61 lines
2.4 KiB
C
61 lines
2.4 KiB
C
/* arp.h - functions to call the interface change daemon
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* Time-stamp: <2011-05-31 11:11:02 njk>
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*
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* Copyright 2010-2011 Nicholas J. Kain <njkain@gmail.com>
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*
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* Originally derived from busybox's udhcpc variant, which in turn was...
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* Mostly stolen from: dhcpcd - DHCP client daemon
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* by Yoichi Hariguchi <yoichi@fore.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef ARPPING_H_
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#define ARPPING_H_
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#include <stdint.h>
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#include <net/if_arp.h>
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#include "config.h"
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#include "packet.h"
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struct arpMsg {
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/* Ethernet header */
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uint8_t h_dest[6]; /* 00 destination ether addr */
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uint8_t h_source[6]; /* 06 source ether addr */
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uint16_t h_proto; /* 0c packet type ID field */
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/* ARP packet */
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uint16_t htype; /* 0e hardware type (must be ARPHRD_ETHER) */
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uint16_t ptype; /* 10 protocol type (must be ETH_P_IP) */
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uint8_t hlen; /* 12 hardware address length (must be 6) */
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uint8_t plen; /* 13 protocol address length (must be 4) */
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uint16_t operation; /* 14 ARP opcode */
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uint8_t smac[6]; /* 16 sender's hardware address */
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uint8_t sip4[4]; /* 1c sender's IP address */
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uint8_t dmac[6]; /* 20 target's hardware address */
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uint8_t dip4[4]; /* 26 target's IP address */
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uint8_t pad[18]; /* 2a pad for min. ethernet payload (60 bytes) */
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};
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int arp_close_fd(struct client_state_t *cs);
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int arp_check(struct client_state_t *cs, struct dhcpmsg *packet);
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int arp_gw_check(struct client_state_t *cs);
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int arp_get_gw_hwaddr(struct client_state_t *cs);
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void arp_success(struct client_state_t *cs);
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void arp_gw_failed(struct client_state_t *cs);
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void handle_arp_response(struct client_state_t *cs);
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#endif /* ARPPING_H_ */
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