589 lines
15 KiB
C
589 lines
15 KiB
C
#include "wtp.h"
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#include "wtp_dfa.h"
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#include "capwap_array.h"
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#include "capwap_dfa.h"
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#include "capwap_dtls.h"
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#include "wtp_radio.h"
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#include <signal.h>
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#define WTP_RECV_NOERROR_RADIO -1001
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/* Handler signal */
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static void wtp_signal_handler(int signum) {
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if ((signum == SIGINT) || (signum == SIGTERM)) {
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g_wtp.running = 0;
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}
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}
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/* */
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static struct capwap_packet_rxmng* wtp_get_packet_rxmng(void) {
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if (!g_wtp.rxmngpacket) {
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g_wtp.rxmngpacket = capwap_packet_rxmng_create_message();
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}
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return g_wtp.rxmngpacket;
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}
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/* */
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void wtp_free_packet_rxmng(void) {
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if (g_wtp.rxmngpacket) {
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capwap_packet_rxmng_free(g_wtp.rxmngpacket);
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g_wtp.rxmngpacket = NULL;
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}
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}
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/* */
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static void wtp_send_invalid_request(struct capwap_packet_rxmng* rxmngpacket, uint32_t errorcode) {
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struct capwap_header_data capwapheader;
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struct capwap_packet_txmng* txmngpacket;
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struct capwap_list* responsefragmentpacket;
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struct capwap_fragment_packet_item* packet;
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struct capwap_header* header;
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struct capwap_resultcode_element resultcode = { .code = errorcode };
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ASSERT(rxmngpacket != NULL);
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ASSERT(rxmngpacket->fragmentlist->first != NULL);
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/* */
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packet = (struct capwap_fragment_packet_item*)rxmngpacket->fragmentlist->first->item;
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header = (struct capwap_header*)packet->buffer;
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/* Odd message type */
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capwap_header_init(&capwapheader, CAPWAP_RADIOID_NONE, GET_WBID_HEADER(header));
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txmngpacket = capwap_packet_txmng_create_ctrl_message(&capwapheader, rxmngpacket->ctrlmsg.type + 1, rxmngpacket->ctrlmsg.seq, g_wtp.mtu);
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/* Add message element */
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capwap_packet_txmng_add_message_element(txmngpacket, CAPWAP_ELEMENT_RESULTCODE, &resultcode);
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/* Unknown response complete, get fragment packets */
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responsefragmentpacket = capwap_list_create();
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capwap_packet_txmng_get_fragment_packets(txmngpacket, responsefragmentpacket, g_wtp.fragmentid);
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if (responsefragmentpacket->count > 1)
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g_wtp.fragmentid++;
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/* Free packets manager */
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capwap_packet_txmng_free(txmngpacket);
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/* Send unknown response */
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capwap_crypt_sendto_fragmentpacket(&g_wtp.dtls, responsefragmentpacket);
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/* Don't buffering a packets sent */
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capwap_list_free(responsefragmentpacket);
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}
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/* WTP Execute state */
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static void wtp_dfa_execute(struct capwap_parsed_packet* packet)
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{
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ASSERT(packet != NULL);
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switch (g_wtp.state) {
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case CAPWAP_DISCOVERY_STATE:
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wtp_dfa_state_discovery(packet);
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break;
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case CAPWAP_SULKING_STATE:
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wtp_dfa_state_sulking(packet);
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break;
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case CAPWAP_DTLS_CONNECT_STATE:
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wtp_teardown_connection();
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break;
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case CAPWAP_DTLS_TEARDOWN_STATE:
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wtp_dfa_state_dtlsteardown(packet);
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break;
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case CAPWAP_JOIN_STATE:
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wtp_dfa_state_join(packet);
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break;
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case CAPWAP_CONFIGURE_STATE:
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wtp_dfa_state_configure(packet);
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break;
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case CAPWAP_DATA_CHECK_STATE:
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wtp_dfa_state_datacheck(packet);
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break;
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case CAPWAP_RUN_STATE:
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wtp_dfa_state_run(packet);
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break;
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default:
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capwap_logging_debug("Unknown WTP action event: %lu", g_wtp.state);
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wtp_teardown_connection();
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break;
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}
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}
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/* */
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static int wtp_recvfrom(struct wtp_fds* fds, void* buffer, int* size, union sockaddr_capwap* recvfromaddr, union sockaddr_capwap* recvtoaddr) {
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int index;
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ASSERT(fds != NULL);
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ASSERT(fds->fdspoll != NULL);
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ASSERT(fds->fdstotalcount > 0);
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ASSERT(buffer != NULL);
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ASSERT(size != NULL);
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ASSERT(*size > 0);
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ASSERT(recvfromaddr != NULL);
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ASSERT(recvtoaddr != NULL);
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/* Wait packet */
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index = capwap_wait_recvready(fds->fdspoll, fds->fdstotalcount, g_wtp.timeout);
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if (index < 0) {
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return index;
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} else if ((fds->wifieventsstartpos >= 0) && (index >= fds->wifieventsstartpos)) {
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int pos = index - fds->wifieventsstartpos;
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if (pos < fds->wifieventscount) {
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if (!fds->wifievents[pos].event_handler) {
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return CAPWAP_RECV_ERROR_SOCKET;
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}
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fds->wifievents[pos].event_handler(fds->fdspoll[index].fd, fds->wifievents[pos].params, fds->wifievents[pos].paramscount);
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}
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return WTP_RECV_NOERROR_RADIO;
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} else if ((fds->kmodeventsstartpos >= 0) && (index >= fds->kmodeventsstartpos)) {
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int pos = index - fds->kmodeventsstartpos;
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if (pos < fds->kmodeventscount) {
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if (!fds->kmodevents[pos].event_handler) {
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return CAPWAP_RECV_ERROR_SOCKET;
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}
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fds->kmodevents[pos].event_handler(fds->fdspoll[index].fd, fds->kmodevents[pos].params, fds->kmodevents[pos].paramscount);
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}
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return WTP_RECV_NOERROR_RADIO;
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}
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/* Receive packet */
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if (capwap_recvfrom(fds->fdspoll[index].fd, buffer, size, recvfromaddr, recvtoaddr)) {
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return CAPWAP_RECV_ERROR_SOCKET;
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}
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return index;
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}
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/* */
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static int wtp_dfa_init_fdspool(struct wtp_fds* fds, struct capwap_network* net) {
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ASSERT(fds != NULL);
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ASSERT(net != NULL);
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/* */
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memset(fds, 0, sizeof(struct wtp_fds));
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fds->fdsnetworkcount = capwap_network_set_pollfd(net, NULL, 0);
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fds->fdspoll = (struct pollfd*)capwap_alloc(sizeof(struct pollfd) * fds->fdsnetworkcount);
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/* Retrive all socket for polling */
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fds->fdstotalcount = capwap_network_set_pollfd(net, fds->fdspoll, fds->fdsnetworkcount);
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if (fds->fdsnetworkcount != fds->fdstotalcount) {
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capwap_free(fds->fdspoll);
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return -1;
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}
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/* Update Event File Descriptor */
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wtp_dfa_update_fdspool(fds);
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return 0;
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}
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/* */
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int wtp_dfa_update_fdspool(struct wtp_fds* fds) {
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int totalcount;
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int kmodcount;
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int wificount;
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struct pollfd* fdsbuffer;
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ASSERT(fds != NULL);
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/* Retrieve number of Dynamic File Descriptor Event */
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kmodcount = wtp_kmod_getfd(NULL, NULL, 0);
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wificount = wifi_event_getfd(NULL, NULL, 0);
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if ((kmodcount < 0) || (wificount < 0)) {
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return -1;
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}
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/* Kernel Module Events Callback */
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fds->kmodeventsstartpos = -1;
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if (kmodcount != fds->kmodeventscount) {
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if (fds->kmodevents) {
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capwap_free(fds->kmodevents);
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}
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/* */
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fds->kmodeventscount = kmodcount;
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fds->kmodevents = (struct wtp_kmod_event*)((kmodcount > 0) ? capwap_alloc(sizeof(struct wtp_kmod_event) * kmodcount) : NULL);
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}
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/* Wifi Events Callback */
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fds->wifieventsstartpos = -1;
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if (wificount != fds->wifieventscount) {
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if (fds->wifievents) {
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capwap_free(fds->wifievents);
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}
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/* */
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fds->wifieventscount = wificount;
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fds->wifievents = (struct wifi_event*)((wificount > 0) ? capwap_alloc(sizeof(struct wifi_event) * wificount) : NULL);
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}
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/* Resize poll */
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totalcount = fds->fdsnetworkcount + fds->kmodeventscount + fds->wifieventscount;
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if (fds->fdstotalcount != totalcount) {
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fdsbuffer = (struct pollfd*)capwap_alloc(sizeof(struct pollfd) * totalcount);
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if (fds->fdspoll) {
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if (fds->fdsnetworkcount > 0) {
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memcpy(fdsbuffer, fds->fdspoll, sizeof(struct pollfd) * fds->fdsnetworkcount);
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}
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capwap_free(fds->fdspoll);
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}
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/* */
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fds->fdspoll = fdsbuffer;
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fds->fdstotalcount = totalcount;
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}
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/* Retrieve File Descriptor Kernel Module Event */
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if (fds->kmodeventscount > 0) {
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fds->kmodeventsstartpos = fds->fdsnetworkcount;
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wtp_kmod_getfd(&fds->fdspoll[fds->kmodeventsstartpos], fds->kmodevents, fds->kmodeventscount);
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}
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/* Retrieve File Descriptor Wifi Event */
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if (fds->wifieventscount > 0) {
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fds->wifieventsstartpos = fds->fdsnetworkcount + fds->kmodeventscount;
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wifi_event_getfd(&fds->fdspoll[fds->wifieventsstartpos], fds->wifievents, fds->wifieventscount);
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}
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return fds->fdstotalcount;
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}
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/* */
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void wtp_dfa_free_fdspool(struct wtp_fds* fds) {
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ASSERT(fds != NULL);
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if (fds->fdspoll) {
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capwap_free(fds->fdspoll);
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}
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if (fds->kmodevents) {
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capwap_free(fds->kmodevents);
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}
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if (fds->wifievents) {
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capwap_free(fds->wifievents);
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}
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}
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/* */
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static void wtp_dfa_closeapp(void) {
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g_wtp.running = 0;
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/* Teardown */
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wtp_teardown_connection();
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/* Wait RFC teardown timeout */
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for (;;) {
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if (capwap_timeout_wait(capwap_timeout_getcoming(g_wtp.timeout)) < 0) {
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break;
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}
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if (capwap_timeout_hasexpired(g_wtp.timeout) == g_wtp.idtimercontrol) {
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break;
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}
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}
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/* */
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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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{
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int result = CAPWAP_SUCCESSFUL;
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char buffer[CAPWAP_MAX_PACKET_SIZE];
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int buffersize;
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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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/* 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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}
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/* Handler signal */
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g_wtp.running = 1;
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signal(SIGPIPE, SIG_IGN);
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signal(SIGINT, wtp_signal_handler);
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signal(SIGTERM, wtp_signal_handler);
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/* Init complete, start DFA */
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wtp_dfa_change_state(CAPWAP_IDLE_STATE);
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wtp_dfa_state_idle();
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/* */
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while (g_wtp.state != CAPWAP_DEAD_STATE) {
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/* If request wait packet from AC */
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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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capwap_logging_debug("Closing WTP, Teardown connection");
|
|
wtp_dfa_closeapp();
|
|
break;
|
|
}
|
|
|
|
if (index == CAPWAP_RECV_ERROR_INTR ||
|
|
index == WTP_RECV_NOERROR_RADIO) {
|
|
/* Ignore recv */
|
|
continue;
|
|
} else if (index == CAPWAP_RECV_ERROR_SOCKET) {
|
|
/* Socket close */
|
|
break;
|
|
} else if (index < 0) {
|
|
continue;
|
|
/* TODO: Really? Previosly, this was hidden in the
|
|
* overly deep indention, check if that is correct */
|
|
}
|
|
|
|
if (g_wtp.teardown) {
|
|
capwap_logging_debug("WTP is in teardown, drop packet");
|
|
continue; /* Drop packet */
|
|
}
|
|
|
|
wtp_dfa_process_packet(&buffer, buffersize, &fromaddr, &toaddr);
|
|
}
|
|
|
|
/* Free memory */
|
|
wtp_dfa_free_fdspool(&g_wtp.fds);
|
|
return result;
|
|
}
|
|
|
|
/* Change WTP state machine */
|
|
void wtp_dfa_change_state(int state) {
|
|
if (state != g_wtp.state) {
|
|
capwap_logging_debug("WTP change state from %s to %s", capwap_dfa_getname(g_wtp.state), capwap_dfa_getname(state));
|
|
g_wtp.state = state;
|
|
}
|
|
}
|
|
|
|
/* */
|
|
void wtp_free_reference_last_request(void) {
|
|
capwap_list_flush(g_wtp.requestfragmentpacket);
|
|
}
|
|
|
|
/* */
|
|
void wtp_free_reference_last_response(void) {
|
|
capwap_list_flush(g_wtp.responsefragmentpacket);
|
|
g_wtp.remotetype = 0;
|
|
g_wtp.remoteseqnumber = 0;
|
|
}
|
|
|
|
/* */
|
|
void wtp_dfa_retransmition_timeout(struct capwap_timeout* timeout, unsigned long index,
|
|
void* context, void* param)
|
|
{
|
|
if (!g_wtp.requestfragmentpacket->count) {
|
|
capwap_logging_warning("Invalid retransmition request packet");
|
|
wtp_teardown_connection();
|
|
|
|
return;
|
|
}
|
|
|
|
g_wtp.retransmitcount++;
|
|
if (g_wtp.retransmitcount >= WTP_MAX_RETRANSMIT) {
|
|
capwap_logging_info("Retransmition request packet timeout");
|
|
|
|
/* Timeout state */
|
|
wtp_free_reference_last_request();
|
|
wtp_teardown_connection();
|
|
|
|
return;
|
|
}
|
|
|
|
/* Retransmit request */
|
|
capwap_logging_debug("Retransmition request packet");
|
|
if (!capwap_crypt_sendto_fragmentpacket(&g_wtp.dtls, g_wtp.requestfragmentpacket)) {
|
|
capwap_logging_error("Error to send request packet");
|
|
}
|
|
|
|
/* Update timeout */
|
|
capwap_timeout_set(g_wtp.timeout, g_wtp.idtimercontrol, WTP_RETRANSMIT_INTERVAL,
|
|
wtp_dfa_retransmition_timeout, NULL, NULL);
|
|
}
|
|
|
|
void wtp_reset_state(void)
|
|
{
|
|
/* reset WTP state */
|
|
wtp_radio_reset();
|
|
|
|
wtp_free_reference_last_request();
|
|
wtp_free_reference_last_response();
|
|
wtp_free_packet_rxmng();
|
|
|
|
g_wtp.mtu = CAPWAP_MTU_DEFAULT;
|
|
g_wtp.remotetype = 0;
|
|
g_wtp.remoteseqnumber = WTP_INIT_REMOTE_SEQUENCE;
|
|
|
|
memset(&g_wtp.dtls.localaddr, 0, sizeof(g_wtp.dtls.localaddr));
|
|
memset(&g_wtp.dtls.peeraddr, 0, sizeof(g_wtp.dtls.peeraddr));
|
|
|
|
CAPWAP_SET_NETWORK_PORT(&g_wtp.net.localaddr, 0);
|
|
}
|