1 | /* |
2 | * Copyright 2016-present Facebook, Inc. |
3 | * |
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 |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
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. |
15 | */ |
16 | |
17 | #include <folly/detail/SocketFastOpen.h> |
18 | |
19 | #include <folly/portability/Sockets.h> |
20 | |
21 | #include <cerrno> |
22 | #include <cstdio> |
23 | |
24 | namespace folly { |
25 | namespace detail { |
26 | |
27 | #if FOLLY_ALLOW_TFO && defined(__linux__) |
28 | |
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 |
33 | #endif |
34 | |
35 | #if !defined(TCP_FASTOPEN) |
36 | #define TCP_FASTOPEN 23 |
37 | #endif |
38 | |
39 | #if !defined(TCPI_OPT_SYN_DATA) |
40 | #define TCPI_OPT_SYN_DATA 32 |
41 | #endif |
42 | |
43 | ssize_t tfo_sendmsg(NetworkSocket sockfd, const struct msghdr* msg, int flags) { |
44 | flags |= MSG_FASTOPEN; |
45 | return netops::sendmsg(sockfd, msg, flags); |
46 | } |
47 | |
48 | int tfo_enable(NetworkSocket sockfd, size_t max_queue_size) { |
49 | return netops::setsockopt( |
50 | sockfd, SOL_TCP, TCP_FASTOPEN, &max_queue_size, sizeof(max_queue_size)); |
51 | } |
52 | |
53 | bool tfo_succeeded(NetworkSocket sockfd) { |
54 | // Call getsockopt to check if TFO was used. |
55 | struct tcp_info info; |
56 | socklen_t info_len = sizeof(info); |
57 | errno = 0; |
58 | if (netops::getsockopt(sockfd, IPPROTO_TCP, TCP_INFO, &info, &info_len) != |
59 | 0) { |
60 | // errno is set from getsockopt |
61 | return false; |
62 | } |
63 | return info.tcpi_options & TCPI_OPT_SYN_DATA; |
64 | } |
65 | |
66 | #elif FOLLY_ALLOW_TFO && defined(__APPLE__) |
67 | |
68 | ssize_t tfo_sendmsg(NetworkSocket sockfd, const struct msghdr* msg, int flags) { |
69 | sa_endpoints_t endpoints; |
70 | endpoints.sae_srcif = 0; |
71 | endpoints.sae_srcaddr = nullptr; |
72 | endpoints.sae_srcaddrlen = 0; |
73 | endpoints.sae_dstaddr = (struct sockaddr*)msg->msg_name; |
74 | endpoints.sae_dstaddrlen = msg->msg_namelen; |
75 | int ret = connectx( |
76 | sockfd.toFd(), |
77 | &endpoints, |
78 | SAE_ASSOCID_ANY, |
79 | CONNECT_RESUME_ON_READ_WRITE | CONNECT_DATA_IDEMPOTENT, |
80 | nullptr, |
81 | 0, |
82 | nullptr, |
83 | nullptr); |
84 | |
85 | if (ret != 0) { |
86 | return ret; |
87 | } |
88 | ret = netops::sendmsg(sockfd, msg, flags); |
89 | return ret; |
90 | } |
91 | |
92 | int tfo_enable(NetworkSocket sockfd, size_t max_queue_size) { |
93 | return netops::setsockopt( |
94 | sockfd, |
95 | IPPROTO_TCP, |
96 | TCP_FASTOPEN, |
97 | &max_queue_size, |
98 | sizeof(max_queue_size)); |
99 | } |
100 | |
101 | bool tfo_succeeded(NetworkSocket /* sockfd */) { |
102 | errno = EOPNOTSUPP; |
103 | return false; |
104 | } |
105 | |
106 | #else |
107 | |
108 | ssize_t tfo_sendmsg( |
109 | NetworkSocket /* sockfd */, |
110 | const struct msghdr* /* msg */, |
111 | int /* flags */) { |
112 | errno = EOPNOTSUPP; |
113 | return -1; |
114 | } |
115 | |
116 | int tfo_enable(NetworkSocket /* sockfd */, size_t /* max_queue_size */) { |
117 | errno = ENOPROTOOPT; |
118 | return -1; |
119 | } |
120 | |
121 | bool tfo_succeeded(NetworkSocket /* sockfd */) { |
122 | errno = EOPNOTSUPP; |
123 | return false; |
124 | } |
125 | |
126 | #endif |
127 | } // namespace detail |
128 | } // namespace folly |
129 | |