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socket: Add Support for TCP keep alive variables
The tcp keep alive variables now can be configured via conf parameter. Follwing variables are now supported by this patch. tcp_keepalive_intvl: The number of seconds between TCP keep-alive probes tcp_keepalive_probes: The maximum number of TCP keep-alive probes to send before giving up and killing the connection if no response is obtained from the other end. tcp_keepalive_time: The number of seconds a connection needs to be idle before TCP begins sending out keep-alive probes.
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@ -487,6 +487,42 @@
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<option>false</option>.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>KeepAliveTime=</varname></term>
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<listitem><para>Takes time (in seconds) as argument . The connection needs to remain
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idle before TCP starts sending keepalive probes. This controls the TCP_KEEPIDLE
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socket option (see
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<citerefentry><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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and the <ulink
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url="http://www.tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/">TCP
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Keepalive HOWTO</ulink> for details.)
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Defaults value is 7200 seconds (2 hours).</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>KeepAliveInterval=</varname></term>
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<listitem><para>Takes time (in seconds) as argument between individual keepalive probes,
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if the socket option SO_KEEPALIVE has been set on this socket seconds as argument.
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This controls the TCP_KEEPINTVL socket option (see
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<citerefentry><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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and the <ulink
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url="http://www.tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/">TCP
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Keepalive HOWTO</ulink> for details.)
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Defaults value is 75 seconds.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>KeepAliveProbes=</varname></term>
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<listitem><para>Takes interger as argument. It's the number of unacknowledged probes to
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send before considering the connection dead and notifying the application layer.
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This controls the TCP_KEEPCNT socket option (see
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<citerefentry><refentrytitle>socket</refentrytitle><manvolnum>7</manvolnum></citerefentry>
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and the <ulink
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url="http://www.tldp.org/HOWTO/html_single/TCP-Keepalive-HOWTO/">TCP
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Keepalive HOWTO</ulink> for details.)
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Defaults value is 9.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>NoDelay=</varname></term>
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<listitem><para>Takes a boolean
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@ -97,6 +97,9 @@ const sd_bus_vtable bus_socket_vtable[] = {
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SD_BUS_PROPERTY("DirectoryMode", "u", bus_property_get_mode, offsetof(Socket, directory_mode), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("Accept", "b", bus_property_get_bool, offsetof(Socket, accept), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("KeepAlive", "b", bus_property_get_bool, offsetof(Socket, keep_alive), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("KeepAliveTime", "t", bus_property_get_usec, offsetof(Socket, keep_alive_time), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("KeepAliveInterval", "t", bus_property_get_usec, offsetof(Socket, keep_alive_interval), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("KeepAliveProbes", "u", bus_property_get_unsigned, offsetof(Socket, keep_alive_cnt), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("Priority", "i", bus_property_get_int, offsetof(Socket, priority), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("ReceiveBuffer", "t", bus_property_get_size, offsetof(Socket, receive_buffer), SD_BUS_VTABLE_PROPERTY_CONST),
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SD_BUS_PROPERTY("SendBuffer", "t", bus_property_get_size, offsetof(Socket, send_buffer), SD_BUS_VTABLE_PROPERTY_CONST),
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@ -231,6 +231,9 @@ Socket.DirectoryMode, config_parse_mode, 0,
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Socket.Accept, config_parse_bool, 0, offsetof(Socket, accept)
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Socket.MaxConnections, config_parse_unsigned, 0, offsetof(Socket, max_connections)
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Socket.KeepAlive, config_parse_bool, 0, offsetof(Socket, keep_alive)
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Socket.KeepAliveTime, config_parse_sec, 0, offsetof(Socket, keep_alive_time)
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Socket.KeepAliveInterval, config_parse_sec, 0, offsetof(Socket, keep_alive_interval)
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Socket.KeepAliveProbes, config_parse_unsigned, 0, offsetof(Socket, keep_alive_cnt)
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Socket.NoDelay, config_parse_bool, 0, offsetof(Socket, no_delay)
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Socket.Priority, config_parse_int, 0, offsetof(Socket, priority)
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Socket.ReceiveBuffer, config_parse_iec_size, 0, offsetof(Socket, receive_buffer)
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@ -462,6 +462,7 @@ _const_ static const char* listen_lookup(int family, int type) {
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}
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static void socket_dump(Unit *u, FILE *f, const char *prefix) {
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char time_string[FORMAT_TIMESPAN_MAX];
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SocketExecCommand c;
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Socket *s = SOCKET(u);
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SocketPort *p;
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@ -595,6 +596,23 @@ static void socket_dump(Unit *u, FILE *f, const char *prefix) {
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prefix, strna(s->user),
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prefix, strna(s->group));
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if(s->keep_alive_time)
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fprintf(f,
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"%sKeepAliveTime: %s\n",
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prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX,
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s->keep_alive_time, USEC_PER_SEC));
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if(s->keep_alive_interval)
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fprintf(f,
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"%sKeepAliveInterval: %s\n",
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prefix, format_timespan(time_string, FORMAT_TIMESPAN_MAX,
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s->keep_alive_interval, USEC_PER_SEC));
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if(s->keep_alive_cnt)
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fprintf(f,
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"%sKeepAliveProbes: %u\n",
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prefix, s->keep_alive_cnt);
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LIST_FOREACH(port, p, s->ports) {
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if (p->type == SOCKET_SOCKET) {
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@ -792,6 +810,24 @@ static void socket_apply_socket_options(Socket *s, int fd) {
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log_warning_unit(UNIT(s)->id, "SO_KEEPALIVE failed: %m");
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}
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if (s->keep_alive_time) {
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int value = s->keep_alive_time / USEC_PER_SEC;
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if (setsockopt(fd, SOL_TCP, TCP_KEEPIDLE, &value, sizeof(value)) < 0)
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log_warning_unit(UNIT(s)->id, "TCP_KEEPIDLE failed: %m");
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}
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if (s->keep_alive_interval) {
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int value = s->keep_alive_interval / USEC_PER_SEC;
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if (setsockopt(fd, SOL_TCP, TCP_KEEPINTVL, &value, sizeof(value)) < 0)
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log_warning_unit(UNIT(s)->id, "TCP_KEEPINTVL failed: %m");
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}
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if (s->keep_alive_cnt) {
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int value = s->keep_alive_cnt;
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if (setsockopt(fd, SOL_SOCKET, TCP_KEEPCNT, &value, sizeof(value)) < 0)
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log_warning_unit(UNIT(s)->id, "TCP_KEEPCNT failed: %m");
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}
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if (s->no_delay) {
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int b = s->no_delay;
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if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &b, sizeof(b)) < 0)
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@ -101,7 +101,10 @@ struct Socket {
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unsigned max_connections;
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unsigned backlog;
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unsigned keep_alive_cnt;
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usec_t timeout_usec;
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usec_t keep_alive_time;
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usec_t keep_alive_interval;
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ExecCommand* exec_command[_SOCKET_EXEC_COMMAND_MAX];
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ExecContext exec_context;
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