Configurable transport parameters.

 - integer parameters can be configured using the following directives:

    quic_max_idle_timeout
    quic_max_ack_delay
    quic_max_packet_size
    quic_initial_max_data
    quic_initial_max_stream_data_bidi_local
    quic_initial_max_stream_data_bidi_remote
    quic_initial_max_stream_data_uni
    quic_initial_max_streams_bidi
    quic_initial_max_streams_uni
    quic_ack_delay_exponent
    quic_active_migration
    quic_active_connection_id_limit

 - only following parameters are actually sent:

    active_connection_id_limit
    initial_max_streams_uni
    initial_max_streams_bidi
    initial_max_stream_data_bidi_local
    initial_max_stream_data_bidi_remote
    initial_max_stream_data_uni

 (other parameters are to be added into ngx_quic_create_transport_params()
  function as needed, should be easy now)

 - draft 24 and draft 27 are now supported
   (at compile-time using quic_version macro)

1 files changed, 180 insertions, 2 deletions

diff --git a/src/http/v3/ngx_http_v3_module.c b/src/http/v3/ngx_http_v3_module.c
index af310bd44..6d3f34d41 100644
--- a/src/http/v3/ngx_http_v3_module.c
+++ b/src/http/v3/ngx_http_v3_module.c
@@ -11,10 +11,100 @@
 
 
 static ngx_command_t  ngx_http_v3_commands[] = {
+
+    { ngx_string("quic_max_idle_timeout"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_msec_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.max_idle_timeout),
+      NULL },
+
+    { ngx_string("quic_max_ack_delay"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_msec_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.max_ack_delay),
+      NULL },
+
+    { ngx_string("quic_max_packet_size"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.max_packet_size),
+      NULL },
+
+    { ngx_string("quic_initial_max_data"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.initial_max_data),
+      NULL },
+
+    { ngx_string("quic_initial_max_stream_data_bidi_local"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.initial_max_stream_data_bidi_local),
+      NULL },
+
+    { ngx_string("quic_initial_max_stream_data_bidi_remote"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.initial_max_stream_data_bidi_remote),
+      NULL },
+
+    { ngx_string("quic_initial_max_stream_data_uni"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.initial_max_stream_data_uni),
+      NULL },
+
+    { ngx_string("quic_initial_max_streams_bidi"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.initial_max_streams_bidi),
+      NULL },
+
+    { ngx_string("quic_initial_max_streams_uni"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.initial_max_streams_uni),
+      NULL },
+
+    { ngx_string("quic_ack_delay_exponent"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.ack_delay_exponent),
+      NULL },
+
+    { ngx_string("quic_active_migration"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.disable_active_migration),
+      NULL },
+
+    { ngx_string("quic_active_connection_id_limit"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      NGX_HTTP_SRV_CONF_OFFSET,
+      offsetof(ngx_http_v3_srv_conf_t, quic.active_connection_id_limit),
+      NULL },
+
       ngx_null_command
 };
 
 
+static void *ngx_http_v3_create_srv_conf(ngx_conf_t *cf);
+static char *ngx_http_v3_merge_srv_conf(ngx_conf_t *cf,
+    void *parent, void *child);
+
+
 static ngx_http_module_t  ngx_http_v3_module_ctx = {
     NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
@@ -22,8 +112,8 @@ static ngx_http_module_t  ngx_http_v3_module_ctx = {
     NULL,                                  /* create main configuration */
     NULL,                                  /* init main configuration */
 
-    NULL,                                  /* create server configuration */
-    NULL,                                  /* merge server configuration */
+    ngx_http_v3_create_srv_conf,           /* create server configuration */
+    ngx_http_v3_merge_srv_conf,            /* merge server configuration */
 
     NULL,                                  /* create location configuration */
     NULL                                   /* merge location configuration */
@@ -44,3 +134,91 @@ ngx_module_t  ngx_http_v3_module = {
     NULL,                                  /* exit master */
     NGX_MODULE_V1_PADDING
 };
+
+
+static void *
+ngx_http_v3_create_srv_conf(ngx_conf_t *cf)
+{
+    ngx_http_v3_srv_conf_t  *v3cf;
+
+    v3cf = ngx_pcalloc(cf->pool, sizeof(ngx_http_v3_srv_conf_t));
+    if (v3cf == NULL) {
+        return NULL;
+    }
+
+    /*
+     * set by ngx_pcalloc():
+     *  v3cf->quic.original_connection_id = 0;
+     *  v3cf->quic.stateless_reset_token = { 0 }
+     *  conf->quic.preferred_address = NULL
+     */
+
+    v3cf->quic.max_idle_timeout = NGX_CONF_UNSET_MSEC;
+    v3cf->quic.max_ack_delay = NGX_CONF_UNSET_MSEC;
+
+    v3cf->quic.max_packet_size = NGX_CONF_UNSET_UINT;
+    v3cf->quic.initial_max_data = NGX_CONF_UNSET_UINT;
+    v3cf->quic.initial_max_stream_data_bidi_local = NGX_CONF_UNSET_UINT;
+    v3cf->quic.initial_max_stream_data_bidi_remote = NGX_CONF_UNSET_UINT;
+    v3cf->quic.initial_max_stream_data_uni = NGX_CONF_UNSET_UINT;
+    v3cf->quic.initial_max_streams_bidi = NGX_CONF_UNSET_UINT;
+    v3cf->quic.initial_max_streams_uni = NGX_CONF_UNSET_UINT;
+    v3cf->quic.ack_delay_exponent = NGX_CONF_UNSET_UINT;
+    v3cf->quic.disable_active_migration = NGX_CONF_UNSET_UINT;
+    v3cf->quic.active_connection_id_limit = NGX_CONF_UNSET_UINT;
+
+    return v3cf;
+}
+
+
+static char *
+ngx_http_v3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
+{
+    ngx_http_v3_srv_conf_t *prev = parent;
+    ngx_http_v3_srv_conf_t *conf = child;
+
+    ngx_conf_merge_msec_value(conf->quic.max_idle_timeout,
+                              prev->quic.max_idle_timeout, 10000);
+
+    // > 2 ^ 14 is invalid
+    ngx_conf_merge_msec_value(conf->quic.max_ack_delay,
+                              prev->quic.max_ack_delay, 25);
+
+    // < 1200 is invalid
+    ngx_conf_merge_uint_value(conf->quic.max_packet_size,
+                              prev->quic.max_packet_size, 65527);
+
+    ngx_conf_merge_uint_value(conf->quic.initial_max_data,
+                              prev->quic.initial_max_data, 10000000);
+
+    ngx_conf_merge_uint_value(conf->quic.initial_max_stream_data_bidi_local,
+                              prev->quic.initial_max_stream_data_bidi_local,
+                              255);
+
+    ngx_conf_merge_uint_value(conf->quic.initial_max_stream_data_bidi_remote,
+                              prev->quic.initial_max_stream_data_bidi_remote,
+                              255);
+
+    ngx_conf_merge_uint_value(conf->quic.initial_max_stream_data_uni,
+                              prev->quic.initial_max_stream_data_uni, 255);
+
+    ngx_conf_merge_uint_value(conf->quic.initial_max_streams_bidi,
+                              prev->quic.initial_max_streams_bidi, 16);
+
+    ngx_conf_merge_uint_value(conf->quic.initial_max_streams_uni,
+                              prev->quic.initial_max_streams_uni, 16);
+
+    // > 20 is invalid
+    ngx_conf_merge_uint_value(conf->quic.ack_delay_exponent,
+                              prev->quic.ack_delay_exponent, 3);
+
+    ngx_conf_merge_uint_value(conf->quic.disable_active_migration,
+                              prev->quic.disable_active_migration, 1);
+
+    // < 2 is invalid
+    ngx_conf_merge_uint_value(conf->quic.active_connection_id_limit,
+                              prev->quic.active_connection_id_limit, 2);
+
+    return NGX_CONF_OK;
+}
+