interface: allow renaming interface when moving to jail netns

Introduce jail_ifname option to define the name of a Linux network
interface when moved into a jail's network namespace.
This is useful for containers which expect the network interface to
have a specific name (eg. 'host0' in case of systemd).
While at it, clean-up and fix bugs in jail interface up/down routines.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/ubus.c b/ubus.c
index 85d834d..15c826b 100644
--- a/ubus.c
+++ b/ubus.c
@@ -765,6 +765,9 @@ netifd_dump_status(struct interface *iface)
 	if (iface->jail)
 		blobmsg_add_string(&b, "jail", iface->jail);
 
+	if (iface->jail_ifname)
+		blobmsg_add_string(&b, "jail_ifname", iface->jail_ifname);
+
 	if (iface->state == IFS_UP) {
 		if (iface->updated) {
 			a = blobmsg_open_array(&b, "updated");