include/linux/if_arp.h

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

File Facts

System
Linux kernel
Corpus path
include/linux/if_arp.h
Extension
.h
Size
1858 bytes
Lines
67
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_IF_ARP_H
#define _LINUX_IF_ARP_H

#include <linux/skbuff.h>
#include <uapi/linux/if_arp.h>

static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
{
	return (struct arphdr *)skb_network_header(skb);
}

static inline unsigned int arp_hdr_len(const struct net_device *dev)
{
	switch (dev->type) {
#if IS_ENABLED(CONFIG_FIREWIRE_NET)
	case ARPHRD_IEEE1394:
		/* ARP header, device address and 2 IP addresses */
		return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
#endif
	default:
		/* ARP header, plus 2 device addresses, plus 2 IP addresses. */
		return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
	}
}

static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
{
	switch (dev->type) {
	case ARPHRD_TUNNEL:
	case ARPHRD_TUNNEL6:
	case ARPHRD_SIT:
	case ARPHRD_IPGRE:
	case ARPHRD_IP6GRE:
	case ARPHRD_VOID:
	case ARPHRD_NONE:
	case ARPHRD_RAWIP:
	case ARPHRD_PIMREG:
	/* PPP adds its l2 header automatically in ppp_start_xmit().
	 * This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init().
	 */
	case ARPHRD_PPP:
		return false;
	default:
		return true;
	}
}

#endif	/* _LINUX_IF_ARP_H */

Annotation

Implementation Notes