quic conformance: 10.2.1 rate limiting

Implement the two requirements about limiting closing transmission size to
no more than thrice the received size.

Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21429)

1 files changed, 10 insertions, 1 deletions

diff --git a/include/internal/quic_txp.h b/include/internal/quic_txp.h
index 74590749fc..d5ca1c4361 100644
--- a/include/internal/quic_txp.h
+++ b/include/internal/quic_txp.h
@@ -56,7 +56,8 @@ typedef struct ossl_quic_tx_packetiser_args_st {
      *       crypto[QUIC_PN_SPACE_APP] is the 1-RTT crypto stream.
      */
     QUIC_SSTREAM    *crypto[QUIC_PN_SPACE_NUM];
-} OSSL_QUIC_TX_PACKETISER_ARGS;
+
+ } OSSL_QUIC_TX_PACKETISER_ARGS;
 
 typedef struct ossl_quic_tx_packetiser_st OSSL_QUIC_TX_PACKETISER;
 
@@ -68,6 +69,14 @@ typedef void (ossl_quic_initial_token_free_fn)(const unsigned char *buf,
 void ossl_quic_tx_packetiser_free(OSSL_QUIC_TX_PACKETISER *txp);
 
 /*
+ * When in the closing state we need to maintain a count of received bytes
+ * so that we can limit the number of close connection frames we send.
+ * Refer RFC 9000 s. 10.2.1 Closing Connection State.
+ */
+void ossl_quic_tx_packetiser_record_received_closing_bytes(
+        OSSL_QUIC_TX_PACKETISER *txp, size_t n);
+
+/*
  * Generates a datagram by polling the various ELs to determine if they want to
  * generate any frames, and generating a datagram which coalesces packets for
  * any ELs which do.