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Linux/include/linux/if_arp.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  *              Global definitions for the ARP (RFC 826) protocol.
  8  *
  9  * Version:     @(#)if_arp.h    1.0.1   04/16/93
 10  *
 11  * Authors:     Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988
 12  *              Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source.
 13  *              Ross Biro
 14  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 15  *              Florian La Roche,
 16  *              Jonathan Layes <layes@loran.com>
 17  *              Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25
 18  */
 19 #ifndef _LINUX_IF_ARP_H
 20 #define _LINUX_IF_ARP_H
 21 
 22 #include <linux/skbuff.h>
 23 #include <uapi/linux/if_arp.h>
 24 
 25 static inline struct arphdr *arp_hdr(const struct sk_buff *skb)
 26 {
 27         return (struct arphdr *)skb_network_header(skb);
 28 }
 29 
 30 static inline unsigned int arp_hdr_len(const struct net_device *dev)
 31 {
 32         switch (dev->type) {
 33 #if IS_ENABLED(CONFIG_FIREWIRE_NET)
 34         case ARPHRD_IEEE1394:
 35                 /* ARP header, device address and 2 IP addresses */
 36                 return sizeof(struct arphdr) + dev->addr_len + sizeof(u32) * 2;
 37 #endif
 38         default:
 39                 /* ARP header, plus 2 device addresses, plus 2 IP addresses. */
 40                 return sizeof(struct arphdr) + (dev->addr_len + sizeof(u32)) * 2;
 41         }
 42 }
 43 
 44 static inline bool dev_is_mac_header_xmit(const struct net_device *dev)
 45 {
 46         switch (dev->type) {
 47         case ARPHRD_TUNNEL:
 48         case ARPHRD_TUNNEL6:
 49         case ARPHRD_SIT:
 50         case ARPHRD_IPGRE:
 51         case ARPHRD_VOID:
 52         case ARPHRD_NONE:
 53         case ARPHRD_RAWIP:
 54                 return false;
 55         default:
 56                 return true;
 57         }
 58 }
 59 
 60 #endif  /* _LINUX_IF_ARP_H */
 61 

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