natd(8) will work with an unconfigured interface and effectively not do

anything until the interface is assigned an address.  This fixes
ipfw_nat to do the same by using an IP of INADDR_ANY instead of
aborting the nat setup if the requested interface is not yet configured.

Differential Revision:	https://reviews.freebsd.org/D1539
Reviewed by:	melifaro, glebius, gnn
MFC after:	1 week

1 files changed, 3 insertions, 3 deletions

diff --git a/sbin/ipfw/nat.c b/sbin/ipfw/nat.c
index 3bd0259..4391778 100644
--- a/sbin/ipfw/nat.c
+++ b/sbin/ipfw/nat.c
@@ -163,9 +163,9 @@ set_addr_dynamic(const char *ifn, struct nat44_cfg_nat *n)
 		}
 	}
 	if (sin == NULL)
-		errx(1, "%s: cannot get interface address", ifn);
-
-	n->ip = sin->sin_addr;
+		n->ip.s_addr = htonl(INADDR_ANY);
+	else
+		n->ip = sin->sin_addr;
 	strncpy(n->if_name, ifn, IF_NAMESIZE);
 
 	free(buf);