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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.
*
* http://tools.ietf.org/html/rfc3032
*/
#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h> /* for ntohs() */
#include <errno.h>
#include "proto.h"
#include "dissector_eth.h"
#include "built_in.h"
#include "pkt_buff.h"
struct mpls_uchdr {
uint32_t mpls_uc_hdr;
} __packed;
static int mpls_uc_next_proto(struct pkt_buff *pkt)
{
uint8_t proto;
uint16_t key = 0;
if (pkt_len(pkt))
proto = *(pkt->data);
else
return -EIO;
/* FIXME: Right now only test for IP Version field */
switch (proto >> 4) {
case 4:
key = 0x0800; /* IPv4*/
break;
case 6:
key = 0x86DD; /* IPv6*/
break;
default:
/* Nothing detected ... */
return -ENOENT;
}
return key;
}
static void mpls_uc_full(struct pkt_buff *pkt)
{
int next;
uint32_t mpls_uc_data;
struct mpls_uchdr *mpls_uc;
uint8_t s = 0;
do {
mpls_uc = (struct mpls_uchdr *) pkt_pull(pkt, sizeof(*mpls_uc));
if (mpls_uc == NULL)
return;
mpls_uc_data = ntohl(mpls_uc->mpls_uc_hdr);
s = (mpls_uc_data >> 8) & 0x1;
tprintf(" [ MPLS ");
tprintf("Label (%u), ", mpls_uc_data >> 12);
tprintf("Exp (%u), ", (mpls_uc_data >> 9) & 0x7);
tprintf("S (%u), ", s);
tprintf("TTL (%u)", (mpls_uc_data & 0xFF));
tprintf(" ]\n");
} while (!s);
next = mpls_uc_next_proto(pkt);
if (next < 0)
return;
pkt_set_dissector(pkt, ð_lay2, (uint16_t) next);
}
static void mpls_uc_less(struct pkt_buff *pkt)
{
int next;
uint32_t mpls_uc_data;
struct mpls_uchdr *mpls_uc;
uint8_t s = 0;
do {
mpls_uc = (struct mpls_uchdr *) pkt_pull(pkt, sizeof(*mpls_uc));
if (mpls_uc == NULL)
return;
mpls_uc_data = ntohl(mpls_uc->mpls_uc_hdr);
s = (mpls_uc_data >> 8) & 0x1;
tprintf(" MPLS/%u", mpls_uc_data >> 12);
} while (!s);
next = mpls_uc_next_proto(pkt);
if (next < 0)
return;
pkt_set_dissector(pkt, ð_lay2, (uint16_t) next);
}
struct protocol mpls_uc_ops = {
.key = 0x8847,
.print_full = mpls_uc_full,
.print_less = mpls_uc_less,
};
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