211 lines
7.4 KiB
C
211 lines
7.4 KiB
C
#include "ac.h"
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#include "capwap_dfa.h"
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#include "capwap_array.h"
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#include "ac_session.h"
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/* */
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static int receive_echo_request(struct ac_session_t* session, struct capwap_parsed_packet* packet) {
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struct capwap_header_data capwapheader;
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struct capwap_packet_txmng* txmngpacket;
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ASSERT(session != NULL);
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ASSERT(packet != NULL);
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/* Create response */
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capwap_header_init(&capwapheader, CAPWAP_RADIOID_NONE, GET_WBID_HEADER(packet->rxmngpacket->header));
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txmngpacket = capwap_packet_txmng_create_ctrl_message(&capwapheader, CAPWAP_ECHO_RESPONSE, packet->rxmngpacket->ctrlmsg.seq, session->mtu);
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/* Add message element */
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/* CAPWAP_ELEMENT_VENDORPAYLOAD */ /* TODO */
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/* Echo response complete, get fragment packets */
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ac_free_reference_last_response(session);
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capwap_packet_txmng_get_fragment_packets(txmngpacket, session->responsefragmentpacket, session->fragmentid);
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if (session->responsefragmentpacket->count > 1) {
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session->fragmentid++;
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}
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/* Free packets manager */
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capwap_packet_txmng_free(txmngpacket);
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/* Save remote sequence number */
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session->remoteseqnumber = packet->rxmngpacket->ctrlmsg.seq;
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capwap_get_packet_digest(packet->rxmngpacket, packet->connection, session->lastrecvpackethash);
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/* Send Configure response to WTP */
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if (!capwap_crypt_sendto_fragmentpacket(&session->ctrldtls, session->ctrlsocket.socket[session->ctrlsocket.type], session->responsefragmentpacket, &session->acctrladdress, &session->wtpctrladdress)) {
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/* Response is already created and saved. When receive a re-request, DFA autoresponse */
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capwap_logging_debug("Warning: error to send echo response packet");
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}
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return 0;
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}
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/* */
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static int ac_send_data_keepalive(struct ac_session_t* session, struct capwap_parsed_packet* packet) {
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struct capwap_list* txfragpacket;
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struct capwap_header_data capwapheader;
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struct capwap_packet_txmng* txmngpacket;
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int result = -1;
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/* Build packet */
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capwap_header_init(&capwapheader, CAPWAP_RADIOID_NONE, GET_WBID_HEADER(packet->rxmngpacket->header));
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capwap_header_set_keepalive_flag(&capwapheader, 1);
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txmngpacket = capwap_packet_txmng_create_data_message(&capwapheader, session->mtu);
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/* Add message element */
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capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_SESSIONID, &session->sessionid);
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/* Data keepalive complete, get fragment packets into local list */
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txfragpacket = capwap_list_create();
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capwap_packet_txmng_get_fragment_packets(txmngpacket, txfragpacket, 0);
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if (txfragpacket->count == 1) {
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/* Send Data keepalive to WTP */
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if (capwap_crypt_sendto_fragmentpacket(&session->datadtls, session->datasocket.socket[session->datasocket.type], txfragpacket, &session->acdataaddress, &session->wtpdataaddress)) {
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result = 0;
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} else {
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capwap_logging_debug("Warning: error to send data channel keepalive packet");
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}
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} else {
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capwap_logging_debug("Warning: error to send data channel keepalive packet, fragment packet");
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}
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/* Free packets manager */
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capwap_list_free(txfragpacket);
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capwap_packet_txmng_free(txmngpacket);
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return result;
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}
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/* */
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int ac_dfa_state_run(struct ac_session_t* session, struct capwap_parsed_packet* packet) {
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int status = AC_DFA_ACCEPT_PACKET;
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ASSERT(session != NULL);
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if (packet) {
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if (packet->rxmngpacket->isctrlpacket) {
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if (capwap_is_request_type(packet->rxmngpacket->ctrlmsg.type) || ((session->localseqnumber - 1) == packet->rxmngpacket->ctrlmsg.seq)) {
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switch (packet->rxmngpacket->ctrlmsg.type) {
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case CAPWAP_CONFIGURATION_UPDATE_RESPONSE: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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case CAPWAP_CHANGE_STATE_EVENT_REQUEST: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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case CAPWAP_ECHO_REQUEST: {
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if (!receive_echo_request(session, packet)) {
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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} else {
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ac_dfa_change_state(session, CAPWAP_RUN_TO_DTLS_TEARDOWN_STATE);
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status = AC_DFA_NO_PACKET;
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}
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break;
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}
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case CAPWAP_CLEAR_CONFIGURATION_RESPONSE: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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case CAPWAP_WTP_EVENT_REQUEST: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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case CAPWAP_DATA_TRANSFER_REQUEST: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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case CAPWAP_DATA_TRANSFER_RESPONSE: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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case CAPWAP_STATION_CONFIGURATION_RESPONSE: {
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/* TODO */
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capwap_set_timeout(AC_MAX_ECHO_INTERVAL, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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break;
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}
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}
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}
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} else {
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if (IS_FLAG_K_HEADER(packet->rxmngpacket->header)) {
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if (!memcmp(capwap_get_message_element_data(packet, CAPWAP_ELEMENT_SESSIONID), &session->sessionid, sizeof(struct capwap_sessionid_element))) {
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if (ac_send_data_keepalive(session, packet)) {
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ac_dfa_change_state(session, CAPWAP_RUN_TO_DTLS_TEARDOWN_STATE);
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status = AC_DFA_NO_PACKET;
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}
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}
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} else {
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/* TODO */
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}
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}
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} else {
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ac_dfa_change_state(session, CAPWAP_RUN_TO_DTLS_TEARDOWN_STATE);
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status = AC_DFA_NO_PACKET;
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}
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return status;
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}
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/* */
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int ac_dfa_state_run_to_reset(struct ac_session_t* session, struct capwap_parsed_packet* packet) {
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int status = AC_DFA_NO_PACKET;
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struct capwap_header_data capwapheader;
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struct capwap_packet_txmng* txmngpacket;
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ASSERT(session != NULL);
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ASSERT(packet == NULL);
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/* Build packet */
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capwap_header_init(&capwapheader, CAPWAP_RADIOID_NONE, session->binding);
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txmngpacket = capwap_packet_txmng_create_ctrl_message(&capwapheader, CAPWAP_RESET_REQUEST, session->localseqnumber++, session->mtu);
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/* Add message element */
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capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_IMAGEIDENTIFIER, &session->startupimage);
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/* CAPWAP_ELEMENT_VENDORPAYLOAD */ /* TODO */
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/* Reset request complete, get fragment packets */
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ac_free_reference_last_request(session);
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capwap_packet_txmng_get_fragment_packets(txmngpacket, session->requestfragmentpacket, session->fragmentid);
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if (session->requestfragmentpacket->count > 1) {
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session->fragmentid++;
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}
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/* Free packets manager */
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capwap_packet_txmng_free(txmngpacket);
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/* Send Configure response to WTP */
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if (capwap_crypt_sendto_fragmentpacket(&session->ctrldtls, session->ctrlsocket.socket[session->ctrlsocket.type], session->requestfragmentpacket, &session->acctrladdress, &session->wtpctrladdress)) {
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session->dfa.rfcRetransmitCount = 0;
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capwap_killall_timeout(&session->timeout);
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capwap_set_timeout(session->dfa.rfcRetransmitInterval, &session->timeout, CAPWAP_TIMER_CONTROL_CONNECTION);
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ac_dfa_change_state(session, CAPWAP_RESET_STATE);
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status = AC_DFA_ACCEPT_PACKET;
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} else {
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capwap_logging_debug("Warning: error to send reset request packet");
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ac_free_reference_last_request(session);
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ac_dfa_change_state(session, CAPWAP_RESET_TO_DTLS_TEARDOWN_STATE);
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}
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return status;
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}
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/* */
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int ac_dfa_state_run_to_dtlsteardown(struct ac_session_t* session, struct capwap_parsed_packet* packet) {
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return ac_session_teardown_connection(session);
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}
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