200 lines
6.8 KiB
C
200 lines
6.8 KiB
C
#include "capwap.h"
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#include "capwap_array.h"
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#include "capwap_element.h"
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/********************************************************************
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Stations | Limit |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Active WTPs | Max WTPs |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Security | R-MAC Field | Reserved1 | DTLS Policy |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| AC Information Sub-Element...
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| AC Information Vendor Identifier |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| AC Information Type | AC Information Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| AC Information Data...
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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Type: 1 for AC Descriptor
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Length: >= 12
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********************************************************************/
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struct capwap_acdescriptor_raw_element {
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unsigned short stations;
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unsigned short limit;
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unsigned short activewtp;
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unsigned short maxwtp;
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unsigned char security;
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unsigned char rmacfield;
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unsigned char reserved;
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unsigned char dtlspolicy;
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char data[0];
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} __attribute__((__packed__));
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struct capwap_acdescriptor_raw_desc_subelement {
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unsigned long vendor;
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unsigned short type;
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unsigned short length;
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char data[0];
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} __attribute__((__packed__));
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/* */
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struct capwap_message_element* capwap_acdescriptor_element_create(void* data, unsigned long datalength) {
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char* pos;
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unsigned long i;
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unsigned short length;
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struct capwap_message_element* element;
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struct capwap_acdescriptor_raw_element* dataraw;
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struct capwap_acdescriptor_element* dataelement = (struct capwap_acdescriptor_element*)data;
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ASSERT(data != NULL);
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ASSERT(datalength >= sizeof(struct capwap_acdescriptor_element));
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ASSERT(dataelement->descsubelement != NULL);
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/* Calc length packet */
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length = sizeof(struct capwap_acdescriptor_raw_element);
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for (i = 0; i < dataelement->descsubelement->count; i++) {
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struct capwap_acdescriptor_desc_subelement* desc = (struct capwap_acdescriptor_desc_subelement*)capwap_array_get_item_pointer(dataelement->descsubelement, i);
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length += sizeof(struct capwap_acdescriptor_raw_desc_subelement) + desc->length;
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}
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/* Alloc block of memory */
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element = capwap_alloc(sizeof(struct capwap_message_element) + length);
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if (!element) {
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capwap_outofmemory();
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}
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/* Create message element */
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memset(element, 0, sizeof(struct capwap_message_element) + length);
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element->type = htons(CAPWAP_ELEMENT_ACDESCRIPTION);
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element->length = htons(length);
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/* Descriptor */
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dataraw = (struct capwap_acdescriptor_raw_element*)element->data;
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dataraw->stations = htons(dataelement->station);
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dataraw->limit = htons(dataelement->stationlimit);
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dataraw->activewtp = htons(dataelement->wtp);
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dataraw->maxwtp = htons(dataelement->wtplimit);
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dataraw->security = dataelement->security;
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dataraw->rmacfield = dataelement->rmacfield;
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dataraw->dtlspolicy = dataelement->dtlspolicy;
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/* Descriptor Sub-Element */
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pos = dataraw->data;
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for (i = 0; i < dataelement->descsubelement->count; i++) {
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struct capwap_acdescriptor_raw_desc_subelement* descraw = (struct capwap_acdescriptor_raw_desc_subelement*)pos;
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struct capwap_acdescriptor_desc_subelement* desc = (struct capwap_acdescriptor_desc_subelement*)capwap_array_get_item_pointer(dataelement->descsubelement, i);
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descraw->vendor = htonl(desc->vendor);
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descraw->type = htons(desc->type);
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descraw->length = htons(desc->length);
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memcpy(descraw->data, desc->data, desc->length);
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pos += sizeof(struct capwap_acdescriptor_raw_desc_subelement) + desc->length;
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}
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return element;
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}
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/* */
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int capwap_acdescriptor_element_validate(struct capwap_message_element* element) {
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/* TODO */
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return 1;
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}
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/* */
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void* capwap_acdescriptor_element_parsing(struct capwap_message_element* element) {
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unsigned char i;
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long length;
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char* pos;
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struct capwap_acdescriptor_element* data;
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struct capwap_acdescriptor_raw_element* dataraw;
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ASSERT(element);
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ASSERT(ntohs(element->type) == CAPWAP_ELEMENT_ACDESCRIPTION);
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length = (long)ntohs(element->length);
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if (length < 12) {
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capwap_logging_debug("Invalid AC Descriptor element");
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return NULL;
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}
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/* */
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dataraw = (struct capwap_acdescriptor_raw_element*)element->data;
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if ((dataraw->stations > dataraw->limit) || (dataraw->activewtp > dataraw->maxwtp)) {
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capwap_logging_debug("Invalid AC Descriptor element");
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return NULL;
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}
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/* */
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data = (struct capwap_acdescriptor_element*)capwap_alloc(sizeof(struct capwap_acdescriptor_element));
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if (!data) {
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capwap_outofmemory();
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}
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data->descsubelement = capwap_array_create(sizeof(struct capwap_acdescriptor_desc_subelement), 0);
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/* */
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data->station = htons(dataraw->stations);
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data->stationlimit = htons(dataraw->limit);
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data->wtp = htons(dataraw->activewtp);
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data->wtplimit = htons(dataraw->maxwtp);
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data->security = dataraw->security;
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data->rmacfield = dataraw->rmacfield;
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data->dtlspolicy = dataraw->dtlspolicy;
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pos = dataraw->data;
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length -= sizeof(struct capwap_acdescriptor_raw_element);
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/* Description Subelement */
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i = 0;
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while (length > 0) {
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struct capwap_acdescriptor_desc_subelement* desc = (struct capwap_acdescriptor_desc_subelement*)capwap_array_get_item_pointer(data->descsubelement, i);
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struct capwap_acdescriptor_raw_desc_subelement* descraw = (struct capwap_acdescriptor_raw_desc_subelement*)pos;
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unsigned short desclength = ntohs(descraw->length);
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unsigned short descrawlength = sizeof(struct capwap_acdescriptor_raw_desc_subelement) + desclength;
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if ((desclength > CAPWAP_ACDESC_SUBELEMENT_MAXDATA) || (length < descrawlength)) {
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capwap_logging_debug("Invalid AC Descriptor element");
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capwap_acdescriptor_element_free(data);
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return NULL;
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}
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/* */
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desc->vendor = ntohl(descraw->vendor);
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desc->type = ntohs(descraw->type);
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desc->length = desclength;
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memcpy(desc->data, descraw->data, desclength);
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/* */
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i++;
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pos += descrawlength;
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length -= descrawlength;
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}
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return data;
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}
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/* */
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void capwap_acdescriptor_element_free(void* data) {
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struct capwap_acdescriptor_element* dataelement = (struct capwap_acdescriptor_element*)data;
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ASSERT(dataelement != NULL);
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ASSERT(dataelement->descsubelement != NULL);
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capwap_array_free(dataelement->descsubelement);
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capwap_free(dataelement);
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}
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