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/* Definitions for Address Resolution Protocol. Copyright (C) 1997-2024 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ /* Based on the 4.4BSD and Linux version of this file. */ #ifndef _NET_IF_ARP_H #define _NET_IF_ARP_H 1 #include <sys/types.h> #include <sys/socket.h> #include <stdint.h> __BEGIN_DECLS /* Some internals from deep down in the kernel. */ #define MAX_ADDR_LEN 7 /* This structure defines an ethernet arp header. */ /* ARP protocol opcodes. */ #define ARPOP_REQUEST 1 /* ARP request. */ #define ARPOP_REPLY 2 /* ARP reply. */ #define ARPOP_RREQUEST 3 /* RARP request. */ #define ARPOP_RREPLY 4 /* RARP reply. */ #define ARPOP_InREQUEST 8 /* InARP request. */ #define ARPOP_InREPLY 9 /* InARP reply. */ #define ARPOP_NAK 10 /* (ATM)ARP NAK. */ /* See RFC 826 for protocol description. ARP packets are variable in size; the arphdr structure defines the fixed-length portion. Protocol type values are the same as those for 10 Mb/s Ethernet. It is followed by the variable-sized fields ar_sha, arp_spa, arp_tha and arp_tpa in that order, according to the lengths specified. Field names used correspond to RFC 826. */ struct arphdr { unsigned short int ar_hrd; /* Format of hardware address. */ unsigned short int ar_pro; /* Format of protocol address. */ unsigned char ar_hln; /* Length of hardware address. */ unsigned char ar_pln; /* Length of protocol address. */ unsigned short int ar_op; /* ARP opcode (command). */ #if 0 /* Ethernet looks like this : This bit is variable sized however... */ unsigned char __ar_sha[ETH_ALEN]; /* Sender hardware address. */ unsigned char __ar_sip[4]; /* Sender IP address. */ unsigned char __ar_tha[ETH_ALEN]; /* Target hardware address. */ unsigned char __ar_tip[4]; /* Target IP address. */ #endif }; /* ARP protocol HARDWARE identifiers. */ #define ARPHRD_NETROM 0 /* From KA9Q: NET/ROM pseudo. */ #define ARPHRD_ETHER 1 /* Ethernet 10/100Mbps. */ #define ARPHRD_EETHER 2 /* Experimental Ethernet. */ #define ARPHRD_AX25 3 /* AX.25 Level 2. */ #define ARPHRD_PRONET 4 /* PROnet token ring. */ #define ARPHRD_CHAOS 5 /* Chaosnet. */ #define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB. */ #define ARPHRD_ARCNET 7 /* ARCnet. */ #define ARPHRD_APPLETLK 8 /* APPLEtalk. */ #define ARPHRD_DLCI 15 /* Frame Relay DLCI. */ #define ARPHRD_ATM 19 /* ATM. */ #define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id). */ #define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734. */ #define ARPHRD_EUI64 27 /* EUI-64. */ #define ARPHRD_INFINIBAND 32 /* InfiniBand. */ /* Dummy types for non ARP hardware */ #define ARPHRD_SLIP 256 #define ARPHRD_CSLIP 257 #define ARPHRD_SLIP6 258 #define ARPHRD_CSLIP6 259 #define ARPHRD_RSRVD 260 /* Notional KISS type. */ #define ARPHRD_ADAPT 264 #define ARPHRD_ROSE 270 #define ARPHRD_X25 271 /* CCITT X.25. */ #define ARPHRD_HWX25 272 /* Boards with X.25 in firmware. */ #define ARPHRD_CAN 280 /* Controller Area Network. */ #define ARPHRD_MCTP 290 #define ARPHRD_PPP 512 #define ARPHRD_CISCO 513 /* Cisco HDLC. */ #define ARPHRD_HDLC ARPHRD_CISCO #define ARPHRD_LAPB 516 /* LAPB. */ #define ARPHRD_DDCMP 517 /* Digital's DDCMP. */ #define ARPHRD_RAWHDLC 518 /* Raw HDLC. */ #define ARPHRD_RAWIP 519 /* Raw IP. */ #define ARPHRD_TUNNEL 768 /* IPIP tunnel. */ #define ARPHRD_TUNNEL6 769 /* IPIP6 tunnel. */ #define ARPHRD_FRAD 770 /* Frame Relay Access Device. */ #define ARPHRD_SKIP 771 /* SKIP vif. */ #define ARPHRD_LOOPBACK 772 /* Loopback device. */ #define ARPHRD_LOCALTLK 773 /* Localtalk device. */ #define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface. */ #define ARPHRD_BIF 775 /* AP1000 BIF. */ #define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4. */ #define ARPHRD_IPDDP 777 /* IP-in-DDP tunnel. */ #define ARPHRD_IPGRE 778 /* GRE over IP. */ #define ARPHRD_PIMREG 779 /* PIMSM register interface. */ #define ARPHRD_HIPPI 780 /* High Performance Parallel I'face. */ #define ARPHRD_ASH 781 /* (Nexus Electronics) Ash. */ #define ARPHRD_ECONET 782 /* Acorn Econet. */ #define ARPHRD_IRDA 783 /* Linux-IrDA. */ #define ARPHRD_FCPP 784 /* Point to point fibrechanel. */ #define ARPHRD_FCAL 785 /* Fibrechanel arbitrated loop. */ #define ARPHRD_FCPL 786 /* Fibrechanel public loop. */ #define ARPHRD_FCFABRIC 787 /* Fibrechanel fabric. */ #define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR. */ #define ARPHRD_IEEE80211 801 /* IEEE 802.11. */ #define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header. */ #define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header. */ #define ARPHRD_IEEE802154 804 /* IEEE 802.15.4 header. */ #define ARPHRD_IEEE802154_PHY 805 /* IEEE 802.15.4 PHY header. */ #define ARPHRD_VOID 0xFFFF /* Void type, nothing is known. */ #define ARPHRD_NONE 0xFFFE /* Zero header length. */ /* ARP ioctl request. */ struct arpreq { struct sockaddr arp_pa; /* Protocol address. */ struct sockaddr arp_ha; /* Hardware address. */ int arp_flags; /* Flags. */ struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */ char arp_dev[16]; }; struct arpreq_old { struct sockaddr arp_pa; /* Protocol address. */ struct sockaddr arp_ha; /* Hardware address. */ int arp_flags; /* Flags. */ struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */ }; /* ARP Flag values. */ #define ATF_COM 0x02 /* Completed entry (ha valid). */ #define ATF_PERM 0x04 /* Permanent entry. */ #define ATF_PUBL 0x08 /* Publish entry. */ #define ATF_USETRAILERS 0x10 /* Has requested trailers. */ #define ATF_NETMASK 0x20 /* Want to use a netmask (only for proxy entries). */ #define ATF_DONTPUB 0x40 /* Don't answer this addresses. */ #define ATF_MAGIC 0x80 /* Automatically added entry. */ /* Support for the user space arp daemon, arpd. */ #define ARPD_UPDATE 0x01 #define ARPD_LOOKUP 0x02 #define ARPD_FLUSH 0x03 struct arpd_request { unsigned short int req; /* Request type. */ uint32_t ip; /* IP address of entry. */ unsigned long int dev; /* Device entry is tied to. */ unsigned long int stamp; unsigned long int updated; unsigned char ha[MAX_ADDR_LEN]; /* Hardware address. */ }; __END_DECLS #endif /* net/if_arp.h */