package/network/services/dnsmasq/patches/0044-Support-TCP-fastopen-on-incoming-and-outgoing-connec.patch

   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      }