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- /* 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)
- {
- 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 */
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