diff --git a/sys/include/net/ipv6/ext/opt.h b/sys/include/net/ipv6/ext/opt.h
new file mode 100644
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+++ b/sys/include/net/ipv6/ext/opt.h
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2020 Freie Universität Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @defgroup    net_ipv6_ext_opt IPv6 destination and hop-by-hop options
+ * @ingroup     net_ipv6_ext
+ * @brief       Definitions for IPv6 destination and hop-by-hop options
+ *              extension headers
+ * @{
+ *
+ * @file
+ * @brief   Destination and hop-by-hop options extension header definitions.
+ *
+ * @author  Martine Lenders <m.lenders@fu-berlin.de>
+ */
+#ifndef NET_IPV6_EXT_OPT_H
+#define NET_IPV6_EXT_OPT_H
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @name Destination and hop-by-hop option types
+ * @see [IANA, IPv6 parameters]
+ *      (https://www.iana.org/assignments/ipv6-parameters/ipv6-parameters.xhtml#ipv6-parameters-2)
+ * @{
+ */
+#define IPV6_EXT_OPT_PAD1           (0x00U) /**< Pad1 */
+#define IPV6_EXT_OPT_PADN           (0x01U) /**< PadN */
+#define IPV6_EXT_OPT_JUMBO          (0xC2U) /**< Jumbo payload */
+#define IPV6_EXT_OPT_RPL            (0x63U) /**< RPL Option */
+#define IPV6_EXT_OPT_TEL            (0x04U) /**< Tunnel Encapsulation Limit */
+#define IPV6_EXT_OPT_RTR_ALERT      (0x05U) /**< Router Alert */
+#define IPV6_EXT_OPT_QUICK_START    (0x26U) /**< Quick-Start */
+#define IPV6_EXT_OPT_CALIPSO        (0x07U) /**< CALIPSO */
+#define IPV6_EXT_OPT_SMF_DPD        (0x08U) /**< SMF_DPD */
+#define IPV6_EXT_OPT_HOME_ADDR      (0xC9U) /**< Home Address */
+#define IPV6_EXT_OPT_ILNP_NONCE     (0x8BU) /**< ILNP Nonce */
+#define IPV6_EXT_OPT_LIO            (0x8CU) /**< Line-Identification Option */
+#define IPV6_EXT_OPT_MPL            (0x6DU) /**< MPL Option */
+#define IPV6_EXT_OPT_IP_DFF         (0xEEU) /**< IP_DFF */
+#define IPV6_EXT_OPT_PDM            (0x0FU) /**< Performance and Diagnostic Metrics */
+/** @} */
+
+/**
+ * @name Processing actions
+ * @see [RFC 8200, section 4.2](https://tools.ietf.org/html/rfc8200#section-4.2)
+ *
+ * > The Option Type identifiers are internally encoded such that their
+ * > highest-order 2 bits specify the action that must be taken if the
+ * > processing IPv6 node does not recognize the Option Type
+ * @{
+ */
+/**
+ * @brief   mask to decode action from type
+ */
+#define IPV6_EXT_OPT_ACTION_MASK            (0xc0)
+/**
+ * @brief   skip over this option and continue processing the header
+ */
+#define IPV6_EXT_OPT_ACTION_SKIP            (0x00)
+#define IPV6_EXT_OPT_ACTION_DISC            (0x40)  /**< discard the packet */
+/**
+ * @brief   discard the packet
+ *
+ * > and, regardless of whether or not the packet's Destination Address
+ * > was a multicast address, send an ICMP Parameter Problem, Code 2,
+ * > message to the packet's Source Address, pointing to the
+ * > unrecognized Option Type.
+ */
+#define IPV6_EXT_OPT_ACTION_DISC_ERR_MCAST  (0x80)
+
+/**
+ * @brief   discard the packet
+ *
+ * > and, only if the packet's Destination Address was not a multicast
+ * > address, send an ICMP Parameter Problem, Code 2, message to the
+ * > packet's Source Address, pointing to the unrecognized Option Type.
+ */
+#define IPV6_EXT_OPT_ACTION_DISC_ERR        (0xc0)
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NET_IPV6_EXT_OPT_H */
+/** @} */