freewtp/lib/element_mtudiscovery.c
2016-08-23 08:55:15 +02:00

77 lines
1.9 KiB
C

#include "capwap.h"
#include "element.h"
/********************************************************************
0
0 1 2 3 4 5 6 7
+-+-+-+-+-+-+-+-+
| Padding...
+-+-+-+-+-+-+-+-
Type: 52 for MTU Discovery Padding
Length: variable
********************************************************************/
/* */
static void capwap_mtudiscovery_element_create(void* data, capwap_message_elements_handle handle, struct capwap_write_message_elements_ops* func) {
uint16_t length;
struct capwap_mtudiscovery_element* element = (struct capwap_mtudiscovery_element*)data;
ASSERT(data != NULL);
/* */
length = element->length;
while (length > 0) {
func->write_u8(handle, 0xff);
length--;
}
}
/* */
static void* capwap_mtudiscovery_element_parsing(capwap_message_elements_handle handle, struct capwap_read_message_elements_ops* func) {
uint16_t length;
struct capwap_mtudiscovery_element* data;
ASSERT(handle != NULL);
ASSERT(func != NULL);
length = func->read_ready(handle);
if (length > 0) {
log_printf(LOG_DEBUG, "Invalid MTU Discovery Padding element: underbuffer");
return NULL;
}
/* Retrieve data */
data = (struct capwap_mtudiscovery_element*)capwap_alloc(sizeof(struct capwap_mtudiscovery_element));
data->length = length;
func->read_block(handle, NULL, length);
return data;
}
/* */
static void* capwap_mtudiscovery_element_clone(void* data) {
ASSERT(data != NULL);
return capwap_clone(data, sizeof(struct capwap_mtudiscovery_element));
}
/* */
static void capwap_mtudiscovery_element_free(void* data) {
ASSERT(data != NULL);
capwap_free(data);
}
/* */
const struct capwap_message_elements_ops capwap_element_mtudiscovery_ops = {
.category = CAPWAP_MESSAGE_ELEMENT_SINGLE,
.create = capwap_mtudiscovery_element_create,
.parse = capwap_mtudiscovery_element_parsing,
.clone = capwap_mtudiscovery_element_clone,
.free = capwap_mtudiscovery_element_free
};