nd.h

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/*
 * SPDX-FileCopyrightText: 2015 Martine Lenders <mlenders@inf.fu-berlin.de>
 * SPDX-License-Identifier: LGPL-2.1-only
 */
 
#pragma once

 
#include <stdint.h>
 
#include "byteorder.h"
#include "net/eui64.h"
#include "net/ipv6/addr.h"
 
#ifdef __cplusplus
extern "C" {
#endif

#define SIXLOWPAN_ND_OPT_6CTX_LEN_MIN           (2U)
#define SIXLOWPAN_ND_OPT_6CTX_LEN_MAX           (3U)
#define SIXLOWPAN_ND_OPT_AR_LEN                 (2U)
#define SIXLOWPAN_ND_OPT_ABR_LEN                (3U)

#define SIXLOWPAN_ND_OPT_ABR_LTIME_DEFAULT      (10000U)

#define SIXLOWPAN_ND_STATUS_SUCCESS             (0) 
#define SIXLOWPAN_ND_STATUS_DUP                 (1) 
#define SIXLOWPAN_ND_STATUS_NC_FULL             (2) 

#define SIXLOWPAN_ND_OPT_6CTX_FLAGS_MASK        (0x1f)
#define SIXLOWPAN_ND_OPT_6CTX_FLAGS_C           (0x10)  
#define SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK    (0x0f)  

#define SIXLOWPAN_ND_MIN_CTX_CHANGE_SEC_DELAY   (300U)  

#define SIXLOWPAN_ND_MAX_RA_NUMOF               (3U)        
#define SIXLOWPAN_ND_MIN_MS_DELAY_BETWEEN_RAS   (10000U)    
#define SIXLOWPAN_ND_MAX_RA_MS_DELAY            (2000U)     
#define SIXLOWPAN_ND_TENTATIVE_NCE_SEC_LTIME    (20U)       

#define SIXLOWPAN_ND_MULTIHOP_HL                (64U)       

#define SIXLOWPAN_ND_REG_TRANSMIT_NUMOF         (3U)
#define SIXLOWPAN_ND_RS_MSEC_INTERVAL           (10000U)
#define SIXLOWPAN_ND_MAX_RS_NUMOF               (3U)        
#define SIXLOWPAN_ND_MAX_RS_SEC_INTERVAL        (60U)

typedef struct __attribute__((packed)) {
    uint8_t type;           
    uint8_t code;           
    network_uint16_t csum;  
    uint8_t status;         
    uint8_t resv;           
    network_uint16_t ltime; 
    eui64_t eui64;          
    ipv6_addr_t addr;       
} sixlowpan_nd_da_t;

typedef struct __attribute__((packed)) {
    uint8_t type;           
    uint8_t len;            
    uint8_t status;         
    uint8_t resv[3];        
    network_uint16_t ltime; 
    eui64_t eui64;          
} sixlowpan_nd_opt_ar_t;

typedef struct __attribute__((packed)) {
    uint8_t type;           
    uint8_t len;            
    uint8_t ctx_len;        
    uint8_t resv_c_cid;     
    network_uint16_t resv;  
    network_uint16_t ltime; 
} sixlowpan_nd_opt_6ctx_t;

typedef struct __attribute__((packed)) {
    uint8_t type;           
    uint8_t len;            
    network_uint16_t vlow;  
    network_uint16_t vhigh; 
    network_uint16_t ltime; 
    ipv6_addr_t braddr;     
} sixlowpan_nd_opt_abr_t;

static inline bool sixlowpan_nd_opt_6ctx_is_comp(const sixlowpan_nd_opt_6ctx_t *ctx_opt)
{
    return (bool)(ctx_opt->resv_c_cid & SIXLOWPAN_ND_OPT_6CTX_FLAGS_C);
}

static inline uint8_t sixlowpan_nd_opt_6ctx_get_cid(const sixlowpan_nd_opt_6ctx_t *ctx_opt)
{
    return (ctx_opt->resv_c_cid & SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK);
}

static inline void sixlowpan_nd_opt_6ctx_set_cid(sixlowpan_nd_opt_6ctx_t *ctx_opt, uint8_t cid)
{
    ctx_opt->resv_c_cid &= ~SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK;
    ctx_opt->resv_c_cid |= (SIXLOWPAN_ND_OPT_6CTX_FLAGS_CID_MASK & cid);
}

static inline uint32_t sixlowpan_nd_opt_abr_get_version(const sixlowpan_nd_opt_abr_t *abr_opt)
{
    return ((uint32_t)byteorder_ntohs(abr_opt->vlow)) |
           (((uint32_t)byteorder_ntohs(abr_opt->vhigh)) << 16);
}

static inline void sixlowpan_nd_opt_abr_set_version(sixlowpan_nd_opt_abr_t *abr_opt,
                                                    uint32_t version)
{
    abr_opt->vlow = byteorder_htons((uint16_t)(version & 0xffff));
    abr_opt->vhigh = byteorder_htons((uint16_t)(version >> 16));
}

static inline uint16_t gnrc_sixlowpan_nd_opt_get_ltime(const sixlowpan_nd_opt_abr_t *abr_opt)
{
    uint16_t ltime = byteorder_ntohs(abr_opt->ltime);
    return (ltime == 0) ? SIXLOWPAN_ND_OPT_ABR_LTIME_DEFAULT : ltime;
}
 
#ifdef __cplusplus
}
#endif