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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 Routing Header described in RFC2460
*/
#include <stdio.h>
#include <stdint.h>
#include <netinet/in.h> /* for ntohs() and "struct in6_addr" */
#include <arpa/inet.h> /* for inet_ntop() */
#include "proto.h"
#include "dissector_eth.h"
#include "built_in.h"
#include "pkt_buff.h"
#define ROUTING_HEADER_TYPE_0 0x00
struct routinghdr {
uint8_t h_next_header;
uint8_t h_hdr_ext_len;
uint8_t h_routing_type;
uint8_t h_segments_left;
} __packed;
struct routinghdr_0 {
uint32_t reserved;
uint32_t addresses[0];
} __packed;
static void dissect_routinghdr_type_0(struct pkt_buff *pkt,
ssize_t *data_len, int less)
{
uint8_t num_addr;
char address[INET6_ADDRSTRLEN];
struct in6_addr *addr;
struct routinghdr_0 *routing_0;
routing_0 = (struct routinghdr_0 *) pkt_pull(pkt, sizeof(*routing_0));
*data_len -= sizeof(*routing_0);
if (routing_0 == NULL || *data_len > pkt_len(pkt) || *data_len < 0)
return;
if (less) {
tprintf("Addresses (%zu)", *data_len / sizeof(struct in6_addr));
return;
}
tprintf("Res (0x%x)", routing_0->reserved);
num_addr = *data_len / sizeof(*addr);
while (num_addr--) {
addr = (struct in6_addr *) pkt_pull(pkt, sizeof(*addr));
*data_len -= sizeof(*addr);
if (addr == NULL || *data_len > pkt_len(pkt) || *data_len < 0)
return;
tprintf("\n\t Address: %s",
inet_ntop(AF_INET6, addr, address,
sizeof(address)));
}
}
static inline void dissect_routinghdr_type_0_norm(struct pkt_buff *pkt,
ssize_t *data_len)
{
dissect_routinghdr_type_0(pkt, data_len, 0);
}
static inline void dissect_routinghdr_type_0_less(struct pkt_buff *pkt,
ssize_t *data_len)
{
dissect_routinghdr_type_0(pkt, data_len, 1);
}
static void routing(struct pkt_buff *pkt)
{
uint16_t hdr_ext_len;
ssize_t data_len;
struct routinghdr *routing;
routing = (struct routinghdr *) pkt_pull(pkt, sizeof(*routing));
if (routing == NULL)
return;
/* Total Header Length in Bytes */
hdr_ext_len = (routing->h_hdr_ext_len + 1) * 8;
/* Data length in Bytes */
data_len = hdr_ext_len - sizeof(*routing);
tprintf("\t [ Routing ");
tprintf("NextHdr (%u), ", routing->h_next_header);
if (data_len > pkt_len(pkt) || data_len < 0){
tprintf("HdrExtLen (%u, %u Bytes %s), ", routing->h_hdr_ext_len,
hdr_ext_len, colorize_start_full(black, red)
"invalid" colorize_end());
return;
}
tprintf("HdrExtLen (%u, %u Bytes), ", routing->h_hdr_ext_len,
hdr_ext_len);
tprintf("Type (%u), ", routing->h_routing_type);
tprintf("Left (%u), ", routing->h_segments_left);
switch (routing->h_routing_type) {
case ROUTING_HEADER_TYPE_0:
dissect_routinghdr_type_0_norm(pkt, &data_len);
break;
default:
tprintf("Type %u is unknown", routing->h_routing_type);
}
tprintf(" ]\n");
if (data_len > pkt_len(pkt) || data_len < 0)
return;
pkt_pull(pkt, data_len);
pkt_set_dissector(pkt, ð_lay3, routing->h_next_header);
}
static void routing_less(struct pkt_buff *pkt)
{
uint16_t hdr_ext_len;
ssize_t data_len;
struct routinghdr *routing;
routing = (struct routinghdr *) pkt_pull(pkt, sizeof(*routing));
if (routing == NULL)
return;
/* Total Header Length in Bytes */
hdr_ext_len = (routing->h_hdr_ext_len + 1) * 8;
/* Data length in Bytes */
data_len = hdr_ext_len - sizeof(*routing);
if (data_len > pkt_len(pkt) || data_len < 0)
return;
tprintf(" Routing ");
switch (routing->h_routing_type) {
case ROUTING_HEADER_TYPE_0:
dissect_routinghdr_type_0_less(pkt, &data_len);
break;
default:
tprintf("Type %u is unknown", routing->h_routing_type);
}
if (data_len > pkt_len(pkt) || data_len < 0)
return;
pkt_pull(pkt, data_len);
pkt_set_dissector(pkt, ð_lay3, routing->h_next_header);
}
struct protocol ipv6_routing_ops = {
.key = 0x2B,
.print_full = routing,
.print_less = routing_less,
};
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