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ng_ipv6_ext: initial import of extension header handling

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Martine Lenders 2015-03-07 21:46:57 +01:00 committed by Martine Lenders
parent 684a7d5b42
commit dcfa2681d6
8 changed files with 250 additions and 4 deletions
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12
Makefile.dep
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@ -112,6 +112,18 @@ ifneq (,$(filter ng_ipv6_hdr,$(USEMODULE)))
USEMODULE += ng_pktbuf
endif
ifneq (,$(filter ng_rpl_srh,$(USEMODULE)))
USEMODULE += ng_ipv6_ext_rh
endif
ifneq (,$(filter ng_ipv6_ext_rh,$(USEMODULE)))
USEMODULE += ng_ipv6_ext
endif
ifneq (,$(filter ng_ipv6_ext,$(USEMODULE)))
USEMODULE += ng_ipv6
endif
ifneq (,$(filter ng_ipv6_router,$(USEMODULE)))
USEMODULE += ng_ipv6
endif

3
sys/Makefile
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@ -74,6 +74,9 @@ endif
ifneq (,$(filter ng_ipv6_addr,$(USEMODULE)))
DIRS += net/network_layer/ng_ipv6/addr
endif
ifneq (,$(filter ng_ipv6_ext,$(USEMODULE)))
DIRS += net/network_layer/ng_ipv6/ext
endif
ifneq (,$(filter ng_ipv6_hdr,$(USEMODULE)))
DIRS += net/network_layer/ng_ipv6/hdr
endif

1
sys/include/net/ng_ipv6.h
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@ -33,6 +33,7 @@
#include "thread.h"
#include "net/ng_ipv6/addr.h"
#include "net/ng_ipv6/ext.h"
#include "net/ng_ipv6/hdr.h"
#include "net/ng_ipv6/nc.h"
#include "net/ng_ipv6/netif.h"

105
sys/include/net/ng_ipv6/ext.h Normal file
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@ -0,0 +1,105 @@
/*
* 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_ext IPv6 extension headers.
* @ingroup net_ng_ipv6
* @brief Implementation of IPv6 extension headers
* @see <a href="https://tools.ietf.org/html/rfc2460#section-4">
* RFC 2460, section 4
* </a>
* @{
*
* @file
* @brief Definititions for IPv6 extension headers
*
* @author Martine Lenders <mlenders@inf.fu-berlin.de>
*/
#ifndef NG_IPV6_EXT_H_
#define NG_IPV6_EXT_H_
#include <inttypes.h>
#include <stdbool.h>
#include "byteorder.h"
#include "kernel_types.h"
#include "net/ng_pkt.h"
#ifdef __cplusplus
extern "C" {
#endif
#define NG_IPV6_EXT_LEN_UNIT (8U) /**< Unit in byte for the extension header's
* length field */
/**
* @brief IPv6 extension headers.
*
* @see <a href="https://tools.ietf.org/html/rfc2460#section-4">
* RFC 2460, section 4.1
* </a>
*/
typedef struct __attribute__((packed)) {
uint8_t nh; /**< next header */
uint8_t len; /**< length in 8 octets without first octet */
} ng_ipv6_ext_t;
/**
* @brief Demultiplex extension headers according to @p nh.
*
* @internal
*
* @param[in] iface The receiving interface.
* @param[in] pkt A packet.
* @param[in] nh A protocol number (see @ref net_ng_protnum).
*
* @return true, on success.
* @return false, on failure.
*/
bool ng_ipv6_ext_demux(kernel_pid_t iface, ng_pktsnip_t *pkt,
uint8_t nh);
/**
* @brief Gets the next extension header in a packet.
*
* @param[in] ext The current extension header.
*
* @return The next extension header.
*/
static inline ng_ipv6_ext_t *ng_ipv6_ext_get_next(ng_ipv6_ext_t *ext)
{
return (ng_ipv6_ext_t *)((uint8_t *)(ext) +
(ext->len * NG_IPV6_EXT_LEN_UNIT) +
NG_IPV6_EXT_LEN_UNIT);
}
/**
* @brief Builds an extension header for sending.
*
* @param[in] ipv6 The IPv6 header. Can be NULL.
* @param[in] next The next header. Must be a successor to @p ipv6 if it is
* not NULL.
* @param[in] nh @ref net_ng_protnum of the next header.
* @param[in] size Size of the extension header.
*
* @return The extension header on success.
* @return NULL, on error.
*/
ng_pktsnip_t *ng_ipv6_ext_build(ng_pktsnip_t *ipv6, ng_pktsnip_t *next,
uint8_t nh, size_t size);
#ifdef __cplusplus
}
#endif
#endif /* NG_IPV6_EXT_H_ */
/**
* @}
*/

6
sys/include/net/ng_protnum.h
View File

@ -75,7 +75,7 @@ extern "C" {
#define NG_PROTNUM_IL (40) /**< IL Transport Protocol */
#define NG_PROTNUM_IPV6 (41) /**< IPv6 encapsulation */
#define NG_PROTNUM_SDRP (42) /**< Source Demand Routing Protocol */
#define NG_PROTNUM_IPV6_EXT_ROUTE (43) /**< Routing Header for IPv6 */
#define NG_PROTNUM_IPV6_EXT_RH (43) /**< Routing Header for IPv6 */
#define NG_PROTNUM_IPV6_EXT_FRAG (44) /**< Fragment Header for IPv6 */
#define NG_PROTNUM_IDRP (45) /**< Inter-Domain Routing Protocol */
#define NG_PROTNUM_RSVP (46) /**< Reservation Protocol */
@ -95,7 +95,7 @@ extern "C" {
#define NG_PROTNUM_SKIP (57) /**< SKIP */
#define NG_PROTNUM_ICMPV6 (58) /**< ICMP for IPv6 */
#define NG_PROTNUM_IPV6_NONXT (59) /**< No Next Header for IPv6 */
#define NG_PROTNUM_IPV6_EXT_DEST_OPTS (60) /**< IPv6 Extension Header:
#define NG_PROTNUM_IPV6_EXT_DST (60) /**< IPv6 Extension Header:
* Destination Options */
#define NG_PROTNUM_CFTP (62) /**< CFTP */
#define NG_PROTNUM_SAT_EXPAK (64) /**< SATNET and Backroom EXPAK */
@ -168,7 +168,7 @@ extern "C" {
#define NG_PROTNUM_SCTP (132) /**< Stream Control Transmission Protocol */
#define NG_PROTNUM_FC (133) /**< Fibre Channel */
#define NG_PROTNUM_RSVP_E2E_IGNORE (134) /**< RSVP-E2E-IGNORE */
#define NG_PROTNUM_IPV6_EXT_MOB_HDR (135) /**< IPv6 Mobility Extension Header */
#define NG_PROTNUM_IPV6_EXT_MOB (135) /**< IPv6 Mobility Extension Header */
#define NG_PROTNUM_UDPLITE (136) /**< UDPLite */
#define NG_PROTNUM_MPLS_IN_IP (137) /**< MPLS-in-IP */
#define NG_PROTNUM_MANET (138) /**< MANET Protocols */

3
sys/net/network_layer/ng_ipv6/ext/Makefile Normal file
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@ -0,0 +1,3 @@
MODULE = ng_ipv6_ext
include $(RIOTBASE)/Makefile.base

111
sys/net/network_layer/ng_ipv6/ext/ng_ipv6_ext.c Normal file
View File

@ -0,0 +1,111 @@
/*
* 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 <errno.h>
#include "utlist.h"
#include "net/ng_pktbuf.h"
#include "net/ng_ipv6.h"
#include "net/ng_ipv6/ext.h"
bool ng_ipv6_ext_demux(kernel_pid_t iface, ng_pktsnip_t *pkt,
uint8_t nh)
{
ng_pktsnip_t *ext_snip;
ng_ipv6_ext_t *ext;
unsigned int offset = 0;
ext = ((ng_ipv6_ext_t *)(((uint8_t *)pkt->data) + sizeof(ng_ipv6_hdr_t)));
bool c = true;
while (c) {
switch (nh) {
case NG_PROTNUM_IPV6_EXT_HOPOPT:
case NG_PROTNUM_IPV6_EXT_DST:
case NG_PROTNUM_IPV6_EXT_RH:
case NG_PROTNUM_IPV6_EXT_FRAG:
case NG_PROTNUM_IPV6_EXT_AH:
case NG_PROTNUM_IPV6_EXT_ESP:
case NG_PROTNUM_IPV6_EXT_MOB:
/* TODO: add handling of types */
nh = ext->nh;
offset += ((ext->len * NG_IPV6_EXT_LEN_UNIT) + NG_IPV6_EXT_LEN_UNIT);
ext = ng_ipv6_ext_get_next((ng_ipv6_ext_t *)ext);
break;
default:
c = false;
offset += ((ext->len * NG_IPV6_EXT_LEN_UNIT) + NG_IPV6_EXT_LEN_UNIT);
ext = ng_ipv6_ext_get_next((ng_ipv6_ext_t *)ext);
break;
}
}
ext_snip = ng_pktbuf_add(pkt, pkt->data, offset, NG_NETTYPE_IPV6);
if (ext_snip == NULL) {
return false;
}
ng_ipv6_demux(iface, pkt, nh); /* demultiplex next header */
return true;
}
ng_pktsnip_t *ng_ipv6_ext_build(ng_pktsnip_t *ipv6, ng_pktsnip_t *next,
uint8_t nh, size_t size)
{
ng_pktsnip_t *prev = NULL, *snip;
ng_ipv6_ext_t *ext;
if (ipv6 != NULL) {
LL_SEARCH_SCALAR(ipv6, prev, next, next);
if (prev == NULL) {
return NULL;
}
}
if (size < NG_IPV6_EXT_LEN_UNIT) {
return NULL;
}
snip = ng_pktbuf_add(next, NULL, size, NG_NETTYPE_IPV6);
if (snip == NULL) {
return NULL;
}
ext = snip->data;
ext->nh = nh;
if (size & 0x7) { /* not divisible by eight */
ext->len = (size / NG_IPV6_EXT_LEN_UNIT);
}
else {
ext->len = (size / NG_IPV6_EXT_LEN_UNIT) - 1;
}
if (prev != NULL) {
prev->next = snip;
}
return snip;
}
/** @} */

13
sys/net/network_layer/ng_ipv6/ng_ipv6.c
View File

@ -78,7 +78,18 @@ void ng_ipv6_demux(kernel_pid_t iface, ng_pktsnip_t *pkt, uint8_t nh)
case NG_PROTNUM_ICMPV6:
ng_icmpv6_demux(iface, pkt);
break;
/* TODO: add extension header handling */
case NG_PROTNUM_IPV6_EXT_HOPOPT:
case NG_PROTNUM_IPV6_EXT_DST:
case NG_PROTNUM_IPV6_EXT_RH:
case NG_PROTNUM_IPV6_EXT_FRAG:
case NG_PROTNUM_IPV6_EXT_AH:
case NG_PROTNUM_IPV6_EXT_ESP:
case NG_PROTNUM_IPV6_EXT_MOB:
if (!ng_ipv6_ext_demux(iface, pkt, nh)) {
DEBUG("ipv6: unable to parse extension headers.\n");
ng_pktbuf_release(pkt);
return;
}
case NG_PROTNUM_IPV6:
_decapsulate(pkt);
break;