interface: support "zone" config option

Many protocol handlers support "zone" option independently and they pass
it in the "data". Then it's read e.g. by a firewall[34].

Add support for "zone" directly to the netifd so:
1. It works for all protocols
2. Handlers don't have to duplicate code

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 1 insertions, 0 deletions

diff --git a/interface.h b/interface.h
index 73a9070..9343ade 100644
--- a/interface.h
+++ b/interface.h
@@ -108,6 +108,7 @@ struct interface {
 
 	const char *name;
 	const char *device;
+	const char *zone;
 	char *jail;
 	char *jail_device;
 	char *host_device;