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changeset 8883:404de224517e quic

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QUIC: limited the total number of frames. Exceeding 10000 allocated frames is considered a flood.
author Roman Arutyunyan <arut@nginx.com>
date Wed, 13 Oct 2021 14:46:51 +0300
parents 6204120cf37f
children 1798acc01970
files src/event/quic/ngx_event_quic_connection.h src/event/quic/ngx_event_quic_frames.c
diffstat 2 files changed, 7 insertions(+), 3 deletions(-) [+]
line wrap: on
line diff
--- a/src/event/quic/ngx_event_quic_connection.h
+++ b/src/event/quic/ngx_event_quic_connection.h
@@ -228,8 +228,8 @@ struct ngx_quic_connection_s {
     ngx_chain_t                      *free_bufs;
     ngx_buf_t                        *free_shadow_bufs;
 
+    ngx_uint_t                        nframes;
 #ifdef NGX_QUIC_DEBUG_ALLOC
-    ngx_uint_t                        nframes;
     ngx_uint_t                        nbufs;
 #endif
 
--- a/src/event/quic/ngx_event_quic_frames.c
+++ b/src/event/quic/ngx_event_quic_frames.c
@@ -38,18 +38,22 @@ ngx_quic_alloc_frame(ngx_connection_t *c
                        "quic reuse frame n:%ui", qc->nframes);
 #endif
 
-    } else {
+    } else if (qc->nframes < 10000) {
         frame = ngx_palloc(c->pool, sizeof(ngx_quic_frame_t));
         if (frame == NULL) {
             return NULL;
         }
 
-#ifdef NGX_QUIC_DEBUG_ALLOC
         ++qc->nframes;
 
+#ifdef NGX_QUIC_DEBUG_ALLOC
         ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
                        "quic alloc frame n:%ui", qc->nframes);
 #endif
+
+    } else {
+        ngx_log_error(NGX_LOG_INFO, c->log, 0, "quic flood detected");
+        return NULL;
     }
 
     ngx_memzero(frame, sizeof(ngx_quic_frame_t));