1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * INET		An implementation of the TCP/IP protocol suite for the LINUX
4  *		operating system.  INET is implemented using the  BSD Socket
5  *		interface as the means of communication with the user level.
6  *
7  *		Definitions for the IP protocol.
8  *
9  * Version:	@(#)ip.h	1.0.2	04/28/93
10  *
11  * Authors:	Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12  */
13 #ifndef _LINUX_IP_H
14 #define _LINUX_IP_H
15 
16 #include <linux/skbuff.h>
17 #include <uapi/linux/ip.h>
18 
ip_hdr(const struct sk_buff * skb)19 static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
20 {
21 	return (struct iphdr *)skb_network_header(skb);
22 }
23 
inner_ip_hdr(const struct sk_buff * skb)24 static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb)
25 {
26 	return (struct iphdr *)skb_inner_network_header(skb);
27 }
28 
ipip_hdr(const struct sk_buff * skb)29 static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
30 {
31 	return (struct iphdr *)skb_transport_header(skb);
32 }
33 
ip_transport_len(const struct sk_buff * skb)34 static inline unsigned int ip_transport_len(const struct sk_buff *skb)
35 {
36 	return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);
37 }
38 #endif	/* _LINUX_IP_H */
39