bool probe_extract_ext(const probe_t * probe, const char * name, size_t depth, void * value) {
size_t i, num_layers = probe_get_num_layers(probe);
const layer_t * layer;
const protocol_field_t * protocol_field;
// We go through the layers until we get the required field
for(i = depth; i < num_layers; i++) {
layer = probe_get_layer(probe, i);
if (!(protocol_field = layer_get_protocol_field(layer, name))) continue;
// Hack to convert ipv*_t extracted into address_t value.
switch (protocol_field->type) {
case TYPE_IPV4:
memset(value, 0, sizeof(address_t));
((address_t *) value)->family = AF_INET;
value = &((address_t *) value)->ip.ipv4;
break;
case TYPE_IPV6:
memset(value, 0, sizeof(address_t));
((address_t *) value)->family = AF_INET6;
value = &((address_t *) value)->ip.ipv6;
break;
default: break;
}
if ((layer = probe_get_layer(probe, i))
&& layer_extract(layer, name, value)) {
return true;
}
}
return false;
}
const protocol_t * icmpv4_get_next_protocol(const layer_t * icmpv4_layer) {
const protocol_t * next_protocol = NULL;
uint8_t icmpv4_type;
if (layer_extract(icmpv4_layer, "type", &icmpv4_type)) {
switch (icmpv4_type) {
case ICMP_DEST_UNREACH:
case ICMP_TIME_EXCEEDED:
next_protocol = protocol_search("ipv4");
break;
default:
break;
}
}
return next_protocol;
}
