ndhc/src/arp.h

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/* arp.h - functions to call the interface change daemon
*
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* Copyright (c) 2010-2015 Nicholas J. Kain <njkain at gmail dot com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* - 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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_
#include <stdbool.h>
#include <stdint.h>
#include <net/if_arp.h>
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#include "ndhc.h"
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#include "dhcp.h"
struct arpMsg {
// Ethernet header
uint8_t h_dest[6]; // 00 destination ether addr
uint8_t h_source[6]; // 06 source ether addr
uint16_t h_proto; // 0c packet type ID field
// ARP packet
uint16_t htype; // 0e hardware type (must be ARPHRD_ETHER)
uint16_t ptype; // 10 protocol type (must be ETH_P_IP)
uint8_t hlen; // 12 hardware address length (must be 6)
uint8_t plen; // 13 protocol address length (must be 4)
uint16_t operation; // 14 ARP opcode
uint8_t smac[6]; // 16 sender's hardware address
uint8_t sip4[4]; // 1c sender's IP address
uint8_t dmac[6]; // 20 target's hardware address
uint8_t dip4[4]; // 26 target's IP address
uint8_t pad[18]; // 2a pad for min. ethernet payload (60 bytes)
};
extern int arp_probe_wait;
extern int arp_probe_num;
extern int arp_probe_min;
extern int arp_probe_max;
void set_arp_relentless_def(bool v);
void arp_reset_send_stats(void);
void arp_close_fd(struct client_state_t cs[static 1]);
int arp_check(struct client_state_t cs[static 1],
struct dhcpmsg packet[static 1]);
int arp_gw_check(struct client_state_t cs[static 1]);
void arp_set_defense_mode(struct client_state_t cs[static 1]);
void arp_success(struct client_state_t cs[static 1]);
void handle_arp_response(struct client_state_t cs[static 1]);
void handle_arp_timeout(struct client_state_t cs[static 1], long long nowts);
long long arp_get_wake_ts(void);
#endif /* ARP_H_ */