diff options
Diffstat (limited to 'include/linux/if_arp.h')
| -rw-r--r-- | include/linux/if_arp.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/include/linux/if_arp.h b/include/linux/if_arp.h new file mode 100644 index 000000000..10a1e8143 --- /dev/null +++ b/include/linux/if_arp.h @@ -0,0 +1,66 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Global definitions for the ARP (RFC 826) protocol. + * + * Version: @(#)if_arp.h 1.0.1 04/16/93 + * + * Authors: Original taken from Berkeley UNIX 4.3, (c) UCB 1986-1988 + * Portions taken from the KA9Q/NOS (v2.00m PA0GRI) source. + * Ross Biro + * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> + * Florian La Roche, + * Jonathan Layes <layes@loran.com> + * Arnaldo Carvalho de Melo <acme@conectiva.com.br> ARPHRD_HWX25 + */ +#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 */ |