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nghttp2_session.c
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nghttp2_session.c
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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 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_session.h"
#include <string.h>
#include <stddef.h>
#include <stdio.h>
#include <assert.h>
#include <stdarg.h>
#include "nghttp2_helper.h"
#include "nghttp2_net.h"
#include "nghttp2_priority_spec.h"
#include "nghttp2_option.h"
#include "nghttp2_http.h"
#include "nghttp2_pq.h"
#include "nghttp2_extpri.h"
#include "nghttp2_time.h"
#include "nghttp2_debug.h"
#include "nghttp2_submit.h"
/*
* Returns non-zero if the number of outgoing opened streams is larger
* than or equal to
* remote_settings.max_concurrent_streams.
*/
static int
session_is_outgoing_concurrent_streams_max(nghttp2_session *session) {
return session->remote_settings.max_concurrent_streams <=
session->num_outgoing_streams;
}
/*
* Returns non-zero if the number of incoming opened streams is larger
* than or equal to
* local_settings.max_concurrent_streams.
*/
static int
session_is_incoming_concurrent_streams_max(nghttp2_session *session) {
return session->local_settings.max_concurrent_streams <=
session->num_incoming_streams;
}
/*
* Returns non-zero if the number of incoming opened streams is larger
* than or equal to
* session->pending_local_max_concurrent_stream.
*/
static int
session_is_incoming_concurrent_streams_pending_max(nghttp2_session *session) {
return session->pending_local_max_concurrent_stream <=
session->num_incoming_streams;
}
/*
* Returns non-zero if |lib_error| is non-fatal error.
*/
static int is_non_fatal(int lib_error_code) {
return lib_error_code < 0 && lib_error_code > NGHTTP2_ERR_FATAL;
}
int nghttp2_is_fatal(int lib_error_code) {
return lib_error_code < NGHTTP2_ERR_FATAL;
}
static int session_enforce_http_messaging(nghttp2_session *session) {
return (session->opt_flags & NGHTTP2_OPTMASK_NO_HTTP_MESSAGING) == 0;
}
/*
* Returns nonzero if |frame| is trailer headers.
*/
static int session_trailer_headers(nghttp2_session *session,
nghttp2_stream *stream,
nghttp2_frame *frame) {
if (!stream || frame->hd.type != NGHTTP2_HEADERS) {
return 0;
}
if (session->server) {
return frame->headers.cat == NGHTTP2_HCAT_HEADERS;
}
return frame->headers.cat == NGHTTP2_HCAT_HEADERS &&
(stream->http_flags & NGHTTP2_HTTP_FLAG_EXPECT_FINAL_RESPONSE) == 0;
}
/* Returns nonzero if the |stream| is in reserved(remote) state */
static int state_reserved_remote(nghttp2_session *session,
nghttp2_stream *stream) {
return stream->state == NGHTTP2_STREAM_RESERVED &&
!nghttp2_session_is_my_stream_id(session, stream->stream_id);
}
/* Returns nonzero if the |stream| is in reserved(local) state */
static int state_reserved_local(nghttp2_session *session,
nghttp2_stream *stream) {
return stream->state == NGHTTP2_STREAM_RESERVED &&
nghttp2_session_is_my_stream_id(session, stream->stream_id);
}
/*
* Checks whether received stream_id is valid. This function returns
* 1 if it succeeds, or 0.
*/
static int session_is_new_peer_stream_id(nghttp2_session *session,
int32_t stream_id) {
return stream_id != 0 &&
!nghttp2_session_is_my_stream_id(session, stream_id) &&
session->last_recv_stream_id < stream_id;
}
static int session_detect_idle_stream(nghttp2_session *session,
int32_t stream_id) {
/* Assume that stream object with stream_id does not exist */
if (nghttp2_session_is_my_stream_id(session, stream_id)) {
if (session->last_sent_stream_id < stream_id) {
return 1;
}
return 0;
}
if (session_is_new_peer_stream_id(session, stream_id)) {
return 1;
}
return 0;
}
static int session_no_rfc7540_pri_no_fallback(nghttp2_session *session) {
return session->pending_no_rfc7540_priorities == 1 &&
!session->fallback_rfc7540_priorities;
}
static int check_ext_type_set(const uint8_t *ext_types, uint8_t type) {
return (ext_types[type / 8] & (1 << (type & 0x7))) > 0;
}
static int session_call_error_callback(nghttp2_session *session,
int lib_error_code, const char *fmt,
...) {
size_t bufsize;
va_list ap;
char *buf;
int rv;
nghttp2_mem *mem;
if (!session->callbacks.error_callback &&
!session->callbacks.error_callback2) {
return 0;
}
mem = &session->mem;
va_start(ap, fmt);
rv = vsnprintf(NULL, 0, fmt, ap);
va_end(ap);
if (rv < 0) {
return NGHTTP2_ERR_NOMEM;
}
bufsize = (size_t)(rv + 1);
buf = nghttp2_mem_malloc(mem, bufsize);
if (buf == NULL) {
return NGHTTP2_ERR_NOMEM;
}
va_start(ap, fmt);
rv = vsnprintf(buf, bufsize, fmt, ap);
va_end(ap);
if (rv < 0) {
nghttp2_mem_free(mem, buf);
/* vsnprintf may return error because of various things we can
imagine, but typically we don't want to drop session just for
debug callback. */
DEBUGF("error_callback: vsnprintf failed. The template was %s\n", fmt);
return 0;
}
if (session->callbacks.error_callback2) {
rv = session->callbacks.error_callback2(session, lib_error_code, buf,
(size_t)rv, session->user_data);
} else {
rv = session->callbacks.error_callback(session, buf, (size_t)rv,
session->user_data);
}
nghttp2_mem_free(mem, buf);
if (rv != 0) {
return NGHTTP2_ERR_CALLBACK_FAILURE;
}
return 0;
}
static int session_terminate_session(nghttp2_session *session,
int32_t last_stream_id,
uint32_t error_code, const char *reason) {
int rv;
const uint8_t *debug_data;
size_t debug_datalen;
if (session->goaway_flags & NGHTTP2_GOAWAY_TERM_ON_SEND) {
return 0;
}
/* Ignore all incoming frames because we are going to tear down the
session. */
session->iframe.state = NGHTTP2_IB_IGN_ALL;
if (reason == NULL) {
debug_data = NULL;
debug_datalen = 0;
} else {
debug_data = (const uint8_t *)reason;
debug_datalen = strlen(reason);
}
rv = nghttp2_session_add_goaway(session, last_stream_id, error_code,
debug_data, debug_datalen,
NGHTTP2_GOAWAY_AUX_TERM_ON_SEND);
if (rv != 0) {
return rv;
}
session->goaway_flags |= NGHTTP2_GOAWAY_TERM_ON_SEND;
return 0;
}
int nghttp2_session_terminate_session(nghttp2_session *session,
uint32_t error_code) {
return session_terminate_session(session, session->last_proc_stream_id,
error_code, NULL);
}
int nghttp2_session_terminate_session2(nghttp2_session *session,
int32_t last_stream_id,
uint32_t error_code) {
return session_terminate_session(session, last_stream_id, error_code, NULL);
}
int nghttp2_session_terminate_session_with_reason(nghttp2_session *session,
uint32_t error_code,
const char *reason) {
return session_terminate_session(session, session->last_proc_stream_id,
error_code, reason);
}
int nghttp2_session_is_my_stream_id(nghttp2_session *session,
int32_t stream_id) {
int rem;
if (stream_id == 0) {
return 0;
}
rem = stream_id & 0x1;
if (session->server) {
return rem == 0;
}
return rem == 1;
}
nghttp2_stream *nghttp2_session_get_stream(nghttp2_session *session,
int32_t stream_id) {
nghttp2_stream *stream;
stream = (nghttp2_stream *)nghttp2_map_find(&session->streams, stream_id);
if (stream == NULL || (stream->flags & NGHTTP2_STREAM_FLAG_CLOSED) ||
stream->state == NGHTTP2_STREAM_IDLE) {
return NULL;
}
return stream;
}
nghttp2_stream *nghttp2_session_get_stream_raw(nghttp2_session *session,
int32_t stream_id) {
return (nghttp2_stream *)nghttp2_map_find(&session->streams, stream_id);
}
static void session_inbound_frame_reset(nghttp2_session *session) {
nghttp2_inbound_frame *iframe = &session->iframe;
nghttp2_mem *mem = &session->mem;
/* A bit risky code, since if this function is called from
nghttp2_session_new(), we rely on the fact that
iframe->frame.hd.type is 0, so that no free is performed. */
switch (iframe->frame.hd.type) {
case NGHTTP2_DATA:
break;
case NGHTTP2_HEADERS:
nghttp2_frame_headers_free(&iframe->frame.headers, mem);
break;
case NGHTTP2_PRIORITY:
nghttp2_frame_priority_free(&iframe->frame.priority);
break;
case NGHTTP2_RST_STREAM:
nghttp2_frame_rst_stream_free(&iframe->frame.rst_stream);
break;
case NGHTTP2_SETTINGS:
nghttp2_frame_settings_free(&iframe->frame.settings, mem);
nghttp2_mem_free(mem, iframe->iv);
iframe->iv = NULL;
iframe->niv = 0;
iframe->max_niv = 0;
break;
case NGHTTP2_PUSH_PROMISE:
nghttp2_frame_push_promise_free(&iframe->frame.push_promise, mem);
break;
case NGHTTP2_PING:
nghttp2_frame_ping_free(&iframe->frame.ping);
break;
case NGHTTP2_GOAWAY:
nghttp2_frame_goaway_free(&iframe->frame.goaway, mem);
break;
case NGHTTP2_WINDOW_UPDATE:
nghttp2_frame_window_update_free(&iframe->frame.window_update);
break;
default:
/* extension frame */
if (check_ext_type_set(session->user_recv_ext_types,
iframe->frame.hd.type)) {
nghttp2_frame_extension_free(&iframe->frame.ext);
} else {
switch (iframe->frame.hd.type) {
case NGHTTP2_ALTSVC:
if ((session->builtin_recv_ext_types & NGHTTP2_TYPEMASK_ALTSVC) == 0) {
break;
}
nghttp2_frame_altsvc_free(&iframe->frame.ext, mem);
break;
case NGHTTP2_ORIGIN:
if ((session->builtin_recv_ext_types & NGHTTP2_TYPEMASK_ORIGIN) == 0) {
break;
}
nghttp2_frame_origin_free(&iframe->frame.ext, mem);
break;
case NGHTTP2_PRIORITY_UPDATE:
if ((session->builtin_recv_ext_types &
NGHTTP2_TYPEMASK_PRIORITY_UPDATE) == 0) {
break;
}
/* Do not call nghttp2_frame_priority_update_free, because all
fields point to sbuf. */
break;
}
}
break;
}
memset(&iframe->frame, 0, sizeof(nghttp2_frame));
memset(&iframe->ext_frame_payload, 0, sizeof(nghttp2_ext_frame_payload));
iframe->state = NGHTTP2_IB_READ_HEAD;
nghttp2_buf_wrap_init(&iframe->sbuf, iframe->raw_sbuf,
sizeof(iframe->raw_sbuf));
iframe->sbuf.mark += NGHTTP2_FRAME_HDLEN;
nghttp2_buf_free(&iframe->lbuf, mem);
nghttp2_buf_wrap_init(&iframe->lbuf, NULL, 0);
iframe->raw_lbuf = NULL;
iframe->payloadleft = 0;
iframe->padlen = 0;
}
static void init_settings(nghttp2_settings_storage *settings) {
settings->header_table_size = NGHTTP2_HD_DEFAULT_MAX_BUFFER_SIZE;
settings->enable_push = 1;
settings->max_concurrent_streams = NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS;
settings->initial_window_size = NGHTTP2_INITIAL_WINDOW_SIZE;
settings->max_frame_size = NGHTTP2_MAX_FRAME_SIZE_MIN;
settings->max_header_list_size = UINT32_MAX;
settings->no_rfc7540_priorities = UINT32_MAX;
}
static void active_outbound_item_reset(nghttp2_active_outbound_item *aob,
nghttp2_mem *mem) {
DEBUGF("send: reset nghttp2_active_outbound_item\n");
DEBUGF("send: aob->item = %p\n", aob->item);
nghttp2_outbound_item_free(aob->item, mem);
nghttp2_mem_free(mem, aob->item);
aob->item = NULL;
nghttp2_bufs_reset(&aob->framebufs);
aob->state = NGHTTP2_OB_POP_ITEM;
}
#define NGHTTP2_STREAM_MAX_CYCLE_GAP ((uint64_t)NGHTTP2_MAX_FRAME_SIZE_MAX)
static int stream_less(const void *lhsx, const void *rhsx) {
const nghttp2_stream *lhs, *rhs;
lhs = nghttp2_struct_of(lhsx, nghttp2_stream, pq_entry);
rhs = nghttp2_struct_of(rhsx, nghttp2_stream, pq_entry);
if (lhs->cycle == rhs->cycle) {
return lhs->seq < rhs->seq;
}
return rhs->cycle - lhs->cycle <= NGHTTP2_STREAM_MAX_CYCLE_GAP;
}
int nghttp2_enable_strict_preface = 1;
static int session_new(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data, int server,
const nghttp2_option *option, nghttp2_mem *mem) {
int rv;
size_t nbuffer;
size_t max_deflate_dynamic_table_size =
NGHTTP2_HD_DEFAULT_MAX_DEFLATE_BUFFER_SIZE;
size_t i;
if (mem == NULL) {
mem = nghttp2_mem_default();
}
*session_ptr = nghttp2_mem_calloc(mem, 1, sizeof(nghttp2_session));
if (*session_ptr == NULL) {
rv = NGHTTP2_ERR_NOMEM;
goto fail_session;
}
(*session_ptr)->mem = *mem;
mem = &(*session_ptr)->mem;
/* next_stream_id is initialized in either
nghttp2_session_client_new2 or nghttp2_session_server_new2 */
nghttp2_stream_init(&(*session_ptr)->root, 0, NGHTTP2_STREAM_FLAG_NONE,
NGHTTP2_STREAM_IDLE, NGHTTP2_DEFAULT_WEIGHT, 0, 0, NULL,
mem);
(*session_ptr)->remote_window_size = NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE;
(*session_ptr)->recv_window_size = 0;
(*session_ptr)->consumed_size = 0;
(*session_ptr)->recv_reduction = 0;
(*session_ptr)->local_window_size = NGHTTP2_INITIAL_CONNECTION_WINDOW_SIZE;
(*session_ptr)->goaway_flags = NGHTTP2_GOAWAY_NONE;
(*session_ptr)->local_last_stream_id = (1u << 31) - 1;
(*session_ptr)->remote_last_stream_id = (1u << 31) - 1;
(*session_ptr)->pending_local_max_concurrent_stream =
NGHTTP2_DEFAULT_MAX_CONCURRENT_STREAMS;
(*session_ptr)->pending_enable_push = 1;
(*session_ptr)->pending_no_rfc7540_priorities = UINT8_MAX;
nghttp2_ratelim_init(&(*session_ptr)->stream_reset_ratelim,
NGHTTP2_DEFAULT_STREAM_RESET_BURST,
NGHTTP2_DEFAULT_STREAM_RESET_RATE);
if (server) {
(*session_ptr)->server = 1;
}
init_settings(&(*session_ptr)->remote_settings);
init_settings(&(*session_ptr)->local_settings);
(*session_ptr)->max_incoming_reserved_streams =
NGHTTP2_MAX_INCOMING_RESERVED_STREAMS;
/* Limit max outgoing concurrent streams to sensible value */
(*session_ptr)->remote_settings.max_concurrent_streams = 100;
(*session_ptr)->max_send_header_block_length = NGHTTP2_MAX_HEADERSLEN;
(*session_ptr)->max_outbound_ack = NGHTTP2_DEFAULT_MAX_OBQ_FLOOD_ITEM;
(*session_ptr)->max_settings = NGHTTP2_DEFAULT_MAX_SETTINGS;
(*session_ptr)->max_continuations = NGHTTP2_DEFAULT_MAX_CONTINUATIONS;
if (option) {
if ((option->opt_set_mask & NGHTTP2_OPT_NO_AUTO_WINDOW_UPDATE) &&
option->no_auto_window_update) {
(*session_ptr)->opt_flags |= NGHTTP2_OPTMASK_NO_AUTO_WINDOW_UPDATE;
}
if (option->opt_set_mask & NGHTTP2_OPT_PEER_MAX_CONCURRENT_STREAMS) {
(*session_ptr)->remote_settings.max_concurrent_streams =
option->peer_max_concurrent_streams;
}
if (option->opt_set_mask & NGHTTP2_OPT_MAX_RESERVED_REMOTE_STREAMS) {
(*session_ptr)->max_incoming_reserved_streams =
option->max_reserved_remote_streams;
}
if ((option->opt_set_mask & NGHTTP2_OPT_NO_RECV_CLIENT_MAGIC) &&
option->no_recv_client_magic) {
(*session_ptr)->opt_flags |= NGHTTP2_OPTMASK_NO_RECV_CLIENT_MAGIC;
}
if ((option->opt_set_mask & NGHTTP2_OPT_NO_HTTP_MESSAGING) &&
option->no_http_messaging) {
(*session_ptr)->opt_flags |= NGHTTP2_OPTMASK_NO_HTTP_MESSAGING;
}
if (option->opt_set_mask & NGHTTP2_OPT_USER_RECV_EXT_TYPES) {
memcpy((*session_ptr)->user_recv_ext_types, option->user_recv_ext_types,
sizeof((*session_ptr)->user_recv_ext_types));
}
if (option->opt_set_mask & NGHTTP2_OPT_BUILTIN_RECV_EXT_TYPES) {
(*session_ptr)->builtin_recv_ext_types = option->builtin_recv_ext_types;
}
if ((option->opt_set_mask & NGHTTP2_OPT_NO_AUTO_PING_ACK) &&
option->no_auto_ping_ack) {
(*session_ptr)->opt_flags |= NGHTTP2_OPTMASK_NO_AUTO_PING_ACK;
}
if (option->opt_set_mask & NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH) {
(*session_ptr)->max_send_header_block_length =
option->max_send_header_block_length;
}
if (option->opt_set_mask & NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE) {
max_deflate_dynamic_table_size = option->max_deflate_dynamic_table_size;
}
if ((option->opt_set_mask & NGHTTP2_OPT_NO_CLOSED_STREAMS) &&
option->no_closed_streams) {
(*session_ptr)->opt_flags |= NGHTTP2_OPTMASK_NO_CLOSED_STREAMS;
}
if (option->opt_set_mask & NGHTTP2_OPT_MAX_OUTBOUND_ACK) {
(*session_ptr)->max_outbound_ack = option->max_outbound_ack;
}
if ((option->opt_set_mask & NGHTTP2_OPT_MAX_SETTINGS) &&
option->max_settings) {
(*session_ptr)->max_settings = option->max_settings;
}
if ((option->opt_set_mask &
NGHTTP2_OPT_SERVER_FALLBACK_RFC7540_PRIORITIES) &&
option->server_fallback_rfc7540_priorities) {
(*session_ptr)->opt_flags |=
NGHTTP2_OPTMASK_SERVER_FALLBACK_RFC7540_PRIORITIES;
}
if ((option->opt_set_mask &
NGHTTP2_OPT_NO_RFC9113_LEADING_AND_TRAILING_WS_VALIDATION) &&
option->no_rfc9113_leading_and_trailing_ws_validation) {
(*session_ptr)->opt_flags |=
NGHTTP2_OPTMASK_NO_RFC9113_LEADING_AND_TRAILING_WS_VALIDATION;
}
if (option->opt_set_mask & NGHTTP2_OPT_STREAM_RESET_RATE_LIMIT) {
nghttp2_ratelim_init(&(*session_ptr)->stream_reset_ratelim,
option->stream_reset_burst,
option->stream_reset_rate);
}
if (option->opt_set_mask & NGHTTP2_OPT_MAX_CONTINUATIONS) {
(*session_ptr)->max_continuations = option->max_continuations;
}
}
rv = nghttp2_hd_deflate_init2(&(*session_ptr)->hd_deflater,
max_deflate_dynamic_table_size, mem);
if (rv != 0) {
goto fail_hd_deflater;
}
rv = nghttp2_hd_inflate_init(&(*session_ptr)->hd_inflater, mem);
if (rv != 0) {
goto fail_hd_inflater;
}
nbuffer = ((*session_ptr)->max_send_header_block_length +
NGHTTP2_FRAMEBUF_CHUNKLEN - 1) /
NGHTTP2_FRAMEBUF_CHUNKLEN;
if (nbuffer == 0) {
nbuffer = 1;
}
/* 1 for Pad Field. */
rv = nghttp2_bufs_init3(&(*session_ptr)->aob.framebufs,
NGHTTP2_FRAMEBUF_CHUNKLEN, nbuffer, 1,
NGHTTP2_FRAME_HDLEN + 1, mem);
if (rv != 0) {
goto fail_aob_framebuf;
}
nghttp2_map_init(&(*session_ptr)->streams, mem);
active_outbound_item_reset(&(*session_ptr)->aob, mem);
(*session_ptr)->callbacks = *callbacks;
(*session_ptr)->user_data = user_data;
session_inbound_frame_reset(*session_ptr);
if (nghttp2_enable_strict_preface) {
nghttp2_inbound_frame *iframe = &(*session_ptr)->iframe;
if (server && ((*session_ptr)->opt_flags &
NGHTTP2_OPTMASK_NO_RECV_CLIENT_MAGIC) == 0) {
iframe->state = NGHTTP2_IB_READ_CLIENT_MAGIC;
iframe->payloadleft = NGHTTP2_CLIENT_MAGIC_LEN;
} else {
iframe->state = NGHTTP2_IB_READ_FIRST_SETTINGS;
}
if (!server) {
(*session_ptr)->aob.state = NGHTTP2_OB_SEND_CLIENT_MAGIC;
nghttp2_bufs_add(&(*session_ptr)->aob.framebufs, NGHTTP2_CLIENT_MAGIC,
NGHTTP2_CLIENT_MAGIC_LEN);
}
}
for (i = 0; i < NGHTTP2_EXTPRI_URGENCY_LEVELS; ++i) {
nghttp2_pq_init(&(*session_ptr)->sched[i].ob_data, stream_less, mem);
}
return 0;
fail_aob_framebuf:
nghttp2_hd_inflate_free(&(*session_ptr)->hd_inflater);
fail_hd_inflater:
nghttp2_hd_deflate_free(&(*session_ptr)->hd_deflater);
fail_hd_deflater:
nghttp2_mem_free(mem, *session_ptr);
fail_session:
return rv;
}
int nghttp2_session_client_new(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data) {
return nghttp2_session_client_new3(session_ptr, callbacks, user_data, NULL,
NULL);
}
int nghttp2_session_client_new2(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data, const nghttp2_option *option) {
return nghttp2_session_client_new3(session_ptr, callbacks, user_data, option,
NULL);
}
int nghttp2_session_client_new3(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data, const nghttp2_option *option,
nghttp2_mem *mem) {
int rv;
nghttp2_session *session;
rv = session_new(&session, callbacks, user_data, 0, option, mem);
if (rv != 0) {
return rv;
}
/* IDs for use in client */
session->next_stream_id = 1;
*session_ptr = session;
return 0;
}
int nghttp2_session_server_new(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data) {
return nghttp2_session_server_new3(session_ptr, callbacks, user_data, NULL,
NULL);
}
int nghttp2_session_server_new2(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data, const nghttp2_option *option) {
return nghttp2_session_server_new3(session_ptr, callbacks, user_data, option,
NULL);
}
int nghttp2_session_server_new3(nghttp2_session **session_ptr,
const nghttp2_session_callbacks *callbacks,
void *user_data, const nghttp2_option *option,
nghttp2_mem *mem) {
int rv;
nghttp2_session *session;
rv = session_new(&session, callbacks, user_data, 1, option, mem);
if (rv != 0) {
return rv;
}
/* IDs for use in client */
session->next_stream_id = 2;
*session_ptr = session;
return 0;
}
static int free_streams(void *entry, void *ptr) {
nghttp2_session *session;
nghttp2_stream *stream;
nghttp2_outbound_item *item;
nghttp2_mem *mem;
session = (nghttp2_session *)ptr;
mem = &session->mem;
stream = (nghttp2_stream *)entry;
item = stream->item;
if (item && !item->queued && item != session->aob.item) {
nghttp2_outbound_item_free(item, mem);
nghttp2_mem_free(mem, item);
}
nghttp2_stream_free(stream);
nghttp2_mem_free(mem, stream);
return 0;
}
static void ob_q_free(nghttp2_outbound_queue *q, nghttp2_mem *mem) {
nghttp2_outbound_item *item, *next;
for (item = q->head; item;) {
next = item->qnext;
nghttp2_outbound_item_free(item, mem);
nghttp2_mem_free(mem, item);
item = next;
}
}
static int inflight_settings_new(nghttp2_inflight_settings **settings_ptr,
const nghttp2_settings_entry *iv, size_t niv,
nghttp2_mem *mem) {
*settings_ptr = nghttp2_mem_malloc(mem, sizeof(nghttp2_inflight_settings));
if (!*settings_ptr) {
return NGHTTP2_ERR_NOMEM;
}
if (niv > 0) {
(*settings_ptr)->iv = nghttp2_frame_iv_copy(iv, niv, mem);
if (!(*settings_ptr)->iv) {
nghttp2_mem_free(mem, *settings_ptr);
return NGHTTP2_ERR_NOMEM;
}
} else {
(*settings_ptr)->iv = NULL;
}
(*settings_ptr)->niv = niv;
(*settings_ptr)->next = NULL;
return 0;
}
static void inflight_settings_del(nghttp2_inflight_settings *settings,
nghttp2_mem *mem) {
if (!settings) {
return;
}
nghttp2_mem_free(mem, settings->iv);
nghttp2_mem_free(mem, settings);
}
void nghttp2_session_del(nghttp2_session *session) {
nghttp2_mem *mem;
nghttp2_inflight_settings *settings;
size_t i;
if (session == NULL) {
return;
}
mem = &session->mem;
for (settings = session->inflight_settings_head; settings;) {
nghttp2_inflight_settings *next = settings->next;
inflight_settings_del(settings, mem);
settings = next;
}
for (i = 0; i < NGHTTP2_EXTPRI_URGENCY_LEVELS; ++i) {
nghttp2_pq_free(&session->sched[i].ob_data);
}
nghttp2_stream_free(&session->root);
/* Have to free streams first, so that we can check
stream->item->queued */
nghttp2_map_each_free(&session->streams, free_streams, session);
nghttp2_map_free(&session->streams);
ob_q_free(&session->ob_urgent, mem);
ob_q_free(&session->ob_reg, mem);
ob_q_free(&session->ob_syn, mem);
active_outbound_item_reset(&session->aob, mem);
session_inbound_frame_reset(session);
nghttp2_hd_deflate_free(&session->hd_deflater);
nghttp2_hd_inflate_free(&session->hd_inflater);
nghttp2_bufs_free(&session->aob.framebufs);
nghttp2_mem_free(mem, session);
}
int nghttp2_session_reprioritize_stream(
nghttp2_session *session, nghttp2_stream *stream,
const nghttp2_priority_spec *pri_spec_in) {
int rv;
nghttp2_stream *dep_stream = NULL;
nghttp2_priority_spec pri_spec_default;
const nghttp2_priority_spec *pri_spec = pri_spec_in;
assert((!session->server && session->pending_no_rfc7540_priorities != 1) ||
(session->server && !session_no_rfc7540_pri_no_fallback(session)));
assert(pri_spec->stream_id != stream->stream_id);
if (!nghttp2_stream_in_dep_tree(stream)) {
return 0;
}
if (pri_spec->stream_id != 0) {
dep_stream = nghttp2_session_get_stream_raw(session, pri_spec->stream_id);
if (!dep_stream &&
session_detect_idle_stream(session, pri_spec->stream_id)) {
nghttp2_priority_spec_default_init(&pri_spec_default);
dep_stream = nghttp2_session_open_stream(
session, pri_spec->stream_id, NGHTTP2_FLAG_NONE, &pri_spec_default,
NGHTTP2_STREAM_IDLE, NULL);
if (dep_stream == NULL) {
return NGHTTP2_ERR_NOMEM;
}
} else if (!dep_stream || !nghttp2_stream_in_dep_tree(dep_stream)) {
nghttp2_priority_spec_default_init(&pri_spec_default);
pri_spec = &pri_spec_default;
}
}
if (pri_spec->stream_id == 0) {
dep_stream = &session->root;
} else if (nghttp2_stream_dep_find_ancestor(dep_stream, stream)) {
DEBUGF("stream: cycle detected, dep_stream(%p)=%d stream(%p)=%d\n",
dep_stream, dep_stream->stream_id, stream, stream->stream_id);
nghttp2_stream_dep_remove_subtree(dep_stream);
rv = nghttp2_stream_dep_add_subtree(stream->dep_prev, dep_stream);
if (rv != 0) {
return rv;
}
}
assert(dep_stream);
if (dep_stream == stream->dep_prev && !pri_spec->exclusive) {
/* This is minor optimization when just weight is changed. */
nghttp2_stream_change_weight(stream, pri_spec->weight);
return 0;
}
nghttp2_stream_dep_remove_subtree(stream);
/* We have to update weight after removing stream from tree */
stream->weight = pri_spec->weight;
if (pri_spec->exclusive) {
rv = nghttp2_stream_dep_insert_subtree(dep_stream, stream);
} else {
rv = nghttp2_stream_dep_add_subtree(dep_stream, stream);
}
if (rv != 0) {
return rv;
}
return 0;
}
static uint64_t pq_get_first_cycle(nghttp2_pq *pq) {
nghttp2_stream *stream;
if (nghttp2_pq_empty(pq)) {
return 0;
}
stream = nghttp2_struct_of(nghttp2_pq_top(pq), nghttp2_stream, pq_entry);
return stream->cycle;
}
static int session_ob_data_push(nghttp2_session *session,
nghttp2_stream *stream) {
int rv;
uint32_t urgency;
int inc;
nghttp2_pq *pq;
assert(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES);
assert(stream->queued == 0);
urgency = nghttp2_extpri_uint8_urgency(stream->extpri);
inc = nghttp2_extpri_uint8_inc(stream->extpri);
assert(urgency < NGHTTP2_EXTPRI_URGENCY_LEVELS);
pq = &session->sched[urgency].ob_data;
stream->cycle = pq_get_first_cycle(pq);
if (inc) {
stream->cycle += stream->last_writelen;
}
rv = nghttp2_pq_push(pq, &stream->pq_entry);
if (rv != 0) {
return rv;
}
stream->queued = 1;
return 0;
}
static void session_ob_data_remove(nghttp2_session *session,
nghttp2_stream *stream) {
uint32_t urgency;
assert(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES);
assert(stream->queued == 1);
urgency = nghttp2_extpri_uint8_urgency(stream->extpri);
assert(urgency < NGHTTP2_EXTPRI_URGENCY_LEVELS);
nghttp2_pq_remove(&session->sched[urgency].ob_data, &stream->pq_entry);
stream->queued = 0;
}
static int session_attach_stream_item(nghttp2_session *session,
nghttp2_stream *stream,
nghttp2_outbound_item *item) {
int rv;
rv = nghttp2_stream_attach_item(stream, item);
if (rv != 0) {
return rv;
}
if (!(stream->flags & NGHTTP2_STREAM_FLAG_NO_RFC7540_PRIORITIES)) {
return 0;
}
rv = session_ob_data_push(session, stream);
if (rv != 0) {
nghttp2_stream_detach_item(stream);
return rv;
}
return 0;
}
static void session_detach_stream_item(nghttp2_session *session,
nghttp2_stream *stream) {
nghttp2_stream_detach_item(stream);