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/*
* Copyright (c) 2021-2022 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.
*/
#ifndef HICN_PROTOCOL_IPV4
#define HICN_PROTOCOL_IPV4
#include <hicn/util/ip_address.h>
#include <hicn/base.h>
#include <hicn/common.h>
/* Headers were adapted from linux' definitions in netinet/ip.h */
/*
* The length of the IPV4 header struct must be 20 bytes.
*/
#define EXPECTED_IPV4_HDRLEN 20
typedef struct
{
union
{
struct
{
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
u8 ihl : 4;
u8 version : 4;
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
u8 version : 4;
u8 ihl : 4;
#else
#error "Unsupported endianness"
#endif
};
u8 version_ihl;
};
u8 tos;
/*
* This is the total length of the IP packet, including the IP header.
* NOTE: vriable len header size is currently not supported by the lib.
*/
u16 len;
u16 id;
u16 frag_off;
u8 ttl;
u8 protocol;
u16 csum;
ipv4_address_t saddr;
ipv4_address_t daddr;
} _ipv4_header_t;
#define ipv4_header_bytes(ipv4_header) \
(sizeof (u32) * (ipv4_header->version_ihl & 0xf))
#define IPV4_HDRLEN sizeof (_ipv4_header_t)
static_assert (EXPECTED_IPV4_HDRLEN == IPV4_HDRLEN,
"Size of IPV4 struct does not match its expected size.");
/*
* The length of the IPV4 pseudo header struct must be 12 bytes.
*/
#define EXPECTED_IPV4_PSHDRLEN 12
typedef struct
{
ipv4_address_t ip_src;
ipv4_address_t ip_dst;
u8 zero;
u8 protocol;
u16 size;
} ipv4_pseudo_header_t;
#define IPV4_PSHDRLEN sizeof (ipv4_pseudo_header_t)
static_assert (EXPECTED_IPV4_PSHDRLEN == IPV4_PSHDRLEN,
"Size of IPV4_PSHDR struct does not match its expected size.");
/* Default field values */
#define IPV4_DEFAULT_VERSION 4
#define IPV4_DEFAULT_IHL 5
#define IPV4_DEFAULT_TOS 0
#define IPV4_DEFAULT_PAYLOAD_LENGTH 0
#define IPV4_DEFAULT_ID 300
#define IPV4_DEFAULT_FRAG_OFF 0x000
#define IPV4_DEFAULT_TTL 64
#define IPV4_DEFAULT_PROTOCOL IPPROTO_TCP
#define IPV4_DEFAULT_SRC_IP 0, 0, 0, 0
#define IPV4_DEFAULT_DST_IP 0, 0, 0, 0
#endif /* HICN_PROTOCOL_IPV4 */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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