external/bsd/dhcpcd/dist/arp.h

   1 /* $NetBSD: arp.h,v 1.11 2015/07/09 10:15:34 roy Exp $ */
   2
   3 /*
   4  * dhcpcd - DHCP client daemon
   5  * Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
   6  * All rights reserved
   7
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 #ifndef ARP_H
  31 #define ARP_H
  32
  33 /* ARP timings from RFC5227 */
  34 #define PROBE_WAIT               1
  35 #define PROBE_NUM                3
  36 #define PROBE_MIN                1
  37 #define PROBE_MAX                2
  38 #define ANNOUNCE_WAIT            2
  39 #define ANNOUNCE_NUM             2
  40 #define ANNOUNCE_INTERVAL        2
  41 #define MAX_CONFLICTS           10
  42 #define RATE_LIMIT_INTERVAL     60
  43 #define DEFEND_INTERVAL         10
  44
  45 #include "dhcpcd.h"
  46
  47 struct arp_msg {
  48         uint16_t op;
  49         unsigned char sha[HWADDR_LEN];
  50         struct in_addr sip;
  51         unsigned char tha[HWADDR_LEN];
  52         struct in_addr tip;
  53 };
  54
  55 struct arp_state {
  56         TAILQ_ENTRY(arp_state) next;
  57         struct interface *iface;
  58
  59         void (*probed_cb)(struct arp_state *);
  60         void (*announced_cb)(struct arp_state *);
  61         void (*conflicted_cb)(struct arp_state *, const struct arp_msg *);
  62         void (*free_cb)(struct arp_state *);
  63
  64         struct in_addr addr;
  65         int probes;
  66         int claims;
  67         struct in_addr failed;
  68 };
  69 TAILQ_HEAD(arp_statehead, arp_state);
  70
  71 struct iarp_state {
  72         int fd;
  73         struct arp_statehead arp_states;
  74 };
  75
  76 #define ARP_STATE(ifp)                                                         \
  77         ((struct iarp_state *)(ifp)->if_data[IF_DATA_ARP])
  78 #define ARP_CSTATE(ifp)                                                        \
  79         ((const struct iarp_state *)(ifp)->if_data[IF_DATA_ARP])
  80
  81 #ifdef INET
  82 void arp_report_conflicted(const struct arp_state *, const struct arp_msg *);
  83 void arp_announce(struct arp_state *);
  84 void arp_probe(struct arp_state *);
  85 struct arp_state *arp_new(struct interface *, const struct in_addr *);
  86 void arp_cancel(struct arp_state *);
  87 void arp_free(struct arp_state *);
  88 void arp_free_but(struct arp_state *);
  89 struct arp_state *arp_find(struct interface *, const struct in_addr *);
  90 void arp_close(struct interface *);
  91
  92 void arp_handleifa(int, struct interface *, const struct in_addr *, int);
  93 #else
  94 #define arp_close(a) {}
  95 #endif
  96 #endif