unique_ptr<tls::CertLookupTree> cert_tree_;
+#ifdef ENABLE_HTTP3
+  std::unique_ptr<tls::CertLookupTree> quic_cert_tree_;
+#endif // ENABLE_HTTP3
   std::unique_ptr<MemcachedDispatcher> tls_ticket_key_memcached_dispatcher_;
   // Current TLS session ticket keys.  Note that TLS connection does
   // not refer to this field directly.  They use TicketKeys object in

src/shrpx_downstream.cc

@@ -113,7 +113,7 @@ void downstream_wtimeoutcb(struct ev_loop *loop, ev_timer *w, int revents) {
 
 // upstream could be nullptr for unittests
 Downstream::Downstream(Upstream *upstream, MemchunkPool *mcpool,
-                       int32_t stream_id)
+                       int64_t stream_id)
     : dlnext(nullptr),
       dlprev(nullptr),
       response_sent_body_length(0),
@@ -145,7 +145,8 @@ Downstream::Downstream(Upstream *upstream, MemchunkPool *mcpool,
       accesslog_written_(false),
       new_affinity_cookie_(false),
       blocked_request_data_eof_(false),
-      expect_100_continue_(false) {
+      expect_100_continue_(false),
+      stop_reading_(false) {
 
   auto &timeoutconf = get_config()->http2.timeout;
 
@@ -164,6 +165,9 @@ Downstream::Downstream(Upstream *upstream, MemchunkPool *mcpool,
   downstream_wtimer_.data = this;
 
   rcbufs_.reserve(32);
+#ifdef ENABLE_HTTP3
+  rcbufs3_.reserve(32);
+#endif // ENABLE_HTTP3
 }
 
 Downstream::~Downstream() {
@@ -203,6 +207,12 @@ Downstream::~Downstream() {
   // explicitly.
   dconn_.reset();
 
+#ifdef ENABLE_HTTP3
+  for (auto rcbuf : rcbufs3_) {
+    nghttp3_rcbuf_decref(rcbuf);
+  }
+#endif // ENABLE_HTTP3
+
   for (auto rcbuf : rcbufs_) {
     nghttp2_rcbuf_decref(rcbuf);
   }
@@ -605,9 +615,9 @@ void Downstream::reset_upstream(Upstream *upstream) {
 
 Upstream *Downstream::get_upstream() const { return upstream_; }
 
-void Downstream::set_stream_id(int32_t stream_id) { stream_id_ = stream_id; }
+void Downstream::set_stream_id(int64_t stream_id) { stream_id_ = stream_id; }
 
-int32_t Downstream::get_stream_id() const { return stream_id_; }
+int64_t Downstream::get_stream_id() const { return stream_id_; }
 
 void Downstream::set_request_state(DownstreamState state) {
   request_state_ = state;
@@ -904,11 +914,11 @@ StringRef Downstream::get_http2_settings() const {
   return http2_settings->value;
 }
 
-void Downstream::set_downstream_stream_id(int32_t stream_id) {
+void Downstream::set_downstream_stream_id(int64_t stream_id) {
   downstream_stream_id_ = stream_id;
 }
 
-int32_t Downstream::get_downstream_stream_id() const {
+int64_t Downstream::get_downstream_stream_id() const {
   return downstream_stream_id_;
 }
 
@@ -1115,11 +1125,11 @@ DefaultMemchunks Downstream::pop_response_buf() {
   return std::move(response_buf_);
 }
 
-void Downstream::set_assoc_stream_id(int32_t stream_id) {
+void Downstream::set_assoc_stream_id(int64_t stream_id) {
   assoc_stream_id_ = stream_id;
 }
 
-int32_t Downstream::get_assoc_stream_id() const { return assoc_stream_id_; }
+int64_t Downstream::get_assoc_stream_id() const { return assoc_stream_id_; }
 
 BlockAllocator &Downstream::get_block_allocator() { return balloc_; }
 
@@ -1128,6 +1138,13 @@ void Downstream::add_rcbuf(nghttp2_rcbuf *rcbuf) {
   rcbufs_.push_back(rcbuf);
 }
 
+#ifdef ENABLE_HTTP3
+void Downstream::add_rcbuf(nghttp3_rcbuf *rcbuf) {
+  nghttp3_rcbuf_incref(rcbuf);
+  rcbufs3_.push_back(rcbuf);
+}
+#endif // ENABLE_HTTP3
+
 void Downstream::set_downstream_addr_group(
     const std::shared_ptr<DownstreamAddrGroup> &group) {
   group_ = group;
@@ -1169,4 +1186,8 @@ bool Downstream::get_expect_100_continue() const {
   return expect_100_continue_;
 }
 
+bool Downstream::get_stop_reading() const { return stop_reading_; }
+
+void Downstream::set_stop_reading(bool f) { stop_reading_ = f; }
+
 } // namespace shrpx

src/shrpx_downstream.h

@@ -38,6 +38,10 @@
 
 #include <nghttp2/nghttp2.h>
 
+#ifdef ENABLE_HTTP3
+#  include <nghttp3/nghttp3.h>
+#endif // ENABLE_HTTP3
+
 #include "llhttp.h"
 
 #include "shrpx_io_control.h"
@@ -319,20 +323,20 @@ enum class DispatchState {
 
 class Downstream {
 public:
-  Downstream(Upstream *upstream, MemchunkPool *mcpool, int32_t stream_id);
+  Downstream(Upstream *upstream, MemchunkPool *mcpool, int64_t stream_id);
   ~Downstream();
   void reset_upstream(Upstream *upstream);
   Upstream *get_upstream() const;
-  void set_stream_id(int32_t stream_id);
+  void set_stream_id(int64_t stream_id);
-  int32_t get_stream_id() const;
+  int64_t get_stream_id() const;
-  void set_assoc_stream_id(int32_t stream_id);
+  void set_assoc_stream_id(int64_t stream_id);
-  int32_t get_assoc_stream_id() const;
+  int64_t get_assoc_stream_id() const;
   void pause_read(IOCtrlReason reason);
   int resume_read(IOCtrlReason reason, size_t consumed);
   void force_resume_read();
   // Set stream ID for downstream HTTP2 connection.
-  void set_downstream_stream_id(int32_t stream_id);
+  void set_downstream_stream_id(int64_t stream_id);
-  int32_t get_downstream_stream_id() const;
+  int64_t get_downstream_stream_id() const;
 
   int attach_downstream_connection(std::unique_ptr<DownstreamConnection> dconn);
   void detach_downstream_connection();
@@ -488,6 +492,9 @@ public:
   BlockAllocator &get_block_allocator();
 
   void add_rcbuf(nghttp2_rcbuf *rcbuf);
+#ifdef ENABLE_HTTP3
+  void add_rcbuf(nghttp3_rcbuf *rcbuf);
+#endif // ENABLE_HTTP3
 
   void
   set_downstream_addr_group(const std::shared_ptr<DownstreamAddrGroup> &group);
@@ -513,6 +520,9 @@ public:
 
   bool get_expect_100_continue() const;
 
+  bool get_stop_reading() const;
+  void set_stop_reading(bool f);
+
   enum {
     EVENT_ERROR = 0x1,
     EVENT_TIMEOUT = 0x2,
@@ -527,6 +537,9 @@ private:
   BlockAllocator balloc_;
 
   std::vector<nghttp2_rcbuf *> rcbufs_;
+#ifdef ENABLE_HTTP3
+  std::vector<nghttp3_rcbuf *> rcbufs3_;
+#endif // ENABLE_HTTP3
 
   Request req_;
   Response resp_;
@@ -566,12 +579,12 @@ private:
   // How many times we tried in backend connection
   size_t num_retry_;
   // The stream ID in frontend connection
-  int32_t stream_id_;
+  int64_t stream_id_;
   // The associated stream ID in frontend connection if this is pushed
   // stream.
-  int32_t assoc_stream_id_;
+  int64_t assoc_stream_id_;
   // stream ID in backend connection
-  int32_t downstream_stream_id_;
+  int64_t downstream_stream_id_;
   // RST_STREAM error_code from downstream HTTP2 connection
   uint32_t response_rst_stream_error_code_;
   // An affinity cookie value.
@@ -606,6 +619,7 @@ private:
   bool blocked_request_data_eof_;
   // true if request contains "expect: 100-continue" header field.
   bool expect_100_continue_;
+  bool stop_reading_;
 };
 
 } // namespace shrpx

src/shrpx_http3_upstream.h

@@ -0,0 +1,160 @@
+/*
+ * 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);
+
+  int on_read(const UpstreamAddr *faddr, const Address &remote_addr,
+              const Address &local_addr, const uint8_t *data, size_t datalen);
+
+  int write_streams();
+
+  int on_rx_secret(ngtcp2_crypto_level level, const uint8_t *secret,
+                   size_t secretlen);
+  int on_tx_secret(ngtcp2_crypto_level level, const uint8_t *secret,
+                   size_t secretlen);
+
+  int add_crypto_data(ngtcp2_crypto_level level, const uint8_t *data,
+                      size_t datalen);
+
+  void set_tls_alert(uint8_t alert);
+
+  int handle_error();
+
+  int handle_expiry();
+  void reset_idle_timer();
+  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);
+  int http_end_request_headers(Downstream *downstream);
+  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 redirect_to_https(Downstream *downstream);
+  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, size_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_send_stop_sending(int64_t stream_id, uint64_t app_error_code);
+  int http_recv_data(Downstream *downstream, const uint8_t *data,
+                     size_t datalen);
+
+private:
+  ClientHandler *handler_;
+  ev_timer timer_;
+  ev_timer idle_timer_;
+  ngtcp2_cid initial_client_dcid_;
+  ngtcp2_conn *conn_;
+  quic::Error last_error_;
+  uint8_t tls_alert_;
+  nghttp3_conn *httpconn_;
+  DownstreamQueue downstream_queue_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_HTTP3_UPSTREAM_H

src/shrpx_quic.cc

@@ -0,0 +1,314 @@
+/*
+ * 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.
+ */
+#include "shrpx_quic.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <netinet/udp.h>
+
+#include <array>
+#include <chrono>
+
+#include <ngtcp2/ngtcp2_crypto.h>
+
+#include <nghttp3/nghttp3.h>
+
+#include <openssl/rand.h>
+
+#include "shrpx_config.h"
+#include "shrpx_log.h"
+#include "util.h"
+#include "xsi_strerror.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+ngtcp2_tstamp quic_timestamp() {
+  return std::chrono::duration_cast<std::chrono::nanoseconds>(
+             std::chrono::steady_clock::now().time_since_epoch())
+      .count();
+}
+
+int create_quic_server_socket(UpstreamAddr &faddr) {
+  std::array<char, STRERROR_BUFSIZE> errbuf;
+  int fd = -1;
+  int rv;
+
+  auto service = util::utos(faddr.port);
+  addrinfo hints{};
+  hints.ai_family = faddr.family;
+  hints.ai_socktype = SOCK_DGRAM;
+  hints.ai_flags = AI_PASSIVE;
+#ifdef AI_ADDRCONFIG
+  hints.ai_flags |= AI_ADDRCONFIG;
+#endif // AI_ADDRCONFIG
+
+  auto node =
+      faddr.host == StringRef::from_lit("*") ? nullptr : faddr.host.c_str();
+
+  addrinfo *res, *rp;
+  rv = getaddrinfo(node, service.c_str(), &hints, &res);
+#ifdef AI_ADDRCONFIG
+  if (rv != 0) {
+    // Retry without AI_ADDRCONFIG
+    hints.ai_flags &= ~AI_ADDRCONFIG;
+    rv = getaddrinfo(node, service.c_str(), &hints, &res);
+  }
+#endif // AI_ADDRCONFIG
+  if (rv != 0) {
+    LOG(FATAL) << "Unable to get IPv" << (faddr.family == AF_INET ? "4" : "6")
+               << " address for " << faddr.host << ", port " << faddr.port
+               << ": " << gai_strerror(rv);
+    return -1;
+  }
+
+  auto res_d = defer(freeaddrinfo, res);
+
+  std::array<char, NI_MAXHOST> host;
+
+  for (rp = res; rp; rp = rp->ai_next) {
+    rv = getnameinfo(rp->ai_addr, rp->ai_addrlen, host.data(), host.size(),
+                     nullptr, 0, NI_NUMERICHOST);
+    if (rv != 0) {
+      LOG(WARN) << "getnameinfo() failed: " << gai_strerror(rv);
+      continue;
+    }
+
+#ifdef SOCK_NONBLOCK
+    fd = socket(rp->ai_family, rp->ai_socktype | SOCK_NONBLOCK | SOCK_CLOEXEC,
+                rp->ai_protocol);
+    if (fd == -1) {
+      auto error = errno;
+      LOG(WARN) << "socket() syscall failed: "
+                << xsi_strerror(error, errbuf.data(), errbuf.size());
+      continue;
+    }
+#else  // !SOCK_NONBLOCK
+    fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
+    if (fd == -1) {
+      auto error = errno;
+      LOG(WARN) << "socket() syscall failed: "
+                << xsi_strerror(error, errbuf.data(), errbuf.size());
+      continue;
+    }
+    util::make_socket_nonblocking(fd);
+    util::make_socket_closeonexec(fd);
+#endif // !SOCK_NONBLOCK
+
+    int val = 1;
+    if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &val,
+                   static_cast<socklen_t>(sizeof(val))) == -1) {
+      auto error = errno;
+      LOG(WARN) << "Failed to set SO_REUSEADDR option to listener socket: "
+                << xsi_strerror(error, errbuf.data(), errbuf.size());
+      close(fd);
+      continue;
+    }
+
+    if (setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, &val,
+                   static_cast<socklen_t>(sizeof(val))) == -1) {
+      auto error = errno;
+      LOG(WARN) << "Failed to set SO_REUSEPORT option to listener socket: "
+                << xsi_strerror(error, errbuf.data(), errbuf.size());
+      close(fd);
+      continue;
+    }
+
+    if (faddr.family == AF_INET6) {
+#ifdef IPV6_V6ONLY
+      if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &val,
+                     static_cast<socklen_t>(sizeof(val))) == -1) {
+        auto error = errno;
+        LOG(WARN) << "Failed to set IPV6_V6ONLY option to listener socket: "
+                  << xsi_strerror(error, errbuf.data(), errbuf.size());
+        close(fd);
+        continue;
+      }
+#endif // IPV6_V6ONLY
+
+      if (setsockopt(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &val,
+                     static_cast<socklen_t>(sizeof(val))) == -1) {
+        auto error = errno;
+        LOG(WARN)
+            << "Failed to set IPV6_RECVPKTINFO option to listener socket: "
+            << xsi_strerror(error, errbuf.data(), errbuf.size());
+        close(fd);
+        continue;
+      }
+    } else {
+      if (setsockopt(fd, IPPROTO_IP, IP_PKTINFO, &val,
+                     static_cast<socklen_t>(sizeof(val))) == -1) {
+        auto error = errno;
+        LOG(WARN) << "Failed to set IP_PKTINFO option to listener socket: "
+                  << xsi_strerror(error, errbuf.data(), errbuf.size());
+        close(fd);
+        continue;
+      }
+    }
+
+    // TODO Enable ECN
+
+    if (bind(fd, rp->ai_addr, rp->ai_addrlen) == -1) {
+      auto error = errno;
+      LOG(WARN) << "bind() syscall failed: "
+                << xsi_strerror(error, errbuf.data(), errbuf.size());
+      close(fd);
+      continue;
+    }
+
+    break;
+  }
+
+  if (!rp) {
+    LOG(FATAL) << "Listening " << (faddr.family == AF_INET ? "IPv4" : "IPv6")
+               << " socket failed";
+
+    return -1;
+  }
+
+  faddr.fd = fd;
+  faddr.hostport = util::make_http_hostport(mod_config()->balloc,
+                                            StringRef{host.data()}, faddr.port);
+
+  LOG(NOTICE) << "Listening on " << faddr.hostport << ", quic";
+
+  return 0;
+}
+
+int quic_send_packet(const UpstreamAddr *faddr, const sockaddr *remote_sa,
+                     size_t remote_salen, const sockaddr *local_sa,
+                     size_t local_salen, const uint8_t *data, size_t datalen,
+                     size_t gso_size) {
+  iovec msg_iov = {const_cast<uint8_t *>(data), datalen};
+  msghdr msg{};
+  msg.msg_name = const_cast<sockaddr *>(remote_sa);
+  msg.msg_namelen = remote_salen;
+  msg.msg_iov = &msg_iov;
+  msg.msg_iovlen = 1;
+
+  uint8_t msg_ctrl[
+#ifdef UDP_SEGMENT
+      CMSG_SPACE(sizeof(uint16_t)) +
+#endif // UDP_SEGMENT
+      CMSG_SPACE(sizeof(in6_pktinfo))];
+
+  memset(msg_ctrl, 0, sizeof(msg_ctrl));
+
+  msg.msg_control = msg_ctrl;
+  msg.msg_controllen = sizeof(msg_ctrl);
+
+  size_t controllen = 0;
+
+  auto cm = CMSG_FIRSTHDR(&msg);
+
+  switch (local_sa->sa_family) {
+  case AF_INET: {
+    controllen += CMSG_SPACE(sizeof(in_pktinfo));
+    cm->cmsg_level = IPPROTO_IP;
+    cm->cmsg_type = IP_PKTINFO;
+    cm->cmsg_len = CMSG_LEN(sizeof(in_pktinfo));
+    auto pktinfo = reinterpret_cast<in_pktinfo *>(CMSG_DATA(cm));
+    memset(pktinfo, 0, sizeof(in_pktinfo));
+    auto addrin =
+        reinterpret_cast<sockaddr_in *>(const_cast<sockaddr *>(local_sa));
+    pktinfo->ipi_spec_dst = addrin->sin_addr;
+    break;
+  }
+  case AF_INET6: {
+    controllen += CMSG_SPACE(sizeof(in6_pktinfo));
+    cm->cmsg_level = IPPROTO_IPV6;
+    cm->cmsg_type = IPV6_PKTINFO;
+    cm->cmsg_len = CMSG_LEN(sizeof(in6_pktinfo));
+    auto pktinfo = reinterpret_cast<in6_pktinfo *>(CMSG_DATA(cm));
+    memset(pktinfo, 0, sizeof(in6_pktinfo));
+    auto addrin =
+        reinterpret_cast<sockaddr_in6 *>(const_cast<sockaddr *>(local_sa));
+    pktinfo->ipi6_addr = addrin->sin6_addr;
+    break;
+  }
+  default:
+    assert(0);
+  }
+
+#ifdef UDP_SEGMENT
+  if (gso_size && datalen > gso_size) {
+    controllen += CMSG_SPACE(sizeof(uint16_t));
+    cm = CMSG_NXTHDR(&msg, cm);
+    cm->cmsg_level = SOL_UDP;
+    cm->cmsg_type = UDP_SEGMENT;
+    cm->cmsg_len = CMSG_LEN(sizeof(uint16_t));
+    *(reinterpret_cast<uint16_t *>(CMSG_DATA(cm))) = gso_size;
+  }
+#endif // UDP_SEGMENT
+
+  msg.msg_controllen = controllen;
+
+  ssize_t nwrite;
+
+  do {
+    nwrite = sendmsg(faddr->fd, &msg, 0);
+  } while (nwrite == -1 && errno == EINTR);
+
+  if (nwrite == -1) {
+    return -1;
+  }
+
+  if (LOG_ENABLED(INFO)) {
+    LOG(INFO) << "QUIC sent packet: local="
+              << util::to_numeric_addr(local_sa, local_salen)
+              << " remote=" << util::to_numeric_addr(remote_sa, remote_salen)
+              << " " << nwrite << " bytes";
+  }
+
+  return 0;
+}
+
+int generate_quic_connection_id(ngtcp2_cid *cid, size_t cidlen) {
+  if (RAND_bytes(cid->data, cidlen) != 1) {
+    return -1;
+  }
+
+  cid->datalen = cidlen;
+
+  return 0;
+}
+
+int generate_quic_stateless_reset_token(uint8_t *token, const ngtcp2_cid *cid,
+                                        const uint8_t *secret,
+                                        size_t secretlen) {
+  ngtcp2_crypto_md md;
+  ngtcp2_crypto_md_init(&md, const_cast<EVP_MD *>(EVP_sha256()));
+
+  if (ngtcp2_crypto_generate_stateless_reset_token(token, &md, secret,
+                                                   secretlen, cid) != 0) {
+    return -1;
+  }
+
+  return 0;
+}
+
+} // namespace shrpx

src/shrpx_quic.h

@@ -0,0 +1,58 @@
+/*
+ * 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_QUIC_H
+#define SHRPX_QUIC_H
+
+#include "shrpx.h"
+
+#include <stdint.h>
+
+#include <ngtcp2/ngtcp2.h>
+
+namespace shrpx {
+
+struct UpstreamAddr;
+
+constexpr size_t SHRPX_QUIC_SCIDLEN = 20;
+constexpr size_t SHRPX_MAX_UDP_PAYLOAD_SIZE = 1280;
+
+ngtcp2_tstamp quic_timestamp();
+
+int create_quic_server_socket(UpstreamAddr &addr);
+
+int quic_send_packet(const UpstreamAddr *faddr, const sockaddr *remote_sa,
+                     size_t remote_salen, const sockaddr *local_sa,
+                     size_t local_salen, const uint8_t *data, size_t datalen,
+                     size_t gso_size);
+
+int generate_quic_connection_id(ngtcp2_cid *cid, size_t cidlen);
+
+int generate_quic_stateless_reset_token(uint8_t *token, const ngtcp2_cid *cid,
+                                        const uint8_t *secret,
+                                        size_t secretlen);
+
+} // namespace shrpx
+
+#endif // SHRPX_QUIC_H

src/shrpx_quic_connection_handler.cc

@@ -0,0 +1,286 @@
+/*
+ * 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.
+ */
+#include "shrpx_quic_connection_handler.h"
+
+#include <openssl/rand.h>
+
+#include <ngtcp2/ngtcp2.h>
+
+#include "shrpx_worker.h"
+#include "shrpx_client_handler.h"
+#include "shrpx_log.h"
+#include "shrpx_quic.h"
+#include "shrpx_http3_upstream.h"
+
+namespace shrpx {
+
+QUICConnectionHandler::QUICConnectionHandler(Worker *worker)
+    : worker_{worker} {}
+
+QUICConnectionHandler::~QUICConnectionHandler() {}
+
+namespace {
+std::string make_cid_key(const uint8_t *dcid, size_t dcidlen) {
+  return std::string{dcid, dcid + dcidlen};
+}
+} // namespace
+
+namespace {
+std::string make_cid_key(const ngtcp2_cid *cid) {
+  return make_cid_key(cid->data, cid->datalen);
+}
+} // namespace
+
+int QUICConnectionHandler::handle_packet(const UpstreamAddr *faddr,
+                                         const Address &remote_addr,
+                                         const Address &local_addr,
+                                         const uint8_t *data, size_t datalen) {
+  int rv;
+  uint32_t version;
+  const uint8_t *dcid, *scid;
+  size_t dcidlen, scidlen;
+
+  rv = ngtcp2_pkt_decode_version_cid(&version, &dcid, &dcidlen, &scid, &scidlen,
+                                     data, datalen, SHRPX_QUIC_SCIDLEN);
+  if (rv != 0) {
+    if (rv == 1) {
+      send_version_negotiation(faddr, version, scid, scidlen, dcid, dcidlen,
+                               remote_addr, local_addr);
+    }
+
+    return 0;
+  }
+
+  auto dcid_key = make_cid_key(dcid, dcidlen);
+
+  ClientHandler *handler;
+
+  auto it = connections_.find(dcid_key);
+  if (it == std::end(connections_)) {
+    // new connection
+
+    ngtcp2_pkt_hd hd;
+
+    switch (ngtcp2_accept(&hd, data, datalen)) {
+    case 0:
+      break;
+    case NGTCP2_ERR_RETRY:
+      // TODO Send retry
+      return 0;
+    case NGTCP2_ERR_VERSION_NEGOTIATION:
+      send_version_negotiation(faddr, version, scid, scidlen, dcid, dcidlen,
+                               remote_addr, local_addr);
+      return 0;
+    default:
+      // TODO Must be rate limited
+      send_stateless_reset(faddr, dcid, dcidlen, remote_addr, local_addr);
+      return 0;
+    }
+
+    handler = handle_new_connection(faddr, remote_addr, local_addr, hd);
+    if (handler == nullptr) {
+      return 0;
+    }
+  } else {
+    handler = (*it).second;
+  }
+
+  if (handler->read_quic(faddr, remote_addr, local_addr, data, datalen) != 0) {
+    delete handler;
+    return 0;
+  }
+
+  handler->signal_write();
+
+  return 0;
+}
+
+ClientHandler *QUICConnectionHandler::handle_new_connection(
+    const UpstreamAddr *faddr, const Address &remote_addr,
+    const Address &local_addr, const ngtcp2_pkt_hd &hd) {
+  std::array<char, NI_MAXHOST> host;
+  std::array<char, NI_MAXSERV> service;
+  int rv;
+
+  rv = getnameinfo(&remote_addr.su.sa, remote_addr.len, host.data(),
+                   host.size(), service.data(), service.size(),
+                   NI_NUMERICHOST | NI_NUMERICSERV);
+  if (rv != 0) {
+    LOG(ERROR) << "getnameinfo() failed: " << gai_strerror(rv);
+
+    return nullptr;
+  }
+
+  auto ssl_ctx = worker_->get_quic_sv_ssl_ctx();
+
+  assert(ssl_ctx);
+
+  auto ssl = tls::create_ssl(ssl_ctx);
+  if (ssl == nullptr) {
+    return nullptr;
+  }
+
+  assert(SSL_is_quic(ssl));
+
+  SSL_set_accept_state(ssl);
+  SSL_set_quic_early_data_enabled(ssl, 1);
+
+  // Disable TLS session ticket if we don't have working ticket
+  // keys.
+  if (!worker_->get_ticket_keys()) {
+    SSL_set_options(ssl, SSL_OP_NO_TICKET);
+  }
+
+  auto handler = std::make_unique<ClientHandler>(
+      worker_, faddr->fd, ssl, StringRef{host.data()},
+      StringRef{service.data()}, remote_addr.su.sa.sa_family, faddr);
+
+  auto upstream = std::make_unique<Http3Upstream>(handler.get());
+  if (upstream->init(faddr, remote_addr, local_addr, hd) != 0) {
+    return nullptr;
+  }
+
+  handler->setup_http3_upstream(std::move(upstream));
+
+  return handler.release();
+}
+
+namespace {
+uint32_t generate_reserved_version(const Address &addr, uint32_t version) {
+  uint32_t h = 0x811C9DC5u;
+  const uint8_t *p = reinterpret_cast<const uint8_t *>(&addr.su.sa);
+  const uint8_t *ep = p + addr.len;
+
+  for (; p != ep; ++p) {
+    h ^= *p;
+    h *= 0x01000193u;
+  }
+
+  version = htonl(version);
+  p = (const uint8_t *)&version;
+  ep = p + sizeof(version);
+
+  for (; p != ep; ++p) {
+    h ^= *p;
+    h *= 0x01000193u;
+  }
+
+  h &= 0xf0f0f0f0u;
+  h |= 0x0a0a0a0au;
+
+  return h;
+}
+} // namespace
+
+int QUICConnectionHandler::send_version_negotiation(
+    const UpstreamAddr *faddr, uint32_t version, const uint8_t *dcid,
+    size_t dcidlen, const uint8_t *scid, size_t scidlen,
+    const Address &remote_addr, const Address &local_addr) {
+  std::array<uint32_t, 2> sv;
+
+  sv[0] = generate_reserved_version(remote_addr, version);
+  sv[1] = NGTCP2_PROTO_VER_V1;
+
+  std::array<uint8_t, 1280> buf;
+
+  uint8_t rand_byte;
+  util::random_bytes(&rand_byte, &rand_byte + 1, worker_->get_randgen());
+
+  auto nwrite = ngtcp2_pkt_write_version_negotiation(
+      buf.data(), buf.size(), rand_byte, dcid, dcidlen, scid, scidlen,
+      sv.data(), sv.size());
+  if (nwrite < 0) {
+    LOG(ERROR) << "ngtcp2_pkt_write_version_negotiation: "
+               << ngtcp2_strerror(nwrite);
+    return -1;
+  }
+
+  return quic_send_packet(faddr, &remote_addr.su.sa, remote_addr.len,
+                          &local_addr.su.sa, local_addr.len, buf.data(), nwrite,
+                          0);
+}
+
+int QUICConnectionHandler::send_stateless_reset(const UpstreamAddr *faddr,
+                                                const uint8_t *dcid,
+                                                size_t dcidlen,
+                                                const Address &remote_addr,
+                                                const Address &local_addr) {
+  int rv;
+  std::array<uint8_t, NGTCP2_STATELESS_RESET_TOKENLEN> token;
+  ngtcp2_cid cid;
+
+  ngtcp2_cid_init(&cid, dcid, dcidlen);
+
+  auto config = get_config();
+  auto &quicconf = config->quic;
+  auto &stateless_resetconf = quicconf.stateless_reset;
+
+  rv = generate_quic_stateless_reset_token(token.data(), &cid,
+                                           stateless_resetconf.secret.data(),
+                                           stateless_resetconf.secret.size());
+  if (rv != 0) {
+    return -1;
+  }
+
+  std::array<uint8_t, NGTCP2_MIN_STATELESS_RESET_RANDLEN> rand_bytes;
+
+  if (RAND_bytes(rand_bytes.data(), rand_bytes.size()) != 1) {
+    return -1;
+  }
+
+  std::array<uint8_t, 1280> buf;
+
+  auto nwrite =
+      ngtcp2_pkt_write_stateless_reset(buf.data(), buf.size(), token.data(),
+                                       rand_bytes.data(), rand_bytes.size());
+  if (nwrite < 0) {
+    LOG(ERROR) << "ngtcp2_pkt_write_stateless_reset: "
+               << ngtcp2_strerror(nwrite);
+    return -1;
+  }
+
+  if (LOG_ENABLED(INFO)) {
+    LOG(INFO) << "Send stateless_reset to remote="
+              << util::to_numeric_addr(&remote_addr)
+              << " dcid=" << util::format_hex(dcid, dcidlen);
+  }
+
+  return quic_send_packet(faddr, &remote_addr.su.sa, remote_addr.len,
+                          &local_addr.su.sa, local_addr.len, buf.data(), nwrite,
+                          0);
+}
+
+void QUICConnectionHandler::add_connection_id(const ngtcp2_cid *cid,
+                                              ClientHandler *handler) {
+  auto key = make_cid_key(cid);
+  connections_.emplace(key, handler);
+}
+
+void QUICConnectionHandler::remove_connection_id(const ngtcp2_cid *cid) {
+  auto key = make_cid_key(cid);
+  connections_.erase(key);
+}
+
+} // namespace shrpx

src/shrpx_quic_connection_handler.h

@@ -0,0 +1,75 @@
+/*
+ * 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_QUIC_CONNECTION_HANDLER_H
+#define SHRPX_QUIC_CONNECTION_HANDLER_H
+
+#include "shrpx.h"
+
+#include <memory>
+#include <unordered_map>
+#include <string>
+
+#include <ngtcp2/ngtcp2.h>
+
+#include "network.h"
+
+using namespace nghttp2;
+
+namespace shrpx {
+
+struct UpstreamAddr;
+class ClientHandler;
+class Worker;
+
+class QUICConnectionHandler {
+public:
+  QUICConnectionHandler(Worker *worker);
+  ~QUICConnectionHandler();
+  int handle_packet(const UpstreamAddr *faddr, const Address &remote_addr,
+                    const Address &local_addr, const uint8_t *data,
+                    size_t datalen);
+  int send_version_negotiation(const UpstreamAddr *faddr, uint32_t version,
+                               const uint8_t *dcid, size_t dcidlen,
+                               const uint8_t *scid, size_t scidlen,
+                               const Address &remote_addr,
+                               const Address &local_addr);
+  int send_stateless_reset(const UpstreamAddr *faddr, const uint8_t *dcid,
+                           size_t dcidlen, const Address &remote_addr,
+                           const Address &local_addr);
+  ClientHandler *handle_new_connection(const UpstreamAddr *faddr,
+                                       const Address &remote_addr,
+                                       const Address &local_addr,
+                                       const ngtcp2_pkt_hd &hd);
+  void add_connection_id(const ngtcp2_cid *cid, ClientHandler *handler);
+  void remove_connection_id(const ngtcp2_cid *cid);
+
+private:
+  Worker *worker_;
+  std::unordered_map<std::string, ClientHandler *> connections_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_QUIC_CONNECTION_HANDLER_H

src/shrpx_quic_listener.cc

@@ -0,0 +1,106 @@
+/*
+ * 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.
+ */
+#include "shrpx_quic_listener.h"
+#include "shrpx_worker.h"
+#include "shrpx_config.h"
+#include "shrpx_log.h"
+
+namespace shrpx {
+
+namespace {
+void readcb(struct ev_loop *loop, ev_io *w, int revent) {
+  auto l = static_cast<QUICListener *>(w->data);
+  l->on_read();
+}
+} // namespace
+
+QUICListener::QUICListener(const UpstreamAddr *faddr, Worker *worker)
+    : faddr_{faddr}, worker_{worker} {
+  ev_io_init(&rev_, readcb, faddr_->fd, EV_READ);
+  rev_.data = this;
+  ev_io_start(worker_->get_loop(), &rev_);
+}
+
+QUICListener::~QUICListener() {
+  ev_io_stop(worker_->get_loop(), &rev_);
+  close(faddr_->fd);
+}
+
+void QUICListener::on_read() {
+  sockaddr_union su;
+  std::array<uint8_t, 64_k> buf;
+  size_t pktcnt = 0;
+  iovec msg_iov{buf.data(), buf.size()};
+
+  msghdr msg{};
+  msg.msg_name = &su;
+  msg.msg_iov = &msg_iov;
+  msg.msg_iovlen = 1;
+
+  uint8_t msg_ctrl[CMSG_SPACE(sizeof(in6_pktinfo))];
+  msg.msg_control = msg_ctrl;
+
+  auto quic_conn_handler = worker_->get_quic_connection_handler();
+
+  for (; pktcnt < 10;) {
+    msg.msg_namelen = sizeof(su);
+    msg.msg_controllen = sizeof(msg_ctrl);
+
+    auto nread = recvmsg(faddr_->fd, &msg, 0);
+    if (nread == -1) {
+      return;
+    }
+
+    ++pktcnt;
+
+    Address local_addr{};
+    if (util::msghdr_get_local_addr(local_addr, &msg, su.storage.ss_family) !=
+        0) {
+      continue;
+    }
+
+    util::set_port(local_addr, faddr_->port);
+
+    if (LOG_ENABLED(INFO)) {
+      LOG(INFO) << "QUIC received packet: local="
+                << util::to_numeric_addr(&local_addr)
+                << " remote=" << util::to_numeric_addr(&su.sa, msg.msg_namelen)
+                << " " << nread << " bytes";
+    }
+
+    if (nread == 0) {
+      continue;
+    }
+
+    Address remote_addr;
+    remote_addr.su = su;
+    remote_addr.len = msg.msg_namelen;
+
+    quic_conn_handler->handle_packet(faddr_, remote_addr, local_addr,
+                                     buf.data(), nread);
+  }
+}
+
+} // namespace shrpx

src/shrpx_quic_listener.h

@@ -0,0 +1,51 @@
+/*
+ * 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_QUIC_LISTENER_H
+#define SHRPX_QUIC_LISTENER_H
+
+#include "shrpx.h"
+
+#include <ev.h>
+
+namespace shrpx {
+
+struct UpstreamAddr;
+class Worker;
+
+class QUICListener {
+public:
+  QUICListener(const UpstreamAddr *faddr, Worker *worker);
+  ~QUICListener();
+  void on_read();
+
+private:
+  const UpstreamAddr *faddr_;
+  Worker *worker_;
+  ev_io rev_;
+};
+
+} // namespace shrpx
+
+#endif // SHRPX_QUIC_LISTENER_H

src/shrpx_tls.cc

@@ -51,6 +51,12 @@
 
 #include <nghttp2/nghttp2.h>
 
+#ifdef ENABLE_HTTP3
+#  include <ngtcp2/ngtcp2.h>
+#  include <ngtcp2/ngtcp2_crypto.h>
+#  include <ngtcp2/ngtcp2_crypto_openssl.h>
+#endif // ENABLE_HTTP3
+
 #include "shrpx_log.h"
 #include "shrpx_client_handler.h"
 #include "shrpx_config.h"
@@ -60,6 +66,9 @@
 #include "shrpx_memcached_request.h"
 #include "shrpx_memcached_dispatcher.h"
 #include "shrpx_connection_handler.h"
+#ifdef ENABLE_HTTP3
+#  include "shrpx_http3_upstream.h"
+#endif // ENABLE_HTTP3
 #include "util.h"
 #include "tls.h"
 #include "template.h"
@@ -180,7 +189,12 @@ int servername_callback(SSL *ssl, int *al, void *arg) {
 
   auto hostname = StringRef{std::begin(buf), end_buf};
 
+#ifdef ENABLE_HTTP3
+  auto cert_tree = SSL_is_quic(ssl) ? worker->get_quic_cert_lookup_tree()
+                                    : worker->get_cert_lookup_tree();
+#else  // !ENABLE_HTTP3
   auto cert_tree = worker->get_cert_lookup_tree();
+#endif // !ENABLE_HTTP3
 
   auto idx = cert_tree->lookup(hostname);
   if (idx == -1) {
@@ -191,7 +205,14 @@ int servername_callback(SSL *ssl, int *al, void *arg) {
 
   auto conn_handler = worker->get_connection_handler();
 
+#ifdef ENABLE_HTTP3
+  const auto &ssl_ctx_list = SSL_is_quic(ssl)
+                                 ? conn_handler->get_quic_indexed_ssl_ctx(idx)
+                                 : conn_handler->get_indexed_ssl_ctx(idx);
+#else  // !ENABLE_HTTP3
   const auto &ssl_ctx_list = conn_handler->get_indexed_ssl_ctx(idx);
+#endif // !ENABLE_HTTP3
+
   assert(!ssl_ctx_list.empty());
 
 #if !defined(OPENSSL_IS_BORINGSSL) && !LIBRESSL_IN_USE &&                      \
@@ -600,6 +621,34 @@ int alpn_select_proto_cb(SSL *ssl, const unsigned char **out,
 } // namespace
 #endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
 
+#ifdef ENABLE_HTTP3
+#  if OPENSSL_VERSION_NUMBER >= 0x10002000L
+namespace {
+int quic_alpn_select_proto_cb(SSL *ssl, const unsigned char **out,
+                              unsigned char *outlen, const unsigned char *in,
+                              unsigned int inlen, void *arg) {
+  for (auto p = in, end = in + inlen; p < end;) {
+    auto proto_id = p + 1;
+    auto proto_len = *p;
+
+    if (proto_id + proto_len <= end &&
+        util::streq_l("h3", StringRef{proto_id, proto_len})) {
+
+      *out = reinterpret_cast<const unsigned char *>(proto_id);
+      *outlen = proto_len;
+
+      return SSL_TLSEXT_ERR_OK;
+    }
+
+    p += 1 + proto_len;
+  }
+
+  return SSL_TLSEXT_ERR_NOACK;
+}
+} // namespace
+#  endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
+#endif   // ENABLE_HTTP3
+
 #if !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L
 
 #  ifndef TLSEXT_TYPE_signed_certificate_timestamp
@@ -1042,6 +1091,328 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file,
   return ssl_ctx;
 }
 
+#ifdef ENABLE_HTTP3
+namespace {
+int quic_set_encryption_secrets(SSL *ssl, OSSL_ENCRYPTION_LEVEL ossl_level,
+                                const uint8_t *rx_secret,
+                                const uint8_t *tx_secret, size_t secretlen) {
+  auto conn = static_cast<Connection *>(SSL_get_app_data(ssl));
+  auto handler = static_cast<ClientHandler *>(conn->data);
+  auto upstream = static_cast<Http3Upstream *>(handler->get_upstream());
+  auto level = ngtcp2_crypto_openssl_from_ossl_encryption_level(ossl_level);
+
+  if (upstream->on_rx_secret(level, rx_secret, secretlen) != 0) {
+    return 0;
+  }
+
+  if (tx_secret && upstream->on_tx_secret(level, tx_secret, secretlen) != 0) {
+    return 0;
+  }
+
+  return 1;
+}
+} // namespace
+
+namespace {
+int quic_add_handshake_data(SSL *ssl, OSSL_ENCRYPTION_LEVEL ossl_level,
+                            const uint8_t *data, size_t len) {
+  auto conn = static_cast<Connection *>(SSL_get_app_data(ssl));
+  auto handler = static_cast<ClientHandler *>(conn->data);
+  auto upstream = static_cast<Http3Upstream *>(handler->get_upstream());
+  auto level = ngtcp2_crypto_openssl_from_ossl_encryption_level(ossl_level);
+
+  upstream->add_crypto_data(level, data, len);
+
+  return 1;
+}
+} // namespace
+
+namespace {
+int quic_flush_flight(SSL *ssl) { return 1; }
+} // namespace
+
+namespace {
+int quic_send_alert(SSL *ssl, OSSL_ENCRYPTION_LEVEL ossl_level, uint8_t alert) {
+  auto conn = static_cast<Connection *>(SSL_get_app_data(ssl));
+  auto handler = static_cast<ClientHandler *>(conn->data);
+  auto upstream = static_cast<Http3Upstream *>(handler->get_upstream());
+
+  if (!upstream) {
+    return 1;
+  }
+
+  upstream->set_tls_alert(alert);
+
+  return 1;
+}
+} // namespace
+
+namespace {
+auto quic_method = SSL_QUIC_METHOD{
+    quic_set_encryption_secrets,
+    quic_add_handshake_data,
+    quic_flush_flight,
+    quic_send_alert,
+};
+} // namespace
+
+SSL_CTX *create_quic_ssl_context(const char *private_key_file,
+                                 const char *cert_file,
+                                 const std::vector<uint8_t> &sct_data
+#  ifdef HAVE_NEVERBLEED
+                                 ,
+                                 neverbleed_t *nb
+#  endif // HAVE_NEVERBLEED
+) {
+  auto ssl_ctx = SSL_CTX_new(TLS_server_method());
+  if (!ssl_ctx) {
+    LOG(FATAL) << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+
+  constexpr auto ssl_opts =
+      (SSL_OP_ALL & ~SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS) |
+      SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_SINGLE_ECDH_USE |
+      SSL_OP_SINGLE_DH_USE |
+      SSL_OP_CIPHER_SERVER_PREFERENCE
+#  if OPENSSL_1_1_1_API
+      // The reason for disabling built-in anti-replay in OpenSSL is
+      // that it only works if client gets back to the same server.
+      // The freshness check described in
+      // https://tools.ietf.org/html/rfc8446#section-8.3 is still
+      // performed.
+      | SSL_OP_NO_ANTI_REPLAY
+#  endif // OPENSSL_1_1_1_API
+      ;
+
+  auto config = mod_config();
+  auto &tlsconf = config->tls;
+
+  SSL_CTX_set_options(ssl_ctx, ssl_opts);
+
+  SSL_CTX_set_min_proto_version(ssl_ctx, TLS1_3_VERSION);
+  SSL_CTX_set_max_proto_version(ssl_ctx, TLS1_3_VERSION);
+
+  const unsigned char sid_ctx[] = "shrpx";
+  SSL_CTX_set_session_id_context(ssl_ctx, sid_ctx, sizeof(sid_ctx) - 1);
+  SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_SERVER);
+
+  if (!tlsconf.session_cache.memcached.host.empty()) {
+    SSL_CTX_sess_set_new_cb(ssl_ctx, tls_session_new_cb);
+    SSL_CTX_sess_set_get_cb(ssl_ctx, tls_session_get_cb);
+  }
+
+  SSL_CTX_set_timeout(ssl_ctx, tlsconf.session_timeout.count());
+
+  if (SSL_CTX_set_cipher_list(ssl_ctx, tlsconf.ciphers.c_str()) == 0) {
+    LOG(FATAL) << "SSL_CTX_set_cipher_list " << tlsconf.ciphers
+               << " failed: " << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+
+#  if OPENSSL_1_1_1_API
+  if (SSL_CTX_set_ciphersuites(ssl_ctx, tlsconf.tls13_ciphers.c_str()) == 0) {
+    LOG(FATAL) << "SSL_CTX_set_ciphersuites " << tlsconf.tls13_ciphers
+               << " failed: " << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+#  endif // OPENSSL_1_1_1_API
+
+#  ifndef OPENSSL_NO_EC
+#    if !LIBRESSL_LEGACY_API && OPENSSL_VERSION_NUMBER >= 0x10002000L
+  if (SSL_CTX_set1_curves_list(ssl_ctx, tlsconf.ecdh_curves.c_str()) != 1) {
+    LOG(FATAL) << "SSL_CTX_set1_curves_list " << tlsconf.ecdh_curves
+               << " failed";
+    DIE();
+  }
+#      if !defined(OPENSSL_IS_BORINGSSL) && !OPENSSL_1_1_API
+  // It looks like we need this function call for OpenSSL 1.0.2.  This
+  // function was deprecated in OpenSSL 1.1.0 and BoringSSL.
+  SSL_CTX_set_ecdh_auto(ssl_ctx, 1);
+#      endif // !defined(OPENSSL_IS_BORINGSSL) && !OPENSSL_1_1_API
+#    else    // LIBRESSL_LEGACY_API || OPENSSL_VERSION_NUBMER < 0x10002000L
+  // Use P-256, which is sufficiently secure at the time of this
+  // writing.
+  auto ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
+  if (ecdh == nullptr) {
+    LOG(FATAL) << "EC_KEY_new_by_curv_name failed: "
+               << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+  SSL_CTX_set_tmp_ecdh(ssl_ctx, ecdh);
+  EC_KEY_free(ecdh);
+#    endif   // LIBRESSL_LEGACY_API || OPENSSL_VERSION_NUBMER < 0x10002000L
+#  endif     // OPENSSL_NO_EC
+
+  if (!tlsconf.dh_param_file.empty()) {
+    // Read DH parameters from file
+    auto bio = BIO_new_file(tlsconf.dh_param_file.c_str(), "r");
+    if (bio == nullptr) {
+      LOG(FATAL) << "BIO_new_file() failed: "
+                 << ERR_error_string(ERR_get_error(), nullptr);
+      DIE();
+    }
+    auto dh = PEM_read_bio_DHparams(bio, nullptr, nullptr, nullptr);
+    if (dh == nullptr) {
+      LOG(FATAL) << "PEM_read_bio_DHparams() failed: "
+                 << ERR_error_string(ERR_get_error(), nullptr);
+      DIE();
+    }
+    SSL_CTX_set_tmp_dh(ssl_ctx, dh);
+    DH_free(dh);
+    BIO_free(bio);
+  }
+
+  SSL_CTX_set_mode(ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
+
+  if (SSL_CTX_set_default_verify_paths(ssl_ctx) != 1) {
+    LOG(WARN) << "Could not load system trusted ca certificates: "
+              << ERR_error_string(ERR_get_error(), nullptr);
+  }
+
+  if (!tlsconf.cacert.empty()) {
+    if (SSL_CTX_load_verify_locations(ssl_ctx, tlsconf.cacert.c_str(),
+                                      nullptr) != 1) {
+      LOG(FATAL) << "Could not load trusted ca certificates from "
+                 << tlsconf.cacert << ": "
+                 << ERR_error_string(ERR_get_error(), nullptr);
+      DIE();
+    }
+  }
+
+  if (!tlsconf.private_key_passwd.empty()) {
+    SSL_CTX_set_default_passwd_cb(ssl_ctx, ssl_pem_passwd_cb);
+    SSL_CTX_set_default_passwd_cb_userdata(ssl_ctx, config);
+  }
+
+#  ifndef HAVE_NEVERBLEED
+  if (SSL_CTX_use_PrivateKey_file(ssl_ctx, private_key_file,
+                                  SSL_FILETYPE_PEM) != 1) {
+    LOG(FATAL) << "SSL_CTX_use_PrivateKey_file failed: "
+               << ERR_error_string(ERR_get_error(), nullptr);
+  }
+#  else  // HAVE_NEVERBLEED
+  std::array<char, NEVERBLEED_ERRBUF_SIZE> errbuf;
+  if (neverbleed_load_private_key_file(nb, ssl_ctx, private_key_file,
+                                       errbuf.data()) != 1) {
+    LOG(FATAL) << "neverbleed_load_private_key_file failed: " << errbuf.data();
+    DIE();
+  }
+#  endif // HAVE_NEVERBLEED
+
+  if (SSL_CTX_use_certificate_chain_file(ssl_ctx, cert_file) != 1) {
+    LOG(FATAL) << "SSL_CTX_use_certificate_file failed: "
+               << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+  if (SSL_CTX_check_private_key(ssl_ctx) != 1) {
+    LOG(FATAL) << "SSL_CTX_check_private_key failed: "
+               << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+  if (tlsconf.client_verify.enabled) {
+    if (!tlsconf.client_verify.cacert.empty()) {
+      if (SSL_CTX_load_verify_locations(
+              ssl_ctx, tlsconf.client_verify.cacert.c_str(), nullptr) != 1) {
+
+        LOG(FATAL) << "Could not load trusted ca certificates from "
+                   << tlsconf.client_verify.cacert << ": "
+                   << ERR_error_string(ERR_get_error(), nullptr);
+        DIE();
+      }
+      // It is heard that SSL_CTX_load_verify_locations() may leave
+      // error even though it returns success. See
+      // http://forum.nginx.org/read.php?29,242540
+      ERR_clear_error();
+      auto list = SSL_load_client_CA_file(tlsconf.client_verify.cacert.c_str());
+      if (!list) {
+        LOG(FATAL) << "Could not load ca certificates from "
+                   << tlsconf.client_verify.cacert << ": "
+                   << ERR_error_string(ERR_get_error(), nullptr);
+        DIE();
+      }
+      SSL_CTX_set_client_CA_list(ssl_ctx, list);
+    }
+    SSL_CTX_set_verify(ssl_ctx,
+                       SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE |
+                           SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
+                       verify_callback);
+  }
+  SSL_CTX_set_tlsext_servername_callback(ssl_ctx, servername_callback);
+  SSL_CTX_set_tlsext_ticket_key_cb(ssl_ctx, ticket_key_cb);
+#  ifndef OPENSSL_IS_BORINGSSL
+  SSL_CTX_set_tlsext_status_cb(ssl_ctx, ocsp_resp_cb);
+#  endif // OPENSSL_IS_BORINGSSL
+
+#  ifdef OPENSSL_IS_BORINGSSL
+  SSL_CTX_set_early_data_enabled(ssl_ctx, 1);
+#  endif // OPENSSL_IS_BORINGSSL
+
+#  if OPENSSL_VERSION_NUMBER >= 0x10002000L
+  // ALPN selection callback
+  SSL_CTX_set_alpn_select_cb(ssl_ctx, quic_alpn_select_proto_cb, nullptr);
+#  endif // OPENSSL_VERSION_NUMBER >= 0x10002000L
+
+#  if !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L &&             \
+      !defined(OPENSSL_IS_BORINGSSL)
+  // SSL_extension_supported(TLSEXT_TYPE_signed_certificate_timestamp)
+  // returns 1, which means OpenSSL internally handles it.  But
+  // OpenSSL handles signed_certificate_timestamp extension specially,
+  // and it lets custom handler to process the extension.
+  if (!sct_data.empty()) {
+#    if OPENSSL_1_1_1_API
+    // It is not entirely clear to me that SSL_EXT_CLIENT_HELLO is
+    // required here.  sct_parse_cb is called without
+    // SSL_EXT_CLIENT_HELLO being set.  But the passed context value
+    // is SSL_EXT_CLIENT_HELLO.
+    if (SSL_CTX_add_custom_ext(
+            ssl_ctx, TLSEXT_TYPE_signed_certificate_timestamp,
+            SSL_EXT_CLIENT_HELLO | SSL_EXT_TLS1_2_SERVER_HELLO |
+                SSL_EXT_TLS1_3_CERTIFICATE | SSL_EXT_IGNORE_ON_RESUMPTION,
+            sct_add_cb, sct_free_cb, nullptr, sct_parse_cb, nullptr) != 1) {
+      LOG(FATAL) << "SSL_CTX_add_custom_ext failed: "
+                 << ERR_error_string(ERR_get_error(), nullptr);
+      DIE();
+    }
+#    else  // !OPENSSL_1_1_1_API
+    if (SSL_CTX_add_server_custom_ext(
+            ssl_ctx, TLSEXT_TYPE_signed_certificate_timestamp,
+            legacy_sct_add_cb, legacy_sct_free_cb, nullptr, legacy_sct_parse_cb,
+            nullptr) != 1) {
+      LOG(FATAL) << "SSL_CTX_add_server_custom_ext failed: "
+                 << ERR_error_string(ERR_get_error(), nullptr);
+      DIE();
+    }
+#    endif // !OPENSSL_1_1_1_API
+  }
+#  endif // !LIBRESSL_IN_USE && OPENSSL_VERSION_NUMBER >= 0x10002000L &&
+         // !defined(OPENSSL_IS_BORINGSSL)
+
+#  if OPENSSL_1_1_1_API
+  if (SSL_CTX_set_max_early_data(ssl_ctx,
+                                 std::numeric_limits<uint32_t>::max()) != 1) {
+    LOG(FATAL) << "SSL_CTX_set_max_early_data failed: "
+               << ERR_error_string(ERR_get_error(), nullptr);
+    DIE();
+  }
+#  endif // OPENSSL_1_1_1_API
+
+#  ifndef OPENSSL_NO_PSK
+  SSL_CTX_set_psk_server_callback(ssl_ctx, psk_server_cb);
+#  endif // !LIBRESSL_NO_PSK
+
+  SSL_CTX_set_quic_method(ssl_ctx, &quic_method);
+
+  auto tls_ctx_data = new TLSContextData();
+  tls_ctx_data->cert_file = cert_file;
+  tls_ctx_data->sct_data = sct_data;
+
+  SSL_CTX_set_app_data(ssl_ctx, tls_ctx_data);
+
+  return ssl_ctx;
+}
+#endif // ENABLE_HTTP3
+
 namespace {
 int select_h2_next_proto_cb(SSL *ssl, unsigned char **out,
                             unsigned char *outlen, const unsigned char *in,
@@ -1747,6 +2118,12 @@ bool in_proto_list(const std::vector<StringRef> &protos,
 }
 
 bool upstream_tls_enabled(const ConnectionConfig &connconf) {
+#ifdef ENABLE_HTTP3
+  if (connconf.quic_listener.addrs.size()) {
+    return true;
+  }
+#endif // ENABLE_HTTP3
+
   const auto &faddrs = connconf.listener.addrs;
   return std::any_of(std::begin(faddrs), std::end(faddrs),
                      [](const UpstreamAddr &faddr) { return faddr.tls; });
@@ -1826,6 +2203,63 @@ setup_server_ssl_context(std::vector<SSL_CTX *> &all_ssl_ctx,
   return ssl_ctx;
 }
 
+#ifdef ENABLE_HTTP3
+SSL_CTX *setup_quic_server_ssl_context(
+    std::vector<SSL_CTX *> &all_ssl_ctx,
+    std::vector<std::vector<SSL_CTX *>> &indexed_ssl_ctx,
+    CertLookupTree *cert_tree
+#  ifdef HAVE_NEVERBLEED
+    ,
+    neverbleed_t *nb
+#  endif // HAVE_NEVERBLEED
+) {
+  auto config = get_config();
+
+  if (!upstream_tls_enabled(config->conn)) {
+    return nullptr;
+  }
+
+  auto &tlsconf = config->tls;
+
+  auto ssl_ctx =
+      create_quic_ssl_context(tlsconf.private_key_file.c_str(),
+                              tlsconf.cert_file.c_str(), tlsconf.sct_data
+#  ifdef HAVE_NEVERBLEED
+                              ,
+                              nb
+#  endif // HAVE_NEVERBLEED
+      );
+
+  all_ssl_ctx.push_back(ssl_ctx);
+
+  assert(cert_tree);
+
+  if (cert_lookup_tree_add_ssl_ctx(cert_tree, indexed_ssl_ctx, ssl_ctx) == -1) {
+    LOG(FATAL) << "Failed to add default certificate.";
+    DIE();
+  }
+
+  for (auto &c : tlsconf.subcerts) {
+    auto ssl_ctx = create_quic_ssl_context(c.private_key_file.c_str(),
+                                           c.cert_file.c_str(), c.sct_data
+#  ifdef HAVE_NEVERBLEED
+                                           ,
+                                           nb
+#  endif // HAVE_NEVERBLEED
+    );
+    all_ssl_ctx.push_back(ssl_ctx);
+
+    if (cert_lookup_tree_add_ssl_ctx(cert_tree, indexed_ssl_ctx, ssl_ctx) ==
+        -1) {
+      LOG(FATAL) << "Failed to add sub certificate.";
+      DIE();
+    }
+  }
+
+  return ssl_ctx;
+}
+#endif // ENABLE_HTTP3
+
 SSL_CTX *setup_downstream_client_ssl_context(
 #ifdef HAVE_NEVERBLEED
     neverbleed_t *nb

src/shrpx_tls.h

@@ -100,6 +100,18 @@ SSL_CTX *create_ssl_client_context(
                                 unsigned char *outlen, const unsigned char *in,
                                 unsigned int inlen, void *arg));
 
+#ifdef ENABLE_HTTP3
+SSL_CTX *create_quic_ssl_client_context(
+#  ifdef HAVE_NEVERBLEED
+    neverbleed_t *nb,
+#  endif // HAVE_NEVERBLEED
+    const StringRef &cacert, const StringRef &cert_file,
+    const StringRef &private_key_file,
+    int (*next_proto_select_cb)(SSL *s, unsigned char **out,
+                                unsigned char *outlen, const unsigned char *in,
+                                unsigned int inlen, void *arg));
+#endif // ENABLE_HTTP3
+
 ClientHandler *accept_connection(Worker *worker, int fd, sockaddr *addr,
                                  int addrlen, const UpstreamAddr *faddr);
 
@@ -217,6 +229,18 @@ setup_server_ssl_context(std::vector<SSL_CTX *> &all_ssl_ctx,
 #endif // HAVE_NEVERBLEED
 );
 
+#ifdef ENABLE_HTTP3
+SSL_CTX *setup_quic_server_ssl_context(
+    std::vector<SSL_CTX *> &all_ssl_ctx,
+    std::vector<std::vector<SSL_CTX *>> &indexed_ssl_ctx,
+    CertLookupTree *cert_tree
+#  ifdef HAVE_NEVERBLEED
+    ,
+    neverbleed_t *nb
+#  endif // HAVE_NEVERBLEED
+);
+#endif // ENABLE_HTTP3
+
 // Setups client side SSL_CTX.
 SSL_CTX *setup_downstream_client_ssl_context(
 #ifdef HAVE_NEVERBLEED

src/shrpx_worker.cc

@@ -39,6 +39,10 @@
 #ifdef HAVE_MRUBY
 #  include "shrpx_mruby.h"
 #endif // HAVE_MRUBY
+#ifdef ENABLE_HTTP3
+#  include "shrpx_quic.h"
+#  include "shrpx_quic_listener.h"
+#endif // ENABLE_HTTP3
 #include "util.h"
 #include "template.h"
 
@@ -131,17 +135,28 @@ create_downstream_key(const std::shared_ptr<SharedDownstreamAddr> &shared_addr,
 Worker::Worker(struct ev_loop *loop, SSL_CTX *sv_ssl_ctx, SSL_CTX *cl_ssl_ctx,
                SSL_CTX *tls_session_cache_memcached_ssl_ctx,
                tls::CertLookupTree *cert_tree,
+#ifdef ENABLE_HTTP3
+               SSL_CTX *quic_sv_ssl_ctx, tls::CertLookupTree *quic_cert_tree,
+#endif // ENABLE_HTTP3
                const std::shared_ptr<TicketKeys> &ticket_keys,
                ConnectionHandler *conn_handler,
                std::shared_ptr<DownstreamConfig> downstreamconf)
     : randgen_(util::make_mt19937()),
       worker_stat_{},
       dns_tracker_(loop),
+#ifdef ENABLE_HTTP3
+      quic_upstream_addrs_{get_config()->conn.quic_listener.addrs},
+#endif // ENABLE_HTTP3
       loop_(loop),
       sv_ssl_ctx_(sv_ssl_ctx),
       cl_ssl_ctx_(cl_ssl_ctx),
       cert_tree_(cert_tree),
       conn_handler_(conn_handler),
+#ifdef ENABLE_HTTP3
+      quic_sv_ssl_ctx_{quic_sv_ssl_ctx},
+      quic_cert_tree_{quic_cert_tree},
+      quic_conn_handler_{this},
+#endif // ENABLE_HTTP3
       ticket_keys_(ticket_keys),
       connect_blocker_(
           std::make_unique<ConnectBlocker>(randgen_, loop_, nullptr, nullptr)),
@@ -504,6 +519,12 @@ void Worker::process_events() {
 
 tls::CertLookupTree *Worker::get_cert_lookup_tree() const { return cert_tree_; }
 
+#ifdef ENABLE_HTTP3
+tls::CertLookupTree *Worker::get_quic_cert_lookup_tree() const {
+  return quic_cert_tree_;
+}
+#endif // ENABLE_HTTP3
+
 std::shared_ptr<TicketKeys> Worker::get_ticket_keys() {
 #ifdef HAVE_ATOMIC_STD_SHARED_PTR
   return std::atomic_load_explicit(&ticket_keys_, std::memory_order_acquire);
@@ -534,6 +555,10 @@ SSL_CTX *Worker::get_sv_ssl_ctx() const { return sv_ssl_ctx_; }
 
 SSL_CTX *Worker::get_cl_ssl_ctx() const { return cl_ssl_ctx_; }
 
+#ifdef ENABLE_HTTP3
+SSL_CTX *Worker::get_quic_sv_ssl_ctx() const { return quic_sv_ssl_ctx_; }
+#endif // ENABLE_HTTP3
+
 void Worker::set_graceful_shutdown(bool f) { graceful_shutdown_ = f; }
 
 bool Worker::get_graceful_shutdown() const { return graceful_shutdown_; }
@@ -578,8 +603,29 @@ ConnectionHandler *Worker::get_connection_handler() const {
   return conn_handler_;
 }
 
+#ifdef ENABLE_HTTP3
+QUICConnectionHandler *Worker::get_quic_connection_handler() {
+  return &quic_conn_handler_;
+}
+#endif // ENABLE_HTTP3
+
 DNSTracker *Worker::get_dns_tracker() { return &dns_tracker_; }
 
+#ifdef ENABLE_HTTP3
+int Worker::setup_quic_server_socket() {
+  for (auto &addr : quic_upstream_addrs_) {
+    assert(!addr.host_unix);
+    if (create_quic_server_socket(addr) != 0) {
+      return -1;
+    }
+
+    quic_listeners_.emplace_back(std::make_unique<QUICListener>(&addr, this));
+  }
+
+  return 0;
+}
+#endif // ENABLE_HTTP3
+
 namespace {
 size_t match_downstream_addr_group_host(
     const RouterConfig &routerconf, const StringRef &host,

src/shrpx_worker.h

@@ -50,6 +50,9 @@
 #include "shrpx_live_check.h"
 #include "shrpx_connect_blocker.h"
 #include "shrpx_dns_tracker.h"
+#ifdef ENABLE_HTTP3
+#  include "shrpx_quic_connection_handler.h"
+#endif // ENABLE_HTTP3
 #include "allocator.h"
 
 using namespace nghttp2;
@@ -61,6 +64,9 @@ class ConnectBlocker;
 class MemcachedDispatcher;
 struct UpstreamAddr;
 class ConnectionHandler;
+#ifdef ENABLE_HTTP3
+class QUICListener;
+#endif // ENABLE_HTTP3
 
 #ifdef HAVE_MRUBY
 namespace mruby {
@@ -270,6 +276,9 @@ public:
   Worker(struct ev_loop *loop, SSL_CTX *sv_ssl_ctx, SSL_CTX *cl_ssl_ctx,
          SSL_CTX *tls_session_cache_memcached_ssl_ctx,
          tls::CertLookupTree *cert_tree,
+#ifdef ENABLE_HTTP3
+         SSL_CTX *quic_sv_ssl_ctx, tls::CertLookupTree *quic_cert_tree,
+#endif // ENABLE_HTTP3
          const std::shared_ptr<TicketKeys> &ticket_keys,
          ConnectionHandler *conn_handler,
          std::shared_ptr<DownstreamConfig> downstreamconf);
@@ -280,6 +289,9 @@ public:
   void send(const WorkerEvent &event);
 
   tls::CertLookupTree *get_cert_lookup_tree() const;
+#ifdef ENABLE_HTTP3
+  tls::CertLookupTree *get_quic_cert_lookup_tree() const;
+#endif // ENABLE_HTTP3
 
   // These 2 functions make a lock m_ to get/set ticket keys
   // atomically.
@@ -290,6 +302,9 @@ public:
   struct ev_loop *get_loop() const;
   SSL_CTX *get_sv_ssl_ctx() const;
   SSL_CTX *get_cl_ssl_ctx() const;
+#ifdef ENABLE_HTTP3
+  SSL_CTX *get_quic_sv_ssl_ctx() const;
+#endif // ENABLE_HTTP3
 
   void set_graceful_shutdown(bool f);
   bool get_graceful_shutdown() const;
@@ -319,6 +334,12 @@ public:
 
   ConnectionHandler *get_connection_handler() const;
 
+#ifdef ENABLE_HTTP3
+  QUICConnectionHandler *get_quic_connection_handler();
+
+  int setup_quic_server_socket();
+#endif // ENABLE_HTTP3
+
   DNSTracker *get_dns_tracker();
 
 private:
@@ -335,6 +356,11 @@ private:
   WorkerStat worker_stat_;
   DNSTracker dns_tracker_;
 
+#ifdef ENABLE_HTTP3
+  std::vector<UpstreamAddr> quic_upstream_addrs_;
+  std::vector<std::unique_ptr<QUICListener>> quic_listeners_;
+#endif // ENABLE_HTTP3
+
   std::shared_ptr<DownstreamConfig> downstreamconf_;
   std::unique_ptr<MemcachedDispatcher> session_cache_memcached_dispatcher_;
 #ifdef HAVE_MRUBY
@@ -348,6 +374,12 @@ private:
   SSL_CTX *cl_ssl_ctx_;
   tls::CertLookupTree *cert_tree_;
   ConnectionHandler *conn_handler_;
+#ifdef ENABLE_HTTP3
+  SSL_CTX *quic_sv_ssl_ctx_;
+  tls::CertLookupTree *quic_cert_tree_;
+
+  QUICConnectionHandler quic_conn_handler_;
+#endif // ENABLE_HTTP3
 
 #ifndef HAVE_ATOMIC_STD_SHARED_PTR
   std::mutex ticket_keys_m_;

src/util.cc

@@ -686,18 +686,21 @@ std::string numeric_name(const struct sockaddr *sa, socklen_t salen) {
 }
 
 std::string to_numeric_addr(const Address *addr) {
-  auto family = addr->su.storage.ss_family;
+  return to_numeric_addr(&addr->su.sa, addr->len);
+}
+
+std::string to_numeric_addr(const struct sockaddr *sa, socklen_t salen) {
+  auto family = sa->sa_family;
 #ifndef _WIN32
   if (family == AF_UNIX) {
-    return addr->su.un.sun_path;
+    return reinterpret_cast<const sockaddr_un *>(sa)->sun_path;
   }
 #endif // !_WIN32
 
   std::array<char, NI_MAXHOST> host;
   std::array<char, NI_MAXSERV> serv;
-  auto rv =
+  auto rv = getnameinfo(sa, salen, host.data(), host.size(), serv.data(),
-      getnameinfo(&addr->su.sa, addr->len, host.data(), host.size(),
+                        serv.size(), NI_NUMERICHOST | NI_NUMERICSERV);
-                  serv.data(), serv.size(), NI_NUMERICHOST | NI_NUMERICSERV);
   if (rv != 0) {
     return "unknown";
   }
@@ -945,6 +948,56 @@ int create_nonblock_socket(int family) {
   return fd;
 }
 
+int create_nonblock_udp_socket(int family) {
+#ifdef SOCK_NONBLOCK
+  auto fd = socket(family, SOCK_DGRAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
+
+  if (fd == -1) {
+    return -1;
+  }
+#else  // !SOCK_NONBLOCK
+  auto fd = socket(family, SOCK_DGRAM, 0);
+
+  if (fd == -1) {
+    return -1;
+  }
+
+  make_socket_nonblocking(fd);
+  make_socket_closeonexec(fd);
+#endif // !SOCK_NONBLOCK
+
+  return fd;
+}
+
+int bind_any_addr_udp(int fd, int family) {
+  addrinfo hints{};
+  addrinfo *res, *rp;
+  int rv;
+
+  hints.ai_family = family;
+  hints.ai_socktype = SOCK_DGRAM;
+  hints.ai_flags = AI_PASSIVE;
+
+  rv = getaddrinfo(nullptr, "0", &hints, &res);
+  if (rv != 0) {
+    return -1;
+  }
+
+  for (rp = res; rp; rp = rp->ai_next) {
+    if (bind(fd, rp->ai_addr, rp->ai_addrlen) != -1) {
+      break;
+    }
+  }
+
+  freeaddrinfo(res);
+
+  if (!rp) {
+    return -1;
+  }
+
+  return 0;
+}
+
 bool check_socket_connected(int fd) {
   int error;
   socklen_t len = sizeof(error);
@@ -1617,6 +1670,40 @@ int daemonize(int nochdir, int noclose) {
 #endif // !defined(__APPLE__)
 }
 
+int msghdr_get_local_addr(Address &dest, msghdr *msg, int family) {
+  switch (family) {
+  case AF_INET:
+    for (auto cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+      if (cmsg->cmsg_level == IPPROTO_IP && cmsg->cmsg_type == IP_PKTINFO) {
+        auto pktinfo = reinterpret_cast<in_pktinfo *>(CMSG_DATA(cmsg));
+        dest.len = sizeof(dest.su.in);
+        auto &sa = dest.su.in;
+        sa.sin_family = AF_INET;
+        sa.sin_addr = pktinfo->ipi_addr;
+
+        return 0;
+      }
+    }
+
+    return -1;
+  case AF_INET6:
+    for (auto cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+      if (cmsg->cmsg_level == IPPROTO_IPV6 && cmsg->cmsg_type == IPV6_PKTINFO) {
+        auto pktinfo = reinterpret_cast<in6_pktinfo *>(CMSG_DATA(cmsg));
+        dest.len = sizeof(dest.su.in6);
+        auto &sa = dest.su.in6;
+        sa.sin6_family = AF_INET6;
+        sa.sin6_addr = pktinfo->ipi6_addr;
+        return 0;
+      }
+    }
+
+    return -1;
+  }
+
+  return -1;
+}
+
 } // namespace util
 
 } // namespace nghttp2

src/util.h

@@ -505,6 +505,8 @@ std::string numeric_name(const struct sockaddr *sa, socklen_t salen);
 // IPv6 address, address is enclosed by square brackets ([]).
 std::string to_numeric_addr(const Address *addr);
 
+std::string to_numeric_addr(const struct sockaddr *sa, socklen_t salen);
+
 // Sets |port| to |addr|.
 void set_port(Address &addr, uint16_t port);
 
@@ -626,6 +628,9 @@ int make_socket_nonblocking(int fd);
 int make_socket_nodelay(int fd);
 
 int create_nonblock_socket(int family);
+int create_nonblock_udp_socket(int family);
+
+int bind_any_addr_udp(int fd, int family);
 
 bool check_socket_connected(int fd);
 
@@ -783,6 +788,8 @@ std::mt19937 make_mt19937();
 // daemon() using fork().
 int daemonize(int nochdir, int noclose);
 
+int msghdr_get_local_addr(Address &dest, msghdr *msg, int family);
+
 } // namespace util
 
 } // namespace nghttp2