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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2021 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef ARP_H
#define ARP_H
/* ARP timings from RFC5227 */
#define PROBE_WAIT 1
#define PROBE_NUM 3
#define PROBE_MIN 1
#define PROBE_MAX 2
#define ANNOUNCE_WAIT 2
#define ANNOUNCE_NUM 2
#define ANNOUNCE_INTERVAL 2
#define MAX_CONFLICTS 10
#define RATE_LIMIT_INTERVAL 60
#define DEFEND_INTERVAL 10
#include "bpf.h"
#include "dhcpcd.h"
#include "if.h"
#ifdef IN_IFF_DUPLICATED
/* NetBSD gained RFC 5227 support in the kernel.
* This means dhcpcd doesn't need ARP except for ARPing support
* and ARP announcing an address. */
#if defined(__NetBSD_Version__) && __NetBSD_Version__ >= 799003900
#define KERNEL_RFC5227
#endif
#endif
struct arp_msg {
uint16_t op;
uint8_t sha[HWADDR_LEN];
struct in_addr sip;
uint8_t tha[HWADDR_LEN];
struct in_addr tip;
/* Frame header and sender to diagnose failures */
uint8_t fsha[HWADDR_LEN];
uint8_t ftha[HWADDR_LEN];
};
struct arp_state {
TAILQ_ENTRY(arp_state) next;
struct interface *iface;
struct in_addr addr;
struct bpf *bpf;
int probes;
int claims;
struct timespec defend;
void (*found_cb)(struct arp_state *, const struct arp_msg *);
void (*not_found_cb)(struct arp_state *);
void (*announced_cb)(struct arp_state *);
void (*defend_failed_cb)(struct arp_state *);
void (*free_cb)(struct arp_state *);
};
TAILQ_HEAD(arp_statehead, arp_state);
struct iarp_state {
struct arp_statehead arp_states;
};
#define ARP_STATE(ifp) \
((struct iarp_state *)(ifp)->if_data[IF_DATA_ARP])
#define ARP_CSTATE(ifp) \
((const struct iarp_state *)(ifp)->if_data[IF_DATA_ARP])
#ifdef ARP
void arp_packet(struct interface *, uint8_t *, size_t, unsigned int);
struct arp_state *arp_new(struct interface *, const struct in_addr *);
void arp_probe(struct arp_state *);
struct arp_state *arp_announceaddr(struct dhcpcd_ctx *, const struct in_addr *);
struct arp_state *arp_ifannounceaddr(struct interface *, const struct in_addr *);
struct arp_state * arp_find(struct interface *, const struct in_addr *);
void arp_free(struct arp_state *);
void arp_freeaddr(struct interface *, const struct in_addr *);
void arp_drop(struct interface *);
#endif /* ARP */
#endif /* ARP_H */
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