freewtp/src/wtp/wtp_dfa_join.c

#include "wtp.h"
#include "capwap_dfa.h"
#include "capwap_element.h"
#include "capwap_array.h"
#include "capwap_list.h"
#include "wtp_dfa.h"

/* */
void wtp_send_join(struct timeout_control* timeout) {
	struct capwap_header_data capwapheader;
	struct capwap_packet_txmng* txmngpacket;

	ASSERT(timeout != NULL);

	/* Reset DTLS counter */
	g_wtp.dfa.rfcFailedDTLSSessionCount = 0;

	/* Update status radio */
	g_wtp.descriptor.radiosinuse = wtp_update_radio_in_use();

	/* Generate session id */
	capwap_sessionid_generate(&g_wtp.sessionid);

#ifdef DEBUG
	do {
		char sessionname[33];

		capwap_sessionid_printf(&g_wtp.sessionid, sessionname);
		capwap_logging_debug("Create WTP sessionid: %s", sessionname);
	} while (0);
#endif

	/* Build packet */
	capwap_header_init(&capwapheader, CAPWAP_RADIOID_NONE, g_wtp.binding);
	txmngpacket = capwap_packet_txmng_create_ctrl_message(&capwapheader, CAPWAP_JOIN_REQUEST, g_wtp.localseqnumber++, g_wtp.mtu);

	/* Add message element */
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_LOCATION, &g_wtp.location);
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_WTPBOARDDATA, &g_wtp.boarddata);
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_WTPDESCRIPTOR, &g_wtp.descriptor);
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_WTPNAME, &g_wtp.name);
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_SESSIONID, &g_wtp.sessionid);
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_WTPFRAMETUNNELMODE, &g_wtp.mactunnel);
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_WTPMACTYPE, &g_wtp.mactype);

	if (g_wtp.binding == CAPWAP_WIRELESS_BINDING_IEEE80211) {
		wtp_create_80211_wtpradioinformation_element(txmngpacket);
	}

	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_ECNSUPPORT, &g_wtp.ecn);

	if (g_wtp.wtpctrladdress.ss_family == AF_INET) {
		struct capwap_localipv4_element addr;

		memcpy(&addr.address, &((struct sockaddr_in*)&g_wtp.wtpctrladdress)->sin_addr, sizeof(struct in_addr));
		capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_LOCALIPV4, &addr);
	} else if (g_wtp.wtpctrladdress.ss_family == AF_INET6) {
		struct capwap_localipv6_element addr;

		memcpy(&addr.address, &((struct sockaddr_in6*)&g_wtp.wtpctrladdress)->sin6_addr, sizeof(struct in6_addr));
		capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_LOCALIPV6, &addr);
	}

	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_TRANSPORT, &g_wtp.transport);
	/* CAPWAP_ELEMENT_MAXIMUMLENGTH */					/* TODO */
	capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_WTPREBOOTSTAT, &g_wtp.rebootstat);
	/* CAPWAP_ELEMENT_VENDORPAYLOAD */					/* TODO */

	/* Join request complete, get fragment packets */
	wtp_free_reference_last_request();
	capwap_packet_txmng_get_fragment_packets(txmngpacket, g_wtp.requestfragmentpacket, g_wtp.fragmentid);
	if (g_wtp.requestfragmentpacket->count > 1) {
		g_wtp.fragmentid++;
	}

	/* Free packets manager */
	capwap_packet_txmng_free(txmngpacket);

	/* Send join request to AC */
	if (capwap_crypt_sendto_fragmentpacket(&g_wtp.ctrldtls, g_wtp.acctrlsock.socket[g_wtp.acctrlsock.type], g_wtp.requestfragmentpacket, &g_wtp.wtpctrladdress, &g_wtp.acctrladdress)) {
		g_wtp.dfa.rfcRetransmitCount = 0;
		capwap_set_timeout(g_wtp.dfa.rfcRetransmitInterval, timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
		wtp_dfa_change_state(CAPWAP_JOIN_STATE);
	} else {
		/* Error to send packets */
		capwap_logging_debug("Warning: error to send join request packet");
		wtp_free_reference_last_request();
		wtp_teardown_connection(timeout);
	}
}

/* */
void wtp_dfa_state_join(struct capwap_parsed_packet* packet, struct timeout_control* timeout) {
	unsigned short binding;
	struct capwap_acdescriptor_element* acdescriptor;
	struct capwap_acname_element* acname;
	struct capwap_resultcode_element* resultcode;

	ASSERT(timeout != NULL);

	if (packet) {
		binding = GET_WBID_HEADER(packet->rxmngpacket->header);
		if (packet->rxmngpacket->isctrlpacket && (binding == g_wtp.binding) && (packet->rxmngpacket->ctrlmsg.type == CAPWAP_JOIN_RESPONSE) && ((g_wtp.localseqnumber - 1) == packet->rxmngpacket->ctrlmsg.seq)) {
			/* Valid packet, free request packet */
			wtp_free_reference_last_request();

			/* Check the success of the Request */
			resultcode = (struct capwap_resultcode_element*)capwap_get_message_element_data(packet, CAPWAP_ELEMENT_RESULTCODE);
			if (resultcode && !CAPWAP_RESULTCODE_OK(resultcode->code)) {
				capwap_logging_warning("Receive Join Response with error: %d", (int)resultcode->code);
				wtp_teardown_connection(timeout);
			} else {
				/* TODO: gestione richiesta CAPWAP_IMAGE_DATA_STATE <-> CAPWAP_CONFIGURE_STATE */

				/* Check DTLS data policy */
				acdescriptor = (struct capwap_acdescriptor_element*)capwap_get_message_element_data(packet, CAPWAP_ELEMENT_ACDESCRIPTION);
				if (g_wtp.validdtlsdatapolicy & acdescriptor->dtlspolicy) {
					/* AC name associated */
					acname = (struct capwap_acname_element*)capwap_get_message_element_data(packet, CAPWAP_ELEMENT_ACNAME);
					g_wtp.acname.name = (uint8_t*)capwap_duplicate_string((const char*)acname->name);

					/* DTLS data policy */
					g_wtp.dtlsdatapolicy = acdescriptor->dtlspolicy & g_wtp.validdtlsdatapolicy;

					/* Binding values */
					if (!wtp_radio_setconfiguration(packet)) {
						wtp_send_configure(timeout);		/* Send configuration packet */
					} else {
						capwap_logging_warning("Receive Join Response with invalid elements");
						wtp_teardown_connection(timeout);
					}
				} else {
					capwap_logging_warning("Receive Join Response with invalid DTLS data policy");
					wtp_teardown_connection(timeout);
				}
			}
		}
	} else {
		/* No Join response received */
		g_wtp.dfa.rfcRetransmitCount++;
		if (g_wtp.dfa.rfcRetransmitCount >= g_wtp.dfa.rfcMaxRetransmit) {
			/* Timeout join state */
			wtp_free_reference_last_request();
			wtp_teardown_connection(timeout);
		} else {
			/* Retransmit join request */
			if (!capwap_crypt_sendto_fragmentpacket(&g_wtp.ctrldtls, g_wtp.acctrlsock.socket[g_wtp.acctrlsock.type], g_wtp.requestfragmentpacket, &g_wtp.wtpctrladdress, &g_wtp.acctrladdress)) {
				capwap_logging_debug("Warning: error to send join request packet");
			}

			/* Update timeout */
			capwap_set_timeout(g_wtp.dfa.rfcRetransmitInterval, timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
		}
	}
}