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

Use the newly-introduced NL_DUP mode for nl_addr() to copy all the
addresses associated to the template interface in the outer
namespace, unless --no-copy-addrs (also implied by -a) 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.

This is done mostly for consistency with routes. It might partially
cover the issue at:
  https://bugs.passt.top/show_bug.cgi?id=47
  Support multiple addresses per address family

for some use cases, but not the originally intended one: we'll still
use a single outbound address (unless the routing table specifies
different preferred source addresses depending on the destination),
regardless of the address used in the target namespace.

Link: https://bugs.passt.top/show_bug.cgi?id=47
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/passt.h b/passt.h
index d314596..b51a1e5 100644
--- a/passt.h
+++ b/passt.h
@@ -183,6 +183,7 @@ struct ip6_ctx {
  * @pasta_ifn:		Index of namespace interface for pasta
  * @pasta_conf_ns:	Configure namespace after creating it
  * @no_copy_routes:	Don't copy all routes when configuring target namespace
+ * @no_copy_addrs:	Don't copy all addresses when configuring namespace
  * @no_tcp:		Disable TCP operation
  * @tcp:		Context for TCP protocol handler
  * @no_tcp:		Disable UDP operation
@@ -242,6 +243,7 @@ struct ctx {
 	unsigned int pasta_ifi;
 	int pasta_conf_ns;
 	int no_copy_routes;
+	int no_copy_addrs;
 
 	int no_tcp;
 	struct tcp_ctx tcp;