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001: /* Definitions for Address Resolution Protocol.
002:    Copyright (C) 1997,1999,2001,2006,2009 Free Software Foundation, Inc.
003:    This file is part of the GNU C Library.
004:    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
005: 
006:    The GNU C Library is free software; you can redistribute it and/or
007:    modify it under the terms of the GNU Lesser General Public
008:    License as published by the Free Software Foundation; either
009:    version 2.1 of the License, or (at your option) any later version.
010: 
011:    The GNU C Library is distributed in the hope that it will be useful,
012:    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:    Lesser General Public License for more details.
015: 
016:    You should have received a copy of the GNU Lesser General Public
017:    License along with the GNU C Library; if not, write to the Free
018:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
019:    02111-1307 USA.  */
020: 
021: /* Based on the 4.4BSD and Linux version of this file.  */
022: 
023: #ifndef _NET_IF_ARP_H
024: 
025: #define _NET_IF_ARP_H 1
026: #include <sys/cdefs.h>
027: 
028: #include <sys/types.h>
029: #include <sys/socket.h>
030: 
031: __BEGIN_DECLS
032: 
033: /* Some internals from deep down in the kernel.  */
034: #define MAX_ADDR_LEN    7
035: 
036: 
037: /* This structure defines an ethernet arp header.  */
038: 
039: /* ARP protocol opcodes. */
040: #define ARPOP_REQUEST   1               /* ARP request.  */
041: #define ARPOP_REPLY     2               /* ARP reply.  */
042: #define ARPOP_RREQUEST  3               /* RARP request.  */
043: #define ARPOP_RREPLY    4               /* RARP reply.  */
044: #define ARPOP_InREQUEST 8               /* InARP request.  */
045: #define ARPOP_InREPLY   9               /* InARP reply.  */
046: #define ARPOP_NAK       10              /* (ATM)ARP NAK.  */
047: 
048: /* See RFC 826 for protocol description.  ARP packets are variable
049:    in size; the arphdr structure defines the fixed-length portion.
050:    Protocol type values are the same as those for 10 Mb/s Ethernet.
051:    It is followed by the variable-sized fields ar_sha, arp_spa,
052:    arp_tha and arp_tpa in that order, according to the lengths
053:    specified.  Field names used correspond to RFC 826.  */
054: 
055: struct arphdr
056:   {
057:     unsigned short int ar_hrd;          /* Format of hardware address.  */
058:     unsigned short int ar_pro;          /* Format of protocol address.  */
059:     unsigned char ar_hln;               /* Length of hardware address.  */
060:     unsigned char ar_pln;               /* Length of protocol address.  */
061:     unsigned short int ar_op;           /* ARP opcode (command).  */
062: #if 0
063:     /* Ethernet looks like this : This bit is variable sized
064:        however...  */
065:     unsigned char __ar_sha[ETH_ALEN];   /* Sender hardware address.  */
066:     unsigned char __ar_sip[4];          /* Sender IP address.  */
067:     unsigned char __ar_tha[ETH_ALEN];   /* Target hardware address.  */
068:     unsigned char __ar_tip[4];          /* Target IP address.  */
069: #endif
070:   };
071: 
072: 
073: /* ARP protocol HARDWARE identifiers. */
074: #define ARPHRD_NETROM   0               /* From KA9Q: NET/ROM pseudo. */
075: #define ARPHRD_ETHER    1               /* Ethernet 10/100Mbps.  */
076: #define ARPHRD_EETHER   2               /* Experimental Ethernet.  */
077: #define ARPHRD_AX25     3               /* AX.25 Level 2.  */
078: #define ARPHRD_PRONET   4               /* PROnet token ring.  */
079: #define ARPHRD_CHAOS    5               /* Chaosnet.  */
080: #define ARPHRD_IEEE802  6               /* IEEE 802.2 Ethernet/TR/TB.  */
081: #define ARPHRD_ARCNET   7               /* ARCnet.  */
082: #define ARPHRD_APPLETLK 8               /* APPLEtalk.  */
083: #define ARPHRD_DLCI     15              /* Frame Relay DLCI.  */
084: #define ARPHRD_ATM      19              /* ATM.  */
085: #define ARPHRD_METRICOM 23              /* Metricom STRIP (new IANA id).  */
086: #define ARPHRD_IEEE1394 24              /* IEEE 1394 IPv4 - RFC 2734.  */
087: #define ARPHRD_EUI64            27              /* EUI-64.  */
088: #define ARPHRD_INFINIBAND       32              /* InfiniBand.  */
089: 
090: /* Dummy types for non ARP hardware */
091: #define ARPHRD_SLIP     256
092: #define ARPHRD_CSLIP    257
093: #define ARPHRD_SLIP6    258
094: #define ARPHRD_CSLIP6   259
095: #define ARPHRD_RSRVD    260             /* Notional KISS type.  */
096: #define ARPHRD_ADAPT    264
097: #define ARPHRD_ROSE     270
098: #define ARPHRD_X25      271             /* CCITT X.25.  */
099: #define ARPHRD_HWX25    272             /* Boards with X.25 in firmware.  */
100: #define ARPHRD_PPP      512
101: #define ARPHRD_CISCO    513             /* Cisco HDLC.  */
102: #define ARPHRD_HDLC     ARPHRD_CISCO
103: #define ARPHRD_LAPB     516             /* LAPB.  */
104: #define ARPHRD_DDCMP    517             /* Digital's DDCMP.  */
105: #define ARPHRD_RAWHDLC  518             /* Raw HDLC.  */
106: 
107: #define ARPHRD_TUNNEL   768             /* IPIP tunnel.  */
108: #define ARPHRD_TUNNEL6  769             /* IPIP6 tunnel.  */
109: #define ARPHRD_FRAD     770             /* Frame Relay Access Device.  */
110: #define ARPHRD_SKIP     771             /* SKIP vif.  */
111: #define ARPHRD_LOOPBACK 772             /* Loopback device.  */
112: #define ARPHRD_LOCALTLK 773             /* Localtalk device.  */
113: #define ARPHRD_FDDI     774             /* Fiber Distributed Data Interface. */
114: #define ARPHRD_BIF      775             /* AP1000 BIF.  */
115: #define ARPHRD_SIT      776             /* sit0 device - IPv6-in-IPv4.  */
116: #define ARPHRD_IPDDP    777             /* IP-in-DDP tunnel.  */
117: #define ARPHRD_IPGRE    778             /* GRE over IP.  */
118: #define ARPHRD_PIMREG   779             /* PIMSM register interface.  */
119: #define ARPHRD_HIPPI    780             /* High Performance Parallel I'face. */
120: #define ARPHRD_ASH      781             /* (Nexus Electronics) Ash.  */
121: #define ARPHRD_ECONET   782             /* Acorn Econet.  */
122: #define ARPHRD_IRDA     783             /* Linux-IrDA.  */
123: #define ARPHRD_FCPP     784             /* Point to point fibrechanel.  */
124: #define ARPHRD_FCAL     785             /* Fibrechanel arbitrated loop.  */
125: #define ARPHRD_FCPL     786             /* Fibrechanel public loop.  */
126: #define ARPHRD_FCFABRIC 787             /* Fibrechanel fabric.  */
127: #define ARPHRD_IEEE802_TR 800           /* Magic type ident for TR.  */
128: #define ARPHRD_IEEE80211 801            /* IEEE 802.11.  */
129: #define ARPHRD_IEEE80211_PRISM 802      /* IEEE 802.11 + Prism2 header.  */
130: #define ARPHRD_IEEE80211_RADIOTAP 803   /* IEEE 802.11 + radiotap header.  */
131: #define ARPHRD_IEEE802154 804           /* IEEE 802.15.4 header.  */
132: #define ARPHRD_IEEE802154_PHY 805       /* IEEE 802.15.4 PHY header.  */
133: 
134: #define ARPHRD_VOID       0xFFFF        /* Void type, nothing is known.  */
135: #define ARPHRD_NONE       0xFFFE        /* Zero header length.  */
136: 
137: 
138: /* ARP ioctl request.  */
139: struct arpreq
140:   {
141:     struct sockaddr arp_pa;             /* Protocol address.  */
142:     struct sockaddr arp_ha;             /* Hardware address.  */
143:     int arp_flags;                      /* Flags.  */
144:     struct sockaddr arp_netmask;        /* Netmask (only for proxy arps).  */
145:     char arp_dev[16];
146:   };
147: 
148: struct arpreq_old
149:   {
150:     struct sockaddr arp_pa;             /* Protocol address.  */
151:     struct sockaddr arp_ha;             /* Hardware address.  */
152:     int arp_flags;                      /* Flags.  */
153:     struct sockaddr arp_netmask;        /* Netmask (only for proxy arps).  */
154:   };
155: 
156: /* ARP Flag values.  */
157: #define ATF_COM         0x02            /* Completed entry (ha valid).  */
158: #define ATF_PERM        0x04            /* Permanent entry.  */
159: #define ATF_PUBL        0x08            /* Publish entry.  */
160: #define ATF_USETRAILERS 0x10            /* Has requested trailers.  */
161: #define ATF_NETMASK     0x20            /* Want to use a netmask (only
162:                                            for proxy entries).  */
163: #define ATF_DONTPUB     0x40            /* Don't answer this addresses.  */
164: #define ATF_MAGIC       0x80            /* Automatically added entry.  */
165: 
166: 
167: /* Support for the user space arp daemon, arpd.  */
168: #define ARPD_UPDATE     0x01
169: #define ARPD_LOOKUP     0x02
170: #define ARPD_FLUSH      0x03
171: 
172: struct arpd_request
173:   {
174:     unsigned short int req;             /* Request type.  */
175:     u_int32_t ip;                       /* IP address of entry.  */
176:     unsigned long int dev;              /* Device entry is tied to.  */
177:     unsigned long int stamp;
178:     unsigned long int updated;
179:     unsigned char ha[MAX_ADDR_LEN];     /* Hardware address.  */
180:   };
181: 
182: __END_DECLS
183: 
184: #endif  /* net/if_arp.h */
185: 

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