b5e5685d01
lease. Be more aggressive about closing old arp file descriptors. Check the ARP headers to make sure that received ARP packets are addressed to our machine. Whatever bug may have existed before doesn't exist on modern Linux kernels, if it ever did. Use the stored gateway hardware address to validate a restored link in the DS_ARP_GW_CHECK state. If an ARP message is received while we are in a state that does not expect ARP messages, close the ARP socket and log a message.
41 lines
1.4 KiB
C
41 lines
1.4 KiB
C
#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 sHaddr[6]; /* 16 sender's hardware address */
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uint8_t sInaddr[4]; /* 1c sender's IP address */
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uint8_t tHaddr[6]; /* 20 target's hardware address */
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uint8_t tInaddr[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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enum {
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ARP_MSG_SIZE = 0x2a
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};
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void arp_check(struct client_state_t *cs, struct dhcpMessage *packet);
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void arp_success(struct client_state_t *cs);
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void handle_arp_response(struct client_state_t *cs);
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void arp_gw_check(struct client_state_t *cs);
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void arp_gw_failed(struct client_state_t *cs);
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void arp_get_gw_hwaddr(struct client_state_t *cs);
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#endif /* ARPPING_H_ */
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