From abc0280543e2df7b8047a115fd2816bfa39dfe4c Mon Sep 17 00:00:00 2001
From: Martine Lenders <mail@martine-lenders.eu>
Date: Thu, 30 Apr 2015 21:27:17 +0200
Subject: [PATCH] ng_rpl: add source routing header parsing for ng_net

---
 sys/Makefile                                  |  3 +
 sys/include/net/ng_rpl.h                      | 33 +++++++++
 sys/include/net/ng_rpl/srh.h                  | 69 +++++++++++++++++++
 .../ng_ipv6/ext/rh/ng_ipv6_ext_rh.c           |  5 ++
 sys/net/routing/ng_rpl/srh/ng_rpl_srh.c       | 24 +++++++
 5 files changed, 134 insertions(+)
 create mode 100644 sys/include/net/ng_rpl.h
 create mode 100644 sys/include/net/ng_rpl/srh.h
 create mode 100644 sys/net/routing/ng_rpl/srh/ng_rpl_srh.c

diff --git a/sys/Makefile b/sys/Makefile
index 489cc115207b..8349157362f7 100644
--- a/sys/Makefile
+++ b/sys/Makefile
@@ -113,6 +113,9 @@ endif
 ifneq (,$(filter ng_pktbuf,$(USEMODULE)))
     DIRS += net/crosslayer/ng_pktbuf
 endif
+ifneq (,$(filter ng_rpl_srh,$(USEMODULE)))
+    DIRS += net/routing/ng_rpl/srh
+endif
 ifneq (,$(filter ng_sixlowpan,$(USEMODULE)))
     DIRS += net/network_layer/ng_sixlowpan
 endif
diff --git a/sys/include/net/ng_rpl.h b/sys/include/net/ng_rpl.h
new file mode 100644
index 000000000000..fc738e282314
--- /dev/null
+++ b/sys/include/net/ng_rpl.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ *
+ * 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_ng_rpl  New RPL
+ * @ingroup     net
+ * @{
+ *
+ * @file
+ * @brief   TODO
+ *
+ * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
+ */
+#ifndef NG_RPL_H_
+#define NG_RPL_H_
+
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NG_RPL_H_ */
+/** @} */
diff --git a/sys/include/net/ng_rpl/srh.h b/sys/include/net/ng_rpl/srh.h
new file mode 100644
index 000000000000..653ab7ea4d54
--- /dev/null
+++ b/sys/include/net/ng_rpl/srh.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ *
+ * 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_rpl_srh RPL source routing header extension
+ * @ingroup     net_rpl
+ * @brief       Implementation of RPL source routing extension headers
+ * @see <a href="https://tools.ietf.org/html/rfc6554">
+ *          RFC 6554
+ *      </a>
+ * @{
+ *
+ * @file
+ * @brief       Definititions for RPL source routing extension headers
+ *
+ * @author  Martine Lenders <mlenders@inf.fu-berlin.de>
+ */
+#ifndef NG_RPL_SRH_H_
+#define NG_RPL_SRH_H_
+
+#include "net/ng_ipv6/addr.h"
+#include "net/ng_ipv6/ext.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief   Type for source routing header.
+ */
+#define NG_RPL_SRH_TYPE     (3U)
+
+/**
+ * @brief   The RPL Source routing header.
+ *
+ * @see <a href="https://tools.ietf.org/html/rfc6554">
+ *          RFC 6554
+ *      </a>
+ *
+ * @extends ng_ipv6_ext_rh_t
+ */
+typedef struct __attribute__((packed)) {
+    uint8_t nh;         /**< next header */
+    uint8_t len;        /**< length in 8 octets without first octet */
+    uint8_t type;       /**< identifier of a particular routing header type */
+    uint8_t seg_left;   /**< number of route segments remaining */
+} ng_rpl_srh_t;
+
+/**
+ * @brief   Extract next hop from the RPL source routing header.
+ *
+ * @param[in] rh        A RPL source routing header.
+ *
+ * @return  next hop, on success
+ * @return  NULL, if not found.
+ */
+ng_ipv6_addr_t *ng_rpl_srh_next_hop(ng_rpl_srh_t *rh);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NG_RPL_SRH_H_ */
+/** @} */
diff --git a/sys/net/network_layer/ng_ipv6/ext/rh/ng_ipv6_ext_rh.c b/sys/net/network_layer/ng_ipv6/ext/rh/ng_ipv6_ext_rh.c
index ae09b16fe84b..5373651ac7f9 100644
--- a/sys/net/network_layer/ng_ipv6/ext/rh/ng_ipv6_ext_rh.c
+++ b/sys/net/network_layer/ng_ipv6/ext/rh/ng_ipv6_ext_rh.c
@@ -46,6 +46,11 @@ ng_ipv6_addr_t *ng_ipv6_ext_rh_next_hop(ng_ipv6_hdr_t *ipv6)
 
     if (ipv6->nh == NG_PROTNUM_IPV6_EXT_RH) {
         switch (ext->type) {
+#ifdef MODULE_NG_RPL_SRH
+            case NG_RPL_SRH_TYPE:
+                return ng_rpl_srh_next_hop((ng_rpl_srh_t *)ext);
+#endif
+
             default:
                 break;
         }
diff --git a/sys/net/routing/ng_rpl/srh/ng_rpl_srh.c b/sys/net/routing/ng_rpl/srh/ng_rpl_srh.c
new file mode 100644
index 000000000000..dad470e04677
--- /dev/null
+++ b/sys/net/routing/ng_rpl/srh/ng_rpl_srh.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
+ *
+ * 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.
+ */
+
+/**
+ * @{
+ *
+ * @file
+ */
+
+#include "net/ng_rpl/srh.h"
+
+ng_ipv6_addr_t *ng_rpl_srh_next_hop(ng_rpl_srh_t *rh)
+{
+    /* TODO */
+
+    return NULL;
+}
+
+/** @} */