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nat: Handle unknown RLSD by send a RLC back to the network.

This commit is contained in:
Holger Hans Peter Freyther 2010-04-08 11:28:12 +02:00
parent 0176eb44f5
commit b8a337356a
1 changed files with 31 additions and 1 deletions
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32
openbsc/src/nat/bsc_nat.c
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@ -153,6 +153,32 @@ static void nat_send_rlsd(struct sccp_connections *conn)
}
}
static void nat_send_rlc(struct sccp_source_reference *src,
struct sccp_source_reference *dst)
{
struct sccp_connection_release_complete *rlc;
struct msgb *msg;
msg = msgb_alloc_headroom(4096, 128, "rlc");
if (!msg) {
LOGP(DNAT, LOGL_ERROR, "Failed to allocate clear command.\n");
return;
}
msg->l2h = msgb_put(msg, sizeof(*rlc));
rlc = (struct sccp_connection_release_complete *) msg->l2h;
rlc->type = SCCP_MSG_TYPE_RLC;
rlc->destination_local_reference = *dst;
rlc->source_local_reference = *src;
ipaccess_prepend_header(msg, IPAC_PROTO_SCCP);
if (write_queue_enqueue(&msc_con->write_queue, msg) != 0) {
LOGP(DINP, LOGL_ERROR, "Failed to enqueue the write.\n");
msgb_free(msg);
}
}
static void send_mgcp_reset(struct bsc_connection *bsc)
{
static const u_int8_t mgcp_reset[] = {
@ -254,7 +280,11 @@ static int forward_sccp_to_bts(struct msgb *msg)
goto exit;
}
if (!con)
if (!con && parsed->sccp_type == SCCP_MSG_TYPE_RLSD) {
LOGP(DNAT, LOGL_NOTICE, "Sending fake RLC on RLSD message to network.\n");
/* Exchange src/dest for the reply */
nat_send_rlc(parsed->dest_local_ref, parsed->src_local_ref);
} else if (!con)
LOGP(DNAT, LOGL_ERROR, "Unknown connection for msg type: 0x%x.\n", parsed->sccp_type);
}