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/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file mapme.h
* @brief MAP-Me anchorless producer mobility management.
*/
#ifndef HICN_MAPME_H
#define HICN_MAPME_H
#include <stdint.h> // u32
#include <stdbool.h>
#include "common.h"
#include "protocol.h"
#include "ops.h"
/**
* @brief MAP-Me configuration options
*/
typedef struct
{
/** MAP-Me enabled flag (default: false) */
bool enabled;
/** timescale (T_U parameter) in ms (default: 0 for no notifications) */
u32 timescale;
/** retransmission timer in ms (default: 50) */
u32 retx;
/**
* Discovery enabled flag (default: true, should be true if mandatory is
* notifications are enabled)
*/
bool discovery;
} hicn_mapme_conf_t;
/** @brief Default MAP-Me configuration */
static const hicn_mapme_conf_t hicn_mapme_conf = {
ATTR_INIT (enabled, false),
ATTR_INIT (timescale, 0),
ATTR_INIT (retx, 50),
ATTR_INIT (discovery, true),
};
/** @brief MAP-Me update sequence number */
typedef u32 seq_t;
/** @brief MAP-Me packet types */
typedef enum
{
UNKNOWN,
UPDATE,
UPDATE_ACK,
NOTIFICATION,
NOTIFICATION_ACK,
} hicn_mapme_type_t;
/** @brief MAP-Me parameters (excluding those contained in * hicn_prefix_t) */
typedef struct
{
int protocol;
hicn_mapme_type_t type;
seq_t seq;
} mapme_params_t;
/* MAP-Me API */
size_t hicn_mapme_create_packet (u8 * buf, const hicn_prefix_t * prefix,
const mapme_params_t * params);
size_t hicn_mapme_create_ack (u8 * buf, const mapme_params_t * params);
int hicn_mapme_parse_packet (const u8 * packet, hicn_prefix_t * prefix,
mapme_params_t * params);
/* Implementation & parsing : ICMP Redirect */
#define HICN_MAPME_ACK_FLAG (0x20 | 0x60)
#define HICN_MAPME_ICMP_TYPE_IPV4 5
#define HICN_MAPME_ICMP_TYPE_IPV6 137
#define HICN_MAPME_ICMP_TYPE_ACK_IPV4 (HICN_MAPME_ICMP_TYPE_IPV4 | HICN_MAPME_ACK_FLAG)
#define HICN_MAPME_ICMP_TYPE_ACK_IPV6 (HICN_MAPME_ICMP_TYPE_IPV6 | HICN_MAPME_ACK_FLAG)
#define HICN_MAPME_ICMP_CODE 0 /* Redirect Datagrams for the Network (or subnet) */
#define HICN_MAPME_TYPE_IS_IU(type) ((type == HICN_MAPME_ICMP_TYPE_IPV4) || (type == HICN_MAPME_ICMP_TYPE_IPV6))
#define HICN_MAPME_TYPE_IS_IU_ACK(type) ((type == HICN_MAPME_ICMP_TYPE_ACK_IPV4) || (type == HICN_MAPME_ICMP_TYPE_ACK_IPV6))
#define HICN_MAPME_IS_IU(type, code) (HICN_MAPME_TYPE_IS_IU(type) && (code == HICN_MAPME_ICMP_CODE))
#define HICN_MAPME_IS_ACK(type, code) (HICN_MAPME_TYPE_IS_IU_ACK(type) && (code == HICN_MAPME_ICMP_CODE))
#define HICN_IS_MAPME(type, code) (HICN_MAPME_IS_IU(type, code) || HICN_MAPME_IS_ACK(type, code))
/* Fast check for ACK flag */
#define HICN_MAPME_IS_ACK_FAST(icmp_type) (icmp_type & HICN_MAPME_ACK_FLAG)
/* Default TTL */
#define HICN_MAPME_TTL 255 // typical for redirect (ref?)
/*
* The length of the MAPME4 header struct must be 120 bytes.
*/
#define EXPECTED_MAPME_V4_HDRLEN 120
/** @brief MAP-Me packet header for IPv4 */
typedef struct
{
_ipv4_header_t ip;
_icmprd4_header_t icmp_rd;
seq_t seq;
u8 len;
u8 _pad[3];
} hicn_mapme_v4_header_t;
/*
* The length of the MAPME4 header struct must be bytes.
*/
#define EXPECTED_MAPME_V6_HDRLEN 88
/** @brief MAP-Me packet header for IPv6 */
typedef struct
{
_ipv6_header_t ip;
_icmprd_header_t icmp_rd;
seq_t seq;
u8 len;
u8 _pad[3];
} hicn_mapme_v6_header_t;
/** @brief MAP-Me packet header (IP version agnostic) */
typedef union
{
hicn_mapme_v4_header_t v4;
hicn_mapme_v6_header_t v6;
} hicn_mapme_header_t;
#define HICN_MAPME_V4_HDRLEN sizeof(hicn_mapme_v4_header_t)
#define HICN_MAPME_V6_HDRLEN sizeof(hicn_mapme_v6_header_t)
static_assert (EXPECTED_MAPME_V4_HDRLEN == HICN_MAPME_V4_HDRLEN,
"Size of MAPME_V4 struct does not match its expected size.");
static_assert (EXPECTED_MAPME_V6_HDRLEN == HICN_MAPME_V6_HDRLEN,
"Size of MAPME_V6 struct does not match its expected size.");
#endif /* HICN_MAPME_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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