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57 wiersze
1.1 KiB
C
57 wiersze
1.1 KiB
C
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/* ethernet.h */
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/*
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* Routines for taking ethernet packets apart.
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*/
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#ifndef _ethernet_h
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#define _ethernet_h
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include "pcap.h"
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typedef struct ethernet_packet_s
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{
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// Source address.
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uint8_t src_addr[6];
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// Destination ddress.
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uint8_t dst_addr[6];
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// 0x5DC is the maximum frame length in 802.3
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#define ETHERNET_MAY_BE_IP(typeorlen) ((typeorlen) == 0x800 || (typeorlen) <= 0x5DC)
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#define ETHERNET_TYPE_IP 0x800
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// Type
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uint16_t typeorlen;
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// Checksum if present. Note that pcap doesn't include checksums.
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uint32_t checksum;
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} ethernet_packet_t;
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#define ETHERNET_ERR_PKT_TOO_SHORT (-1)
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/*
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* \param out_st OUT Index into data at which ethernet payload starts.
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* \param out_len OUT Length of the ethernet payload.
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* \return 0 on success, -1 on failure.
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*
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*/
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int ethernet_packet_from_pcap(pcaprec_hdr_t *hdr,
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const uint8_t *data,
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const uint32_t len,
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ethernet_packet_t *pkt,
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uint32_t *out_st,
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uint32_t *out_len);
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#endif
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/* End file */
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