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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960/* 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, <waltje@uWalt.NL.Mugnet.ORG> */#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){ return (struct iphdr *)skb_network_header(skb);}
static inline struct iphdr *inner_ip_hdr(const struct sk_buff *skb){ return (struct iphdr *)skb_inner_network_header(skb);}
static inline struct iphdr *ipip_hdr(const struct sk_buff *skb){ return (struct iphdr *)skb_transport_header(skb);}
static inline unsigned int ip_transport_len(const struct sk_buff *skb){ return ntohs(ip_hdr(skb)->tot_len) - skb_network_header_len(skb);}
static inline unsigned int iph_totlen(const struct sk_buff *skb, const struct iphdr *iph){ u32 len = ntohs(iph->tot_len);
return (len || !skb_is_gso(skb) || !skb_is_gso_tcp(skb)) ? len : skb->len - skb_network_offset(skb);}
static inline unsigned int skb_ip_totlen(const struct sk_buff *skb){ return iph_totlen(skb, ip_hdr(skb));}
/* IPv4 datagram length is stored into 16bit field (tot_len) */#define IP_MAX_MTU 0xFFFFU
static inline void iph_set_totlen(struct iphdr *iph, unsigned int len){ iph->tot_len = len <= IP_MAX_MTU ? htons(len) : 0;}#endif /* _LINUX_IP_H */