[nat] Add a token to the nat config and handle ID GET
This allows to chain a nat with a nat by answering to the
id get code and sending the token.
diff --git a/openbsc/src/nat/bsc_nat.c b/openbsc/src/nat/bsc_nat.c
index 4a0a15b..daed239 100644
--- a/openbsc/src/nat/bsc_nat.c
+++ b/openbsc/src/nat/bsc_nat.c
@@ -260,6 +260,16 @@
msc_send_reset(nat->msc_con);
}
+static void send_id_get_response()
+{
+ struct msgb *msg = bsc_msc_id_get_resp(nat->token);
+ if (!msg)
+ return;
+
+ ipaccess_prepend_header(msg, IPAC_PROTO_IPACCESS);
+ queue_for_msc(nat->msc_con, msg);
+}
+
/*
* Currently we are lacking refcounting so we need to copy each message.
*/
@@ -455,9 +465,12 @@
ipaccess_rcvmsg_base(msg, bfd);
/* initialize the networking. This includes sending a GSM08.08 message */
- if (hh->proto == IPAC_PROTO_IPACCESS && msg->l2h[0] == IPAC_MSGT_ID_ACK)
- initialize_msc_if_needed();
- else if (hh->proto == IPAC_PROTO_SCCP)
+ if (hh->proto == IPAC_PROTO_IPACCESS) {
+ if (msg->l2h[0] == IPAC_MSGT_ID_ACK)
+ initialize_msc_if_needed();
+ else if (msg->l2h[0] == IPAC_MSGT_ID_GET)
+ send_id_get_response();
+ } else if (hh->proto == IPAC_PROTO_SCCP)
forward_sccp_to_bts(msg);
msgb_free(msg);