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 arp_hdr(const struct sk_buff * skb)25static inline struct arphdr *arp_hdr(const struct sk_buff *skb) 26 { 27 return (struct arphdr *)skb_network_header(skb); 28 } 29 arp_hdr_len(const struct net_device * dev)30static 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 dev_is_mac_header_xmit(const struct net_device * dev)44static 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_IP6GRE: 52 case ARPHRD_VOID: 53 case ARPHRD_NONE: 54 case ARPHRD_RAWIP: 55 case ARPHRD_PIMREG: 56 /* PPP adds its l2 header automatically in ppp_start_xmit(). 57 * This makes it look like an l3 device to __bpf_redirect() and tcf_mirred_init(). 58 */ 59 case ARPHRD_PPP: 60 return false; 61 default: 62 return true; 63 } 64 } 65 66 #endif /* _LINUX_IF_ARP_H */ 67