2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/detail/SocketFastOpen.h>
26 #include <netinet/tcp.h>
29 // Sometimes these flags are not present in the headers,
30 // so define them if not present.
31 #if !defined(MSG_FASTOPEN)
32 #define MSG_FASTOPEN 0x20000000
35 #if !defined(TCP_FASTOPEN)
36 #define TCP_FASTOPEN 23
39 #if !defined(TCPI_OPT_SYN_DATA)
40 #define TCPI_OPT_SYN_DATA 32
43 ssize_t tfo_sendmsg(int sockfd, const struct msghdr* msg, int flags) {
44 flags |= MSG_FASTOPEN;
45 return sendmsg(sockfd, msg, flags);
48 int tfo_enable(int sockfd, size_t max_queue_size) {
50 sockfd, SOL_TCP, TCP_FASTOPEN, &max_queue_size, sizeof(max_queue_size));
53 bool tfo_succeeded(int sockfd) {
54 // Call getsockopt to check if TFO was used.
56 socklen_t info_len = sizeof(info);
58 if (getsockopt(sockfd, IPPROTO_TCP, TCP_INFO, &info, &info_len) != 0) {
59 // errno is set from getsockopt
62 return info.tcpi_options & TCPI_OPT_SYN_DATA;
67 ssize_t tfo_sendmsg(int sockfd, const struct msghdr* msg, int flags) {
72 int tfo_enable(int sockfd, size_t max_queue_size) {
77 bool tfo_succeeded(int sockfd) {