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socket: add support for TCP fast Open

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TCP Fast Open (TFO) speeds up the opening of successiveTCP)
connections between two endpoints.It works by using a TFO cookie
in the initial SYN packet to authenticate a previously connected
client. It starts sending data to the client before the receipt
of the final ACK packet of the three way handshake is received,
skipping a round trip and lowering the latency in the start of
transmission of data.
This commit is contained in:
Susant Sahani 2014-08-14 14:31:47 +05:30 committed by Lennart Poettering
parent 41488fe902
commit 9528592ff8
5 changed files with 26 additions and 0 deletions
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15
man/systemd.socket.xml
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@ -498,6 +498,21 @@
<option>false</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>FastOpen=</varname></term>
<listitem><para>Takes a boolean
argument. It works by using a TFO cookie (a TCP option) in the initial
SYN packet to authenticate a previously connected client. If successful,
it may start sending data to the client before the receipt of the final
ACK packet of the three way handshake is received, skipping a round trip
and lowering the latency in the start of transmission of data.
This controls the TCP_FASTOPEN socket option (see
the <ulink url="http://lwn.net/Articles/508865/">TCP
Fast Open: expediting web services</ulink> for details.)
Defaults to
<option>false</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>Priority=</varname></term>
<listitem><para>Takes an integer

1
src/core/dbus-socket.c
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@ -97,6 +97,7 @@ const sd_bus_vtable bus_socket_vtable[] = {
SD_BUS_PROPERTY("DirectoryMode", "u", bus_property_get_mode, offsetof(Socket, directory_mode), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Accept", "b", bus_property_get_bool, offsetof(Socket, accept), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("KeepAlive", "b", bus_property_get_bool, offsetof(Socket, keep_alive), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("FastOpen" , "b", bus_property_get_bool, offsetof(Socket, fast_open), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("Priority", "i", bus_property_get_int, offsetof(Socket, priority), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("ReceiveBuffer", "t", bus_property_get_size, offsetof(Socket, receive_buffer), SD_BUS_VTABLE_PROPERTY_CONST),
SD_BUS_PROPERTY("SendBuffer", "t", bus_property_get_size, offsetof(Socket, send_buffer), SD_BUS_VTABLE_PROPERTY_CONST),

1
src/core/load-fragment-gperf.gperf.m4
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@ -232,6 +232,7 @@ Socket.Accept, config_parse_bool, 0,
Socket.MaxConnections, config_parse_unsigned, 0, offsetof(Socket, max_connections)
Socket.KeepAlive, config_parse_bool, 0, offsetof(Socket, keep_alive)
Socket.NoDelay, config_parse_bool, 0, offsetof(Socket, no_delay)
Socket.FastOpen, config_parse_bool, 0, offsetof(Socket, fast_open)
Socket.Priority, config_parse_int, 0, offsetof(Socket, priority)
Socket.ReceiveBuffer, config_parse_iec_size, 0, offsetof(Socket, receive_buffer)
Socket.SendBuffer, config_parse_iec_size, 0, offsetof(Socket, send_buffer)

8
src/core/socket.c
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@ -481,6 +481,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
"%sDirectoryMode: %04o\n"
"%sKeepAlive: %s\n"
"%sNoDelay: %s\n"
"%sFastOpen: %s\n"
"%sFreeBind: %s\n"
"%sTransparent: %s\n"
"%sBroadcast: %s\n"
@ -496,6 +497,7 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
prefix, s->directory_mode,
prefix, yes_no(s->keep_alive),
prefix, yes_no(s->no_delay),
prefix, yes_no(s->fast_open),
prefix, yes_no(s->free_bind),
prefix, yes_no(s->transparent),
prefix, yes_no(s->broadcast),
@ -798,6 +800,12 @@ static void socket_apply_socket_options(Socket *s, int fd) {
log_warning_unit(UNIT(s)->id, "TCP_NODELAY failed: %m");
}
if (s->fast_open) {
int b = s->fast_open;
if (setsockopt(fd, SOL_TCP, TCP_FASTOPEN, &b, sizeof(b)) < 0)
log_warning_unit(UNIT(s)->id, "TCP_FASTOPEN failed: %m");
}
if (s->broadcast) {
int one = 1;
if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one)) < 0)

1
src/core/socket.h
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@ -135,6 +135,7 @@ struct Socket {
/* Socket options */
bool keep_alive;
bool no_delay;
bool fast_open;
bool free_bind;
bool transparent;
bool broadcast;