int csp_send(csp_conn_t * conn, csp_packet_t * packet, uint32_t timeout) {
int ret;
if ((conn == NULL) || (packet == NULL) || (conn->state != CONN_OPEN)) {
csp_log_error("Invalid call to csp_send\r\n");
return 0;
}
#ifdef CSP_USE_RDP
if (conn->idout.flags & CSP_FRDP) {
if (csp_rdp_send(conn, packet, timeout) != CSP_ERR_NONE) {
csp_route_t * ifout = csp_route_if(conn->idout.dst);
if (ifout != NULL && ifout->interface != NULL)
ifout->interface->tx_error++;
csp_log_warn("RDP send failed\r\n!");
return 0;
}
}
#endif
ret = csp_send_direct(conn->idout, packet, timeout);
return (ret == CSP_ERR_NONE) ? 1 : 0;
}
uint8_t csp_route_get_nexthop_mac(uint8_t node) {
csp_route_t * route = csp_route_if(node);
return route->nexthop_mac_addr;
}
int csp_send_direct(csp_id_t idout, csp_packet_t * packet, uint32_t timeout) {
if (packet == NULL) {
csp_log_error("csp_send_direct called with NULL packet\r\n");
goto err;
}
csp_route_t * ifout = csp_route_if(idout.dst);
if ((ifout == NULL) || (ifout->interface == NULL) || (ifout->interface->nexthop == NULL)) {
csp_log_error("No route to host: %#08x\r\n", idout.ext);
goto err;
}
csp_log_packet("Output: Src %u, Dst %u, Dport %u, Sport %u, Pri %u, Flags 0x%02X, Size %u VIA: %s\r\n",
idout.src, idout.dst, idout.dport, idout.sport, idout.pri, idout.flags, packet->length, ifout->interface->name);
/*
* Copy identifier to packet. This originally happened below (after
* encryption), but doing it here makes logging simpler and doesn't
* affect the encryption stuff at all.
*/
packet->id.ext = idout.ext;
/* Log the packet as sent by the application (before encryption) */
if (csp_packet_callback)
csp_packet_callback(CSP_OUTPUT, ifout->interface->name, packet);
#if 0
#ifdef __linux__
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
double sec = ts.tv_sec + ts.tv_nsec / 1e9;
#else
double sec = (float)xTaskGetTickCount() / configTICK_RATE_HZ;
#endif
printf("%.3f: packet contents (%d bytes):", sec,
packet->length);
for (int i = 0; i < packet->length; i++) {
if (i % 16 == 0) printf("\n");
printf("%02x ", packet->data[i]);
}
printf("\n\n");
#endif
#ifdef CSP_USE_PROMISC
/* Loopback traffic is added to promisc queue by the router */
if (idout.dst != my_address && idout.src == my_address) {
packet->id.ext = idout.ext;
csp_promisc_add(packet, csp_promisc_queue);
}
#endif
/* Only encrypt packets from the current node */
if (idout.src == my_address) {
/* Append HMAC */
if (idout.flags & CSP_FHMAC) {
#ifdef CSP_USE_HMAC
/* Calculate and add HMAC */
if (csp_hmac_append(packet) != 0) {
/* HMAC append failed */
csp_log_warn("HMAC append failed!\r\n");
goto tx_err;
}
#else
csp_log_warn("Attempt to send packet with HMAC, but CSP was compiled without HMAC support. Discarding packet\r\n");
goto tx_err;
#endif
}
/* Append CRC32 */
if (idout.flags & CSP_FCRC32) {
#ifdef CSP_USE_CRC32
/* Calculate and add CRC32 */
if (csp_crc32_append(packet) != 0) {
/* CRC32 append failed */
csp_log_warn("CRC32 append failed!\r\n");
goto tx_err;
}
#else
csp_log_warn("Attempt to send packet with CRC32, but CSP was compiled without CRC32 support. Sending without CRC32r\n");
idout.flags &= ~(CSP_FCRC32);
#endif
}
if (idout.flags & CSP_FXTEA) {
#ifdef CSP_USE_XTEA
/* Create nonce */
uint32_t nonce, nonce_n;
nonce = (uint32_t)rand();
nonce_n = csp_hton32(nonce);
memcpy(&packet->data[packet->length], &nonce_n, sizeof(nonce_n));
/* Create initialization vector */
uint32_t iv[2] = {nonce, 1};
/* Encrypt data */
if (csp_xtea_encrypt(packet->data, packet->length, iv) != 0) {
/* Encryption failed */
csp_log_warn("Encryption failed! Discarding packet\r\n");
goto tx_err;
}
packet->length += sizeof(nonce_n);
#else
csp_log_warn("Attempt to send XTEA encrypted packet, but CSP was compiled without XTEA support. Discarding packet\r\n");
goto tx_err;
#endif
}
}
/* Store length before passing to interface */
uint16_t bytes = packet->length;
uint16_t mtu = ifout->interface->mtu;
if (mtu > 0 && bytes > mtu) {
csp_log_warn("Attempt to send a packet larger than the interface's mtu.\r\n");
goto tx_err;
}
/* Log the packet as sent over the interface */
if (csp_packet_callback)
csp_packet_callback(CSP_OUTPUT_RAW, ifout->interface->name, packet);
if ((*ifout->interface->nexthop)(ifout->interface, packet, timeout) != CSP_ERR_NONE)
goto tx_err;
/* Update our transmit-time estimates, if the interface supports it */
if (ifout->interface->tx_ms_per_byte) {
/*
* If the completion time is in the past, that means
* the interface is not currently transmitting.
*/
uint32_t time_now = csp_get_ms();
if (csp_time_after(time_now, ifout->interface->tx_done_time))
ifout->interface->tx_done_time = time_now;
ifout->interface->tx_done_time +=
ifout->interface->tx_ms_per_packet
+ bytes * ifout->interface->tx_ms_per_byte;
#if 0
printf("DEBUG: now %u, expected completion at %u\n",
time_now, ifout->interface->tx_done_time);
#endif
}
ifout->interface->tx++;
ifout->interface->txbytes += bytes;
return CSP_ERR_NONE;
tx_err:
ifout->interface->tx_error++;
err:
return CSP_ERR_TX;
}
int csp_send_direct(csp_id_t idout, csp_packet_t * packet, uint32_t timeout) {
if (packet == NULL) {
csp_log_error("csp_send_direct called with NULL packet\r\n");
goto err;
}
csp_route_t * ifout = csp_route_if(idout.dst);
if ((ifout == NULL) || (ifout->interface == NULL) || (ifout->interface->nexthop == NULL)) {
csp_log_error("No route to host: %#08x\r\n", idout.ext);
goto err;
}
csp_log_packet("Sending packet size %u from %u to %u port %u via interface %s\r\n", packet->length, idout.src, idout.dst, idout.dport, ifout->interface->name);
#ifdef CSP_USE_PROMISC
/* Loopback traffic is added to promisc queue by the router */
if (idout.dst != my_address) {
packet->id.ext = idout.ext;
csp_promisc_add(packet, csp_promisc_queue);
}
#endif
if (idout.flags & CSP_SEQNR) {
#ifdef CSP_USE_SEQNR
/*Append the gloal seqnr. to the packet */
if(csp_seqnr_append(packet) != 0) {
/* SEQNR append failed */
csp_log_warn("SEQNR append failed !\r\n");
goto tx_err;
}
#else
csp_log_warn("Attempt to send packet with SEQNR, but csp was compiled without SEQNR support. Discarding packet\r\n");
goto tx_err;
#endif
}
/* Only encrypt packets from the current node */
if (idout.src == my_address) {
/* Append HMAC */
if (idout.flags & CSP_FHMAC) {
#ifdef CSP_USE_HMAC
/* Calculate and add HMAC */
if (csp_hmac_append(packet) != 0) {
/* HMAC append failed */
csp_log_warn("HMAC append failed!\r\n");
goto tx_err;
}
#else
csp_log_warn("Attempt to send packet with HMAC, but CSP was compiled without HMAC support. Discarding packet\r\n");
goto tx_err;
#endif
}
/* Append CRC32 */
if (idout.flags & CSP_FCRC32) {
#ifdef CSP_USE_CRC32
/* Calculate and add CRC32 */
if (csp_crc32_append(packet) != 0) {
/* CRC32 append failed */
csp_log_warn("CRC32 append failed!\r\n");
goto tx_err;
}
#else
csp_log_warn("Attempt to send packet with CRC32, but CSP was compiled without CRC32 support. Sending without CRC32r\n");
idout.flags &= ~(CSP_FCRC32);
#endif
}
if (idout.flags & CSP_FXTEA) {
#ifdef CSP_USE_XTEA
/* Create nonce */
uint32_t nonce, nonce_n;
nonce = (uint32_t)rand();
nonce_n = csp_hton32(nonce);
memcpy(&packet->data[packet->length], &nonce_n, sizeof(nonce_n));
/* Create initialization vector */
uint32_t iv[2] = {nonce, 1};
/* Encrypt data */
if (csp_xtea_encrypt(packet->data, packet->length, iv) != 0) {
/* Encryption failed */
csp_log_warn("Encryption failed! Discarding packet\r\n");
goto tx_err;
}
packet->length += sizeof(nonce_n);
#else
csp_log_warn("Attempt to send XTEA encrypted packet, but CSP was compiled without XTEA support. Discarding packet\r\n");
goto tx_err;
#endif
}
}
/* Copy identifier to packet */
packet->id.ext = idout.ext;
/* Store length before passing to interface */
uint16_t bytes = packet->length;
uint16_t mtu = ifout->interface->mtu;
if (mtu > 0 && bytes > mtu)
goto tx_err;
if ((*ifout->interface->nexthop)(packet, timeout) != CSP_ERR_NONE)
goto tx_err;
ifout->interface->tx++;
ifout->interface->txbytes += bytes;
return CSP_ERR_NONE;
tx_err:
ifout->interface->tx_error++;
err:
return CSP_ERR_TX;
}
/**
* Function to transmit a frame without an existing connection structure.
* This function is used for stateless transmissions
* @param idout 32bit CSP identifier
* @param packet pointer to packet,
* @param timeout a timeout to wait for TX to complete. NOTE: not all underlying drivers supports flow-control.
* @return returns 1 if successful and 0 otherwise. you MUST free the frame yourself if the transmission was not successful.
*/
int csp_send_direct(csp_id_t idout, csp_packet_t * packet, unsigned int timeout) {
if (packet == NULL) {
csp_debug(CSP_ERROR, "csp_send_direct: packet == NULL\r\n");
return 0;
}
csp_iface_t * ifout = csp_route_if(idout.dst);
if ((ifout == NULL) || (*ifout->nexthop == NULL)) {
csp_debug(CSP_ERROR, "No route to host: %#08x\r\n", idout.ext);
return 0;
}
csp_debug(CSP_PACKET, "Sending packet from %u to %u port %u via interface %s\r\n", idout.src, idout.dst, idout.dport, ifout->name);
ifout->count++;
#if CSP_USE_PROMISC
/* Loopback traffic is added to promisc queue by the router */
if (idout.dst != my_address) {
packet->id.ext = idout.ext;
csp_promisc_add(packet, csp_promisc_queue);
}
#endif
/* Only encrypt packets from the current node */
if (idout.src == my_address && (idout.flags & CSP_FXTEA)) {
#if CSP_ENABLE_XTEA
/* Create nonce */
uint32_t nonce, nonce_n;
nonce = (uint32_t)rand();
nonce_n = htonl(nonce);
memcpy(&packet->data[packet->length], &nonce_n, sizeof(nonce_n));
/* Create initialization vector */
uint32_t iv[2] = {nonce, 1};
/* Encrypt data */
if (xtea_encrypt(packet->data, packet->length, (uint32_t *)CSP_CRYPTO_KEY, iv) != 0) {
/* Encryption failed */
csp_debug(CSP_WARN, "Encryption failed! Discarding packet\r\n");
csp_buffer_free(packet);
return 0;
}
packet->length += sizeof(nonce_n);
#else
csp_debug(CSP_WARN, "Attempt to send XTEA encrypted packet, but CSP was compiled without XTEA support. Discarding packet\r\n");
return 0;
#endif
}
/* Only append HMAC to packets from the current node */
if (idout.src == my_address && (idout.flags & CSP_FHMAC)) {
#if CSP_ENABLE_HMAC
/* Calculate and add HMAC */
if (hmac_append(packet, (uint8_t *)CSP_CRYPTO_KEY, CSP_CRYPTO_KEY_LENGTH) != 0) {
/* HMAC append failed */
csp_debug(CSP_WARN, "HMAC append failed!\r\n");
csp_buffer_free(packet);
return 0;
}
#else
csp_debug(CSP_WARN, "Attempt to send packet with HMAC, but CSP was compiled without HMAC support. Discarding packet\r\n");
return 0;
#endif
}
return (*ifout->nexthop)(idout, packet, timeout);
}