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TOMOYO Linux Cross Reference
Linux/include/linux/ip.h

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  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 
 19 static inline struct iphdr *ip_hdr(const struct sk_buff *skb)
 20 {
 21         return (struct iphdr *)skb_network_header(skb);
 22 }
 23 
 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 
 29 static inline struct iphdr *ipip_hdr(const struct sk_buff *skb)
 30 {
 31         return (struct iphdr *)skb_transport_header(skb);
 32 }
 33 
 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 

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