diff --git a/criu/sk-tcp.c b/criu/sk-tcp.c
index b5cf7a781..310592c9a 100644
--- a/criu/sk-tcp.c
+++ b/criu/sk-tcp.c
@@ -353,11 +353,22 @@ static int tcp_get_window(int sk, TcpStreamEntry *tse)
 
 static int dump_tcp_conn_state(struct inet_sk_desc *sk)
 {
+	struct libsoccr_sk *socr = sk->priv;
 	int ret, aux;
 	struct tcp_info ti;
 	struct cr_img *img;
 	TcpStreamEntry tse = TCP_STREAM_ENTRY__INIT;
 	char *in_buf, *out_buf;
+	struct libsoccr_sk_data data;
+
+	ret = libsoccr_get_sk_data(socr, &data, sizeof(data));
+	if (ret < 0)
+		goto err_r;
+	if (ret != sizeof(data)) {
+		pr_err("This libsocr is not supported (%d vs %d)\n",
+				ret, (int)sizeof(data));
+		goto err_r;
+	}
 
 	ret = refresh_inet_sk(sk, &ti);
 	if (ret < 0)
diff --git a/soccr/soccr.c b/soccr/soccr.c
index 36b38870f..130f604ea 100644
--- a/soccr/soccr.c
+++ b/soccr/soccr.c
@@ -1,5 +1,6 @@
 #include <netinet/tcp.h>
 #include <stdlib.h>
+#include <string.h>
 #include "soccr.h"
 
 static void (*log)(unsigned int loglevel, const char *format, ...)
@@ -61,3 +62,18 @@ void libsoccr_resume(struct libsoccr_sk *sk)
 	tcp_repair_off(sk->fd);
 	free(sk);
 }
+
+/*
+ * This is how much data we've had in the initial libsoccr
+ */
+#define SOCR_DATA_MIN_SIZE	(16 * sizeof(__u32))
+
+int libsoccr_get_sk_data(struct libsoccr_sk *sk, struct libsoccr_sk_data *data, unsigned data_size)
+{
+	if (!data || data_size < SOCR_DATA_MIN_SIZE)
+		return -1;
+
+	memset(data, 0, data_size);
+
+	return sizeof(struct libsoccr_sk_data);
+}
diff --git a/soccr/soccr.h b/soccr/soccr.h
index f5bdd18d5..a55d01e50 100644
--- a/soccr/soccr.h
+++ b/soccr/soccr.h
@@ -11,7 +11,45 @@ void libsoccr_set_log(unsigned int level, void (*fn)(unsigned int level, const c
 
 struct libsoccr_sk;
 
+struct libsoccr_sk_data {
+	__u32	inq_len;
+	__u32	inq_seq;
+	__u32	outq_len;
+	__u32	outq_seq;
+	__u32	unsq_len;
+	__u32	opt_mask;
+	__u32	mss_clamp;
+	__u32	snd_wscale;
+	__u32	rcv_wscale;
+	__u32	timestamp;
+
+	__u32	flags; /* SOCCR_FLAGS_... below */
+	__u32	snd_wl1;
+	__u32	snd_wnd;
+	__u32	max_window;
+	__u32	rcv_wnd;
+	__u32	rcv_wup;
+};
+
+/*
+ * The flags below denote which data on libsoccr_sk_data was get
+ * from the kernel and is required for restore. Not present data
+ * is zeroified by the library.
+ *
+ * Ideally the caller should carry the whole _data structure between 
+ * calls, but for optimization purposes it may analyze the flags
+ * field and drop the unneeded bits.
+ */
+
+/*
+ * Window parameters. Mark snd_wl1, snd_wnd, max_window, rcv_wnd
+ * and rcv_wup fields.
+ */
+#define SOCCR_FLAGS_WINDOW	0x1
+
 struct libsoccr_sk *libsoccr_pause(int fd);
 void libsoccr_resume(struct libsoccr_sk *sk);
 
+int libsoccr_get_sk_data(struct libsoccr_sk *sk, struct libsoccr_sk_data *data, unsigned data_size);
+
 #endif