Common tree insert function for QUIC and UDP connections. Previously, ngx_udp_rbtree_insert_value() was used for plain UDP and ngx_quic_rbtree_insert_value() was used for QUIC. Because of this it was impossible to initialize connection tree in ngx_create_listening() since this function is not aware what kind of listening it creates. Now ngx_udp_rbtree_insert_value() is used for both QUIC and UDP. To make is possible, a generic key field is added to ngx_udp_connection_t. It keeps client address for UDP and connection ID for QUIC.

--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -1883,14 +1883,7 @@ ngx_http_add_listening(ngx_conf_t *cf, n
     ls->wildcard = addr->opt.wildcard;
 
 #if (NGX_HTTP_V3)
-
     ls->quic = addr->opt.quic;
-
-    if (ls->quic) {
-        ngx_rbtree_init(&ls->rbtree, &ls->sentinel,
-                        ngx_quic_rbtree_insert_value);
-    }
-
 #endif
 
     return ls;