linux/include/linux/ip.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Definitions for the IP protocol.
 *
 * Version:	@(#)ip.h	1.0.2	04/28/93
 *
 * Authors:	Fred N. van Kempen, <[email protected]>
 */
#ifndef _LINUX_IP_H
#define _LINUX_IP_H

#include <linux/skbuff.h>
#include <uapi/linux/ip.h>

static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
{ … }

static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
{ … }

static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
{ … }

static inline unsigned int ip_transport_len(const struct sk_buff *skb)
{ … }

static inline unsigned int iph_totlen(const struct sk_buff *skb, const struct iphdr *iph)
{ … }

static inline unsigned int skb_ip_totlen(const struct sk_buff *skb)
{ … }

/* IPv4 datagram length is stored into 16bit field (tot_len) */
#define IP_MAX_MTU …

static inline void iph_set_totlen(struct iphdr *iph, unsigned int len)
{ … }
#endif	/* _LINUX_IP_H */