conf: Allow address remapped to host to be configured

Because the host and guest share the same IP address with passt/pasta, it's
not possible for the guest to directly address the host.  Therefore we
allow packets from the guest going to a special "NAT to host" address to be
redirected to the host, appearing there as though they have both source and
destination address of loopback.

Currently that special address is always the address of the default
gateway (or none).  That can be a problem if we want that gateway to be
addressable by the guest.  Therefore, allow the special "NAT to host"
address to be overridden on the command line with a new --map-host-loopback
option.

In order to exercise and test it, update the passt_in_ns and perf
tests to use this option and give different mapping addresses for the
two layers of the environment.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/test/run b/test/run
index 3b37663..cd6d707 100755
--- a/test/run
+++ b/test/run
@@ -101,7 +101,7 @@ run() {
 	VALGRIND=1
 	setup passt_in_ns
 	test passt/ndp
-	test passt/dhcp
+	test passt_in_ns/dhcp
 	test passt_in_ns/icmp
 	test passt_in_ns/tcp
 	test passt_in_ns/udp
@@ -115,7 +115,7 @@ run() {
 	VALGRIND=0
 	setup passt_in_ns
 	test passt/ndp
-	test passt/dhcp
+	test passt_in_ns/dhcp
 	test perf/passt_tcp
 	test perf/passt_udp
 	test perf/pasta_tcp