net: create a list of all links

We will need to enumirate links a few times
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>

criu/include/net.h

@@ -38,7 +38,8 @@ extern struct ns_desc net_ns_desc;
 #include "images/netdev.pb-c.h"
 extern int write_netdev_img(NetDeviceEntry *nde, struct cr_imgset *fds, struct nlattr **info);
 extern int read_ns_sys_file(char *path, char *buf, int len);
-extern int restore_link_parms(NetDeviceEntry *nde, int nlsk);
+struct net_link;
+extern int restore_link_parms(struct net_link *link, int nlsk);
 
 extern int veth_pair_add(char *in, char *out);
 extern int macvlan_ext_add(struct external *ext);

criu/include/tun.h

@@ -11,7 +11,8 @@
 
 extern const struct fdtype_ops tunfile_dump_ops;
 extern int dump_tun_link(NetDeviceEntry *nde, struct cr_imgset *fds, struct nlattr **info);
-extern int restore_one_tun(NetDeviceEntry *nde, int nlsk);
+struct net_link;
+extern int restore_one_tun(struct net_link *link, int nlsk);
 extern struct collect_image_info tunfile_cinfo;
 extern int check_tun_cr(int no_tun_err);
 

criu/tun.c

@@ -439,8 +439,9 @@ int dump_tun_link(NetDeviceEntry *nde, struct cr_imgset *fds, struct nlattr **in
 	return write_netdev_img(nde, fds, info);
 }
 
-int restore_one_tun(NetDeviceEntry *nde, int nlsk)
+int restore_one_tun(struct net_link *link, int nlsk)
 {
+	NetDeviceEntry *nde = link->nde;
 	int fd, ret = -1, aux;
 
 	if (!nde->tun) {
@@ -489,7 +490,7 @@ int restore_one_tun(NetDeviceEntry *nde, int nlsk)
 		goto out;
 	}
 
-	if (restore_link_parms(nde, nlsk)) {
+	if (restore_link_parms(link, nlsk)) {
 		pr_err("Error restoring %s link params\n", nde->name);
 		goto out;
 	}