soccr: move connect from criu to soccr

We will need to disable the repair mode before connect()
to restore syn-sent sockets. And even now connect() looks
like a part of internal logic of libsoccr.

travis-ci: success for series starting with [01/21] build: install libnet-dev
v2: remove libsoccr_set_sk_data_unbound() from soccr.h
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/sk-inet.c

@@ -594,6 +594,11 @@ static int open_inet_sk(struct file_desc *d)
 	if (restore_opt(sk, SOL_SOCKET, SO_REUSEADDR, &yes))
 		goto err;
 
+	if (ie->src_port) {
+		if (inet_bind(sk, ii))
+			goto err;
+	}
+
 	if (tcp_connection(ie)) {
 		if (!opts.tcp_established_ok) {
 			pr_err("Connected TCP socket in image\n");
@@ -614,12 +619,6 @@ static int open_inet_sk(struct file_desc *d)
 	 * Listen sockets are easiest ones -- simply
 	 * bind() and listen(), and that's all.
 	 */
-
-	if (ie->src_port) {
-		if (inet_bind(sk, ii))
-			goto err;
-	}
-
 	if (ie->state == TCP_LISTEN) {
 		if (ie->proto != IPPROTO_TCP) {
 			pr_err("Wrong socket in listen state %d\n", ie->proto);

criu/sk-tcp.c

@@ -349,15 +349,6 @@ static int restore_tcp_conn_state(int sk, struct libsoccr_sk *socr, struct inet_
 
 	(void)data;
 
-	if (libsoccr_set_sk_data_unbound(socr, &data, sizeof(data)))
-		goto err_c;
-
-	if (inet_bind(sk, ii))
-		goto err_c;
-
-	if (inet_connect(sk, ii))
-		goto err_c;
-
 	if (libsoccr_set_sk_data_noq(socr, &data, sizeof(data)))
 		goto err_c;
 

soccr/soccr.c

@@ -323,9 +323,17 @@ static int set_queue_seq(struct libsoccr_sk *sk, int queue, __u32 seq)
 	return 0;
 }
 
-int libsoccr_set_sk_data_unbound(struct libsoccr_sk *sk,
+#ifndef TCPOPT_SACK_PERM
+#define TCPOPT_SACK_PERM TCPOPT_SACK_PERMITTED
+#endif
+
+int libsoccr_set_sk_data_noq(struct libsoccr_sk *sk,
 		struct libsoccr_sk_data *data, unsigned data_size)
 {
+	struct tcp_repair_opt opts[4];
+	int addr_size;
+	int onr = 0;
+
 	if (!data || data_size < SOCR_DATA_MIN_SIZE)
 		return -1;
 
@@ -339,21 +347,15 @@ int libsoccr_set_sk_data_unbound(struct libsoccr_sk *sk,
 				data->outq_seq - data->outq_len))
 		return -3;
 
-	return 0;
-}
-
-#ifndef TCPOPT_SACK_PERM
-#define TCPOPT_SACK_PERM TCPOPT_SACK_PERMITTED
-#endif
+	if (data->dst_addr.sa.sa_family == AF_INET)
+		addr_size = sizeof(data->dst_addr.v4);
+	else
+		addr_size = sizeof(data->dst_addr.v6);
 
-int libsoccr_set_sk_data_noq(struct libsoccr_sk *sk,
-		struct libsoccr_sk_data *data, unsigned data_size)
-{
-	struct tcp_repair_opt opts[4];
-	int onr = 0;
-
-	if (!data || data_size < SOCR_DATA_MIN_SIZE)
+	if (connect(sk->fd, &data->dst_addr.sa, addr_size) == -1) {
+		loge("Can't connect inet socket back\n");
 		return -1;
+	}
 
 	logd("\tRestoring TCP options\n");
 

soccr/soccr.h

@@ -178,12 +178,12 @@ char *libsoccr_get_queue_bytes(struct libsoccr_sk *sk, int queue_id, int steal);
  * 	sk = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
  *
  * 	h = libsoccr_pause(sk)
- * 	libsoccr_set_sk_data_unbound(h, &data, sizeof(data))
  * 	bind(sk, &name, ...)
- * 	connect(sk, &name, ...)
- * 	libsoccr_set_sk_data(h, &data, sizeof(data))
+ *
+ * 	libsoccr_set_sk_data_noq(h, &data, sizeof(data))
  * 	libsoccr_set_queue_bytes(h, &data, sizeof(data), TCP_RECV_QUEUE, inq)
  * 	libsoccr_set_queue_bytes(h, &data, sizeof(data), TCP_SEND_QUEUE, outq)
+ * 	libsoccr_set_sk_data(h, &data, sizeof(data))
  *
  * 	libsoccr_resume(h)
  *
@@ -191,13 +191,6 @@ char *libsoccr_get_queue_bytes(struct libsoccr_sk *sk, int queue_id, int steal);
  * enabled back.
  */
 
-/*
- * Performs restore action while the socket is not bind()-ed and
- * not connect()-ed. The data should be the one from _get_sk_data
- * call. The data_size is the amount of bytes sitting in there.
- */
-int libsoccr_set_sk_data_unbound(struct libsoccr_sk *sk, struct libsoccr_sk_data *data, unsigned data_size);
-
 /*
  * Performs additional restore actions on bind()-ed and connect()-ed
  * socket, but without queues restored.