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/*
* netsniff-ng - the packet sniffing beast
* Copyright 2009, 2010 Daniel Borkmann.
* Copyright 2010 Emmanuel Roullit.
* Subject to the GPL, version 2.
*/
#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h> /* for ntohs() */
#include "proto.h"
#include "dissector_eth.h"
#include "pkt_buff.h"
struct vlanhdr {
uint16_t h_vlan_TCI;
uint16_t h_vlan_encapsulated_proto;
} __packed;
static void vlan(struct pkt_buff *pkt)
{
uint16_t tci;
struct vlanhdr *vlan = (struct vlanhdr *) pkt_pull(pkt, sizeof(*vlan));
if (vlan == NULL)
return;
tci = ntohs(vlan->h_vlan_TCI);
tprintf(" [ VLAN ");
tprintf("Prio (%d), ", (tci & 0xE000) >> 13);
tprintf("CFI (%d), ", (tci & 0x1000) >> 12);
tprintf("ID (%d), ", (tci & 0x0FFF));
tprintf("Proto (0x%.4x)", ntohs(vlan->h_vlan_encapsulated_proto));
tprintf(" ]\n");
pkt_set_proto(pkt, ð_lay2, ntohs(vlan->h_vlan_encapsulated_proto));
}
static void vlan_less(struct pkt_buff *pkt)
{
uint16_t tci;
struct vlanhdr *vlan = (struct vlanhdr *) pkt_pull(pkt, sizeof(*vlan));
if (vlan == NULL)
return;
tci = ntohs(vlan->h_vlan_TCI);
tprintf(" VLAN%d", (tci & 0x0FFF));
pkt_set_proto(pkt, ð_lay2, ntohs(vlan->h_vlan_encapsulated_proto));
}
struct protocol vlan_ops = {
.key = 0x8100,
.print_full = vlan,
.print_less = vlan_less,
};
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