include/linux/ip.h

Source file repositories/reference/linux-study-clean/include/linux/ip.h

File Facts

System
Linux kernel
Corpus path
include/linux/ip.h
Extension
.h
Size
1593 bytes
Lines
60
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#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 */

Annotation

Implementation Notes