mgw: Find and store RTP conn local_addr once during CRCX handling
It doesn't make sense to call the function several times since anyway we
are only binding during
allocate_port()->mgcp_bind_net_rtp_port()->bind_rtp()->mgcp_create_bind()->osmo_sock_init2().
Let's better calculate the local IP addr once and use that stored value.
THis is a previous step towards next commit updating the local IP addr
and re-bindng if encessary.
Change-Id: I803b99c5e5fe0f92a5bf6796d8c25df88d1608e6
diff --git a/src/libosmo-mgcp/mgcp_protocol.c b/src/libosmo-mgcp/mgcp_protocol.c
index 1269524..1e7ccbf 100644
--- a/src/libosmo-mgcp/mgcp_protocol.c
+++ b/src/libosmo-mgcp/mgcp_protocol.c
@@ -223,24 +223,22 @@
const char *trans_id,
bool add_conn_params)
{
- /* TODO: we may want to define another local_ip_osmux var to us for
- OSMUX connections. Perhaps adding a new internal API to get it based
- on conn type */
- const char *addr = endp->cfg->local_ip;
+ /* cfg->local_ip allows overwritting the announced IP address with
+ * regards to the one we actually bind to. Useful in behind-NAT
+ * scenarios.
+ * TODO: we may want to define another local_ip_osmux var to
+ * us for OSMUX connections. Perhaps adding a new internal API to get it
+ * based on conn type.
+ */
+ const char *addr = endp->cfg->local_ip ? : conn->end.local_addr;
struct msgb *sdp;
int rc;
struct msgb *result;
- char local_ip_addr[INET6_ADDRSTRLEN];
sdp = msgb_alloc_headroom(4096, 128, "sdp record");
if (!sdp)
return NULL;
- if (!addr) {
- mgcp_get_local_addr(local_ip_addr, conn);
- addr = local_ip_addr;
- }
-
/* Attach optional connection parameters */
if (add_conn_params) {
rc = add_params(sdp, endp, conn);
@@ -943,6 +941,9 @@
goto error2;
}
+ /* Find a local address for conn based on policy and initial SDP remote
+ information, then find a free port for it */
+ mgcp_get_local_addr(conn->end.local_addr, conn);
if (allocate_port(endp, conn) != 0) {
rate_ctr_inc(&rate_ctrs->ctr[MGCP_CRCX_FAIL_BIND_PORT]);
goto error2;