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/*
* Copyright (c) 2021 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 header.h
* @brief hICN header data structures.
*
* NOTE: These structures are used as convenient facade for accessing
* the encapsulated headers. They are not written taking compiler padding
* into account, then a sizeof() on these struct could not give the expected
* result. For accessing the size of the hicn headers use the macros at the end
* of this file.
*/
#ifndef HICN_HEADER_H
#define HICN_HEADER_H
#include "common.h"
#include "protocol.h"
typedef struct
{
_ipv6_header_t ip;
union
{
_tcp_header_t tcp;
struct
{
_udp_header_t udp;
_new_header_t newhdr;
};
_icmp_header_t icmp;
_icmp_wldr_header_t wldr;
};
} hicn_v6_hdr_t;
typedef struct
{
_ipv6_header_t ip;
union
{
struct
{
_tcp_header_t tcp;
_ah_header_t ah;
};
struct
{
_udp_header_t udp;
_new_header_t newhdr;
_ah_header_t udp_ah;
};
struct
{
_icmp_header_t icmp;
_ah_header_t icmp_ah;
};
};
} hicn_v6ah_hdr_t;
// For ipv4 we need to use packed structs as fields may be aligned to 64 bits
// (So for instance tcp header may start at byte #24 instead of byte 20)
typedef PACKED (struct {
_ipv4_header_t ip;
union
{
_tcp_header_t tcp;
struct
{
_udp_header_t udp;
_new_header_t newhdr;
};
_icmp_header_t icmp;
_icmp_wldr_header_t wldr;
};
}) hicn_v4_hdr_t;
typedef PACKED (struct {
_ipv4_header_t ip;
union
{
struct
{
_tcp_header_t tcp;
_ah_header_t ah;
};
struct
{
_udp_header_t udp;
_new_header_t newhdr;
_ah_header_t udp_ah;
};
struct
{
_icmp_header_t icmp;
_ah_header_t icmp_ah;
};
};
}) hicn_v4ah_hdr_t;
typedef union
{
/* To deprecate as redundant with hicn_type_t */
hicn_v6_hdr_t v6;
hicn_v6ah_hdr_t v6ah;
hicn_v4_hdr_t v4;
hicn_v4ah_hdr_t v4ah;
hicn_protocol_t protocol;
} hicn_header_t;
#define HICN_V6_TCP_HDRLEN (IPV6_HDRLEN + TCP_HDRLEN)
#define HICN_V6_ICMP_HDRLEN (IPV6_HDRLEN + ICMP_HDRLEN)
#define HICN_V6_WLDR_HDRLEN (IPV6_HDRLEN + ICMPWLDR_HDRLEN)
#define HICN_V6_TCP_AH_HDRLEN (HICN_V6_TCP_HDRLEN + AH_HDRLEN)
#define HICN_V6_ICMP_AH_HDRLEN (HICN_V6_ICMP_HDRLEN + AH_HDRLEN)
#define HICN_V4_TCP_HDRLEN (IPV4_HDRLEN + TCP_HDRLEN)
#define HICN_V4_ICMP_HDRLEN (IPV4_HDRLEN + ICMP_HDRLEN)
#define HICN_V4_WLDR_HDRLEN (IPV4_HDRLEN + ICMPWLDR_HDRLEN)
#define HICN_V4_TCP_AH_HDRLEN (HICN_V4_TCP_HDRLEN + AH_HDRLEN)
#define HICN_V4_ICMP_AH_HDRLEN (HICN_V4_ICMP_HDRLEN + AH_HDRLEN)
#define HICN_DEFAULT_PORT 9695
#endif /* HICN_HEADER_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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