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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020-2021 The FreeBSD Foundation
*
* This software was developed by Björn Zeeb under sponsorship from
* the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _LINUXKPI_LINUX_TCP_H
#define _LINUXKPI_LINUX_TCP_H
#include <sys/types.h>
#include <linux/skbuff.h>
/* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */
struct tcphdr {
uint16_t source; /* (u) */
uint16_t dest; /* (u) */
uint32_t th_seq; /* (u) */
uint32_t th_ack; /* (u) */
#if BYTE_ORDER == LITTLE_ENDIAN
uint8_t th_x2:4, doff:4;
#elif BYTE_ORDER == BIG_ENDIAN
uint8_t doff:4, th_x2:4;
#endif
uint8_t th_flags; /* (u) */
uint16_t th_win; /* (u) */
uint16_t check;
uint16_t th_urg; /* (u) */
};
static __inline struct tcphdr *
tcp_hdr(struct sk_buff *skb)
{
return (struct tcphdr *)skb_transport_header(skb);
}
static __inline uint32_t
tcp_hdrlen(struct sk_buff *skb)
{
struct tcphdr *th;
th = tcp_hdr(skb);
return (4 * th->doff);
}
#endif /* _LINUXKPI_LINUX_TCP_H */
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