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Cygwin: tcp: Support TCP_FASTOPEN

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TCP_FASTOPEN is supported since W10 1607.  Fake otherwise.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2020-06-30 14:34:19 +02:00
parent e037192b50
commit 0feb77c260
5 changed files with 93 additions and 4 deletions
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47
winsup/cygwin/fhandler_socket_inet.cc
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@ -691,7 +691,8 @@ fhandler_socket_wsock::set_socket_handle (SOCKET sock, int af, int type,
fhandler_socket_inet::fhandler_socket_inet () :
fhandler_socket_wsock (),
oobinline (false)
oobinline (false),
tcp_fastopen (false)
{
}
@ -1693,6 +1694,20 @@ fhandler_socket_inet::setsockopt (int level, int optname, const void *optval,
ignore = true;
break;
case TCP_FASTOPEN:
/* Fake FastOpen on older systems. */
if (!wincap.has_tcp_fastopen ())
{
if (type != SOCK_STREAM)
{
set_errno (EOPNOTSUPP);
return -1;
}
ignore = true;
tcp_fastopen = *(int *) optval ? true : false;
}
break;
default:
break;
}
@ -1825,6 +1840,29 @@ fhandler_socket_inet::getsockopt (int level, int optname, const void *optval,
optname = convert_ws1_ip_optname (optname);
break;
case IPPROTO_TCP:
switch (optname)
{
case TCP_FASTOPEN:
/* Fake FastOpen on older systems */
if (!wincap.has_tcp_fastopen ())
{
if (type != SOCK_STREAM)
{
set_errno (EOPNOTSUPP);
return -1;
}
*(int *) optval = tcp_fastopen ? 1 : 0;
*optlen = sizeof (int);
return 0;
}
break;
default:
break;
}
break;
default:
break;
}
@ -1869,6 +1907,10 @@ fhandler_socket_inet::getsockopt (int level, int optname, const void *optval,
onebyte = true;
break;
case TCP_FASTOPEN:
onebyte = true;
break;
default:
break;
}
@ -1881,8 +1923,7 @@ fhandler_socket_inet::getsockopt (int level, int optname, const void *optval,
/* Regression in Vista and later: instead of a 4 byte BOOL value, a
1 byte BOOLEAN value is returned, in contrast to older systems and
the documentation. Since an int type is expected by the calling
application, we convert the result here. For some reason only three
BSD-compatible socket options seem to be affected. */
application, we convert the result here. */
BOOLEAN *in = (BOOLEAN *) optval;
int *out = (int *) optval;
*out = *in;