From bb98101bd4acd48f1d0654a7c15840cde0a01d78 Mon Sep 17 00:00:00 2001
From: Tim Kourt <tim.a.kourt@linux.intel.com>
Date: Thu, 29 Nov 2018 14:41:39 -0800
Subject: [PATCH] eap-tls-common: Handle response retransmission

---
 src/eap-tls-common.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
 src/eap-tls-common.h |  2 ++
 2 files changed, 47 insertions(+)

diff --git a/src/eap-tls-common.c b/src/eap-tls-common.c
index a2c66270..680f69b7 100644
--- a/src/eap-tls-common.c
+++ b/src/eap-tls-common.c
@@ -608,6 +608,51 @@ error:
 	eap_method_error(eap);
 }
 
+void eap_tls_common_handle_retransmit(struct eap_state *eap,
+						const uint8_t *pkt, size_t len)
+{
+	struct eap_tls_state *eap_tls = eap_get_data(eap);
+	uint8_t flags_version;
+
+	if (len < 1) {
+		l_error("%s: Request packet is too short.",
+						eap_get_method_name(eap));
+		goto error;
+	}
+
+	flags_version = pkt[0];
+
+	if (!eap_tls_validate_version(eap, flags_version)) {
+		l_error("%s: Version negotiation has failed.",
+						eap_get_method_name(eap));
+		goto error;
+	}
+
+	if (flags_version & EAP_TLS_FLAG_M) {
+		if (!eap_tls->rx_pdu_buf)
+			goto error;
+
+		eap_tls_send_fragmented_request_ack(eap);
+
+		return;
+	}
+
+	if (!eap_tls->tx_pdu_buf || !eap_tls->tx_pdu_buf->data ||
+						!eap_tls->tx_pdu_buf->len)
+		goto error;
+
+	if (EAP_TLS_HEADER_LEN + eap_tls->tx_pdu_buf->len > eap_get_mtu(eap))
+		eap_tls_send_fragment(eap);
+	else
+		eap_tls_send_response(eap, eap_tls->tx_pdu_buf->data,
+						eap_tls->tx_pdu_buf->len);
+
+	return;
+
+error:
+	eap_method_error(eap);
+}
+
 int eap_tls_common_settings_check(struct l_settings *settings,
 					struct l_queue *secrets,
 					const char *prefix,
diff --git a/src/eap-tls-common.h b/src/eap-tls-common.h
index 57320491..fe2d897c 100644
--- a/src/eap-tls-common.h
+++ b/src/eap-tls-common.h
@@ -56,6 +56,8 @@ void eap_tls_common_set_phase2_faild(struct eap_state *eap);
 
 void eap_tls_common_handle_request(struct eap_state *eap,
 					const uint8_t *pkt, size_t len);
+void eap_tls_common_handle_retransmit(struct eap_state *eap,
+						const uint8_t *pkt, size_t len);
 
 int eap_tls_common_settings_check(struct l_settings *settings,
 						struct l_queue *secrets,