Proper/additional check of tcp_no_new_conn_bflag

Check the tcp_no_new_conn_bflag (to avoid opening TCP conns) when:
* sending a cancel to an invite (which was marked)
* sending a negative ACK to an invite (which was marked)
* sending an local UAC request (marked via local route)

modules/tm/t_cancel.c

@@ -110,13 +110,16 @@ void cancel_branch( struct cell *t, int branch )
 	crb->activ_type=TYPE_LOCAL_CANCEL;
 
 	LM_DBG("sending cancel...\n");
+	if (t->uac[branch].br_flags & tcp_no_new_conn_bflag)
+		tcp_no_new_conn = 1;
 	if (SEND_BUFFER( crb )==0) {
 		if ( has_tran_tmcbs( t, TMCB_REQUEST_BUILT|TMCB_MSG_SENT_OUT) ) {
 			set_extra_tmcb_params( &crb->buffer, &crb->dst);
 			run_trans_callbacks( TMCB_REQUEST_BUILT|TMCB_MSG_SENT_OUT,
 				t, t->uas.request, 0, 0);
 		}
 	}
+	tcp_no_new_conn = 0;
 
 	/*sets and starts the FINAL RESPONSE timer */
 	start_retr( crb );

modules/tm/t_reply.c

@@ -310,6 +310,9 @@ static int send_ack(struct sip_msg* rpl, struct cell *trans, int branch)
 		goto error;
 	}
 
+	if (trans->uac[branch].br_flags & tcp_no_new_conn_bflag)
+		tcp_no_new_conn = 1;
+
 	if(SEND_PR_BUFFER(&trans->uac[branch].request, ack_buf.s, ack_buf.len)==0){
 		/* successfully sent out */
 		if ( has_tran_tmcbs( trans, TMCB_MSG_SENT_OUT) ) {
@@ -319,6 +322,8 @@ static int send_ack(struct sip_msg* rpl, struct cell *trans, int branch)
 		}
 	}
 
+	tcp_no_new_conn = 0;
+
 	shm_free(ack_buf.s);
 
 	return 0;

modules/tm/uac.c

@@ -471,12 +471,17 @@ int t_uac(str* method, str* headers, str* body, dlg_t* dialog,
 		REF_UNSAFE(new_cell);
 	}
 
+	if (new_cell->uac[0].br_flags & tcp_no_new_conn_bflag)
+		tcp_no_new_conn = 1;
+
 	if (SEND_BUFFER(request) == -1) {
 		LM_ERR("attempt to send to '%.*s' failed\n",
 			dialog->hooks.next_hop->len,
 			dialog->hooks.next_hop->s);
 	}
 
+	tcp_no_new_conn = 0;
+
 	if (method->len==ACK_LEN && memcmp(method->s, ACK, ACK_LEN)==0 ) {
 		t_release_transaction(new_cell);
 	} else {