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 (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 | |