freewtp/src/dfa_join.c

#include "wtp.h"
#include "capwap_dfa.h"
#include "element.h"
#include "array.h"
#include "list.h"
#include "dfa.h"
#include "radio.h"

/* */
void wtp_dfa_state_join_enter(void)
{
	struct capwap_header_data capwapheader;
	struct capwap_packet_txmng* txmngpacket;

	/* Reset DTLS counter */
	g_wtp.faileddtlssessioncount = 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);
		log_printf(LOG_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);
		wtp_create_80211_encryption_capability_elements(txmngpacket);
		wtp_create_80211_supported_mac_profiles_elements(txmngpacket);
	}

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

	if (g_wtp.dtls.localaddr.ss.ss_family == AF_INET) {
		struct capwap_localipv4_element addr;

		memcpy(&addr.address, &g_wtp.dtls.localaddr.sin.sin_addr, sizeof(struct in_addr));
		capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_LOCALIPV4, &addr);
	} else if (g_wtp.dtls.localaddr.ss.ss_family == AF_INET6) {
		struct capwap_localipv6_element addr;

		memcpy(&addr.address, &g_wtp.dtls.localaddr.sin6.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.dtls, g_wtp.requestfragmentpacket)) {
		/* Error to send packets */
		log_printf(LOG_DEBUG, "Warning: error to send join request packet");
		wtp_free_reference_last_request();
		wtp_teardown_connection();

		return;
	}

	g_wtp.retransmitcount = 0;
	wtp_dfa_start_retransmition_timer();
}

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

	if (packet->rxmngpacket->ctrlmsg.type != CAPWAP_JOIN_RESPONSE) {
		log_printf(LOG_DEBUG, "Unexpected message %d in state Join",
				     packet->rxmngpacket->ctrlmsg.type);
		return;
	}

	/* */
	binding = GET_WBID_HEADER(packet->rxmngpacket->header);
	if (binding != g_wtp.binding) {
		log_printf(LOG_DEBUG, "Join Response for invalid binding");
		return;
	}

	if (g_wtp.localseqnumber != packet->rxmngpacket->ctrlmsg.seq) {
		log_printf(LOG_DEBUG, "Join Response with invalid sequence (%d != %d)",
				     g_wtp.localseqnumber, packet->rxmngpacket->ctrlmsg.seq);
		return;
	}

	wtp_dfa_stop_retransmition_timer();

	g_wtp.localseqnumber++;

	/* 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)) {
		log_printf(LOG_WARNING, "Receive Join Response with error: %d",
				       (int)resultcode->code);
		wtp_teardown_connection();
		return;
	}

	/* 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)) {
		log_printf(LOG_WARNING, "Receive Join Response with invalid DTLS data policy");
		wtp_teardown_connection();
		return;
	}

	/* 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)) {
		log_printf(LOG_WARNING, "Receive Join Response with invalid elements");
		wtp_teardown_connection();
		return;
	}

	wtp_dfa_change_state(CAPWAP_CONFIGURE_STATE);
}