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, 1 insertions, 0 deletions

diff --git a/interface.h b/interface.h
index cd09812..3d58aa3 100644
--- a/interface.h
+++ b/interface.h
@@ -109,6 +109,7 @@ struct interface {
 	const char *name;
 	const char *ifname;
 	char *jail;
+	char *jail_ifname;
 	int netns_fd;
 
 	bool available;