mgcp: Count the received octets as of the MGCP specification

Count the received octets. This is encouraged by the MGCP specification.
Use a 32bit counter that is good enough for more than 12 hours of a EFR
call. This limit is good enough for the current configuration.

openbsc/include/openbsc/mgcp_internal.h

@@ -55,6 +55,7 @@ struct mgcp_rtp_state {
 struct mgcp_rtp_end {
 	/* statistics */
 	unsigned int packets;
+	unsigned int octets;
 	struct in_addr addr;
 
 	/* in network byte order */

openbsc/src/libmgcp/mgcp_network.c

@@ -296,6 +296,7 @@ static int rtp_data_net(struct osmo_fd *fd, unsigned int what)
 
 	proto = fd == &endp->net_end.rtp ? PROTO_RTP : PROTO_RTCP;
 	endp->net_end.packets += 1;
+	endp->net_end.octets += rc;
 
 	forward_data(fd->fd, &endp->taps[MGCP_TAP_NET_IN], buf, rc);
 	if (endp->is_transcoded)
@@ -374,6 +375,7 @@ static int rtp_data_bts(struct osmo_fd *fd, unsigned int what)
 
 	/* do this before the loop handling */
 	endp->bts_end.packets += 1;
+	endp->bts_end.octets += rc;
 
 	forward_data(fd->fd, &endp->taps[MGCP_TAP_BTS_IN], buf, rc);
 	if (endp->is_transcoded)

openbsc/src/libmgcp/mgcp_protocol.c

@@ -897,6 +897,7 @@ static void mgcp_rtp_end_reset(struct mgcp_rtp_end *end)
 	}
 
 	end->packets = 0;
+	end->octets = 0;
 	memset(&end->addr, 0, sizeof(end->addr));
 	end->rtp_port = end->rtcp_port = 0;
 	end->payload_type = -1;