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ng_sixlowpan: initial import of a context buffer
This commit is contained in:
Martine Lenders
parent
43d5fe1e8e
commit
39ed4baa92
@ -48,6 +48,11 @@ ifneq (,$(filter sixlowpan,$(USEMODULE)))
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USEMODULE += vtimer
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endif
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ifneq (,$(filter ng_sixlowpan_ctx,$(USEMODULE)))
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USEMODULE += ng_ipv6_addr
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USEMODULE += vtimer
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endif
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ifneq (,$(filter ng_ipv6_hdr,$(USEMODULE)))
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USEMODULE += ng_inet_csum
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USEMODULE += ng_pktbuf
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@ -92,6 +92,9 @@ endif
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ifneq (,$(filter ng_pktbuf,$(USEMODULE)))
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DIRS += net/crosslayer/ng_pktbuf
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endif
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ifneq (,$(filter ng_sixlowpan_ctx,$(USEMODULE)))
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DIRS += net/network_layer/ng_sixlowpan/ctx
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endif
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ifneq (,$(filter netapi,$(USEMODULE)))
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DIRS += net/crosslayer/netapi
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endif
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103
sys/include/net/ng_sixlowpan/ctx.h
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103
sys/include/net/ng_sixlowpan/ctx.h
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@ -0,0 +1,103 @@
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/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @defgroup net_ng_sixlowpan_ctx Contexts for 6LoWPAN address compression
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* @ingroup net_ng_sixlowpan
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* @brief Context buffer for stateful 6LoWPAN address compression
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* @see <a href="https://tools.ietf.org/html/rfc6282#section-3.1.2">
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* RFC 6282, section 3.1.2
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* </a>
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* @see <a href="http://tools.ietf.org/html/rfc6775#section-4.2">
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* RFC 6775, section 4.2
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* </a>
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* @{
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*
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* @file
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* @brief Context buffer definitions
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*
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* @author Martine Lenders <mlenders@inf.fu-berlin.de>
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*/
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#ifndef NG_SIXLOWPAN_CTX_H_
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#define NG_SIXLOWPAN_CTX_H_
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#include <inttypes.h>
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#include "net/ng_ipv6/addr.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define NG_SIXLOWPAN_CTX_SIZE (16) /**< maximum number of entries in
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* context buffer */
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typedef struct {
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ng_ipv6_addr_t prefix; /**< The prefix associated to this context. */
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uint8_t prefix_len; /**< Length of ng_sixlowpan_ctx_t::prefix in bit. */
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/**
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* @brief 4-bit Context ID.
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*
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* @note This needs to be here to easily translate prefixes to
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* ID.
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*/
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uint8_t id;
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/**
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* @brief Lifetime in minutes this context is valid.
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*
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* @see <a href="http://tools.ietf.org/html/rfc6775#section-4.2">
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* 6LoWPAN Context Option
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* </a>
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*/
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uint16_t ltime;
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} ng_sixlowpan_ctx_t;
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/**
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* @brief Gets a context matching the given IPv6 address best with its prefix.
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*
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* @param[in] addr An IPv6 address.
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*
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* @return The context associated with the best prefix for @p addr.
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* @return NULL if there is no such context.
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*/
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ng_sixlowpan_ctx_t *ng_sixlowpan_ctx_lookup_addr(const ng_ipv6_addr_t *addr);
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/**
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* @brief Gets context by ID.
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*
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* @param[in] id A context ID.
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*
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* @return The context associated with @p id.
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* @return NULL if there is no such context.
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*/
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ng_sixlowpan_ctx_t *ng_sixlowpan_ctx_lookup_id(uint8_t id);
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/**
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* @brief Updates (or adds if currently not registered) a context
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*
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* @param[in] id The ID for the context.
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* Must be < @ref NG_SIXLOWPAN_CTX_SIZE.
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* @param[in] prefix The prefix for the context.
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* @param[in] prefix_len Length of @p prefix in bits. Must be > 0, when
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* @p ltime > 0.
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* @param[in] ltime New lifetime of the context. The context will
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* be removed if 0.
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*
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* @return The new context on success.
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* @return NULL, on error or on removal.
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*/
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ng_sixlowpan_ctx_t *ng_sixlowpan_ctx_update(uint8_t id, const ng_ipv6_addr_t *prefix,
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uint8_t prefix_len, uint16_t ltime);
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#ifdef __cplusplus
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}
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#endif
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#endif /* NG_SIXLOWPAN_CTX_H_ */
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/** @} */
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3
sys/net/network_layer/ng_sixlowpan/ctx/Makefile
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3
sys/net/network_layer/ng_sixlowpan/ctx/Makefile
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@ -0,0 +1,3 @@
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MODULE = ng_sixlowpan_ctx
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include $(RIOTBASE)/Makefile.base
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172
sys/net/network_layer/ng_sixlowpan/ctx/ng_sixlowpan_ctx.c
Normal file
172
sys/net/network_layer/ng_sixlowpan/ctx/ng_sixlowpan_ctx.c
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@ -0,0 +1,172 @@
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/*
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* Copyright (C) 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @{
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*
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* @file
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*/
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#include <stdbool.h>
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#include <inttypes.h>
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#include "mutex.h"
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#include "net/ng_sixlowpan/ctx.h"
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#include "vtimer.h"
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#define ENABLE_DEBUG (0)
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#include "debug.h"
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static ng_sixlowpan_ctx_t _ctxs[NG_SIXLOWPAN_CTX_SIZE];
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static uint32_t _ctx_inval_times[NG_SIXLOWPAN_CTX_SIZE];
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static mutex_t _ctx_mutex = MUTEX_INIT;
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static uint32_t _current_minute(void);
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static void _update_lifetime(unsigned int id);
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#if ENABLE_DEBUG
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static char ipv6str[NG_IPV6_ADDR_MAX_STR_LEN];
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#endif
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static inline bool _still_valid(unsigned int id)
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{
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_update_lifetime(id);
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return (_ctxs[id].ltime > 0);
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}
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ng_sixlowpan_ctx_t *ng_sixlowpan_ctx_lookup_addr(const ng_ipv6_addr_t *addr)
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{
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uint8_t best = 0;
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ng_sixlowpan_ctx_t *res = NULL;
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mutex_lock(&_ctx_mutex);
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for (unsigned int id = 0; id < NG_SIXLOWPAN_CTX_SIZE; id++) {
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if (_still_valid(id)) {
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uint8_t match = ng_ipv6_addr_match_prefix(&_ctxs[id].prefix, addr);
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if ((_ctxs[id].prefix_len <= match) && (match > best)) {
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best = match;
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res = _ctxs + id;
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}
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}
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}
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mutex_unlock(&_ctx_mutex);
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#if ENABLE_DEBUG
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if (res != NULL) {
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DEBUG("6lo ctx: found context (%u, %s/%" PRIu8 ") ", res->id,
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ng_ipv6_addr_to_str(ipv6str, &res->prefix, sizeof(ipv6str)),
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res->prefix_len);
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DEBUG("for address %s\n", ng_ipv6_addr_to_str(ipv6str, addr, sizeof(ipv6str)));
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}
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#endif
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return res;
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}
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ng_sixlowpan_ctx_t *ng_sixlowpan_ctx_lookup_id(uint8_t id)
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{
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if (id >= NG_SIXLOWPAN_CTX_SIZE) {
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return NULL;
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}
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mutex_lock(&_ctx_mutex);
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if (_still_valid((unsigned int)id)) {
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DEBUG("6lo ctx: found context (%u, %s/%" PRIu8 ")\n", id,
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ng_ipv6_addr_to_str(ipv6str, &_ctxs[id].prefix, sizeof(ipv6str)),
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_ctxs[id].prefix_len);
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mutex_unlock(&_ctx_mutex);
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return _ctxs + id;
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}
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mutex_unlock(&_ctx_mutex);
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return NULL;
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}
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ng_sixlowpan_ctx_t *ng_sixlowpan_ctx_update(uint8_t id, const ng_ipv6_addr_t *prefix,
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uint8_t prefix_len, uint16_t ltime)
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{
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if ((id >= NG_SIXLOWPAN_CTX_SIZE)) {
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return NULL;
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}
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mutex_lock(&_ctx_mutex);
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_ctxs[id].ltime = ltime;
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if (ltime == 0) {
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mutex_unlock(&_ctx_mutex);
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DEBUG("6lo ctx: remove context (%u, %s/%" PRIu8 ")\n", id,
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ng_ipv6_addr_to_str(ipv6str, &_ctxs[id].prefix, sizeof(ipv6str)),
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_ctxs[id].prefix_len);
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return NULL;
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}
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/* test prefix_len now so that invalidation is possible regardless of the
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* value. */
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if (prefix_len == 0) {
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mutex_unlock(&_ctx_mutex);
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_ctxs[id].ltime = 0;
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return NULL;
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}
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if (prefix_len > NG_IPV6_ADDR_BIT_LEN) {
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_ctxs[id].prefix_len = NG_IPV6_ADDR_BIT_LEN;
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}
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else {
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_ctxs[id].prefix_len = prefix_len;
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}
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_ctxs[id].id = id;
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if (!ng_ipv6_addr_equal(&(_ctxs[id].prefix), prefix)) {
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ng_ipv6_addr_set_unspecified(&(_ctxs[id].prefix));
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ng_ipv6_addr_init_prefix(&(_ctxs[id].prefix), prefix,
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_ctxs[id].prefix_len);
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}
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DEBUG("6lo ctx: update context (%u, %s/%" PRIu8 "), lifetime: %" PRIu16 " min\n",
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id, ng_ipv6_addr_to_str(ipv6str, &_ctxs[id].prefix, sizeof(ipv6str)),
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_ctxs[id].prefix_len, _ctxs[id].ltime);
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_ctx_inval_times[id] = ltime + _current_minute();
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mutex_unlock(&_ctx_mutex);
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return _ctxs + id;
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}
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static uint32_t _current_minute(void)
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{
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timex_t now;
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vtimer_now(&now);
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return now.seconds / 60;
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}
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static void _update_lifetime(unsigned int id)
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{
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uint32_t now;
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if (_ctxs[id].ltime == 0) {
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return;
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}
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now = _current_minute();
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if (now >= _ctx_inval_times[id]) {
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DEBUG("6lo ctx: context %u was invalidated\n", id);
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_ctxs[id].ltime = 0;
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}
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else {
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_ctxs[id].ltime = (uint16_t)(_ctx_inval_times[id] - now);
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}
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}
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/** @} */
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