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QUIC: fixed padding calculation.

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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.
This commit is contained in:
Vladimir Homutov 2021-07-05 13:17:10 +03:00
parent a85084fea1
commit 1860eda336
1 changed files with 3 additions and 0 deletions
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src/event/quic/ngx_event_quic_output.c
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@ -368,6 +368,9 @@ ngx_quic_output_packet(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
} }
if (out.len < pad_len) { 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); ngx_memset(p, NGX_QUIC_FT_PADDING, pad_len - out.len);
out.len = pad_len; out.len = pad_len;
} }