freewtp/lib/element_80211_txpowerlevel.c
2016-08-23 08:55:15 +02:00

97 lines
2.8 KiB
C

#include "capwap.h"
#include "element.h"
/********************************************************************
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Radio ID | Num Levels | Power Level [n] |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Type: 1042 for IEEE 802.11 Tx Power Level
Length: >= 4
********************************************************************/
/* */
static void capwap_80211_txpowerlevel_element_create(void* data, capwap_message_elements_handle handle, struct capwap_write_message_elements_ops* func) {
int i;
struct capwap_80211_txpowerlevel_element* element = (struct capwap_80211_txpowerlevel_element*)data;
ASSERT(data != NULL);
func->write_u8(handle, element->radioid);
func->write_u8(handle, element->numlevels);
for (i = 0; i < element->numlevels; i++) {
func->write_u16(handle, element->powerlevel[i]);
}
}
/* */
static void* capwap_80211_txpowerlevel_element_parsing(capwap_message_elements_handle handle, struct capwap_read_message_elements_ops* func) {
int i;
unsigned short length;
struct capwap_80211_txpowerlevel_element* data;
ASSERT(handle != NULL);
ASSERT(func != NULL);
length = func->read_ready(handle);
if (length < 4) {
log_printf(LOG_DEBUG, "Invalid IEEE 802.11 Tx Power Level element");
return NULL;
}
length -= 2;
if ((length % sizeof(uint16_t)) || ((length / sizeof(uint16_t)) > CAPWAP_TXPOWERLEVEL_MAXLENGTH)) {
log_printf(LOG_DEBUG, "Invalid IEEE 802.11 Tx Power Level element");
return NULL;
}
/* */
data = (struct capwap_80211_txpowerlevel_element*)capwap_alloc(sizeof(struct capwap_80211_txpowerlevel_element));
memset(data, 0, sizeof(struct capwap_80211_txpowerlevel_element));
/* Retrieve data */
func->read_u8(handle, &data->radioid);
func->read_u8(handle, &data->numlevels);
/* Check */
if ((data->numlevels * sizeof(uint16_t)) != length) {
log_printf(LOG_DEBUG, "Invalid IEEE 802.11 Tx Power Level element");
capwap_free(data);
return NULL;
}
for (i = 0; i < data->numlevels; i++) {
func->read_u16(handle, &data->powerlevel[i]);
}
return data;
}
/* */
static void* capwap_80211_txpowerlevel_element_clone(void* data) {
ASSERT(data != NULL);
return capwap_clone(data, sizeof(struct capwap_80211_txpowerlevel_element));
}
/* */
static void capwap_80211_txpowerlevel_element_free(void* data) {
ASSERT(data != NULL);
capwap_free(data);
}
/* */
const struct capwap_message_elements_ops capwap_element_80211_txpowerlevel_ops = {
.category = CAPWAP_MESSAGE_ELEMENT_ARRAY,
.create = capwap_80211_txpowerlevel_element_create,
.parse = capwap_80211_txpowerlevel_element_parsing,
.clone = capwap_80211_txpowerlevel_element_clone,
.free = capwap_80211_txpowerlevel_element_free
};