marc
/
RIOT
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
Browse Source

ipv6_hdr: Initial import

dev/timer
Martine Lenders 8 years ago
parent
5d1ae12e8d
commit
9c30851b45
6 changed files with 421 additions and 0 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 5
      Makefile.dep
  2. 3
      sys/Makefile
  3. 1
      sys/include/net/ng_ipv6.h
  4. 324
      sys/include/net/ng_ipv6/hdr.h
  5. 3
      sys/net/network_layer/ng_ipv6/hdr/Makefile
  6. 85
      sys/net/network_layer/ng_ipv6/hdr/ng_ipv6_hdr.c

5
Makefile.dep
Unescape View File

@ -48,6 +48,11 @@ ifneq (,$(filter sixlowpan,$(USEMODULE)))
USEMODULE += vtimer
endif
ifneq (,$(filter ng_ipv6_hdr,$(USEMODULE)))
USEMODULE += ng_inet_csum
USEMODULE += ng_pktbuf
endif
ifneq (,$(filter ng_ipv6_nc,$(USEMODULE)))
USEMODULE += ng_ipv6_addr
endif

3
sys/Makefile
Unescape View File

@ -65,6 +65,9 @@ endif
ifneq (,$(filter ng_ipv6_addr,$(USEMODULE)))
DIRS += net/network_layer/ng_ipv6/addr
endif
ifneq (,$(filter ng_ipv6_hdr,$(USEMODULE)))
DIRS += net/network_layer/ng_ipv6/hdr
endif
ifneq (,$(filter ng_ipv6_nc,$(USEMODULE)))
DIRS += net/network_layer/ng_ipv6/nc
endif

1
sys/include/net/ng_ipv6.h
Unescape View File

@ -23,6 +23,7 @@
#define NG_IPV6_H_
#include "net/ng_ipv6/addr.h"
#include "net/ng_ipv6/hdr.h"
#include "net/ng_ipv6/netif.h"
#ifdef __cplusplus

324
sys/include/net/ng_ipv6/hdr.h
Unescape View File

@ -0,0 +1,324 @@
/*
* 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_ipv6_hdr IPv6 header defintions
* @ingroup net_ng_ipv6
* @{
*
* @file
* @brief IPv6 header
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef NG_IPV6_HDR_H_
#define NG_IPV6_HDR_H_
#include <inttypes.h>
#include <stdbool.h>
#include "byteorder.h"
#include "net/ng_ipv6/addr.h"
#include "net/ng_inet_csum.h"
#include "net/ng_pkt.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Data type to represent an IPv6 packet header
*
* @details The structure of the header is as follows:
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ {.unparsed}
* 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |Version| Traffic Class | Flow Label |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Payload Length | Next Header | Hop Limit |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | |
* + Source Address +
* | |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | |
* + +
* | |
* + Destination Address +
* | |
* + +
* | |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* @see <a href="http://tools.ietf.org/html/rfc2460#section-3">
* RFC 2460, section 3
* </a>
*/
typedef struct __attribute__((packed)) {
/**
* @brief Version, traffic class, and flow label
*
* @details The version are the 4 most significant bits, the traffic class
* the 8 next bit, and the remainding 20 bits are the flow label (see
* above).
*
* This module provides helper functions to set, get, and check these
* fields accordingly:
* * ng_ipv6_hdr_set_version()
* * ng_ipv6_hdr_get_version()
* * ng_ipv6_hdr_is_ipv6_hdr()
* * ng_ipv6_hdr_set_tc()
* * ng_ipv6_hdr_set_tc_ecn()
* * ng_ipv6_hdr_set_tc_dscp()
* * ng_ipv6_hdr_get_tc()
* * ng_ipv6_hdr_get_tc_ecn()
* * ng_ipv6_hdr_get_tc_dscp()
* * ng_ipv6_hdr_set_fl()
* * ng_ipv6_hdr_get_fl()
*/
network_uint32_t v_tc_fl;
network_uint16_t len; /**< payload length of this packet. */
uint8_t nh; /**< type of next header in this packet. */
uint8_t hl; /**< hop limit for this packet. */
ng_ipv6_addr_t src; /**< source address of this packet. */
ng_ipv6_addr_t dst; /**< destination address of this packet. */
} ng_ipv6_hdr_t;
/**
* @brief Sets the version field of @p hdr to 6
*
* @param[out] hdr Pointer to an IPv6 header.
*/
static inline void ng_ipv6_hdr_set_version(ng_ipv6_hdr_t *hdr)
{
hdr->v_tc_fl.u8[0] &= 0x0f;
hdr->v_tc_fl.u8[0] |= 0x60;
}
/**
* @brief Gets the value of the version field of @p hdr
*
* @param[in] hdr Pointer to an IPv6 header.
*
* @return Value of the version field of @p hdr.
*/
static inline uint8_t ng_ipv6_hdr_get_version(const ng_ipv6_hdr_t *hdr)
{
return ((hdr->v_tc_fl.u8[0]) >> 4);
}
/**
* @brief Checks if the version field is set to 6
*
* @param[in] hdr Pointer to an IPv6 header.
*
* @return true, if version field is 6
* @return false, otherwise
*/
static inline bool ng_ipv6_hdr_is_ipv6_hdr(const ng_ipv6_hdr_t *hdr)
{
return (((hdr->v_tc_fl.u8[0]) & 0xf0) == 0x60);
}
/**
* @brief Sets the traffic class field of @p hdr
*
* @param[out] hdr Pointer to an IPv6 header.
* @param[in] tc The new value for the traffic class field.
*/
static inline void ng_ipv6_hdr_set_tc(ng_ipv6_hdr_t *hdr, uint8_t tc)
{
hdr->v_tc_fl.u8[0] &= 0xf0;
hdr->v_tc_fl.u8[0] |= (0x0f & (tc >> 4));
hdr->v_tc_fl.u8[1] &= 0x0f;
hdr->v_tc_fl.u8[1] |= (0xf0 & (tc << 4));
}
/**
* @brief Sets the value of the Explicit Congestion Notification (ECN) part
* of the traffic class field of @p hdr
*
* @details The field is needed e.g. in context of 6LoWPAN header compression
*
* @see <a href="https://tools.ietf.org/html/rfc3168#section-5">
* RFC 3168, section 5
* </a>
*
* @param[out] hdr Pointer to an IPv6 header.
* @param[in] ecn The new value for the 2-bit ECN part of the traffic class
* field.
*/
static inline void ng_ipv6_hdr_set_tc_ecn(ng_ipv6_hdr_t *hdr, uint8_t ecn)
{
hdr->v_tc_fl.u8[0] &= 0xf3;
hdr->v_tc_fl.u8[0] |= (0x0c & (ecn << 2));
}
/**
* @brief Sets the value of the Differentiated Service Codepoint (DSCP) part
* of the traffic class field of @p hdr
*
* @details The field is needed e.g. in context of 6LoWPAN header compression
*
* @see <a href="https://tools.ietf.org/html/rfc2474#section-3">
* RFC 2474, section 3
* </a>
*
* @param[out] hdr Pointer to an IPv6 header.
* @param[in] dscp The new value for the 6-bit DSCP ng_part of the traffic class
* field.
*/
static inline void ng_ipv6_hdr_set_tc_dscp(ng_ipv6_hdr_t *hdr, uint8_t dscp)
{
hdr->v_tc_fl.u8[0] &= 0xfc;
hdr->v_tc_fl.u8[0] |= (0x03 & (dscp >> 4));
hdr->v_tc_fl.u8[1] &= 0x0f;
hdr->v_tc_fl.u8[1] |= (0xf0 & (dscp << 4));
}
/**
* @brief Gets the value of the traffic class field of @p hdr
*
* @param[in] hdr Pointer to an IPv6 header.
*
* @return Value of the traffic class field of @p hdr.
*/
static inline uint8_t ng_ipv6_hdr_get_tc(const ng_ipv6_hdr_t *hdr)
{
return ((((hdr->v_tc_fl.u8[0]) & 0x0f) << 4) |
((hdr->v_tc_fl.u8[1] & 0xf0) >> 4));
}
/**
* @brief Gets the value of the Explicit Congestion Notification (ECN) part
* of the traffic class field of @p hdr
*
* @details The field is needed e.g. in context of 6LoWPAN header compression
*
* @see <a href="https://tools.ietf.org/html/rfc3168#section-5">
* RFC 3168, section 5
* </a>
*
* @param[in] hdr Pointer to an IPv6 header.
*
* @return Value of the ECN part of the traffic class field of @p hdr.
*/
static inline uint8_t ng_ipv6_hdr_get_tc_ecn(const ng_ipv6_hdr_t *hdr)
{
return (((hdr->v_tc_fl.u8[0]) & 0x0c) >> 2);
}
/**
* @brief Gets the value of the Differentiated Service Codepoint (DSCP) part
* of the traffic class field of @p hdr
*
* @details The field is needed e.g. in context of 6LoWPAN header compression
*
* @see <a href="https://tools.ietf.org/html/rfc2474#section-3">
* RFC 2474, section 3
* </a>
*
* @param[in] hdr Pointer to an IPv6 header.
*
* @return Value of the DSCP part of the traffic class field of @p hdr.
*/
static inline uint8_t ng_ipv6_hdr_get_tc_dscp(const ng_ipv6_hdr_t *hdr)
{
return ((((hdr->v_tc_fl.u8[0]) & 0x03) << 4) |
((hdr->v_tc_fl.u8[1] & 0xf0) >> 4));
}
/**
* @brief Sets the flow label field of @p hdr
*
* @param[out] hdr Pointer to an IPv6 header.
* @param[in] fl The new value for the flow label field in host byte order.
*/
static inline void ng_ipv6_hdr_set_fl(ng_ipv6_hdr_t *hdr, uint32_t fl)
{
hdr->v_tc_fl.u8[1] &= 0xf0;
hdr->v_tc_fl.u8[1] |= (0x0f & (byteorder_htonl(fl).u8[1]));
hdr->v_tc_fl.u16[1] = byteorder_htonl(fl).u16[1];
}
/**
* @brief Gets the value of the flow label field of @p hdr
*
* @param[in] hdr Pointer to an IPv6 header.
*
* @return Value of the flow label field of @p hdr.
*/
static inline uint32_t ng_ipv6_hdr_get_fl(const ng_ipv6_hdr_t *hdr)
{
return byteorder_ntohl(hdr->v_tc_fl) & 0x000fffff;
}
/**
* @brief Calculates the Internet Checksum for the IPv6 Pseudo Header.
*
* @see <a href="https://tools.ietf.org/html/rfc2460#section-8.1">
* RFC 2460, section 8.1
* </a>
*
* @param[in] sum Preinialized value of the sum.
* @param[in] prot_num The @ref net_ng_protnum you want to calculate the
* checksum for. Can not be inferred from
* ng_ipv6_hdr_t::nh, since it can be an IPv6 exentension
* header.
* @param[in] hdr An IPv6 header to derive the Pseudo Header from.
* @param[in] len The upper-layer packet length for the pseudo header.
* Can not be inferred from ng_ipv6_hdr_t::len, since
* there can be extension headers between the IPv6 header
* and the payload.
*
* @return The non-normalized Internet Checksum of the given IPv6 pseudo header.
*/
static inline uint16_t ng_ipv6_hdr_inet_csum(uint16_t sum, ng_ipv6_hdr_t *hdr,
uint8_t prot_num, uint16_t len)
{
return ng_inet_csum(sum + len + prot_num, hdr->src.u8,
(2 * sizeof(ng_ipv6_addr_t)));
}
/**
* @brief Builds an IPv6 header for sending and adds it to the packet buffer.
*
* @details Initializes version field with 6, traffic class, flow label, and
* hop limit with 0, and next header with @ref NG_PROTNUM_RESERVED.
*
* @param[in] payload Payload for the packet.
* @param[in] src Source address for the header. Can be NULL if not
* known or required.
* @param[in] src_len Length of @p src. Can be 0 if not known or required or
* must be `sizeof(ng_ipv6_addr_t)`.
* @param[in] dst Destination address for the header. Can be NULL if not
* known or required.
* @param[in] dst_len Length of @p dst. Can be 0 if not known or required or
* must be `sizeof(ng_ipv6_addr_t)`.
*
* @return The an IPv6 header in packet buffer on success.
* @return NULL on error.
*/
ng_pktsnip_t *ng_ipv6_hdr_build(ng_pktsnip_t *payload,
uint8_t *src, uint8_t src_len,
uint8_t *dst, uint8_t dst_len);
#ifdef __cplusplus
}
#endif
#endif /* NG_IPV6_HDR_H_ */
/** @} */

3
sys/net/network_layer/ng_ipv6/hdr/Makefile
Unescape View File

@ -0,0 +1,3 @@
MODULE = ng_ipv6_hdr
include $(RIOTBASE)/Makefile.base

85
sys/net/network_layer/ng_ipv6/hdr/ng_ipv6_hdr.c
Unescape View File

@ -0,0 +1,85 @@
/*
* 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_ipv6/addr.h"
#include "net/ng_ipv6/hdr.h"
#include "net/ng_nettype.h"
#include "net/ng_pktbuf.h"
#include "net/ng_protnum.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
#if ENABLE_DEBUG && defined(MODULE_NG_IPV6_ADDR)
static char addr_str[NG_IPV6_ADDR_MAX_STR_LEN];
#endif
/* For independent testing */
#ifdef MODULE_NG_IPV6
#define HDR_NETTYPE (NG_NETTYPE_IPV6)
#else
#define HDR_NETTYPE (NG_NETTYPE_UNDEF)
#endif
ng_pktsnip_t *ng_ipv6_hdr_build(ng_pktsnip_t *payload,
uint8_t *src, uint8_t src_len,
uint8_t *dst, uint8_t dst_len)
{
ng_pktsnip_t *ipv6;
ng_ipv6_hdr_t *hdr;
if (((src_len != 0) && (src_len != sizeof(ng_ipv6_addr_t))) ||
((dst_len != 0) && (dst_len != sizeof(ng_ipv6_addr_t)))) {
DEBUG("ipv6_hdr: Address length was not 0 or %zu byte.\n",
sizeof(ng_ipv6_addr_t));
return NULL;
}
ipv6 = ng_pktbuf_add(payload, NULL, sizeof(ng_ipv6_hdr_t), HDR_NETTYPE);
if (ipv6 == NULL) {
DEBUG("ipv6_hdr: no space left in packet buffer\n");
return NULL;
}
hdr = (ng_ipv6_hdr_t *)ipv6->data;
if ((src != NULL) && (src_len != 0)) {
#ifdef MODULE_NG_IPV6_ADDR
DEBUG("ipv6_hdr: set packet source to %s\n",
ng_ipv6_addr_to_str(addr_str, (ng_ipv6_addr_t *)src,
sizeof(addr_str)));
#endif
memcpy(&hdr->src, src, src_len);
}
memset(&hdr->dst + dst_len, 0, sizeof(ng_ipv6_addr_t) - dst_len);
if ((dst != NULL) && (dst_len != 0)) {
#ifdef MODULE_NG_IPV6_ADDR
DEBUG("ipv6_hdr: set packet destination to %s\n",
ng_ipv6_addr_to_str(addr_str, (ng_ipv6_addr_t *)dst,
sizeof(addr_str)));
#endif
memcpy(&hdr->dst, dst, dst_len);
}
hdr->v_tc_fl = byteorder_htonl(0x60000000); /* set version, tc and fl in one go*/
hdr->nh = NG_PROTNUM_RESERVED;
hdr->hl = 0;
return ipv6;
}
/** @} */
Write Preview
Loading…
Cancel
Save