netns: Ifaddrs dump and restore

Just run the ip addr save and ip addr restore respectively.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

image.c

@@ -119,6 +119,7 @@ struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX] = {
 	FD_ENTRY(TCP_STREAM,	"tcp-stream-%x", show_tcp_stream),
 	FD_ENTRY(MOUNTPOINTS,	"mountpoints-%d", show_mountpoints),
 	FD_ENTRY(NETDEV,	"netdev-%d",	 show_netdevices),
+	FD_ENTRY(IFADDR,	"ifaddr-%d",	 show_ifaddrs),
 };
 
 static struct cr_fdset *alloc_cr_fdset(int nr)

include/crtools.h

@@ -47,6 +47,7 @@ enum {
 	CR_FD_IPCNS_SEM,
 	CR_FD_MOUNTPOINTS,
 	CR_FD_NETDEV,
+	CR_FD_IFADDR,
 	_CR_FD_NS_TO,
 
 	CR_FD_PSTREE,

include/image.h

@@ -58,6 +58,8 @@
 #define MOUNTPOINTS_MAGIC	0x55563928 /* Petushki */
 #define NETDEV_MAGIC		0x57373951 /* Yaroslavl */
 
+#define IFADDR_MAGIC		RAW_IMAGE_MAGIC
+
 #define PAGE_IMAGE_SIZE	4096
 #define PAGE_RSS	1
 #define PAGE_ANON	2

include/net.h

@@ -2,6 +2,7 @@
 #define __CR_NET_H__
 struct cr_options;
 void show_netdevices(int fd, struct cr_options *);
+void show_ifaddrs(int fd, struct cr_options *);
 
 struct cr_fdset;
 int dump_net_ns(int pid, struct cr_fdset *);

net.c

@@ -170,7 +170,7 @@ static int restore_links(int pid)
 	return ret;
 }
 
-int run_ip_tool(char *arg1, char *arg2, int fdin, int fdout)
+static int run_ip_tool(char *arg1, char *arg2, int fdin, int fdout)
 {
 	int pid, ret, status;
 
@@ -227,6 +227,35 @@ int run_ip_tool(char *arg1, char *arg2, int fdin, int fdout)
 	return 0;
 }
 
+static inline int dump_ifaddr(struct cr_fdset *fds)
+{
+	return run_ip_tool("addr", "save", -1, fdset_fd(fds, CR_FD_IFADDR));
+}
+
+static int restore_ip_dump(int type, int pid, char *cmd)
+{
+	int fd, ret;
+
+	ret = fd = open_image_ro(type, pid);
+	if (fd > 0) {
+		ret = run_ip_tool(cmd, "restore", fd, -1);
+		close(fd);
+	}
+
+	return ret;
+}
+
+static inline int restore_ifaddr(int pid)
+{
+	return restore_ip_dump(CR_FD_IFADDR, pid, "addr");
+}
+
+void show_ifaddrs(int fd, struct cr_options *o)
+{
+	BUG_ON(1);
+}
+
+
 int dump_net_ns(int pid, struct cr_fdset *fds)
 {
 	int ret;
@@ -234,6 +263,8 @@ int dump_net_ns(int pid, struct cr_fdset *fds)
 	ret = switch_ns(pid, CLONE_NEWNET, "net", NULL);
 	if (!ret)
 		ret = dump_links(fds);
+	if (!ret)
+		ret = dump_ifaddr(fds);
 
 	return ret;
 }
@@ -243,6 +274,8 @@ int prepare_net_ns(int pid)
 	int ret;
 
 	ret = restore_links(pid);
+	if (!ret)
+		ret = restore_ifaddr(pid);
 
 	return ret;
 }