mirror of
https://github.com/rsmarples/dhcpcd.git
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95 lines
3.0 KiB
C
95 lines
3.0 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright (c) 2006-2015 Roy Marples <roy@marples.name>
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* All rights reserved
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef ARP_H
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#define ARP_H
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/* ARP timings from RFC5227 */
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#define PROBE_WAIT 1
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#define PROBE_NUM 3
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#define PROBE_MIN 1
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#define PROBE_MAX 2
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#define ANNOUNCE_WAIT 2
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#define ANNOUNCE_NUM 2
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#define ANNOUNCE_INTERVAL 2
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#define MAX_CONFLICTS 10
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#define RATE_LIMIT_INTERVAL 60
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#define DEFEND_INTERVAL 10
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#include "dhcpcd.h"
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struct arp_msg {
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uint16_t op;
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unsigned char sha[HWADDR_LEN];
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struct in_addr sip;
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unsigned char tha[HWADDR_LEN];
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struct in_addr tip;
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};
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struct arp_state {
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TAILQ_ENTRY(arp_state) next;
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struct interface *iface;
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void (*probed_cb)(struct arp_state *);
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void (*announced_cb)(struct arp_state *);
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void (*conflicted_cb)(struct arp_state *, const struct arp_msg *);
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void (*free_cb)(struct arp_state *);
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struct in_addr addr;
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int probes;
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int claims;
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struct in_addr failed;
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};
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TAILQ_HEAD(arp_statehead, arp_state);
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struct iarp_state {
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int fd;
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struct arp_statehead arp_states;
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};
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#define ARP_STATE(ifp) \
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((struct iarp_state *)(ifp)->if_data[IF_DATA_ARP])
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#define ARP_CSTATE(ifp) \
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((const struct iarp_state *)(ifp)->if_data[IF_DATA_ARP])
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#ifdef INET
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void arp_report_conflicted(const struct arp_state *, const struct arp_msg *);
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void arp_announce(struct arp_state *);
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void arp_probe(struct arp_state *);
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struct arp_state *arp_new(struct interface *, const struct in_addr *);
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void arp_cancel(struct arp_state *);
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void arp_free(struct arp_state *);
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void arp_free_but(struct arp_state *);
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struct arp_state *arp_find(struct interface *, const struct in_addr *);
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void arp_close(struct interface *);
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void arp_handleifa(int, struct interface *, const struct in_addr *, int);
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#else
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#define arp_close(a) {}
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#endif
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#endif
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