conf, tap: Split netlink and pasta functions, allow interface configuration

Move netlink routines to their own file, and use netlink to configure
or fetch all the information we need, except for the TUNSETIFF ioctl.

Move pasta-specific functions to their own file as well, add
parameters and calls to configure the tap interface in the namespace.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/passt.h b/passt.h
index 4cce092..50e33a3 100644
--- a/passt.h
+++ b/passt.h
@@ -113,8 +113,10 @@ enum passt_modes {
  * @addr6_ll_seen:	Latest IPv6 link-local address seen as source from tap
  * @gw6:		Default IPv6 gateway
  * @dns4:		IPv4 DNS addresses, zero-terminated
- * @ifn:		Name of routable interface
+ * @ifi:		Index of routable interface
  * @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
  * @no_tcp:		Disable TCP operation
  * @tcp:		Context for TCP protocol handler
  * @no_tcp:		Disable UDP operation
@@ -167,8 +169,10 @@ struct ctx {
 	struct in6_addr gw6;
 	struct in6_addr dns6[MAXNS + 1];
 
-	char ifn[IF_NAMESIZE];
+	unsigned int ifi;
 	char pasta_ifn[IF_NAMESIZE];
+	unsigned int pasta_ifi;
+	int pasta_conf_ns;
 
 	int no_tcp;
 	struct tcp_ctx tcp;