netlink, pasta: Fetch link-local address from namespace interface once it's up

As soon as we bring up the interface, the Linux kernel will set up a
link-local address for it, so we can fetch it and start using right
away, if we need a link-local address to communicate to the container
before we see any traffic coming from it.

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

1 files changed, 7 insertions, 0 deletions

diff --git a/pasta.c b/pasta.c
index 17eed15..e8883bd 100644
--- a/pasta.c
+++ b/pasta.c
@@ -340,6 +340,13 @@ void pasta_ns_conf(struct ctx *c)
 		}
 
 		if (c->ifi6) {
+			rc = nl_addr_get_ll(nl_sock_ns, c->pasta_ifi,
+					    &c->ip6.addr_ll_seen);
+			if (rc < 0) {
+				warn("Can't get LL address from namespace: %s",
+				    strerror(-rc));
+			}
+
 			rc = nl_addr_set_ll_nodad(nl_sock_ns, c->pasta_ifi);
 			if (rc < 0) {
 				warn("Can't set nodad for LL in namespace: %s",