criu: add RPC interface for skip in-flight connections

For the previously added option to skip in-flight connections this adds
that option to the RPC interface. The skip in-flight connections is also
described in criu.txt.
Signed-off-by: Adrian Reber <areber@redhat.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

Documentation/criu.txt

@@ -199,6 +199,13 @@ Thus for command line argument the example above will look like:
 *--tcp-established*::
     Checkpoint established TCP connections.
 
+*--skip-in-flight*::
+    This option skips in-flight TCP connections. If TCP connections
+    are found which are not yet completely established, criu will
+    ignore these connections in favor of erroring out.
+    The TCP stack on the client side is expected to handle the
+    re-connect gracefully.
+
 *--veth-pair* '<IN>'*=*'<OUT>'::
     Correspondence between outside and inside names of veth devices.
 

criu/cr-service.c

@@ -322,6 +322,9 @@ static int setup_opts_from_req(int sk, CriuOpts *req)
 	if (req->has_tcp_established)
 		opts.tcp_established_ok = req->tcp_established;
 
+	if (req->has_tcp_skip_in_flight)
+		opts.tcp_skip_in_flight = req->tcp_skip_in_flight;
+
 	if (req->has_evasive_devices)
 		opts.evasive_devices = req->evasive_devices;
 

images/rpc.proto

@@ -104,6 +104,7 @@ message criu_opts {
 
 	optional string			freeze_cgroup		= 44;
 	optional uint32			timeout			= 45;
+	optional bool			tcp_skip_in_flight	= 46;
 }
 
 message criu_dump_resp {

lib/c/criu.c

@@ -309,6 +309,17 @@ void criu_set_tcp_established(bool tcp_established)
 	criu_local_set_tcp_established(global_opts, tcp_established);
 }
 
+void criu_local_set_tcp_skip_in_flight(criu_opts *opts, bool tcp_skip_in_flight)
+{
+	opts->rpc->has_tcp_skip_in_flight	= true;
+	opts->rpc->tcp_skip_in_flight		= tcp_skip_in_flight;
+}
+
+void criu_set_tcp_skip_in_flight(bool tcp_skip_in_flight)
+{
+	criu_local_set_tcp_skip_in_flight(global_opts, tcp_skip_in_flight);
+}
+
 void criu_local_set_evasive_devices(criu_opts *opts, bool evasive_devices)
 {
 	opts->rpc->has_evasive_devices	= true;

lib/c/criu.h

@@ -65,6 +65,7 @@ void criu_set_leave_running(bool leave_running);
 void criu_set_ext_unix_sk(bool ext_unix_sk);
 int criu_add_unix_sk(unsigned int inode);
 void criu_set_tcp_established(bool tcp_established);
+void criu_set_tcp_skip_in_flight(bool tcp_skip_in_flight);
 void criu_set_evasive_devices(bool evasive_devices);
 void criu_set_shell_job(bool shell_job);
 void criu_set_file_locks(bool file_locks);
@@ -169,6 +170,7 @@ void criu_local_set_leave_running(criu_opts *opts, bool leave_running);
 void criu_local_set_ext_unix_sk(criu_opts *opts, bool ext_unix_sk);
 int criu_local_add_unix_sk(criu_opts *opts, unsigned int inode);
 void criu_local_set_tcp_established(criu_opts *opts, bool tcp_established);
+void criu_local_set_tcp_skip_in_flight(criu_opts *opts, bool tcp_skip_in_flight);
 void criu_local_set_evasive_devices(criu_opts *opts, bool evasive_devices);
 void criu_local_set_shell_job(criu_opts *opts, bool shell_job);
 void criu_local_set_file_locks(criu_opts *opts, bool file_locks);