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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_TCP_H
#define HICN_PROTOCOL_TCP_H
#include <hicn/base.h>
#include <hicn/common.h>
#include <hicn/name.h>
/*
* The length of the TCP header struct must be 20 bytes.
*/
#define EXPECTED_TCP_HDRLEN 20
/*
* NOTE: bitfields are problematic for portability reasons. There are provided
* here for reference and documentation purposes, we might just provide a macro
* to disable and use it instead of __BYTE_ORDER__.
*/
typedef struct
{
u16 sport;
u16 dport;
union
{
u32 seq;
hicn_name_suffix_t name_suffix;
};
union
{
u32 seq_ack;
struct
{
hicn_path_label_t pathlabel;
u8 pad[3];
};
};
union
{
struct
{
u8 data_offset_and_reserved;
u8 flags;
};
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
struct
{
u16 reserved : 4;
u16 doff : 4;
u16 fin : 1;
u16 syn : 1;
u16 rst : 1;
u16 psh : 1;
u16 ack : 1;
u16 urg : 1;
u16 ece : 1;
u16 cwr : 1;
};
struct
{ /* __ denotes unchanged bitfields */
u16 timescale : 4;
u16 __doff : 4;
u16 __fin : 1;
u16 __syn : 1;
u16 __rst : 1;
u16 sig : 1;
u16 __ack : 1;
u16 man : 1;
u16 id : 1;
u16 __cwr : 1;
};
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
struct
{
u16 doff : 4;
u16 reserved : 4;
u16 cwr : 1;
u16 ece : 1;
u16 urg : 1;
u16 ack : 1;
u16 psh : 1;
u16 rst : 1;
u16 syn : 1;
u16 fin : 1;
};
struct
{
u16 __doff : 4;
u16 timescale : 4;
u16 __cwr : 1;
u16 id : 1 u16 man : 1;
u16 __ack : 1;
u16 sig : 1;
u16 __rst : 1;
u16 __syn : 1;
u16 __fin : 1;
};
#endif
};
union
{
u16 window;
u16 ldr;
};
u16 csum;
union
{
u16 urg_ptr;
u16 lifetime;
};
} _tcp_header_t;
#define TCP_HDRLEN sizeof (_tcp_header_t)
static_assert (EXPECTED_TCP_HDRLEN == TCP_HDRLEN,
"Size of TCP struct does not match its expected size.");
/* TCP flags bit 0 first. */
#define foreach_tcp_flag \
_ (FIN) /**< No more data from sender. */ \
_ (SYN) /**< Synchronize sequence numbers. */ \
_ (RST) /**< Reset the connection. */ \
_ (PSH) /**< Push function. */ \
_ (ACK) /**< Ack field significant. */ \
_ (URG) /**< Urgent pointer field significant. */ \
_ (ECE) /**< ECN-echo. Receiver got CE packet */ \
_ (CWR) /**< Sender reduced congestion window */
enum
{
#define _(f) HICN_TCP_FLAG_BIT_##f,
foreach_tcp_flag
#undef _
HICN_TCP_N_FLAG_BITS,
};
enum
{
#define _(f) HICN_TCP_FLAG_##f = 1 << HICN_TCP_FLAG_BIT_##f,
foreach_tcp_flag
#undef _
};
#endif /* HICN_PROTOCOL_TCP_H */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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