The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/if_arp.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1986, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)if_arp.h    8.1 (Berkeley) 6/10/93
   32  * $FreeBSD: head/sys/net/if_arp.h 344954 2019-03-09 01:12:59Z bz $
   33  */
   34 
   35 #ifndef _NET_IF_ARP_H_
   36 #define _NET_IF_ARP_H_
   37 
   38 /*
   39  * Address Resolution Protocol.
   40  *
   41  * See RFC 826 for protocol description.  ARP packets are variable
   42  * in size; the arphdr structure defines the fixed-length portion.
   43  * Protocol type values are the same as those for 10 Mb/s Ethernet.
   44  * It is followed by the variable-sized fields ar_sha, arp_spa,
   45  * arp_tha and arp_tpa in that order, according to the lengths
   46  * specified.  Field names used correspond to RFC 826.
   47  */
   48 struct  arphdr {
   49         u_short ar_hrd;         /* format of hardware address */
   50 #define ARPHRD_ETHER    1       /* ethernet hardware format */
   51 #define ARPHRD_IEEE802  6       /* token-ring hardware format */
   52 #define ARPHRD_FRELAY   15      /* frame relay hardware format */
   53 #define ARPHRD_IEEE1394 24      /* firewire hardware format */
   54 #define ARPHRD_INFINIBAND 32    /* infiniband hardware format */
   55         u_short ar_pro;         /* format of protocol address */
   56         u_char  ar_hln;         /* length of hardware address */
   57         u_char  ar_pln;         /* length of protocol address */
   58         u_short ar_op;          /* one of: */
   59 #define ARPOP_REQUEST   1       /* request to resolve address */
   60 #define ARPOP_REPLY     2       /* response to previous request */
   61 #define ARPOP_REVREQUEST 3      /* request protocol address given hardware */
   62 #define ARPOP_REVREPLY  4       /* response giving protocol address */
   63 #define ARPOP_INVREQUEST 8      /* request to identify peer */
   64 #define ARPOP_INVREPLY  9       /* response identifying peer */
   65 /*
   66  * The remaining fields are variable in size,
   67  * according to the sizes above.
   68  */
   69 #ifdef COMMENT_ONLY
   70         u_char  ar_sha[];       /* sender hardware address */
   71         u_char  ar_spa[];       /* sender protocol address */
   72         u_char  ar_tha[];       /* target hardware address */
   73         u_char  ar_tpa[];       /* target protocol address */
   74 #endif
   75 };
   76 
   77 #define ar_sha(ap)      (((caddr_t)((ap)+1)) +   0)
   78 #define ar_spa(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln)
   79 #define ar_tha(ap)      (((caddr_t)((ap)+1)) +   (ap)->ar_hln + (ap)->ar_pln)
   80 #define ar_tpa(ap)      (((caddr_t)((ap)+1)) + 2*(ap)->ar_hln + (ap)->ar_pln)
   81 
   82 #define arphdr_len2(ar_hln, ar_pln)                                     \
   83         (sizeof(struct arphdr) + 2*(ar_hln) + 2*(ar_pln))
   84 #define arphdr_len(ap)  (arphdr_len2((ap)->ar_hln, (ap)->ar_pln))
   85 
   86 /*
   87  * ARP ioctl request
   88  */
   89 struct arpreq {
   90         struct  sockaddr arp_pa;                /* protocol address */
   91         struct  sockaddr arp_ha;                /* hardware address */
   92         int     arp_flags;                      /* flags */
   93 };
   94 /*  arp_flags and at_flags field values */
   95 #define ATF_INUSE       0x01    /* entry in use */
   96 #define ATF_COM         0x02    /* completed entry (enaddr valid) */
   97 #define ATF_PERM        0x04    /* permanent entry */
   98 #define ATF_PUBL        0x08    /* publish entry (respond for other host) */
   99 #define ATF_USETRAILERS 0x10    /* has requested trailers */
  100 
  101 struct arpstat {
  102         /* Normal things that happen: */
  103         uint64_t txrequests;    /* # of ARP requests sent by this host. */
  104         uint64_t txreplies;     /* # of ARP replies sent by this host. */
  105         uint64_t rxrequests;    /* # of ARP requests received by this host. */
  106         uint64_t rxreplies;     /* # of ARP replies received by this host. */
  107         uint64_t received;      /* # of ARP packets received by this host. */
  108         uint64_t txerrors;      /* # of ARP requests failed to send. */
  109 
  110         uint64_t arp_spares[3]; /* For either the upper or lower half. */
  111         /* Abnormal event and error  counting: */
  112         uint64_t dropped;       /* # of packets dropped waiting for a reply. */
  113         uint64_t timeouts;      /* # of times with entries removed */
  114                                 /* due to timeout. */
  115         uint64_t dupips;        /* # of duplicate IPs detected. */
  116 };
  117 
  118 #ifdef _KERNEL
  119 #include <sys/counter.h>
  120 #include <net/vnet.h>
  121 
  122 VNET_PCPUSTAT_DECLARE(struct arpstat, arpstat);
  123 /*
  124  * In-kernel consumers can use these accessor macros directly to update
  125  * stats.
  126  */
  127 #define ARPSTAT_ADD(name, val)  \
  128     VNET_PCPUSTAT_ADD(struct arpstat, arpstat, name, (val))
  129 #define ARPSTAT_SUB(name, val)  ARPSTAT_ADD(name, -(val))
  130 #define ARPSTAT_INC(name)       ARPSTAT_ADD(name, 1)
  131 #define ARPSTAT_DEC(name)       ARPSTAT_SUB(name, 1)
  132 
  133 #endif /* _KERNEL */
  134 
  135 #endif /* !_NET_IF_ARP_H_ */

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