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QUIC: expand UDP datagrams with an ack-eliciting Initial packet. 

Per draft-ietf-quic-transport-32 on the topic:

:   Similarly, a server MUST expand the payload of all UDP datagrams carrying
:   ack-eliciting Initial packets to at least the smallest allowed maximum
:   datagram size of 1200 bytes.
This commit is contained in:
Sergey Kandaurov 2020-10-21 12:46:23 +01:00
parent 8b3023ea6b
commit 4279c3cc87
1 changed files with 16 additions and 5 deletions
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21
src/event/ngx_event_quic.c
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@ -3848,6 +3848,7 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
ngx_queue_t *frames)
{
u_char *p;
size_t pad_len;
ssize_t len;
ngx_str_t out, res;
ngx_msec_t now;
@ -3902,11 +3903,6 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
out.len = p - out.data;
while (out.len < 4) {
*p++ = NGX_QUIC_FT_PADDING;
out.len++;
}
qc = c->quic;
keys = &c->quic->keys[start->level];
@ -3933,6 +3929,21 @@ ngx_quic_send_frames(ngx_connection_t *c, ngx_quic_send_ctx_t *ctx,
pkt.level = start->level;
pkt.dcid = qc->scid;
pkt.scid = qc->dcid;
if (start->level == ssl_encryption_initial && pkt.need_ack) {
pad_len = NGX_QUIC_MIN_INITIAL_SIZE - EVP_GCM_TLS_TAG_LEN
- ngx_quic_create_long_header(&pkt, NULL, out.len, NULL);
pad_len = ngx_min(pad_len, NGX_QUIC_MIN_INITIAL_SIZE);
} else {
pad_len = 4;
}
if (out.len < pad_len) {
ngx_memset(p, NGX_QUIC_FT_PADDING, pad_len - out.len);
out.len = pad_len;
}
pkt.payload = out;
res.data = dst;