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feat: add http2 per iteration stream handling limit patch #82

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merged 1 commit into from
Oct 12, 2023
Merged

feat: add http2 per iteration stream handling limit patch #82

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53 changes: 53 additions & 0 deletions patch/1.21.4/nginx-http2_per_iteration_stream_handling_limit.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,53 @@
diff --git src/http/v2/ngx_http_v2.c src/http/v2/ngx_http_v2.c
index 3afa8b638..228b060bf 100644
--- src/http/v2/ngx_http_v2.c
+++ src/http/v2/ngx_http_v2.c
@@ -361,6 +361,7 @@ ngx_http_v2_read_handler(ngx_event_t *rev)
ngx_log_debug0(NGX_LOG_DEBUG_HTTP, c->log, 0, "http2 read handler");

h2c->blocked = 1;
+ h2c->new_streams = 0;

if (c->close) {
c->close = 0;
@@ -1321,6 +1322,14 @@ ngx_http_v2_state_headers(ngx_http_v2_connection_t *h2c, u_char *pos,
goto rst_stream;
}

+ if (h2c->new_streams++ >= 2 * h2scf->concurrent_streams) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent too many streams at once");
+
+ status = NGX_HTTP_V2_REFUSED_STREAM;
+ goto rst_stream;
+ }
+
if (!h2c->settings_ack
&& !(h2c->state.flags & NGX_HTTP_V2_END_STREAM_FLAG)
&& h2scf->preread_size < NGX_HTTP_V2_DEFAULT_WINDOW)
@@ -1386,6 +1395,12 @@ ngx_http_v2_state_headers(ngx_http_v2_connection_t *h2c, u_char *pos,

rst_stream:

+ if (h2c->refused_streams++ > ngx_max(h2scf->concurrent_streams, 100)) {
+ ngx_log_error(NGX_LOG_INFO, h2c->connection->log, 0,
+ "client sent too many refused streams");
+ return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_NO_ERROR);
+ }
+
if (ngx_http_v2_send_rst_stream(h2c, h2c->state.sid, status) != NGX_OK) {
return ngx_http_v2_connection_error(h2c, NGX_HTTP_V2_INTERNAL_ERROR);
}
diff --git src/http/v2/ngx_http_v2.h src/http/v2/ngx_http_v2.h
index 0eceae3d5..aef40bbb8 100644
--- src/http/v2/ngx_http_v2.h
+++ src/http/v2/ngx_http_v2.h
@@ -124,6 +124,8 @@ struct ngx_http_v2_connection_s {
ngx_uint_t processing;
ngx_uint_t frames;
ngx_uint_t idle;
+ ngx_uint_t new_streams;
+ ngx_uint_t refused_streams;
ngx_uint_t priority_limit;

ngx_uint_t pushing;