315cf6b135
RFC5227. Rate-limiting is also supported. Keep ARP stats per packet send type rather than per ARP state. Use the new stats to replace last_def_ts. Multiple triggers of arp_gw_check from interface-up-events in quick succession could cause the dhcpState to become corrupt. Fix by making the ARP_GW_CHECK be level triggered rather than edge triggered. Make the timeout calculations in the ARP retransmission code much more accurate. Close the ARP fd if we give up on lease defense and go back to requesting a new lease. Do a second arp_announcement() after finding the default GW's hwaddr. Clean up frenew to sanely handle the various ARP checking events. Now renew signals will be ignored during these states. It was particularly insane before if a renew signal were received during DS_COLLISION_CHECK. If the hardware link carrier goes down, do not sleep. Just keep working. Only go to sleep if the user explicitly deconfigures the interface. This change is far more sane for non-mobile hosts, and still works fine with roaming machines: the important thing is the gw hardware address checking that is triggered when the interface comes back up.
60 lines
2.2 KiB
C
60 lines
2.2 KiB
C
/* arp.h - functions to call the interface change daemon
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* Time-stamp: <2011-07-05 13:49:59 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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* 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 ARP_H_
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#define ARP_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 "dhcp.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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extern int arp_relentless_def;
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void arp_reset_send_stats(void);
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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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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 arp_retransmit(struct client_state_t *cs);
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void handle_arp_response(struct client_state_t *cs);
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#endif /* ARP_H_ */
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