Adding upstream version 1.52.0.upstream/1.52.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 900 insertions, 0 deletions

diff --git a/lib/nghttp2_submit.c b/lib/nghttp2_submit.c
new file mode 100644
index 0000000..f5554eb
--- /dev/null
+++ b/lib/nghttp2_submit.c
@@ -0,0 +1,900 @@
+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012, 2013 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 "nghttp2_submit.h"
+
+#include <string.h>
+#include <assert.h>
+
+#include "nghttp2_session.h"
+#include "nghttp2_frame.h"
+#include "nghttp2_helper.h"
+#include "nghttp2_priority_spec.h"
+
+/*
+ * Detects the dependency error, that is stream attempted to depend on
+ * itself.  If |stream_id| is -1, we use session->next_stream_id as
+ * stream ID.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * error codes:
+ *
+ * NGHTTP2_ERR_INVALID_ARGUMENT
+ *   Stream attempted to depend on itself.
+ */
+static int detect_self_dependency(nghttp2_session *session, int32_t stream_id,
+                                  const nghttp2_priority_spec *pri_spec) {
+  assert(pri_spec);
+
+  if (stream_id == -1) {
+    if ((int32_t)session->next_stream_id == pri_spec->stream_id) {
+      return NGHTTP2_ERR_INVALID_ARGUMENT;
+    }
+    return 0;
+  }
+
+  if (stream_id == pri_spec->stream_id) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  return 0;
+}
+
+/* This function takes ownership of |nva_copy|. Regardless of the
+   return value, the caller must not free |nva_copy| after this
+   function returns. */
+static int32_t submit_headers_shared(nghttp2_session *session, uint8_t flags,
+                                     int32_t stream_id,
+                                     const nghttp2_priority_spec *pri_spec,
+                                     nghttp2_nv *nva_copy, size_t nvlen,
+                                     const nghttp2_data_provider *data_prd,
+                                     void *stream_user_data) {
+  int rv;
+  uint8_t flags_copy;
+  nghttp2_outbound_item *item = NULL;
+  nghttp2_frame *frame = NULL;
+  nghttp2_headers_category hcat;
+  nghttp2_mem *mem;
+
+  mem = &session->mem;
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    rv = NGHTTP2_ERR_NOMEM;
+    goto fail;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  if (data_prd != NULL && data_prd->read_callback != NULL) {
+    item->aux_data.headers.data_prd = *data_prd;
+  }
+
+  item->aux_data.headers.stream_user_data = stream_user_data;
+
+  flags_copy =
+      (uint8_t)((flags & (NGHTTP2_FLAG_END_STREAM | NGHTTP2_FLAG_PRIORITY)) |
+                NGHTTP2_FLAG_END_HEADERS);
+
+  if (stream_id == -1) {
+    if (session->next_stream_id > INT32_MAX) {
+      rv = NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE;
+      goto fail;
+    }
+
+    stream_id = (int32_t)session->next_stream_id;
+    session->next_stream_id += 2;
+
+    hcat = NGHTTP2_HCAT_REQUEST;
+  } else {
+    /* More specific categorization will be done later. */
+    hcat = NGHTTP2_HCAT_HEADERS;
+  }
+
+  frame = &item->frame;
+
+  nghttp2_frame_headers_init(&frame->headers, flags_copy, stream_id, hcat,
+                             pri_spec, nva_copy, nvlen);
+
+  rv = nghttp2_session_add_item(session, item);
+
+  if (rv != 0) {
+    nghttp2_frame_headers_free(&frame->headers, mem);
+    goto fail2;
+  }
+
+  if (hcat == NGHTTP2_HCAT_REQUEST) {
+    return stream_id;
+  }
+
+  return 0;
+
+fail:
+  /* nghttp2_frame_headers_init() takes ownership of nva_copy. */
+  nghttp2_nv_array_del(nva_copy, mem);
+fail2:
+  nghttp2_mem_free(mem, item);
+
+  return rv;
+}
+
+static int32_t submit_headers_shared_nva(nghttp2_session *session,
+                                         uint8_t flags, int32_t stream_id,
+                                         const nghttp2_priority_spec *pri_spec,
+                                         const nghttp2_nv *nva, size_t nvlen,
+                                         const nghttp2_data_provider *data_prd,
+                                         void *stream_user_data) {
+  int rv;
+  nghttp2_nv *nva_copy;
+  nghttp2_priority_spec copy_pri_spec;
+  nghttp2_mem *mem;
+
+  mem = &session->mem;
+
+  if (pri_spec) {
+    copy_pri_spec = *pri_spec;
+    nghttp2_priority_spec_normalize_weight(&copy_pri_spec);
+  } else {
+    nghttp2_priority_spec_default_init(&copy_pri_spec);
+  }
+
+  rv = nghttp2_nv_array_copy(&nva_copy, nva, nvlen, mem);
+  if (rv < 0) {
+    return rv;
+  }
+
+  return submit_headers_shared(session, flags, stream_id, &copy_pri_spec,
+                               nva_copy, nvlen, data_prd, stream_user_data);
+}
+
+int nghttp2_submit_trailer(nghttp2_session *session, int32_t stream_id,
+                           const nghttp2_nv *nva, size_t nvlen) {
+  if (stream_id <= 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  return (int)submit_headers_shared_nva(session, NGHTTP2_FLAG_END_STREAM,
+                                        stream_id, NULL, nva, nvlen, NULL,
+                                        NULL);
+}
+
+int32_t nghttp2_submit_headers(nghttp2_session *session, uint8_t flags,
+                               int32_t stream_id,
+                               const nghttp2_priority_spec *pri_spec,
+                               const nghttp2_nv *nva, size_t nvlen,
+                               void *stream_user_data) {
+  int rv;
+
+  if (stream_id == -1) {
+    if (session->server) {
+      return NGHTTP2_ERR_PROTO;
+    }
+  } else if (stream_id <= 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  flags &= NGHTTP2_FLAG_END_STREAM;
+
+  if (pri_spec && !nghttp2_priority_spec_check_default(pri_spec) &&
+      session->remote_settings.no_rfc7540_priorities != 1) {
+    rv = detect_self_dependency(session, stream_id, pri_spec);
+    if (rv != 0) {
+      return rv;
+    }
+
+    flags |= NGHTTP2_FLAG_PRIORITY;
+  } else {
+    pri_spec = NULL;
+  }
+
+  return submit_headers_shared_nva(session, flags, stream_id, pri_spec, nva,
+                                   nvlen, NULL, stream_user_data);
+}
+
+int nghttp2_submit_ping(nghttp2_session *session, uint8_t flags,
+                        const uint8_t *opaque_data) {
+  flags &= NGHTTP2_FLAG_ACK;
+  return nghttp2_session_add_ping(session, flags, opaque_data);
+}
+
+int nghttp2_submit_priority(nghttp2_session *session, uint8_t flags,
+                            int32_t stream_id,
+                            const nghttp2_priority_spec *pri_spec) {
+  int rv;
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_priority_spec copy_pri_spec;
+  nghttp2_mem *mem;
+  (void)flags;
+
+  mem = &session->mem;
+
+  if (session->remote_settings.no_rfc7540_priorities == 1) {
+    return 0;
+  }
+
+  if (stream_id == 0 || pri_spec == NULL) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (stream_id == pri_spec->stream_id) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  copy_pri_spec = *pri_spec;
+
+  nghttp2_priority_spec_normalize_weight(&copy_pri_spec);
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+
+  if (item == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  frame = &item->frame;
+
+  nghttp2_frame_priority_init(&frame->priority, stream_id, &copy_pri_spec);
+
+  rv = nghttp2_session_add_item(session, item);
+
+  if (rv != 0) {
+    nghttp2_frame_priority_free(&frame->priority);
+    nghttp2_mem_free(mem, item);
+
+    return rv;
+  }
+
+  return 0;
+}
+
+int nghttp2_submit_rst_stream(nghttp2_session *session, uint8_t flags,
+                              int32_t stream_id, uint32_t error_code) {
+  (void)flags;
+
+  if (stream_id == 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  return nghttp2_session_add_rst_stream(session, stream_id, error_code);
+}
+
+int nghttp2_submit_goaway(nghttp2_session *session, uint8_t flags,
+                          int32_t last_stream_id, uint32_t error_code,
+                          const uint8_t *opaque_data, size_t opaque_data_len) {
+  (void)flags;
+
+  if (session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND) {
+    return 0;
+  }
+  return nghttp2_session_add_goaway(session, last_stream_id, error_code,
+                                    opaque_data, opaque_data_len,
+                                    NGHTTP2_GOAWAY_AUX_NONE);
+}
+
+int nghttp2_submit_shutdown_notice(nghttp2_session *session) {
+  if (!session->server) {
+    return NGHTTP2_ERR_INVALID_STATE;
+  }
+  if (session->goaway_flags) {
+    return 0;
+  }
+  return nghttp2_session_add_goaway(session, (1u << 31) - 1, NGHTTP2_NO_ERROR,
+                                    NULL, 0,
+                                    NGHTTP2_GOAWAY_AUX_SHUTDOWN_NOTICE);
+}
+
+int nghttp2_submit_settings(nghttp2_session *session, uint8_t flags,
+                            const nghttp2_settings_entry *iv, size_t niv) {
+  (void)flags;
+  return nghttp2_session_add_settings(session, NGHTTP2_FLAG_NONE, iv, niv);
+}
+
+int32_t nghttp2_submit_push_promise(nghttp2_session *session, uint8_t flags,
+                                    int32_t stream_id, const nghttp2_nv *nva,
+                                    size_t nvlen,
+                                    void *promised_stream_user_data) {
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_nv *nva_copy;
+  uint8_t flags_copy;
+  int32_t promised_stream_id;
+  int rv;
+  nghttp2_mem *mem;
+  (void)flags;
+
+  mem = &session->mem;
+
+  if (stream_id <= 0 || nghttp2_session_is_my_stream_id(session, stream_id)) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (!session->server) {
+    return NGHTTP2_ERR_PROTO;
+  }
+
+  /* All 32bit signed stream IDs are spent. */
+  if (session->next_stream_id > INT32_MAX) {
+    return NGHTTP2_ERR_STREAM_ID_NOT_AVAILABLE;
+  }
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  item->aux_data.headers.stream_user_data = promised_stream_user_data;
+
+  frame = &item->frame;
+
+  rv = nghttp2_nv_array_copy(&nva_copy, nva, nvlen, mem);
+  if (rv < 0) {
+    nghttp2_mem_free(mem, item);
+    return rv;
+  }
+
+  flags_copy = NGHTTP2_FLAG_END_HEADERS;
+
+  promised_stream_id = (int32_t)session->next_stream_id;
+  session->next_stream_id += 2;
+
+  nghttp2_frame_push_promise_init(&frame->push_promise, flags_copy, stream_id,
+                                  promised_stream_id, nva_copy, nvlen);
+
+  rv = nghttp2_session_add_item(session, item);
+
+  if (rv != 0) {
+    nghttp2_frame_push_promise_free(&frame->push_promise, mem);
+    nghttp2_mem_free(mem, item);
+
+    return rv;
+  }
+
+  return promised_stream_id;
+}
+
+int nghttp2_submit_window_update(nghttp2_session *session, uint8_t flags,
+                                 int32_t stream_id,
+                                 int32_t window_size_increment) {
+  int rv;
+  nghttp2_stream *stream = 0;
+  (void)flags;
+
+  if (window_size_increment == 0) {
+    return 0;
+  }
+  if (stream_id == 0) {
+    rv = nghttp2_adjust_local_window_size(
+        &session->local_window_size, &session->recv_window_size,
+        &session->recv_reduction, &window_size_increment);
+    if (rv != 0) {
+      return rv;
+    }
+  } else {
+    stream = nghttp2_session_get_stream(session, stream_id);
+    if (!stream) {
+      return 0;
+    }
+
+    rv = nghttp2_adjust_local_window_size(
+        &stream->local_window_size, &stream->recv_window_size,
+        &stream->recv_reduction, &window_size_increment);
+    if (rv != 0) {
+      return rv;
+    }
+  }
+
+  if (window_size_increment > 0) {
+    if (stream_id == 0) {
+      session->consumed_size =
+          nghttp2_max(0, session->consumed_size - window_size_increment);
+    } else {
+      stream->consumed_size =
+          nghttp2_max(0, stream->consumed_size - window_size_increment);
+    }
+
+    return nghttp2_session_add_window_update(session, 0, stream_id,
+                                             window_size_increment);
+  }
+  return 0;
+}
+
+int nghttp2_session_set_local_window_size(nghttp2_session *session,
+                                          uint8_t flags, int32_t stream_id,
+                                          int32_t window_size) {
+  int32_t window_size_increment;
+  nghttp2_stream *stream;
+  int rv;
+  (void)flags;
+
+  if (window_size < 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (stream_id == 0) {
+    window_size_increment = window_size - session->local_window_size;
+
+    if (window_size_increment == 0) {
+      return 0;
+    }
+
+    if (window_size_increment < 0) {
+      return nghttp2_adjust_local_window_size(
+          &session->local_window_size, &session->recv_window_size,
+          &session->recv_reduction, &window_size_increment);
+    }
+
+    rv = nghttp2_increase_local_window_size(
+        &session->local_window_size, &session->recv_window_size,
+        &session->recv_reduction, &window_size_increment);
+
+    if (rv != 0) {
+      return rv;
+    }
+
+    if (window_size_increment > 0) {
+      return nghttp2_session_add_window_update(session, 0, stream_id,
+                                               window_size_increment);
+    }
+
+    return nghttp2_session_update_recv_connection_window_size(session, 0);
+  } else {
+    stream = nghttp2_session_get_stream(session, stream_id);
+
+    if (stream == NULL) {
+      return 0;
+    }
+
+    window_size_increment = window_size - stream->local_window_size;
+
+    if (window_size_increment == 0) {
+      return 0;
+    }
+
+    if (window_size_increment < 0) {
+      return nghttp2_adjust_local_window_size(
+          &stream->local_window_size, &stream->recv_window_size,
+          &stream->recv_reduction, &window_size_increment);
+    }
+
+    rv = nghttp2_increase_local_window_size(
+        &stream->local_window_size, &stream->recv_window_size,
+        &stream->recv_reduction, &window_size_increment);
+
+    if (rv != 0) {
+      return rv;
+    }
+
+    if (window_size_increment > 0) {
+      return nghttp2_session_add_window_update(session, 0, stream_id,
+                                               window_size_increment);
+    }
+
+    return nghttp2_session_update_recv_stream_window_size(session, stream, 0,
+                                                          1);
+  }
+}
+
+int nghttp2_submit_altsvc(nghttp2_session *session, uint8_t flags,
+                          int32_t stream_id, const uint8_t *origin,
+                          size_t origin_len, const uint8_t *field_value,
+                          size_t field_value_len) {
+  nghttp2_mem *mem;
+  uint8_t *buf, *p;
+  uint8_t *origin_copy;
+  uint8_t *field_value_copy;
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_ext_altsvc *altsvc;
+  int rv;
+  (void)flags;
+
+  mem = &session->mem;
+
+  if (!session->server) {
+    return NGHTTP2_ERR_INVALID_STATE;
+  }
+
+  if (2 + origin_len + field_value_len > NGHTTP2_MAX_PAYLOADLEN) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (stream_id == 0) {
+    if (origin_len == 0) {
+      return NGHTTP2_ERR_INVALID_ARGUMENT;
+    }
+  } else if (origin_len != 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  buf = nghttp2_mem_malloc(mem, origin_len + field_value_len + 2);
+  if (buf == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  p = buf;
+
+  origin_copy = p;
+  if (origin_len) {
+    p = nghttp2_cpymem(p, origin, origin_len);
+  }
+  *p++ = '\0';
+
+  field_value_copy = p;
+  if (field_value_len) {
+    p = nghttp2_cpymem(p, field_value, field_value_len);
+  }
+  *p++ = '\0';
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    rv = NGHTTP2_ERR_NOMEM;
+    goto fail_item_malloc;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  item->aux_data.ext.builtin = 1;
+
+  altsvc = &item->ext_frame_payload.altsvc;
+
+  frame = &item->frame;
+  frame->ext.payload = altsvc;
+
+  nghttp2_frame_altsvc_init(&frame->ext, stream_id, origin_copy, origin_len,
+                            field_value_copy, field_value_len);
+
+  rv = nghttp2_session_add_item(session, item);
+  if (rv != 0) {
+    nghttp2_frame_altsvc_free(&frame->ext, mem);
+    nghttp2_mem_free(mem, item);
+
+    return rv;
+  }
+
+  return 0;
+
+fail_item_malloc:
+  free(buf);
+
+  return rv;
+}
+
+int nghttp2_submit_origin(nghttp2_session *session, uint8_t flags,
+                          const nghttp2_origin_entry *ov, size_t nov) {
+  nghttp2_mem *mem;
+  uint8_t *p;
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_ext_origin *origin;
+  nghttp2_origin_entry *ov_copy;
+  size_t len = 0;
+  size_t i;
+  int rv;
+  (void)flags;
+
+  mem = &session->mem;
+
+  if (!session->server) {
+    return NGHTTP2_ERR_INVALID_STATE;
+  }
+
+  if (nov) {
+    for (i = 0; i < nov; ++i) {
+      len += ov[i].origin_len;
+    }
+
+    if (2 * nov + len > NGHTTP2_MAX_PAYLOADLEN) {
+      return NGHTTP2_ERR_INVALID_ARGUMENT;
+    }
+
+    /* The last nov is added for terminal NULL character. */
+    ov_copy =
+        nghttp2_mem_malloc(mem, nov * sizeof(nghttp2_origin_entry) + len + nov);
+    if (ov_copy == NULL) {
+      return NGHTTP2_ERR_NOMEM;
+    }
+
+    p = (uint8_t *)ov_copy + nov * sizeof(nghttp2_origin_entry);
+
+    for (i = 0; i < nov; ++i) {
+      ov_copy[i].origin = p;
+      ov_copy[i].origin_len = ov[i].origin_len;
+      p = nghttp2_cpymem(p, ov[i].origin, ov[i].origin_len);
+      *p++ = '\0';
+    }
+
+    assert((size_t)(p - (uint8_t *)ov_copy) ==
+           nov * sizeof(nghttp2_origin_entry) + len + nov);
+  } else {
+    ov_copy = NULL;
+  }
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    rv = NGHTTP2_ERR_NOMEM;
+    goto fail_item_malloc;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  item->aux_data.ext.builtin = 1;
+
+  origin = &item->ext_frame_payload.origin;
+
+  frame = &item->frame;
+  frame->ext.payload = origin;
+
+  nghttp2_frame_origin_init(&frame->ext, ov_copy, nov);
+
+  rv = nghttp2_session_add_item(session, item);
+  if (rv != 0) {
+    nghttp2_frame_origin_free(&frame->ext, mem);
+    nghttp2_mem_free(mem, item);
+
+    return rv;
+  }
+
+  return 0;
+
+fail_item_malloc:
+  free(ov_copy);
+
+  return rv;
+}
+
+int nghttp2_submit_priority_update(nghttp2_session *session, uint8_t flags,
+                                   int32_t stream_id,
+                                   const uint8_t *field_value,
+                                   size_t field_value_len) {
+  nghttp2_mem *mem;
+  uint8_t *buf, *p;
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_ext_priority_update *priority_update;
+  int rv;
+  (void)flags;
+
+  mem = &session->mem;
+
+  if (session->server) {
+    return NGHTTP2_ERR_INVALID_STATE;
+  }
+
+  if (session->remote_settings.no_rfc7540_priorities == 0) {
+    return 0;
+  }
+
+  if (stream_id == 0 || 4 + field_value_len > NGHTTP2_MAX_PAYLOADLEN) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (field_value_len) {
+    buf = nghttp2_mem_malloc(mem, field_value_len + 1);
+    if (buf == NULL) {
+      return NGHTTP2_ERR_NOMEM;
+    }
+
+    p = nghttp2_cpymem(buf, field_value, field_value_len);
+    *p = '\0';
+  } else {
+    buf = NULL;
+  }
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    rv = NGHTTP2_ERR_NOMEM;
+    goto fail_item_malloc;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  item->aux_data.ext.builtin = 1;
+
+  priority_update = &item->ext_frame_payload.priority_update;
+
+  frame = &item->frame;
+  frame->ext.payload = priority_update;
+
+  nghttp2_frame_priority_update_init(&frame->ext, stream_id, buf,
+                                     field_value_len);
+
+  rv = nghttp2_session_add_item(session, item);
+  if (rv != 0) {
+    nghttp2_frame_priority_update_free(&frame->ext, mem);
+    nghttp2_mem_free(mem, item);
+
+    return rv;
+  }
+
+  return 0;
+
+fail_item_malloc:
+  free(buf);
+
+  return rv;
+}
+
+static uint8_t set_request_flags(const nghttp2_priority_spec *pri_spec,
+                                 const nghttp2_data_provider *data_prd) {
+  uint8_t flags = NGHTTP2_FLAG_NONE;
+  if (data_prd == NULL || data_prd->read_callback == NULL) {
+    flags |= NGHTTP2_FLAG_END_STREAM;
+  }
+
+  if (pri_spec) {
+    flags |= NGHTTP2_FLAG_PRIORITY;
+  }
+
+  return flags;
+}
+
+int32_t nghttp2_submit_request(nghttp2_session *session,
+                               const nghttp2_priority_spec *pri_spec,
+                               const nghttp2_nv *nva, size_t nvlen,
+                               const nghttp2_data_provider *data_prd,
+                               void *stream_user_data) {
+  uint8_t flags;
+  int rv;
+
+  if (session->server) {
+    return NGHTTP2_ERR_PROTO;
+  }
+
+  if (pri_spec && !nghttp2_priority_spec_check_default(pri_spec) &&
+      session->remote_settings.no_rfc7540_priorities != 1) {
+    rv = detect_self_dependency(session, -1, pri_spec);
+    if (rv != 0) {
+      return rv;
+    }
+  } else {
+    pri_spec = NULL;
+  }
+
+  flags = set_request_flags(pri_spec, data_prd);
+
+  return submit_headers_shared_nva(session, flags, -1, pri_spec, nva, nvlen,
+                                   data_prd, stream_user_data);
+}
+
+static uint8_t set_response_flags(const nghttp2_data_provider *data_prd) {
+  uint8_t flags = NGHTTP2_FLAG_NONE;
+  if (data_prd == NULL || data_prd->read_callback == NULL) {
+    flags |= NGHTTP2_FLAG_END_STREAM;
+  }
+  return flags;
+}
+
+int nghttp2_submit_response(nghttp2_session *session, int32_t stream_id,
+                            const nghttp2_nv *nva, size_t nvlen,
+                            const nghttp2_data_provider *data_prd) {
+  uint8_t flags;
+
+  if (stream_id <= 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (!session->server) {
+    return NGHTTP2_ERR_PROTO;
+  }
+
+  flags = set_response_flags(data_prd);
+  return submit_headers_shared_nva(session, flags, stream_id, NULL, nva, nvlen,
+                                   data_prd, NULL);
+}
+
+int nghttp2_submit_data(nghttp2_session *session, uint8_t flags,
+                        int32_t stream_id,
+                        const nghttp2_data_provider *data_prd) {
+  int rv;
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_data_aux_data *aux_data;
+  uint8_t nflags = flags & NGHTTP2_FLAG_END_STREAM;
+  nghttp2_mem *mem;
+
+  mem = &session->mem;
+
+  if (stream_id == 0) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  frame = &item->frame;
+  aux_data = &item->aux_data.data;
+  aux_data->data_prd = *data_prd;
+  aux_data->eof = 0;
+  aux_data->flags = nflags;
+
+  /* flags are sent on transmission */
+  nghttp2_frame_data_init(&frame->data, NGHTTP2_FLAG_NONE, stream_id);
+
+  rv = nghttp2_session_add_item(session, item);
+  if (rv != 0) {
+    nghttp2_frame_data_free(&frame->data);
+    nghttp2_mem_free(mem, item);
+    return rv;
+  }
+  return 0;
+}
+
+ssize_t nghttp2_pack_settings_payload(uint8_t *buf, size_t buflen,
+                                      const nghttp2_settings_entry *iv,
+                                      size_t niv) {
+  if (!nghttp2_iv_check(iv, niv)) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (buflen < (niv * NGHTTP2_FRAME_SETTINGS_ENTRY_LENGTH)) {
+    return NGHTTP2_ERR_INSUFF_BUFSIZE;
+  }
+
+  return (ssize_t)nghttp2_frame_pack_settings_payload(buf, iv, niv);
+}
+
+int nghttp2_submit_extension(nghttp2_session *session, uint8_t type,
+                             uint8_t flags, int32_t stream_id, void *payload) {
+  int rv;
+  nghttp2_outbound_item *item;
+  nghttp2_frame *frame;
+  nghttp2_mem *mem;
+
+  mem = &session->mem;
+
+  if (type <= NGHTTP2_CONTINUATION) {
+    return NGHTTP2_ERR_INVALID_ARGUMENT;
+  }
+
+  if (!session->callbacks.pack_extension_callback) {
+    return NGHTTP2_ERR_INVALID_STATE;
+  }
+
+  item = nghttp2_mem_malloc(mem, sizeof(nghttp2_outbound_item));
+  if (item == NULL) {
+    return NGHTTP2_ERR_NOMEM;
+  }
+
+  nghttp2_outbound_item_init(item);
+
+  frame = &item->frame;
+  nghttp2_frame_extension_init(&frame->ext, type, flags, stream_id, payload);
+
+  rv = nghttp2_session_add_item(session, item);
+  if (rv != 0) {
+    nghttp2_frame_extension_free(&frame->ext);
+    nghttp2_mem_free(mem, item);
+    return rv;
+  }
+
+  return 0;
+}