[CRIU] [PATCH 06/12] kdat: Config for socket netns

[Pavel Emelyanov]

Whether or not kernel support ioctl to get socket ns
can be defined compile time.

Signed-off-by: Pavel Emelyanov <xemul at virtuozzo.com>
---
 criu/cr-check.c        | 10 +++-------
 criu/include/sockets.h |  2 +-
 criu/kerndat.c         | 21 +++++++++++++++++++++
 criu/net.c             |  7 ++-----
 4 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/criu/cr-check.c b/criu/cr-check.c
index fbd566e..503ff2f 100644
--- a/criu/cr-check.c
+++ b/criu/cr-check.c
@@ -1101,13 +1101,9 @@ static int check_uffd(void)
 
 static int check_sk_netns(void)
 {
-	if (kerndat_socket_netns() < 0)
-		return -1;
-
-	if (!kdat.sk_ns)
-		return -1;
-
-	return 0;
+	int ret;
+	ret = socket_has_netns();
+	return ret > 0 ? 0 : -1;
 }
 
 static int (*chk_feature)(void);
diff --git a/criu/include/sockets.h b/criu/include/sockets.h
index 93f9ca3..afd3c6c 100644
--- a/criu/include/sockets.h
+++ b/criu/include/sockets.h
@@ -88,6 +88,6 @@ extern int set_netns(uint32_t ns_id);
 #define SIOCGSKNS      0x894C          /* get socket network namespace */
 #endif
 
-extern int kerndat_socket_netns(void);
+extern int socket_has_netns(void);
 
 #endif /* __CR_SOCKETS_H__ */
diff --git a/criu/kerndat.c b/criu/kerndat.c
index 46b9bd7..a904e84 100644
--- a/criu/kerndat.c
+++ b/criu/kerndat.c
@@ -665,6 +665,27 @@ int kerndat_uffd(bool need_uffd)
 	return 0;
 }
 
+#ifdef CONFIG_KERNEL_SOCK_NETNS
+static inline int kerndat_socket_netns(void)
+{
+	kdat.sk_ns = CONFIG_KERNEL_SOCK_NETNS;
+	return 0;
+}
+#else
+static int kerndat_socket_netns(void)
+{
+	int ret;
+
+	ret = socket_has_netns();
+	if (ret > 0) {
+		kdat.sk_ns = true;
+		ret = 0;
+	}
+
+	return ret;
+}
+#endif
+
 int kerndat_init(void)
 {
 	int ret;
diff --git a/criu/net.c b/criu/net.c
index b423000..9876ef4 100644
--- a/criu/net.c
+++ b/criu/net.c
@@ -2483,7 +2483,7 @@ struct ns_id *get_socket_ns(int lfd)
 	return ns;
 }
 
-int kerndat_socket_netns(void)
+int socket_has_netns(void)
 {
 	int sk, ns_fd;
 
@@ -2495,16 +2495,13 @@ int kerndat_socket_netns(void)
 	ns_fd = ioctl(sk, SIOCGSKNS);
 	if (ns_fd < 0) {
 		pr_warn("Unable to get a socket network namespace\n");
-		kdat.sk_ns = false;
 		close(sk);
 		return 0;
 	}
 	close(sk);
 	close(ns_fd);
 
-	kdat.sk_ns = true;
-
-	return 0;
+	return 1;
 }
 
 static int move_to_bridge(struct external *ext, void *arg)
-- 
2.5.5