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NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | NOTE | SINCE | REPORTING BUGS | COPYRIGHT | SEE ALSO | COLOPHON |
gnutls_transport_set_fastopen(3) gnutls gnutls_transport_set_fastopen(3)
gnutls_transport_set_fastopen - API function
#include <gnutls/socket.h>
void gnutls_transport_set_fastopen(gnutls_session_t session, int fd,
struct sockaddr * connect_addr, socklen_t connect_addrlen, unsigned
int flags);
gnutls_session_t session
is a gnutls_session_t type.
int fd is the session's socket descriptor
struct sockaddr * connect_addr
is the address we want to connect to
socklen_t connect_addrlen
is the length of connect_addr
unsigned int flags
must be zero
Enables TCP Fast Open (TFO) for the specified TLS client session.
That means that TCP connection establishment and the transmission of
the first TLS client hello packet are combined. The peer's address
must be specified in connect_addr and connect_addrlen , and the
socket specified by fd should not be connected.
TFO only works for TCP sockets of type AF_INET and AF_INET6. If the
OS doesn't support TCP fast open this function will result to gnutls
using connect() transparently during the first write.
This function overrides all the transport callback functions. If
this is undesirable, TCP Fast Open must be implemented on the user
callback functions without calling this function. When using this
function, transport callbacks must not be set, and
gnutls_transport_set_ptr() or gnutls_transport_set_int() must not be
called.
On GNU/Linux TFO has to be enabled at the system layer, that is in
/proc/sys/net/ipv4/tcp_fastopen, bit 0 has to be set.
This function has no effect on server sessions.
3.5.3
Report bugs to <bugs@gnutls.org>.
Home page: http://www.gnutls.org
Copyright © 2001-2017 Free Software Foundation, Inc., and others.
Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
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http://www.gnutls.org/manual/
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gnutls 3.5.9 gnutls_transport_set_fastopen(3)