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- /*
- * Copyright 2016-present Facebook, Inc.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include <folly/detail/SocketFastOpen.h>
- #include <folly/portability/Sockets.h>
- #include <cerrno>
- #include <cstdio>
- namespace folly {
- namespace detail {
- #if FOLLY_ALLOW_TFO && defined(__linux__)
- // Sometimes these flags are not present in the headers,
- // so define them if not present.
- #if !defined(MSG_FASTOPEN)
- #define MSG_FASTOPEN 0x20000000
- #endif
- #if !defined(TCP_FASTOPEN)
- #define TCP_FASTOPEN 23
- #endif
- #if !defined(TCPI_OPT_SYN_DATA)
- #define TCPI_OPT_SYN_DATA 32
- #endif
- ssize_t tfo_sendmsg(int sockfd, const struct msghdr* msg, int flags) {
- flags |= MSG_FASTOPEN;
- return sendmsg(sockfd, msg, flags);
- }
- int tfo_enable(int sockfd, size_t max_queue_size) {
- return setsockopt(
- sockfd, SOL_TCP, TCP_FASTOPEN, &max_queue_size, sizeof(max_queue_size));
- }
- bool tfo_succeeded(int sockfd) {
- // Call getsockopt to check if TFO was used.
- struct tcp_info info;
- socklen_t info_len = sizeof(info);
- errno = 0;
- if (getsockopt(sockfd, IPPROTO_TCP, TCP_INFO, &info, &info_len) != 0) {
- // errno is set from getsockopt
- return false;
- }
- return info.tcpi_options & TCPI_OPT_SYN_DATA;
- }
- #elif FOLLY_ALLOW_TFO && defined(__APPLE__)
- ssize_t tfo_sendmsg(int sockfd, const struct msghdr* msg, int flags) {
- sa_endpoints_t endpoints;
- endpoints.sae_srcif = 0;
- endpoints.sae_srcaddr = nullptr;
- endpoints.sae_srcaddrlen = 0;
- endpoints.sae_dstaddr = (struct sockaddr*)msg->msg_name;
- endpoints.sae_dstaddrlen = msg->msg_namelen;
- int ret = connectx(
- sockfd,
- &endpoints,
- SAE_ASSOCID_ANY,
- CONNECT_RESUME_ON_READ_WRITE | CONNECT_DATA_IDEMPOTENT,
- nullptr,
- 0,
- nullptr,
- nullptr);
- if (ret != 0) {
- return ret;
- }
- ret = sendmsg(sockfd, msg, flags);
- return ret;
- }
- int tfo_enable(int sockfd, size_t max_queue_size) {
- return setsockopt(
- sockfd,
- IPPROTO_TCP,
- TCP_FASTOPEN,
- &max_queue_size,
- sizeof(max_queue_size));
- }
- bool tfo_succeeded(int /* sockfd */) {
- errno = EOPNOTSUPP;
- return false;
- }
- #else
- ssize_t
- tfo_sendmsg(int /* sockfd */, const struct msghdr* /* msg */, int /* flags */) {
- errno = EOPNOTSUPP;
- return -1;
- }
- int tfo_enable(int /* sockfd */, size_t /* max_queue_size */) {
- errno = ENOPROTOOPT;
- return -1;
- }
- bool tfo_succeeded(int /* sockfd */) {
- errno = EOPNOTSUPP;
- return false;
- }
- #endif
- } // namespace detail
- } // namespace folly
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