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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_IP_H
#define _LINUXKPI_LINUX_IP_H
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <machine/in_cksum.h>
#include <linux/skbuff.h>
/* (u) unconfirmed structure field names; using FreeBSD's meanwhile. */
struct iphdr {
uint8_t ip_hl:4, ip_ver:4; /* (u) */
uint8_t ip_tos; /* (u) */
uint16_t ip_len; /* (u) */
uint16_t id;
uint16_t ip_off; /* (u) */
uint8_t ip_ttl; /* (u) */
uint8_t protocol;
uint16_t check;
uint32_t saddr;
uint32_t daddr;
};
static __inline struct iphdr *
ip_hdr(struct sk_buff *skb)
{
return (struct iphdr *)skb_network_header(skb);
}
static __inline void
ip_send_check(struct iphdr *iph)
{
/* Clear the checksum before computing! */
iph->check = 0;
/* An IPv4 header is the same everywhere even if names differ. */
iph->check = in_cksum_hdr((const void *)iph);
}
#endif /* _LINUXKPI_LINUX_IP_H */
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