move packet processing from main receive loop into function
This commit is contained in:
Andreas Schultz
parent
a3c2e52d3c
commit
40a98c9075
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@ -301,25 +301,166 @@ static void wtp_dfa_closeapp(void) {
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ASSERT(g_wtp.state == CAPWAP_DEAD_STATE);
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}
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static void wtp_dfa_process_packet(void *buffer, int buffersize,
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union sockaddr_capwap *fromaddr,
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union sockaddr_capwap *toaddr)
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{
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int check, res;
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char plain[CAPWAP_MAX_PACKET_SIZE];
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struct capwap_packet_rxmng* rxmngpacket;
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struct capwap_parsed_packet packet;
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/* Check source */
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if (g_wtp.state != CAPWAP_DISCOVERY_STATE &&
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capwap_compare_ip(&g_wtp.dtls.peeraddr, fromaddr)) {
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capwap_logging_debug("CAPWAP packet from unknown WTP when not in DISCOVERY, drop packet");
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return; /* Unknown source */
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}
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/* Check of packet */
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check = capwap_sanity_check(g_wtp.state, buffer, buffersize, g_wtp.dtls.enable);
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switch (check) {
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case CAPWAP_PLAIN_PACKET:
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break;
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case CAPWAP_DTLS_PACKET: {
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int oldaction = g_wtp.dtls.action;
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/* Decrypt packet */
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buffersize = capwap_decrypt_packet(&g_wtp.dtls, buffer, buffersize, plain, CAPWAP_MAX_PACKET_SIZE);
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if (buffersize > 0) {
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buffer = plain;
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break;
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}
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if (buffersize == CAPWAP_ERROR_AGAIN) {
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/* Check is handshake complete */
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if (oldaction == CAPWAP_DTLS_ACTION_HANDSHAKE &&
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g_wtp.dtls.action == CAPWAP_DTLS_ACTION_DATA) {
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if (g_wtp.state == CAPWAP_DTLS_CONNECT_STATE) {
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wtp_send_join();
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} else {
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wtp_teardown_connection();
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}
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}
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} else if (oldaction == CAPWAP_DTLS_ACTION_DATA &&
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g_wtp.dtls.action == CAPWAP_DTLS_ACTION_SHUTDOWN) {
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wtp_teardown_connection();
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}
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return; /* Next packet */
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}
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case CAPWAP_WRONG_PACKET:
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capwap_logging_debug("Warning: sanity check failure");
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/* Drop packet */
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return;
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default:
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/* TODO: Really? Previosly, this was hidden in the
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* overly deep indention, check if that is correct */
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capwap_logging_debug("Warning: wtp_dfa_running took default fall through");
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return;
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}
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/* Defragment management */
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rxmngpacket = wtp_get_packet_rxmng();
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/* If request, defragmentation packet */
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check = capwap_packet_rxmng_add_recv_packet(rxmngpacket, buffer, buffersize);
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if (check == CAPWAP_REQUEST_MORE_FRAGMENT)
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return;
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if (check != CAPWAP_RECEIVE_COMPLETE_PACKET) {
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/* Discard fragments */
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wtp_free_packet_rxmng();
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return;
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}
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/* Check for already sent response to packet */
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if (capwap_is_request_type(rxmngpacket->ctrlmsg.type) &&
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g_wtp.remotetype == rxmngpacket->ctrlmsg.type &&
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g_wtp.remoteseqnumber == rxmngpacket->ctrlmsg.seq) {
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/* Retransmit response */
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if (!capwap_crypt_sendto_fragmentpacket(&g_wtp.dtls, g_wtp.responsefragmentpacket)) {
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capwap_logging_error("Error to resend response packet");
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} else {
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capwap_logging_debug("Retransmitted control packet");
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}
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/* Discard fragments */
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wtp_free_packet_rxmng();
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return;
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}
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/* Check message type */
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res = capwap_check_message_type(rxmngpacket);
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if (res != VALID_MESSAGE_TYPE) {
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if (res == INVALID_REQUEST_MESSAGE_TYPE) {
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capwap_logging_warning("Unexpected Unrecognized Request, send Response Packet with error");
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wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_MSG_UNEXPECTED_UNRECOGNIZED_REQUEST);
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}
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capwap_logging_debug("Invalid message type");
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wtp_free_packet_rxmng();
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return;
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}
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/* Init */
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memset(&packet, 0, sizeof(struct capwap_parsed_packet));
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/* Parsing packet */
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res = capwap_parsing_packet(rxmngpacket, &packet);
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if (res != PARSING_COMPLETE) {
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if (res == UNRECOGNIZED_MESSAGE_ELEMENT &&
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capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
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capwap_logging_warning("Unrecognized Message Element, send Response Packet with error");
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wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_UNRECOGNIZED_MESSAGE_ELEMENT);
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/* TODO: add the unrecognized message element */
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}
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/* */
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capwap_logging_debug("Failed parsing packet");
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capwap_free_parsed_packet(&packet);
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wtp_free_packet_rxmng();
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return;
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}
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/* Validate packet */
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if (capwap_validate_parsed_packet(&packet, NULL)) {
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if (capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
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capwap_logging_warning("Missing Mandatory Message Element, send Response Packet with error");
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wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_MISSING_MANDATORY_MSG_ELEMENT);
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}
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/* */
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capwap_logging_debug("Failed validation parsed packet");
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capwap_free_parsed_packet(&packet);
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wtp_free_packet_rxmng();
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return;
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}
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/* Receive a complete packet */
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wtp_dfa_execute(&packet);
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/* Free packet */
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capwap_free_parsed_packet(&packet);
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wtp_free_packet_rxmng();
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}
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/* WTP state machine */
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int wtp_dfa_running(void) {
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int res;
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int wtp_dfa_running(void)
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{
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int result = CAPWAP_SUCCESSFUL;
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char bufferencrypt[CAPWAP_MAX_PACKET_SIZE];
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char bufferplain[CAPWAP_MAX_PACKET_SIZE];
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char* buffer;
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char buffer[CAPWAP_MAX_PACKET_SIZE];
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int buffersize;
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struct capwap_parsed_packet packet;
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int index;
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union sockaddr_capwap fromaddr;
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union sockaddr_capwap toaddr;
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/* Init */
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memset(&packet, 0, sizeof(struct capwap_parsed_packet));
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/* Configure poll struct */
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if (wtp_dfa_init_fdspool(&g_wtp.fds, &g_wtp.net)) {
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return CAPWAP_GENERIC_ERROR;
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@ -337,13 +478,9 @@ int wtp_dfa_running(void) {
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/* */
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while (g_wtp.state != CAPWAP_DEAD_STATE) {
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int check;
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struct capwap_packet_rxmng* rxmngpacket;
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/* If request wait packet from AC */
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buffer = bufferencrypt;
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buffersize = CAPWAP_MAX_PACKET_SIZE;
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index = wtp_recvfrom(&g_wtp.fds, buffer, &buffersize, &fromaddr, &toaddr);
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buffersize = sizeof(buffer);
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index = wtp_recvfrom(&g_wtp.fds, &buffer, &buffersize, &fromaddr, &toaddr);
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capwap_logging_debug("WTP got data: idx: %d, size: %d", index, buffersize);
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if (!g_wtp.running) {
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@ -370,137 +507,7 @@ int wtp_dfa_running(void) {
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continue; /* Drop packet */
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}
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/* Check source */
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if (g_wtp.state != CAPWAP_DISCOVERY_STATE &&
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capwap_compare_ip(&g_wtp.dtls.peeraddr, &fromaddr)) {
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capwap_logging_debug("CAPWAP packet from unknown WTP when not in DISCOVERY, drop packet");
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continue; /* Unknown source */
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}
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/* Check of packet */
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check = capwap_sanity_check(g_wtp.state, buffer, buffersize, g_wtp.dtls.enable);
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switch (check) {
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case CAPWAP_PLAIN_PACKET:
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break;
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case CAPWAP_DTLS_PACKET: {
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int oldaction = g_wtp.dtls.action;
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/* Decrypt packet */
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buffersize = capwap_decrypt_packet(&g_wtp.dtls, buffer, buffersize, bufferplain, CAPWAP_MAX_PACKET_SIZE);
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if (buffersize > 0) {
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buffer = bufferplain;
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break;
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}
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if (buffersize == CAPWAP_ERROR_AGAIN) {
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/* Check is handshake complete */
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if (oldaction == CAPWAP_DTLS_ACTION_HANDSHAKE &&
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g_wtp.dtls.action == CAPWAP_DTLS_ACTION_DATA) {
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if (g_wtp.state == CAPWAP_DTLS_CONNECT_STATE) {
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wtp_send_join();
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} else {
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wtp_teardown_connection();
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}
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}
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} else if (oldaction == CAPWAP_DTLS_ACTION_DATA &&
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g_wtp.dtls.action == CAPWAP_DTLS_ACTION_SHUTDOWN) {
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wtp_teardown_connection();
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}
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continue; /* Next packet */
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}
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case CAPWAP_WRONG_PACKET:
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capwap_logging_debug("Warning: sanity check failure");
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/* Drop packet */
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continue;
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default:
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/* TODO: Really? Previosly, this was hidden in the
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* overly deep indention, check if that is correct */
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capwap_logging_debug("Warning: wtp_dfa_running took default fall through");
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continue;
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}
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/* Defragment management */
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rxmngpacket = wtp_get_packet_rxmng();
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/* If request, defragmentation packet */
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check = capwap_packet_rxmng_add_recv_packet(rxmngpacket, buffer, buffersize);
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if (check == CAPWAP_REQUEST_MORE_FRAGMENT)
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continue;
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if (check != CAPWAP_RECEIVE_COMPLETE_PACKET) {
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/* Discard fragments */
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wtp_free_packet_rxmng();
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continue;
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}
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/* Check for already response to packet */
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if (capwap_is_request_type(rxmngpacket->ctrlmsg.type) && (g_wtp.remotetype == rxmngpacket->ctrlmsg.type) && (g_wtp.remoteseqnumber == rxmngpacket->ctrlmsg.seq)) {
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/* Retransmit response */
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if (!capwap_crypt_sendto_fragmentpacket(&g_wtp.dtls, g_wtp.responsefragmentpacket)) {
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capwap_logging_error("Error to resend response packet");
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} else {
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capwap_logging_debug("Retrasmitted control packet");
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}
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/* Discard fragments */
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wtp_free_packet_rxmng();
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continue;
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}
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/* Check message type */
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res = capwap_check_message_type(rxmngpacket);
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if (res != VALID_MESSAGE_TYPE) {
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if (res == INVALID_REQUEST_MESSAGE_TYPE) {
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capwap_logging_warning("Unexpected Unrecognized Request, send Response Packet with error");
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wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_MSG_UNEXPECTED_UNRECOGNIZED_REQUEST);
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}
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capwap_logging_debug("Invalid message type");
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wtp_free_packet_rxmng();
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continue;
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}
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/* Parsing packet */
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res = capwap_parsing_packet(rxmngpacket, &packet);
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if (res != PARSING_COMPLETE) {
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if ((res == UNRECOGNIZED_MESSAGE_ELEMENT) && capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
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capwap_logging_warning("Unrecognized Message Element, send Response Packet with error");
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wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_UNRECOGNIZED_MESSAGE_ELEMENT);
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/* TODO: add the unrecognized message element */
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}
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/* */
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capwap_logging_debug("Failed parsing packet");
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capwap_free_parsed_packet(&packet);
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wtp_free_packet_rxmng();
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continue;
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}
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/* Validate packet */
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if (capwap_validate_parsed_packet(&packet, NULL)) {
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if (capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
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capwap_logging_warning("Missing Mandatory Message Element, send Response Packet with error");
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wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_MISSING_MANDATORY_MSG_ELEMENT);
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}
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/* */
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capwap_logging_debug("Failed validation parsed packet");
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capwap_free_parsed_packet(&packet);
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wtp_free_packet_rxmng();
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continue;
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}
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/* Receive a complete packet */
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wtp_dfa_execute(&packet);
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/* Free packet */
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capwap_free_parsed_packet(&packet);
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wtp_free_packet_rxmng();
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wtp_dfa_process_packet(&buffer, buffersize, &fromaddr, &toaddr);
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}
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/* Free memory */
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