Mercurial > hg > nginx

changeset 8808:5b0c229ba5fe quic

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
QUIC: fixed padding calculation. Sometimes, QUIC packets need to be of certain (or minimal) size. This is achieved by adding PADDING frames. It is possible, that adding padding will affect header size, thus forcing us to recalculate padding size once more.
author Vladimir Homutov <vl@nginx.com>
date Mon, 05 Jul 2021 13:17:10 +0300
parents 0ac25efb2da3
children 6f434af59257
files src/event/quic/ngx_event_quic_output.c
diffstat 1 files changed, 3 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/src/event/quic/ngx_event_quic_output.c
+++ b/src/event/quic/ngx_event_quic_output.c
@@ -368,6 +368,9 @@ ngx_quic_output_packet(ngx_connection_t 
     }
 
     if (out.len < pad_len) {
+        /* compensate for potentially enlarged header in Length bytes */
+        pad_len -= ngx_quic_create_header(&pkt, NULL, pad_len, NULL)
+                   - ngx_quic_create_header(&pkt, NULL, out.len, NULL);
         ngx_memset(p, NGX_QUIC_FT_PADDING, pad_len - out.len);
         out.len = pad_len;
     }