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move packet processing from main receive loop into function

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This commit is contained in:
Andreas Schultz 2016-03-27 12:49:44 +02:00
parent a3c2e52d3c
commit 40a98c9075
1 changed files with 154 additions and 147 deletions
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301
src/wtp/wtp_dfa.c
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@ -301,25 +301,166 @@ static void wtp_dfa_closeapp(void) {
ASSERT(g_wtp.state == CAPWAP_DEAD_STATE);
}
static void wtp_dfa_process_packet(void *buffer, int buffersize,
union sockaddr_capwap *fromaddr,
union sockaddr_capwap *toaddr)
{
int check, res;
char plain[CAPWAP_MAX_PACKET_SIZE];
struct capwap_packet_rxmng* rxmngpacket;
struct capwap_parsed_packet packet;
/* Check source */
if (g_wtp.state != CAPWAP_DISCOVERY_STATE &&
capwap_compare_ip(&g_wtp.dtls.peeraddr, fromaddr)) {
capwap_logging_debug("CAPWAP packet from unknown WTP when not in DISCOVERY, drop packet");
return; /* Unknown source */
}
/* Check of packet */
check = capwap_sanity_check(g_wtp.state, buffer, buffersize, g_wtp.dtls.enable);
switch (check) {
case CAPWAP_PLAIN_PACKET:
break;
case CAPWAP_DTLS_PACKET: {
int oldaction = g_wtp.dtls.action;
/* Decrypt packet */
buffersize = capwap_decrypt_packet(&g_wtp.dtls, buffer, buffersize, plain, CAPWAP_MAX_PACKET_SIZE);
if (buffersize > 0) {
buffer = plain;
break;
}
if (buffersize == CAPWAP_ERROR_AGAIN) {
/* Check is handshake complete */
if (oldaction == CAPWAP_DTLS_ACTION_HANDSHAKE &&
g_wtp.dtls.action == CAPWAP_DTLS_ACTION_DATA) {
if (g_wtp.state == CAPWAP_DTLS_CONNECT_STATE) {
wtp_send_join();
} else {
wtp_teardown_connection();
}
}
} else if (oldaction == CAPWAP_DTLS_ACTION_DATA &&
g_wtp.dtls.action == CAPWAP_DTLS_ACTION_SHUTDOWN) {
wtp_teardown_connection();
}
return; /* Next packet */
}
case CAPWAP_WRONG_PACKET:
capwap_logging_debug("Warning: sanity check failure");
/* Drop packet */
return;
default:
/* TODO: Really? Previosly, this was hidden in the
* overly deep indention, check if that is correct */
capwap_logging_debug("Warning: wtp_dfa_running took default fall through");
return;
}
/* Defragment management */
rxmngpacket = wtp_get_packet_rxmng();
/* If request, defragmentation packet */
check = capwap_packet_rxmng_add_recv_packet(rxmngpacket, buffer, buffersize);
if (check == CAPWAP_REQUEST_MORE_FRAGMENT)
return;
if (check != CAPWAP_RECEIVE_COMPLETE_PACKET) {
/* Discard fragments */
wtp_free_packet_rxmng();
return;
}
/* Check for already sent response to packet */
if (capwap_is_request_type(rxmngpacket->ctrlmsg.type) &&
g_wtp.remotetype == rxmngpacket->ctrlmsg.type &&
g_wtp.remoteseqnumber == rxmngpacket->ctrlmsg.seq) {
/* Retransmit response */
if (!capwap_crypt_sendto_fragmentpacket(&g_wtp.dtls, g_wtp.responsefragmentpacket)) {
capwap_logging_error("Error to resend response packet");
} else {
capwap_logging_debug("Retransmitted control packet");
}
/* Discard fragments */
wtp_free_packet_rxmng();
return;
}
/* Check message type */
res = capwap_check_message_type(rxmngpacket);
if (res != VALID_MESSAGE_TYPE) {
if (res == INVALID_REQUEST_MESSAGE_TYPE) {
capwap_logging_warning("Unexpected Unrecognized Request, send Response Packet with error");
wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_MSG_UNEXPECTED_UNRECOGNIZED_REQUEST);
}
capwap_logging_debug("Invalid message type");
wtp_free_packet_rxmng();
return;
}
/* Init */
memset(&packet, 0, sizeof(struct capwap_parsed_packet));
/* Parsing packet */
res = capwap_parsing_packet(rxmngpacket, &packet);
if (res != PARSING_COMPLETE) {
if (res == UNRECOGNIZED_MESSAGE_ELEMENT &&
capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
capwap_logging_warning("Unrecognized Message Element, send Response Packet with error");
wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_UNRECOGNIZED_MESSAGE_ELEMENT);
/* TODO: add the unrecognized message element */
}
/* */
capwap_logging_debug("Failed parsing packet");
capwap_free_parsed_packet(&packet);
wtp_free_packet_rxmng();
return;
}
/* Validate packet */
if (capwap_validate_parsed_packet(&packet, NULL)) {
if (capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
capwap_logging_warning("Missing Mandatory Message Element, send Response Packet with error");
wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_MISSING_MANDATORY_MSG_ELEMENT);
}
/* */
capwap_logging_debug("Failed validation parsed packet");
capwap_free_parsed_packet(&packet);
wtp_free_packet_rxmng();
return;
}
/* Receive a complete packet */
wtp_dfa_execute(&packet);
/* Free packet */
capwap_free_parsed_packet(&packet);
wtp_free_packet_rxmng();
}
/* WTP state machine */
int wtp_dfa_running(void) {
int res;
int wtp_dfa_running(void)
{
int result = CAPWAP_SUCCESSFUL;
char bufferencrypt[CAPWAP_MAX_PACKET_SIZE];
char bufferplain[CAPWAP_MAX_PACKET_SIZE];
char* buffer;
char buffer[CAPWAP_MAX_PACKET_SIZE];
int buffersize;
struct capwap_parsed_packet packet;
int index;
union sockaddr_capwap fromaddr;
union sockaddr_capwap toaddr;
/* Init */
memset(&packet, 0, sizeof(struct capwap_parsed_packet));
/* Configure poll struct */
if (wtp_dfa_init_fdspool(&g_wtp.fds, &g_wtp.net)) {
return CAPWAP_GENERIC_ERROR;
@ -337,13 +478,9 @@ int wtp_dfa_running(void) {
/* */
while (g_wtp.state != CAPWAP_DEAD_STATE) {
int check;
struct capwap_packet_rxmng* rxmngpacket;
/* If request wait packet from AC */
buffer = bufferencrypt;
buffersize = CAPWAP_MAX_PACKET_SIZE;
index = wtp_recvfrom(&g_wtp.fds, buffer, &buffersize, &fromaddr, &toaddr);
buffersize = sizeof(buffer);
index = wtp_recvfrom(&g_wtp.fds, &buffer, &buffersize, &fromaddr, &toaddr);
capwap_logging_debug("WTP got data: idx: %d, size: %d", index, buffersize);
if (!g_wtp.running) {
@ -370,137 +507,7 @@ int wtp_dfa_running(void) {
continue; /* Drop packet */
}
/* Check source */
if (g_wtp.state != CAPWAP_DISCOVERY_STATE &&
capwap_compare_ip(&g_wtp.dtls.peeraddr, &fromaddr)) {
capwap_logging_debug("CAPWAP packet from unknown WTP when not in DISCOVERY, drop packet");
continue; /* Unknown source */
}
/* Check of packet */
check = capwap_sanity_check(g_wtp.state, buffer, buffersize, g_wtp.dtls.enable);
switch (check) {
case CAPWAP_PLAIN_PACKET:
break;
case CAPWAP_DTLS_PACKET: {
int oldaction = g_wtp.dtls.action;
/* Decrypt packet */
buffersize = capwap_decrypt_packet(&g_wtp.dtls, buffer, buffersize, bufferplain, CAPWAP_MAX_PACKET_SIZE);
if (buffersize > 0) {
buffer = bufferplain;
break;
}
if (buffersize == CAPWAP_ERROR_AGAIN) {
/* Check is handshake complete */
if (oldaction == CAPWAP_DTLS_ACTION_HANDSHAKE &&
g_wtp.dtls.action == CAPWAP_DTLS_ACTION_DATA) {
if (g_wtp.state == CAPWAP_DTLS_CONNECT_STATE) {
wtp_send_join();
} else {
wtp_teardown_connection();
}
}
} else if (oldaction == CAPWAP_DTLS_ACTION_DATA &&
g_wtp.dtls.action == CAPWAP_DTLS_ACTION_SHUTDOWN) {
wtp_teardown_connection();
}
continue; /* Next packet */
}
case CAPWAP_WRONG_PACKET:
capwap_logging_debug("Warning: sanity check failure");
/* Drop packet */
continue;
default:
/* TODO: Really? Previosly, this was hidden in the
* overly deep indention, check if that is correct */
capwap_logging_debug("Warning: wtp_dfa_running took default fall through");
continue;
}
/* Defragment management */
rxmngpacket = wtp_get_packet_rxmng();
/* If request, defragmentation packet */
check = capwap_packet_rxmng_add_recv_packet(rxmngpacket, buffer, buffersize);
if (check == CAPWAP_REQUEST_MORE_FRAGMENT)
continue;
if (check != CAPWAP_RECEIVE_COMPLETE_PACKET) {
/* Discard fragments */
wtp_free_packet_rxmng();
continue;
}
/* Check for already response to packet */
if (capwap_is_request_type(rxmngpacket->ctrlmsg.type) && (g_wtp.remotetype == rxmngpacket->ctrlmsg.type) && (g_wtp.remoteseqnumber == rxmngpacket->ctrlmsg.seq)) {
/* Retransmit response */
if (!capwap_crypt_sendto_fragmentpacket(&g_wtp.dtls, g_wtp.responsefragmentpacket)) {
capwap_logging_error("Error to resend response packet");
} else {
capwap_logging_debug("Retrasmitted control packet");
}
/* Discard fragments */
wtp_free_packet_rxmng();
continue;
}
/* Check message type */
res = capwap_check_message_type(rxmngpacket);
if (res != VALID_MESSAGE_TYPE) {
if (res == INVALID_REQUEST_MESSAGE_TYPE) {
capwap_logging_warning("Unexpected Unrecognized Request, send Response Packet with error");
wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_MSG_UNEXPECTED_UNRECOGNIZED_REQUEST);
}
capwap_logging_debug("Invalid message type");
wtp_free_packet_rxmng();
continue;
}
/* Parsing packet */
res = capwap_parsing_packet(rxmngpacket, &packet);
if (res != PARSING_COMPLETE) {
if ((res == UNRECOGNIZED_MESSAGE_ELEMENT) && capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
capwap_logging_warning("Unrecognized Message Element, send Response Packet with error");
wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_UNRECOGNIZED_MESSAGE_ELEMENT);
/* TODO: add the unrecognized message element */
}
/* */
capwap_logging_debug("Failed parsing packet");
capwap_free_parsed_packet(&packet);
wtp_free_packet_rxmng();
continue;
}
/* Validate packet */
if (capwap_validate_parsed_packet(&packet, NULL)) {
if (capwap_is_request_type(rxmngpacket->ctrlmsg.type)) {
capwap_logging_warning("Missing Mandatory Message Element, send Response Packet with error");
wtp_send_invalid_request(rxmngpacket, CAPWAP_RESULTCODE_FAILURE_MISSING_MANDATORY_MSG_ELEMENT);
}
/* */
capwap_logging_debug("Failed validation parsed packet");
capwap_free_parsed_packet(&packet);
wtp_free_packet_rxmng();
continue;
}
/* Receive a complete packet */
wtp_dfa_execute(&packet);
/* Free packet */
capwap_free_parsed_packet(&packet);
wtp_free_packet_rxmng();
wtp_dfa_process_packet(&buffer, buffersize, &fromaddr, &toaddr);
}
/* Free memory */