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| 1 | /* Definitions for Address Resolution Protocol. |
|---|---|
| 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | /* Based on the 4.4BSD and Linux version of this file. */ |
| 20 | |
| 21 | #ifndef _NET_IF_ARP_H |
| 22 | |
| 23 | #define _NET_IF_ARP_H 1 |
| 24 | #include <sys/cdefs.h> |
| 25 | |
| 26 | #include <sys/types.h> |
| 27 | #include <sys/socket.h> |
| 28 | #include <stdint.h> |
| 29 | |
| 30 | __BEGIN_DECLS |
| 31 | |
| 32 | /* Some internals from deep down in the kernel. */ |
| 33 | #define MAX_ADDR_LEN 7 |
| 34 | |
| 35 | |
| 36 | /* This structure defines an ethernet arp header. */ |
| 37 | |
| 38 | /* ARP protocol opcodes. */ |
| 39 | #define ARPOP_REQUEST 1 /* ARP request. */ |
| 40 | #define ARPOP_REPLY 2 /* ARP reply. */ |
| 41 | #define ARPOP_RREQUEST 3 /* RARP request. */ |
| 42 | #define ARPOP_RREPLY 4 /* RARP reply. */ |
| 43 | |
| 44 | /* See RFC 826 for protocol description. ARP packets are variable |
| 45 | in size; the arphdr structure defines the fixed-length portion. |
| 46 | Protocol type values are the same as those for 10 Mb/s Ethernet. |
| 47 | It is followed by the variable-sized fields ar_sha, arp_spa, |
| 48 | arp_tha and arp_tpa in that order, according to the lengths |
| 49 | specified. Field names used correspond to RFC 826. */ |
| 50 | |
| 51 | struct arphdr |
| 52 | { |
| 53 | unsigned short int ar_hrd; /* Format of hardware address. */ |
| 54 | unsigned short int ar_pro; /* Format of protocol address. */ |
| 55 | unsigned char ar_hln; /* Length of hardware address. */ |
| 56 | unsigned char ar_pln; /* Length of protocol address. */ |
| 57 | unsigned short int ar_op; /* ARP opcode (command). */ |
| 58 | #if 0 |
| 59 | /* Ethernet looks like this : This bit is variable sized |
| 60 | however... */ |
| 61 | unsigned char __ar_sha[ETH_ALEN]; /* Sender hardware address. */ |
| 62 | unsigned char __ar_sip[4]; /* Sender IP address. */ |
| 63 | unsigned char __ar_tha[ETH_ALEN]; /* Target hardware address. */ |
| 64 | unsigned char __ar_tip[4]; /* Target IP address. */ |
| 65 | #endif |
| 66 | }; |
| 67 | |
| 68 | |
| 69 | /* ARP protocol HARDWARE identifiers. */ |
| 70 | #define ARPHRD_NETROM 0 /* From KA9Q: NET/ROM pseudo. */ |
| 71 | #define ARPHRD_ETHER 1 /* Ethernet 10Mbps. */ |
| 72 | #define ARPHRD_EETHER 2 /* Experimental Ethernet. */ |
| 73 | #define ARPHRD_AX25 3 /* AX.25 Level 2. */ |
| 74 | #define ARPHRD_PRONET 4 /* PROnet token ring. */ |
| 75 | #define ARPHRD_CHAOS 5 /* Chaosnet. */ |
| 76 | #define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB. */ |
| 77 | #define ARPHRD_ARCNET 7 /* ARCnet. */ |
| 78 | #define ARPHRD_APPLETLK 8 /* APPLEtalk. */ |
| 79 | #define ARPHRD_DLCI 15 /* Frame Relay DLCI. */ |
| 80 | #define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id). */ |
| 81 | |
| 82 | /* Dummy types for non ARP hardware */ |
| 83 | #define ARPHRD_SLIP 256 |
| 84 | #define ARPHRD_CSLIP 257 |
| 85 | #define ARPHRD_SLIP6 258 |
| 86 | #define ARPHRD_CSLIP6 259 |
| 87 | #define ARPHRD_RSRVD 260 /* Notional KISS type. */ |
| 88 | #define ARPHRD_ADAPT 264 |
| 89 | #define ARPHRD_ROSE 270 |
| 90 | #define ARPHRD_X25 271 /* CCITT X.25. */ |
| 91 | #define ARPHRD_PPP 512 |
| 92 | #define ARPHRD_HDLC 513 /* (Cisco) HDLC. */ |
| 93 | #define ARPHRD_LAPB 516 /* LAPB. */ |
| 94 | |
| 95 | #define ARPHRD_TUNNEL 768 /* IPIP tunnel. */ |
| 96 | #define ARPHRD_TUNNEL6 769 /* IPIP6 tunnel. */ |
| 97 | #define ARPHRD_FRAD 770 /* Frame Relay Access Device. */ |
| 98 | #define ARPHRD_SKIP 771 /* SKIP vif. */ |
| 99 | #define ARPHRD_LOOPBACK 772 /* Loopback device. */ |
| 100 | #define ARPHRD_LOCALTLK 773 /* Localtalk device. */ |
| 101 | #define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface. */ |
| 102 | #define ARPHRD_BIF 775 /* AP1000 BIF. */ |
| 103 | #define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4. */ |
| 104 | |
| 105 | |
| 106 | /* ARP ioctl request. */ |
| 107 | struct arpreq |
| 108 | { |
| 109 | struct sockaddr arp_pa; /* Protocol address. */ |
| 110 | struct sockaddr arp_ha; /* Hardware address. */ |
| 111 | int arp_flags; /* Flags. */ |
| 112 | struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */ |
| 113 | char arp_dev[16]; |
| 114 | }; |
| 115 | |
| 116 | /* ARP Flag values. */ |
| 117 | #define ATF_COM 0x02 /* Completed entry (ha valid). */ |
| 118 | #define ATF_PERM 0x04 /* Permanent entry. */ |
| 119 | #define ATF_PUBL 0x08 /* Publish entry. */ |
| 120 | #define ATF_USETRAILERS 0x10 /* Has requested trailers. */ |
| 121 | #define ATF_NETMASK 0x20 /* Want to use a netmask (only |
| 122 | for proxy entries). */ |
| 123 | #define ATF_DONTPUB 0x40 /* Don't answer this addresses. */ |
| 124 | #define ATF_MAGIC 0x80 /* Automatically added entry. */ |
| 125 | |
| 126 | |
| 127 | /* Support for the user space arp daemon, arpd. */ |
| 128 | #define ARPD_UPDATE 0x01 |
| 129 | #define ARPD_LOOKUP 0x02 |
| 130 | #define ARPD_FLUSH 0x03 |
| 131 | |
| 132 | struct arpd_request |
| 133 | { |
| 134 | unsigned short int req; /* Request type. */ |
| 135 | uint32_t ip; /* IP address of entry. */ |
| 136 | unsigned long int dev; /* Device entry is tied to. */ |
| 137 | unsigned long int stamp; |
| 138 | unsigned long int updated; |
| 139 | unsigned char ha[MAX_ADDR_LEN]; /* Hardware address. */ |
| 140 | }; |
| 141 | |
| 142 | __END_DECLS |
| 143 | |
| 144 | #endif /* net/if_arp.h */ |
| 145 |
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