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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2012 Markus Amend <markus@netsniff-ng.org>, Deutsche Flugsicherung GmbH
* Subject to the GPL, version 2.
*
* IPv6 Fragmentation Header described in RFC2460
*/
#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h> /* for ntohs() */
#include "proto.h"
#include "dissector_eth.h"
#include "built_in.h"
#include "pkt_buff.h"
struct fragmhdr {
uint8_t h_fragm_next_header;
uint8_t h_fragm_reserved;
uint16_t h_fragm_off_res_M;
uint32_t h_fragm_identification;
} __packed;
static void fragm(struct pkt_buff *pkt)
{
uint16_t off_res_M;
struct fragmhdr *fragm_ops;
fragm_ops = (struct fragmhdr *) pkt_pull(pkt, sizeof(*fragm_ops));
if (fragm_ops == NULL)
return;
off_res_M = ntohs(fragm_ops->h_fragm_off_res_M);
tprintf("\t [ Fragment ");
tprintf("NextHdr (%u), ", fragm_ops->h_fragm_next_header);
tprintf("Reserved (%u), ", fragm_ops->h_fragm_reserved);
tprintf("Offset (%u), ", off_res_M >> 3);
tprintf("Res (%u), ", (off_res_M >> 1) & 0x3);
tprintf("M flag (%u), ", off_res_M & 0x1);
tprintf("Identification (%u)",
ntohl(fragm_ops->h_fragm_identification));
tprintf(" ]\n");
pkt_set_dissector(pkt, ð_lay3, fragm_ops->h_fragm_next_header);
}
static void fragm_less(struct pkt_buff *pkt)
{
uint16_t off_res_M;
struct fragmhdr *fragm_ops;
fragm_ops = (struct fragmhdr *) pkt_pull(pkt, sizeof(*fragm_ops));
if (fragm_ops == NULL)
return;
off_res_M = ntohs(fragm_ops->h_fragm_off_res_M);
tprintf(" FragmOffs %u", off_res_M >> 3);
pkt_set_dissector(pkt, ð_lay3, fragm_ops->h_fragm_next_header);
}
struct protocol ipv6_fragm_ops = {
.key = 0x2C,
.print_full = fragm,
.print_less = fragm_less,
};
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