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1 From 608aa9fcfca2ffeba40d78c7c4e0dcb50e0d5704 Mon Sep 17 00:00:00 2001
2 From: Simon Kelley <simon@thekelleys.org.uk>
3 Date: Sun, 10 Mar 2019 22:44:15 +0000
4 Subject: [PATCH 44/57] Support TCP fastopen on incoming and outgoing
5 connections.
6
7 Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>
8 ---
9 CHANGELOG | 5 ++++-
10 src/dnsmasq.h | 1 +
11 src/forward.c | 50 +++++++++++++++++++++++++++++++++++++++++---------
12 src/network.c | 5 +++++
13 4 files changed, 51 insertions(+), 10 deletions(-)
14
15 --- a/CHANGELOG
16 +++ b/CHANGELOG
17 @@ -26,7 +26,10 @@ version 2.81
18 Thanks to Norman Rasmussen, Sven Mueller and Maciej Żenczykowski
19 for spotting and diagnosing the bug and providing patches.
20
21 -
22 + Support TCP-fastopen (RFC-7413) on both incoming and
23 + outgoing TCP connections, if supported and enabled in the OS.
24 +
25 +
26 version 2.80
27 Add support for RFC 4039 DHCP rapid commit. Thanks to Ashram Method
28 for the initial patch and motivation.
29 --- a/src/dnsmasq.h
30 +++ b/src/dnsmasq.h
31 @@ -128,6 +128,7 @@ typedef unsigned long long u64;
32 #include <netinet/ip.h>
33 #include <netinet/ip6.h>
34 #include <netinet/ip_icmp.h>
35 +#include <netinet/tcp.h>
36 #include <sys/uio.h>
37 #include <syslog.h>
38 #include <dirent.h>
39 --- a/src/forward.c
40 +++ b/src/forward.c
41 @@ -1635,6 +1635,8 @@ static int tcp_key_recurse(time_t now, i
42
43 while (1)
44 {
45 + int data_sent = 0;
46 +
47 if (!firstsendto)
48 firstsendto = server;
49 else
50 @@ -1667,8 +1669,22 @@ static int tcp_key_recurse(time_t now, i
51 setsockopt(server->tcpfd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int));
52 #endif
53
54 - if (!local_bind(server->tcpfd, &server->source_addr, server->interface, 0, 1) ||
55 - connect(server->tcpfd, &server->addr.sa, sa_len(&server->addr)) == -1)
56 + if (!local_bind(server->tcpfd, &server->source_addr, server->interface, 0, 1))
57 + {
58 + close(server->tcpfd);
59 + server->tcpfd = -1;
60 + continue; /* No good, next server */
61 + }
62 +
63 +#ifdef MSG_FASTOPEN
64 + while(retry_send(sendto(server->tcpfd, packet, m + sizeof(u16),
65 + MSG_FASTOPEN, &server->addr.sa, sa_len(&server->addr))));
66 +
67 + if (errno == 0)
68 + data_sent = 1;
69 +#endif
70 +
71 + if (!data_sent && connect(server->tcpfd, &server->addr.sa, sa_len(&server->addr)) == -1)
72 {
73 close(server->tcpfd);
74 server->tcpfd = -1;
75 @@ -1678,7 +1694,7 @@ static int tcp_key_recurse(time_t now, i
76 server->flags &= ~SERV_GOT_TCP;
77 }
78
79 - if (!read_write(server->tcpfd, packet, m + sizeof(u16), 0) ||
80 + if ((!data_sent && !read_write(server->tcpfd, packet, m + sizeof(u16), 0)) ||
81 !read_write(server->tcpfd, &c1, 1, 1) ||
82 !read_write(server->tcpfd, &c2, 1, 1) ||
83 !read_write(server->tcpfd, payload, (c1 << 8) | c2, 1))
84 @@ -1951,6 +1967,8 @@ unsigned char *tcp_request(int confd, ti
85 which can go to the same server, do so. */
86 while (1)
87 {
88 + int data_sent = 0;
89 +
90 if (!firstsendto)
91 firstsendto = last_server;
92 else
93 @@ -1969,6 +1987,8 @@ unsigned char *tcp_request(int confd, ti
94 continue;
95
96 retry:
97 + *length = htons(size);
98 +
99 if (last_server->tcpfd == -1)
100 {
101 if ((last_server->tcpfd = socket(last_server->addr.sa.sa_family, SOCK_STREAM, 0)) == -1)
102 @@ -1978,10 +1998,24 @@ unsigned char *tcp_request(int confd, ti
103 /* Copy connection mark of incoming query to outgoing connection. */
104 if (have_mark)
105 setsockopt(last_server->tcpfd, SOL_SOCKET, SO_MARK, &mark, sizeof(unsigned int));
106 -#endif
107 +#endif
108
109 - if ((!local_bind(last_server->tcpfd, &last_server->source_addr, last_server->interface, 0, 1) ||
110 - connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1))
111 + if ((!local_bind(last_server->tcpfd, &last_server->source_addr, last_server->interface, 0, 1)))
112 + {
113 + close(last_server->tcpfd);
114 + last_server->tcpfd = -1;
115 + continue;
116 + }
117 +
118 +#ifdef MSG_FASTOPEN
119 + while(retry_send(sendto(last_server->tcpfd, packet, size + sizeof(u16),
120 + MSG_FASTOPEN, &last_server->addr.sa, sa_len(&last_server->addr))));
121 +
122 + if (errno == 0)
123 + data_sent = 1;
124 +#endif
125 +
126 + if (!data_sent && connect(last_server->tcpfd, &last_server->addr.sa, sa_len(&last_server->addr)) == -1)
127 {
128 close(last_server->tcpfd);
129 last_server->tcpfd = -1;
130 @@ -1991,13 +2025,11 @@ unsigned char *tcp_request(int confd, ti
131 last_server->flags &= ~SERV_GOT_TCP;
132 }
133
134 - *length = htons(size);
135 -
136 /* get query name again for logging - may have been overwritten */
137 if (!(gotname = extract_request(header, (unsigned int)size, daemon->namebuff, &qtype)))
138 strcpy(daemon->namebuff, "query");
139
140 - if (!read_write(last_server->tcpfd, packet, size + sizeof(u16), 0) ||
141 + if ((!data_sent && !read_write(last_server->tcpfd, packet, size + sizeof(u16), 0)) ||
142 !read_write(last_server->tcpfd, &c1, 1, 1) ||
143 !read_write(last_server->tcpfd, &c2, 1, 1) ||
144 !read_write(last_server->tcpfd, payload, (c1 << 8) | c2, 1))
145 --- a/src/network.c
146 +++ b/src/network.c
147 @@ -726,6 +726,11 @@ static int make_sock(union mysockaddr *a
148
149 if (type == SOCK_STREAM)
150 {
151 +#ifdef TCP_FASTOPEN
152 + int qlen = 5;
153 + setsockopt(fd, SOL_TCP, TCP_FASTOPEN, &qlen, sizeof(qlen));
154 +#endif
155 +
156 if (listen(fd, TCP_BACKLOG) == -1)
157 goto err;
158 }
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