Add structures for the buffered outgoing flight.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>

2 files changed, 28 insertions, 0 deletions

diff --git a/lib/gnutls_int.h b/lib/gnutls_int.h
index 7a54723224..eb84130334 100644
--- a/lib/gnutls_int.h
+++ b/lib/gnutls_int.h
@@ -526,6 +526,27 @@ typedef struct
   int free_rsa_params;
 } internal_params_st;
 
+struct dtls_hsk_retransmit_buffer;
+typedef struct dtls_hsk_retransmit_buffer dtls_hsk_retransmit_buffer;
+
+/* This is a linked list used to buffer the next flight of outgoing
+   handshake messages. Messages are queued whole; they are fragmented
+   dynamically on transmit. */
+struct dtls_hsk_retransmit_buffer
+{
+  dtls_hsk_retransmit_buffer *next;
+
+  /* The actual handshake message */
+  gnutls_datum_t msg;
+
+  /* Record layer epoch of message */
+  uint16_t epoch;
+
+  /* Handshake layer type and sequence of message */
+  gnutls_handshake_description_t type;
+  uint16_t sequence;
+};
+
 /* DTLS session state
  */
 typedef struct
@@ -540,6 +561,10 @@ typedef struct
   uint16_t hsk_write_seq;
   uint16_t hsk_read_seq;
   uint16_t hsk_mtu;
+
+  /* Head of the next outgoing flight. */
+  dtls_hsk_retransmit_buffer *retransmit;
+  dtls_hsk_retransmit_buffer **retransmit_end;
 } dtls_st;
 
 
diff --git a/lib/gnutls_state.c b/lib/gnutls_state.c
index 743975db26..afdbb02009 100644
--- a/lib/gnutls_state.c
+++ b/lib/gnutls_state.c
@@ -391,6 +391,9 @@ gnutls_init_dtls (gnutls_session_t * session,
   (*session)->internals.dtls.hsk_mtu = DTLS_DEFAULT_MTU;
   (*session)->internals.transport = GNUTLS_DGRAM;
 
+  /* Initialize pointer used to enqueue messages for retransmit. */
+  (*session)->internals.dtls.retransmit_end = &(*session)->internals.dtls.retransmit;
+
   return 0;
 }