implement several 80211 element

src/common/capwap_element_80211_txpowerlevel.c

@@ -0,0 +1,109 @@
+#include "capwap.h"
+#include "capwap_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
+
+********************************************************************/
+
+struct capwap_80211_txpowerlevel_raw_element {
+	unsigned char radioid;
+	unsigned char numlevels;
+	unsigned short powerlevel[0];
+} __attribute__((__packed__));
+
+/* */
+struct capwap_message_element* capwap_80211_txpowerlevel_element_create(void* data, unsigned long datalength) {
+	int i;
+	unsigned short txpowerlength;
+	struct capwap_message_element* element;
+	struct capwap_80211_txpowerlevel_raw_element* dataraw;
+	struct capwap_80211_txpowerlevel_element* dataelement = (struct capwap_80211_txpowerlevel_element*)data;
+
+	ASSERT(data != NULL);
+	ASSERT(datalength >= sizeof(struct capwap_80211_txpowerlevel_element));
+
+	/* Alloc block of memory */
+	txpowerlength = dataelement->numlevels * sizeof(unsigned char);
+	element = capwap_alloc(sizeof(struct capwap_message_element) + sizeof(struct capwap_80211_txpowerlevel_raw_element) + txpowerlength);
+	if (!element) {
+		capwap_outofmemory();
+	}
+
+	/* Create message element */
+	memset(element, 0, sizeof(struct capwap_message_element) + sizeof(struct capwap_80211_txpowerlevel_raw_element) + txpowerlength);
+	element->type = htons(CAPWAP_ELEMENT_80211_TXPOWERLEVEL);
+	element->length = htons(sizeof(struct capwap_80211_txpowerlevel_raw_element) + txpowerlength);
+	dataraw = (struct capwap_80211_txpowerlevel_raw_element*)element->data;
+
+	dataraw->radioid = dataelement->radioid;
+	dataraw->numlevels = dataelement->numlevels;
+	for (i = 0; i < dataelement->numlevels; i++) {
+		dataraw->powerlevel[i] = htons(dataelement->powerlevel[i]);
+	}
+
+	return element;
+}
+
+/* */
+int capwap_80211_txpowerlevel_element_validate(struct capwap_message_element* element) {
+	/* TODO */
+	return 1;
+}
+
+/* */
+void* capwap_80211_txpowerlevel_element_parsing(struct capwap_message_element* element) {
+	int i;
+	unsigned short txpowerlength;
+	struct capwap_80211_txpowerlevel_element* data;
+	struct capwap_80211_txpowerlevel_raw_element* dataraw;
+	
+	ASSERT(element);
+	ASSERT(ntohs(element->type) == CAPWAP_ELEMENT_80211_TXPOWERLEVEL);
+
+	txpowerlength = ntohs(element->length);
+	if (txpowerlength < 4) {
+		return NULL;
+	}
+
+	txpowerlength -= sizeof(struct capwap_80211_txpowerlevel_raw_element);
+	if (txpowerlength > (CAPWAP_TXPOWERLEVEL_MAXLENGTH * sizeof(unsigned short))) {
+		return NULL;
+	}
+
+	dataraw = (struct capwap_80211_txpowerlevel_raw_element*)element->data;
+	if ((dataraw->numlevels < 1) || (dataraw->numlevels > CAPWAP_TXPOWERLEVEL_MAXLENGTH)) {
+		return NULL;
+	}
+
+	/* */
+	data = (struct capwap_80211_txpowerlevel_element*)capwap_alloc(sizeof(struct capwap_80211_txpowerlevel_element));
+	if (!data) {
+		capwap_outofmemory();
+	}
+
+	/* */
+	data->radioid = dataraw->radioid;
+	data->numlevels = dataraw->numlevels;
+	for (i = 0; i < dataraw->numlevels; i++) {
+		data->powerlevel[i] = dataraw->powerlevel[i];
+	}
+
+	return data;
+}
+
+/* */
+void capwap_80211_txpowerlevel_element_free(void* data) {
+	ASSERT(data != NULL);
+
+	capwap_free(data);
+}