conf, pasta: With --config-net, copy all routes by default

Use the newly-introduced NL_DUP mode for nl_route() to copy all the
routes associated to the template interface in the outer namespace,
unless --no-copy-routes (also implied by -g) is given.

This option is introduced as deprecated right away: it's not expected
to be of any use, but it's helpful to keep it around for a while to
debug any suspected issue with this change.

Otherwise, we can't use default gateways which are not, address-wise,
on the same subnet as the container, as reported by Callum.

Reported-by: Callum Parsey <callum@neoninteger.au>
Link: https://github.com/containers/podman/issues/18539
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 3 insertions, 1 deletions

diff --git a/passt.h b/passt.h
index 73fe808..d314596 100644
--- a/passt.h
+++ b/passt.h
@@ -181,7 +181,8 @@ struct ip6_ctx {
  * @ip6:		IPv6 configuration
  * @pasta_ifn:		Name of namespace interface for pasta
  * @pasta_ifn:		Index of namespace interface for pasta
- * @pasta_conf_ns:	Configure namespace interface after creating it
+ * @pasta_conf_ns:	Configure namespace after creating it
+ * @no_copy_routes:	Don't copy all routes when configuring target namespace
  * @no_tcp:		Disable TCP operation
  * @tcp:		Context for TCP protocol handler
  * @no_tcp:		Disable UDP operation
@@ -240,6 +241,7 @@ struct ctx {
 	char pasta_ifn[IF_NAMESIZE];
 	unsigned int pasta_ifi;
 	int pasta_conf_ns;
+	int no_copy_routes;
 
 	int no_tcp;
 	struct tcp_ctx tcp;