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Diffstat (limited to '')
| -rw-r--r-- | lib/libdvben50221/en50221_transport.c | 1296 |
1 files changed, 1296 insertions, 0 deletions
diff --git a/lib/libdvben50221/en50221_transport.c b/lib/libdvben50221/en50221_transport.c new file mode 100644 index 0000000..f6f46db --- /dev/null +++ b/lib/libdvben50221/en50221_transport.c @@ -0,0 +1,1296 @@ +/* + en50221 encoder An implementation for libdvb + an implementation for the en50221 transport layer + + Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com> + Copyright (C) 2005 Julian Scheel (julian at jusst dot de) + Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net) + + This library is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of + the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with this library; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ + +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <pthread.h> +#include <fcntl.h> +#include <sys/ioctl.h> +#include <sys/poll.h> +#include <time.h> +#include <libdvbmisc/dvbmisc.h> +#include <libdvbapi/dvbca.h> +#include "en50221_errno.h" +#include "en50221_transport.h" +#include "asn_1.h" + +// these are the Transport Tags, like +// described in EN50221, Annex A.4.1.13 (pg70) +#define T_SB 0x80 // sb primitive h<--m +#define T_RCV 0x81 // receive primitive h-->m +#define T_CREATE_T_C 0x82 // create transport connection primitive h-->m +#define T_C_T_C_REPLY 0x83 // ctc reply primitive h<--m +#define T_DELETE_T_C 0x84 // delete tc primitive h<->m +#define T_D_T_C_REPLY 0x85 // dtc reply primitive h<->m +#define T_REQUEST_T_C 0x86 // request transport connection primitive h<--m +#define T_NEW_T_C 0x87 // new tc / reply to t_request primitive h-->m +#define T_T_C_ERROR 0x77 // error creating tc primitive h-->m +#define T_DATA_LAST 0xA0 // convey data from higher constructed h<->m + // layers +#define T_DATA_MORE 0xA1 // convey data from higher constructed h<->m + // layers + +struct en50221_message { + struct en50221_message *next; + uint32_t length; + uint8_t data[0]; +}; + +struct en50221_connection { + uint32_t state; // the current state: idle/in_delete/in_create/active + struct timeval tx_time; // time last request was sent from host->module, or 0 if ok + struct timeval last_poll_time; // time of last poll transmission + uint8_t *chain_buffer; // used to save parts of chained packets + uint32_t buffer_length; + + struct en50221_message *send_queue; + struct en50221_message *send_queue_tail; +}; + +struct en50221_slot { + int ca_hndl; + uint8_t slot; // CAM slot + struct en50221_connection *connections; + + pthread_mutex_t slot_lock; + + uint32_t response_timeout; + uint32_t poll_delay; +}; + +struct en50221_transport_layer { + uint8_t max_slots; + uint8_t max_connections_per_slot; + struct en50221_slot *slots; + struct pollfd *slot_pollfds; + int slots_changed; + + pthread_mutex_t global_lock; + pthread_mutex_t setcallback_lock; + + int error; + int error_slot; + + en50221_tl_callback callback; + void *callback_arg; +}; + +static int en50221_tl_process_data(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t * data, + uint32_t data_length); +static int en50221_tl_poll_tc(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id); +static int en50221_tl_alloc_new_tc(struct en50221_transport_layer *tl, + uint8_t slot_id); +static void queue_message(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + struct en50221_message *msg); +static int en50221_tl_handle_create_tc_reply(struct en50221_transport_layer + *tl, uint8_t slot_id, + uint8_t connection_id); +static int en50221_tl_handle_delete_tc(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id); +static int en50221_tl_handle_delete_tc_reply(struct en50221_transport_layer + *tl, uint8_t slot_id, + uint8_t connection_id); +static int en50221_tl_handle_request_tc(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id); +static int en50221_tl_handle_data_more(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id, + uint8_t * data, + uint32_t data_length); +static int en50221_tl_handle_data_last(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id, + uint8_t * data, + uint32_t data_length); +static int en50221_tl_handle_sb(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + uint8_t * data, uint32_t data_length); + + +struct en50221_transport_layer *en50221_tl_create(uint8_t max_slots, + uint8_t + max_connections_per_slot) +{ + struct en50221_transport_layer *tl = NULL; + int i; + int j; + + // setup structure + tl = (struct en50221_transport_layer *) + malloc(sizeof(struct en50221_transport_layer)); + if (tl == NULL) + goto error_exit; + tl->max_slots = max_slots; + tl->max_connections_per_slot = max_connections_per_slot; + tl->slots = NULL; + tl->slot_pollfds = NULL; + tl->slots_changed = 1; + tl->callback = NULL; + tl->callback_arg = NULL; + tl->error_slot = 0; + tl->error = 0; + pthread_mutex_init(&tl->global_lock, NULL); + pthread_mutex_init(&tl->setcallback_lock, NULL); + + // create the slots + tl->slots = malloc(sizeof(struct en50221_slot) * max_slots); + if (tl->slots == NULL) + goto error_exit; + + // set them up + for (i = 0; i < max_slots; i++) { + tl->slots[i].ca_hndl = -1; + + // create the connections for this slot + tl->slots[i].connections = + malloc(sizeof(struct en50221_connection) * max_connections_per_slot); + if (tl->slots[i].connections == NULL) + goto error_exit; + + // create a mutex for the slot + pthread_mutex_init(&tl->slots[i].slot_lock, NULL); + + // set them up + for (j = 0; j < max_connections_per_slot; j++) { + tl->slots[i].connections[j].state = T_STATE_IDLE; + tl->slots[i].connections[j].tx_time.tv_sec = 0; + tl->slots[i].connections[j].last_poll_time.tv_sec = 0; + tl->slots[i].connections[j].last_poll_time.tv_usec = 0; + tl->slots[i].connections[j].chain_buffer = NULL; + tl->slots[i].connections[j].buffer_length = 0; + tl->slots[i].connections[j].send_queue = NULL; + tl->slots[i].connections[j].send_queue_tail = NULL; + } + } + + // create the pollfds + tl->slot_pollfds = malloc(sizeof(struct pollfd) * max_slots); + if (tl->slot_pollfds == NULL) { + goto error_exit; + } + memset(tl->slot_pollfds, 0, sizeof(struct pollfd) * max_slots); + + return tl; + + error_exit: + en50221_tl_destroy(tl); + return NULL; +} + +// Destroy an instance of the transport layer +void en50221_tl_destroy(struct en50221_transport_layer *tl) +{ + int i, j; + + if (tl) { + if (tl->slots) { + for (i = 0; i < tl->max_slots; i++) { + if (tl->slots[i].connections) { + for (j = 0; j < tl->max_connections_per_slot; j++) { + if (tl->slots[i].connections[j].chain_buffer) { + free(tl->slots[i].connections[j].chain_buffer); + } + + struct en50221_message *cur_msg = + tl->slots[i].connections[j].send_queue; + while (cur_msg) { + struct en50221_message *next_msg = cur_msg->next; + free(cur_msg); + cur_msg = next_msg; + } + tl->slots[i].connections[j].send_queue = NULL; + tl->slots[i].connections[j].send_queue_tail = NULL; + } + free(tl->slots[i].connections); + pthread_mutex_destroy(&tl->slots[i].slot_lock); + } + } + free(tl->slots); + } + if (tl->slot_pollfds) { + free(tl->slot_pollfds); + } + pthread_mutex_destroy(&tl->setcallback_lock); + pthread_mutex_destroy(&tl->global_lock); + free(tl); + } +} + +// this can be called from the user-space app to +// register new slots that we should work with +int en50221_tl_register_slot(struct en50221_transport_layer *tl, + int ca_hndl, uint8_t slot, + uint32_t response_timeout, + uint32_t poll_delay) +{ + // lock + pthread_mutex_lock(&tl->global_lock); + + // we browse through the array of slots + // to look for the first unused one + int i; + int16_t slot_id = -1; + for (i = 0; i < tl->max_slots; i++) { + if (tl->slots[i].ca_hndl == -1) { + slot_id = i; + break; + } + } + if (slot_id == -1) { + tl->error = EN50221ERR_OUTOFSLOTS; + pthread_mutex_unlock(&tl->global_lock); + return -1; + } + // set up the slot struct + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + tl->slots[slot_id].ca_hndl = ca_hndl; + tl->slots[slot_id].slot = slot; + tl->slots[slot_id].response_timeout = response_timeout; + tl->slots[slot_id].poll_delay = poll_delay; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + + tl->slots_changed = 1; + pthread_mutex_unlock(&tl->global_lock); + return slot_id; +} + +void en50221_tl_destroy_slot(struct en50221_transport_layer *tl, + uint8_t slot_id) +{ + int i; + + if (slot_id >= tl->max_slots) + return; + + // lock + pthread_mutex_lock(&tl->global_lock); + + // clear the slot + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + tl->slots[slot_id].ca_hndl = -1; + for (i = 0; i < tl->max_connections_per_slot; i++) { + tl->slots[slot_id].connections[i].state = T_STATE_IDLE; + tl->slots[slot_id].connections[i].tx_time.tv_sec = 0; + tl->slots[slot_id].connections[i].last_poll_time.tv_sec = 0; + tl->slots[slot_id].connections[i].last_poll_time.tv_usec = 0; + if (tl->slots[slot_id].connections[i].chain_buffer) { + free(tl->slots[slot_id].connections[i]. + chain_buffer); + } + tl->slots[slot_id].connections[i].chain_buffer = NULL; + tl->slots[slot_id].connections[i].buffer_length = 0; + + struct en50221_message *cur_msg = + tl->slots[slot_id].connections[i].send_queue; + while (cur_msg) { + struct en50221_message *next_msg = cur_msg->next; + free(cur_msg); + cur_msg = next_msg; + } + tl->slots[slot_id].connections[i].send_queue = NULL; + tl->slots[slot_id].connections[i].send_queue_tail = NULL; + } + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + + // tell upper layers + pthread_mutex_lock(&tl->setcallback_lock); + en50221_tl_callback cb = tl->callback; + void *cb_arg = tl->callback_arg; + pthread_mutex_unlock(&tl->setcallback_lock); + if (cb) + cb(cb_arg, T_CALLBACK_REASON_SLOTCLOSE, NULL, 0, slot_id, 0); + + tl->slots_changed = 1; + pthread_mutex_unlock(&tl->global_lock); +} + +int en50221_tl_poll(struct en50221_transport_layer *tl) +{ + uint8_t data[4096]; + int slot_id; + int j; + + // make up pollfds if the slots have changed + pthread_mutex_lock(&tl->global_lock); + if (tl->slots_changed) { + for (slot_id = 0; slot_id < tl->max_slots; slot_id++) { + if (tl->slots[slot_id].ca_hndl != -1) { + tl->slot_pollfds[slot_id].fd = tl->slots[slot_id].ca_hndl; + tl->slot_pollfds[slot_id].events = POLLIN | POLLPRI | POLLERR; + tl->slot_pollfds[slot_id].revents = 0; + } else { + tl->slot_pollfds[slot_id].fd = 0; + tl->slot_pollfds[slot_id].events = 0; + tl->slot_pollfds[slot_id].revents = 0; + } + } + tl->slots_changed = 0; + } + pthread_mutex_unlock(&tl->global_lock); + + // anything happened? + if (poll(tl->slot_pollfds, tl->max_slots, 10) < 0) { + tl->error_slot = -1; + tl->error = EN50221ERR_CAREAD; + return -1; + } + // go through all slots (even though poll may not have reported any events + for (slot_id = 0; slot_id < tl->max_slots; slot_id++) { + + // check if this slot is still used and get its handle + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + if (tl->slots[slot_id].ca_hndl == -1) { + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + continue; + } + int ca_hndl = tl->slots[slot_id].ca_hndl; + + if (tl->slot_pollfds[slot_id].revents & (POLLPRI | POLLIN)) { + // read data + uint8_t r_slot_id; + uint8_t connection_id; + int readcnt = dvbca_link_read(ca_hndl, &r_slot_id, + &connection_id, + data, sizeof(data)); + if (readcnt < 0) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAREAD; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // process it if we got some + if (readcnt > 0) { + if (tl->slots[slot_id].slot != r_slot_id) { + // this message is for an other CAM of the same CA + int new_slot_id; + for (new_slot_id = 0; new_slot_id < tl->max_slots; new_slot_id++) { + if ((tl->slots[new_slot_id].ca_hndl == ca_hndl) && + (tl->slots[new_slot_id].slot == r_slot_id)) + break; + } + if (new_slot_id != tl->max_slots) { + // we found the requested CAM + pthread_mutex_lock(&tl->slots[new_slot_id].slot_lock); + if (en50221_tl_process_data(tl, new_slot_id, data, readcnt)) { + pthread_mutex_unlock(&tl->slots[new_slot_id].slot_lock); + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + pthread_mutex_unlock(&tl->slots[new_slot_id].slot_lock); + } else { + tl->error = EN50221ERR_BADSLOTID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + } else + if (en50221_tl_process_data(tl, slot_id, data, readcnt)) { + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + } + } else if (tl->slot_pollfds[slot_id].revents & POLLERR) { + // an error was reported + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAREAD; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // poll the connections on this slot + check for timeouts + for (j = 0; j < tl->max_connections_per_slot; j++) { + // ignore connection if idle + if (tl->slots[slot_id].connections[j].state == T_STATE_IDLE) { + continue; + } + // send queued data + if (tl->slots[slot_id].connections[j].state & + (T_STATE_IN_CREATION | T_STATE_ACTIVE | T_STATE_ACTIVE_DELETEQUEUED)) { + // send data if there is some to go and we're not waiting for a response already + if (tl->slots[slot_id].connections[j].send_queue && + (tl->slots[slot_id].connections[j].tx_time.tv_sec == 0)) { + + // get the message + struct en50221_message *msg = + tl->slots[slot_id].connections[j].send_queue; + if (msg->next != NULL) { + tl->slots[slot_id].connections[j].send_queue = msg->next; + } else { + tl->slots[slot_id].connections[j].send_queue = NULL; + tl->slots[slot_id].connections[j].send_queue_tail = NULL; + } + + // send the message + if (dvbca_link_write(tl->slots[slot_id].ca_hndl, + tl->slots[slot_id].slot, + j, + msg->data, msg->length) < 0) { + free(msg); + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + print(LOG_LEVEL, ERROR, 1, "CAWrite failed"); + return -1; + } + gettimeofday(&tl->slots[slot_id].connections[j].tx_time, 0); + + // fixup connection state for T_DELETE_T_C + if (msg->length && (msg->data[0] == T_DELETE_T_C)) { + tl->slots[slot_id].connections[j].state = T_STATE_IN_DELETION; + if (tl->slots[slot_id].connections[j].chain_buffer) { + free(tl->slots[slot_id].connections[j].chain_buffer); + } + tl->slots[slot_id].connections[j].chain_buffer = NULL; + tl->slots[slot_id].connections[j].buffer_length = 0; + } + + free(msg); + } + } + // poll it if we're not expecting a reponse and the poll time has elapsed + if (tl->slots[slot_id].connections[j].state & T_STATE_ACTIVE) { + if ((tl->slots[slot_id].connections[j].tx_time.tv_sec == 0) && + (time_after(tl->slots[slot_id].connections[j].last_poll_time, + tl->slots[slot_id].poll_delay))) { + + gettimeofday(&tl->slots[slot_id].connections[j].last_poll_time, 0); + if (en50221_tl_poll_tc(tl, slot_id, j)) { + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + } + } + + // check for timeouts - in any state + if (tl->slots[slot_id].connections[j].tx_time.tv_sec && + (time_after(tl->slots[slot_id].connections[j].tx_time, + tl->slots[slot_id].response_timeout))) { + + if (tl->slots[slot_id].connections[j].state & + (T_STATE_IN_CREATION |T_STATE_IN_DELETION)) { + tl->slots[slot_id].connections[j].state = T_STATE_IDLE; + } else if (tl->slots[slot_id].connections[j].state & + (T_STATE_ACTIVE | T_STATE_ACTIVE_DELETEQUEUED)) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_TIMEOUT; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + } + } + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + } + + return 0; +} + +void en50221_tl_register_callback(struct en50221_transport_layer *tl, + en50221_tl_callback callback, void *arg) +{ + pthread_mutex_lock(&tl->setcallback_lock); + tl->callback = callback; + tl->callback_arg = arg; + pthread_mutex_unlock(&tl->setcallback_lock); +} + +int en50221_tl_get_error_slot(struct en50221_transport_layer *tl) +{ + return tl->error_slot; +} + +int en50221_tl_get_error(struct en50221_transport_layer *tl) +{ + return tl->error; +} + +int en50221_tl_send_data(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + uint8_t * data, uint32_t data_size) +{ +#ifdef DEBUG_TXDATA + printf("[[[[[[[[[[[[[[[[[[[[\n"); + uint32_t ii = 0; + for (ii = 0; ii < data_size; ii++) { + printf("%02x: %02x\n", ii, data[ii]); + } + printf("]]]]]]]]]]]]]]]]]]]]\n"); +#endif + + if (slot_id >= tl->max_slots) { + tl->error = EN50221ERR_BADSLOTID; + return -1; + } + + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + if (tl->slots[slot_id].ca_hndl == -1) { + tl->error = EN50221ERR_BADSLOTID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (connection_id >= tl->max_connections_per_slot) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCONNECTIONID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (tl->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) { + tl->error = EN50221ERR_BADCONNECTIONID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // allocate msg structure + struct en50221_message *msg = + malloc(sizeof(struct en50221_message) + data_size + 10); + if (msg == NULL) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFMEMORY; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // make up data to send + int length_field_len; + msg->data[0] = T_DATA_LAST; + if ((length_field_len = asn_1_encode(data_size + 1, msg->data + 1, 3)) < 0) { + free(msg); + tl->error_slot = slot_id; + tl->error = EN50221ERR_ASNENCODE; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + msg->data[1 + length_field_len] = connection_id; + memcpy(msg->data + 1 + length_field_len + 1, data, data_size); + msg->length = 1 + length_field_len + 1 + data_size; + + // queue it for transmission + queue_message(tl, slot_id, connection_id, msg); + + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return 0; +} + +int en50221_tl_send_datav(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + struct iovec *vector, int iov_count) +{ +#ifdef DEBUG_TXDATA + printf("[[[[[[[[[[[[[[[[[[[[\n"); + uint32_t ii = 0; + uint32_t iipos = 0; + for (ii = 0; ii < (uint32_t) iov_count; ii++) { + uint32_t jj; + for (jj = 0; jj < vector[ii].iov_len; jj++) { + printf("%02x: %02x\n", jj + iipos, + *((uint8_t *) (vector[ii].iov_base) + jj)); + } + iipos += vector[ii].iov_len; + } + printf("]]]]]]]]]]]]]]]]]]]]\n"); +#endif + + if (slot_id >= tl->max_slots) { + tl->error = EN50221ERR_BADSLOTID; + return -1; + } + + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + if (tl->slots[slot_id].ca_hndl == -1) { + tl->error = EN50221ERR_BADSLOTID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (connection_id >= tl->max_connections_per_slot) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCONNECTIONID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (tl->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) { + tl->error = EN50221ERR_BADCONNECTIONID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // calculate the total length of the data to send + uint32_t data_size = 0; + int i; + for (i = 0; i < iov_count; i++) { + data_size += vector[i].iov_len; + } + + // allocate msg structure + struct en50221_message *msg = + malloc(sizeof(struct en50221_message) + data_size + 10); + if (msg == NULL) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFMEMORY; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // make up data to send + int length_field_len; + msg->data[0] = T_DATA_LAST; + if ((length_field_len = asn_1_encode(data_size + 1, msg->data + 1, 3)) < 0) { + free(msg); + tl->error_slot = slot_id; + tl->error = EN50221ERR_ASNENCODE; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + msg->data[1 + length_field_len] = connection_id; + msg->length = 1 + length_field_len + 1 + data_size; + msg->next = NULL; + + // merge the iovecs + uint32_t pos = 1 + length_field_len + 1; + for (i = 0; i < iov_count; i++) { + memcpy(msg->data + pos, vector[i].iov_base, + vector[i].iov_len); + pos += vector[i].iov_len; + } + + // queue it for transmission + queue_message(tl, slot_id, connection_id, msg); + + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return 0; +} + +int en50221_tl_new_tc(struct en50221_transport_layer *tl, uint8_t slot_id) +{ + // check + if (slot_id >= tl->max_slots) { + tl->error = EN50221ERR_BADSLOTID; + return -1; + } + + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + if (tl->slots[slot_id].ca_hndl == -1) { + tl->error = EN50221ERR_BADSLOTID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // allocate a new connection if possible + int conid = en50221_tl_alloc_new_tc(tl, slot_id); + if (conid == -1) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFCONNECTIONS; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // allocate msg structure + struct en50221_message *msg = + malloc(sizeof(struct en50221_message) + 3); + if (msg == NULL) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFMEMORY; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // make up the data to send + msg->data[0] = T_CREATE_T_C; + msg->data[1] = 1; + msg->data[2] = conid; + msg->length = 3; + msg->next = NULL; + + // queue it for transmission + queue_message(tl, slot_id, conid, msg); + + // done + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return conid; +} + +int en50221_tl_del_tc(struct en50221_transport_layer *tl, uint8_t slot_id, + uint8_t connection_id) +{ + // check + if (slot_id >= tl->max_slots) { + tl->error = EN50221ERR_BADSLOTID; + return -1; + } + + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + if (tl->slots[slot_id].ca_hndl == -1) { + tl->error = EN50221ERR_BADSLOTID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (connection_id >= tl->max_connections_per_slot) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCONNECTIONID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (!(tl->slots[slot_id].connections[connection_id].state & + (T_STATE_ACTIVE | T_STATE_IN_DELETION))) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADSTATE; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // allocate msg structure + struct en50221_message *msg = + malloc(sizeof(struct en50221_message) + 3); + if (msg == NULL) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFMEMORY; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + // make up the data to send + msg->data[0] = T_DELETE_T_C; + msg->data[1] = 1; + msg->data[2] = connection_id; + msg->length = 3; + msg->next = NULL; + + // queue it for transmission + queue_message(tl, slot_id, connection_id, msg); + tl->slots[slot_id].connections[connection_id].state = + T_STATE_ACTIVE_DELETEQUEUED; + + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return 0; +} + +int en50221_tl_get_connection_state(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id) +{ + if (slot_id >= tl->max_slots) { + tl->error = EN50221ERR_BADSLOTID; + return -1; + } + + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + if (tl->slots[slot_id].ca_hndl == -1) { + tl->error = EN50221ERR_BADSLOTID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + if (connection_id >= tl->max_connections_per_slot) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCONNECTIONID; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + return -1; + } + int state = tl->slots[slot_id].connections[connection_id].state; + pthread_mutex_unlock(&tl->slots[slot_id].slot_lock); + + return state; +} + + + + +// ask the module for new data +static int en50221_tl_poll_tc(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id) +{ + gettimeofday(&tl->slots[slot_id].connections[connection_id]. + tx_time, 0); + + // send command + uint8_t hdr[3]; + hdr[0] = T_DATA_LAST; + hdr[1] = 1; + hdr[2] = connection_id; + if (dvbca_link_write(tl->slots[slot_id].ca_hndl, + tl->slots[slot_id].slot, + connection_id, hdr, 3) < 0) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + return -1; + } + return 0; +} + +// handle incoming data +static int en50221_tl_process_data(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t * data, + uint32_t data_length) +{ + int result; + +#ifdef DEBUG_RXDATA + printf("-------------------\n"); + uint32_t ii = 0; + for (ii = 0; ii < data_length; ii++) { + printf("%02x: %02x\n", ii, data[ii]); + } + printf("+++++++++++++++++++\n"); +#endif + + // process the received data + while (data_length) { + // parse the header + uint8_t tpdu_tag = data[0]; + uint16_t asn_data_length; + int length_field_len; + if ((length_field_len = asn_1_decode(&asn_data_length, data + 1, data_length - 1)) < 0) { + print(LOG_LEVEL, ERROR, 1, + "Received data with invalid asn from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + if ((asn_data_length < 1) || + (asn_data_length > (data_length - (1 + length_field_len)))) { + print(LOG_LEVEL, ERROR, 1, + "Received data with invalid length from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + uint8_t connection_id = data[1 + length_field_len]; + data += 1 + length_field_len + 1; + data_length -= (1 + length_field_len + 1); + asn_data_length--; + + // check the connection_id + if (connection_id >= tl->max_connections_per_slot) { + print(LOG_LEVEL, ERROR, 1, + "Received bad connection id %02x from module on slot %02x\n", + connection_id, slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCONNECTIONID; + return -1; + } + // process the TPDUs + switch (tpdu_tag) { + case T_C_T_C_REPLY: + if ((result = en50221_tl_handle_create_tc_reply(tl, slot_id, connection_id)) < 0) { + return -1; + } + break; + case T_DELETE_T_C: + if ((result = en50221_tl_handle_delete_tc(tl, slot_id, connection_id)) < 0) { + return -1; + } + break; + case T_D_T_C_REPLY: + if ((result = en50221_tl_handle_delete_tc_reply(tl, slot_id, connection_id)) < 0) { + return -1; + } + break; + case T_REQUEST_T_C: + if ((result = en50221_tl_handle_request_tc(tl, slot_id, connection_id)) < 0) { + return -1; + } + break; + case T_DATA_MORE: + if ((result = en50221_tl_handle_data_more(tl, slot_id, + connection_id, + data, + asn_data_length)) < 0) { + return -1; + } + break; + case T_DATA_LAST: + if ((result = en50221_tl_handle_data_last(tl, slot_id, + connection_id, + data, + asn_data_length)) < 0) { + return -1; + } + break; + case T_SB: + if ((result = en50221_tl_handle_sb(tl, slot_id, + connection_id, + data, + asn_data_length)) < 0) { + return -1; + } + break; + default: + print(LOG_LEVEL, ERROR, 1, + "Recieved unexpected TPDU tag %02x from module on slot %02x\n", + tpdu_tag, slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + + // skip over the consumed data + data += asn_data_length; + data_length -= asn_data_length; + } + + return 0; +} + +static int en50221_tl_handle_create_tc_reply(struct en50221_transport_layer + *tl, uint8_t slot_id, + uint8_t connection_id) +{ + // set this connection to state active + if (tl->slots[slot_id].connections[connection_id].state == T_STATE_IN_CREATION) { + tl->slots[slot_id].connections[connection_id].state = T_STATE_ACTIVE; + tl->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0; + + // tell upper layers + pthread_mutex_lock(&tl->setcallback_lock); + en50221_tl_callback cb = tl->callback; + void *cb_arg = tl->callback_arg; + pthread_mutex_unlock(&tl->setcallback_lock); + if (cb) + cb(cb_arg, T_CALLBACK_REASON_CONNECTIONOPEN, NULL, 0, slot_id, connection_id); + } else { + print(LOG_LEVEL, ERROR, 1, + "Received T_C_T_C_REPLY for connection not in " + "T_STATE_IN_CREATION from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + + return 0; +} + +static int en50221_tl_handle_delete_tc(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id) +{ + // immediately delete this connection and send D_T_C_REPLY + if (tl->slots[slot_id].connections[connection_id].state & + (T_STATE_ACTIVE | T_STATE_IN_DELETION)) { + // clear down the slot + tl->slots[slot_id].connections[connection_id].state = T_STATE_IDLE; + if (tl->slots[slot_id].connections[connection_id].chain_buffer) { + free(tl->slots[slot_id].connections[connection_id].chain_buffer); + } + tl->slots[slot_id].connections[connection_id].chain_buffer = NULL; + tl->slots[slot_id].connections[connection_id].buffer_length = 0; + + // send the reply + uint8_t hdr[3]; + hdr[0] = T_D_T_C_REPLY; + hdr[1] = 1; + hdr[2] = connection_id; + if (dvbca_link_write(tl->slots[slot_id].ca_hndl, + tl->slots[slot_id].slot, + connection_id, hdr, 3) < 0) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + return -1; + } + // tell upper layers + pthread_mutex_lock(&tl->setcallback_lock); + en50221_tl_callback cb = tl->callback; + void *cb_arg = tl->callback_arg; + pthread_mutex_unlock(&tl->setcallback_lock); + if (cb) + cb(cb_arg, T_CALLBACK_REASON_CONNECTIONCLOSE, NULL, 0, slot_id, connection_id); + } else { + print(LOG_LEVEL, ERROR, 1, + "Received T_DELETE_T_C for inactive connection from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + + return 0; +} + +static int en50221_tl_handle_delete_tc_reply(struct en50221_transport_layer + *tl, uint8_t slot_id, + uint8_t connection_id) +{ + // delete this connection, should be in T_STATE_IN_DELETION already + if (tl->slots[slot_id].connections[connection_id].state == T_STATE_IN_DELETION) { + tl->slots[slot_id].connections[connection_id].state = T_STATE_IDLE; + } else { + print(LOG_LEVEL, ERROR, 1, + "Received T_D_T_C_REPLY received for connection not in " + "T_STATE_IN_DELETION from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + + return 0; +} + +static int en50221_tl_handle_request_tc(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id) +{ + // allocate a new connection if possible + int conid = en50221_tl_alloc_new_tc(tl, slot_id); + int ca_hndl = tl->slots[slot_id].ca_hndl; + if (conid == -1) { + print(LOG_LEVEL, ERROR, 1, + "Too many connections requested by module on slot %02x\n", + slot_id); + + // send the error + uint8_t hdr[4]; + hdr[0] = T_T_C_ERROR; + hdr[1] = 2; + hdr[2] = connection_id; + hdr[3] = 1; + if (dvbca_link_write(ca_hndl, tl->slots[slot_id].slot, connection_id, hdr, 4) < 0) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + return -1; + } + tl->slots[slot_id].connections[connection_id].tx_time. + tv_sec = 0; + } else { + // send the NEW_T_C on the connection we received it on + uint8_t hdr[4]; + hdr[0] = T_NEW_T_C; + hdr[1] = 2; + hdr[2] = connection_id; + hdr[3] = conid; + if (dvbca_link_write(ca_hndl, tl->slots[slot_id].slot, connection_id, hdr, 4) < 0) { + tl->slots[slot_id].connections[conid].state = T_STATE_IDLE; + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + return -1; + } + tl->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0; + + // send the CREATE_T_C on the new connnection + hdr[0] = T_CREATE_T_C; + hdr[1] = 1; + hdr[2] = conid; + if (dvbca_link_write(ca_hndl, tl->slots[slot_id].slot, conid, hdr, 3) < 0) { + tl->slots[slot_id].connections[conid].state = T_STATE_IDLE; + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + return -1; + } + gettimeofday(&tl->slots[slot_id].connections[conid].tx_time, 0); + + // tell upper layers + pthread_mutex_lock(&tl->setcallback_lock); + en50221_tl_callback cb = tl->callback; + void *cb_arg = tl->callback_arg; + pthread_mutex_unlock(&tl->setcallback_lock); + if (cb) + cb(cb_arg, T_CALLBACK_REASON_CAMCONNECTIONOPEN, NULL, 0, slot_id, conid); + } + + return 0; +} + +static int en50221_tl_handle_data_more(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id, + uint8_t * data, + uint32_t data_length) +{ + // connection in correct state? + if (tl->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) { + print(LOG_LEVEL, ERROR, 1, + "Received T_DATA_MORE for connection not in " + "T_STATE_ACTIVE from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + // a chained data packet is coming in, save + // it to the buffer and wait for more + tl->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0; + int new_data_length = + tl->slots[slot_id].connections[connection_id].buffer_length + data_length; + uint8_t *new_data_buffer = + realloc(tl->slots[slot_id].connections[connection_id].chain_buffer, new_data_length); + if (new_data_buffer == NULL) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFMEMORY; + return -1; + } + tl->slots[slot_id].connections[connection_id].chain_buffer = new_data_buffer; + + memcpy(tl->slots[slot_id].connections[connection_id].chain_buffer + + tl->slots[slot_id].connections[connection_id].buffer_length, + data, data_length); + tl->slots[slot_id].connections[connection_id].buffer_length = new_data_length; + + return 0; +} + +static int en50221_tl_handle_data_last(struct en50221_transport_layer *tl, + uint8_t slot_id, + uint8_t connection_id, + uint8_t * data, + uint32_t data_length) +{ + // connection in correct state? + if (tl->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) { + print(LOG_LEVEL, ERROR, 1, + "Received T_DATA_LAST received for connection not in " + "T_STATE_ACTIVE from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + // last package of a chain or single package comes in + tl->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0; + if (tl->slots[slot_id].connections[connection_id].chain_buffer == NULL) { + // single package => dispatch immediately + pthread_mutex_lock(&tl->setcallback_lock); + en50221_tl_callback cb = tl->callback; + void *cb_arg = tl->callback_arg; + pthread_mutex_unlock(&tl->setcallback_lock); + + if (cb && data_length) { + pthread_mutex_unlock(&tl->slots[slot_id]. + slot_lock); + cb(cb_arg, T_CALLBACK_REASON_DATA, data, data_length, slot_id, connection_id); + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + } + } else { + int new_data_length = + tl->slots[slot_id].connections[connection_id].buffer_length + data_length; + uint8_t *new_data_buffer = + realloc(tl->slots[slot_id].connections[connection_id].chain_buffer, new_data_length); + if (new_data_buffer == NULL) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_OUTOFMEMORY; + return -1; + } + + memcpy(new_data_buffer + + tl->slots[slot_id].connections[connection_id]. + buffer_length, data, data_length); + + // clean the buffer position + tl->slots[slot_id].connections[connection_id].chain_buffer = NULL; + tl->slots[slot_id].connections[connection_id].buffer_length = 0; + + // tell the upper layers + pthread_mutex_lock(&tl->setcallback_lock); + en50221_tl_callback cb = tl->callback; + void *cb_arg = tl->callback_arg; + pthread_mutex_unlock(&tl->setcallback_lock); + if (cb && data_length) { + pthread_mutex_unlock(&tl->slots[slot_id]. + slot_lock); + cb(cb_arg, T_CALLBACK_REASON_DATA, new_data_buffer, + new_data_length, slot_id, connection_id); + pthread_mutex_lock(&tl->slots[slot_id].slot_lock); + } + + free(new_data_buffer); + } + + return 0; +} + +static int en50221_tl_handle_sb(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + uint8_t * data, uint32_t data_length) +{ + // is the connection id ok? + if (tl->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) { + print(LOG_LEVEL, ERROR, 1, + "Received T_SB for connection not in T_STATE_ACTIVE from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + // did we get enough data in the T_SB? + if (data_length != 1) { + print(LOG_LEVEL, ERROR, 1, + "Recieved T_SB with invalid length from module on slot %02x\n", + slot_id); + tl->error_slot = slot_id; + tl->error = EN50221ERR_BADCAMDATA; + return -1; + } + // tell it to send the data if it says there is some + if (data[0] & 0x80) { + int ca_hndl = tl->slots[slot_id].ca_hndl; + + // send the RCV + uint8_t hdr[3]; + hdr[0] = T_RCV; + hdr[1] = 1; + hdr[2] = connection_id; + if (dvbca_link_write(ca_hndl, tl->slots[slot_id].slot, connection_id, hdr, 3) < 0) { + tl->error_slot = slot_id; + tl->error = EN50221ERR_CAWRITE; + return -1; + } + gettimeofday(&tl->slots[slot_id].connections[connection_id].tx_time, 0); + + } else { + // no data - indicate not waiting for anything now + tl->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0; + } + + return 0; +} + +static int en50221_tl_alloc_new_tc(struct en50221_transport_layer *tl, + uint8_t slot_id) +{ + // we browse through the array of connection + // types, to look for the first unused one + int i, conid = -1; + for (i = 1; i < tl->max_connections_per_slot; i++) { + if (tl->slots[slot_id].connections[i].state == T_STATE_IDLE) { + conid = i; + break; + } + } + if (conid == -1) { + print(LOG_LEVEL, ERROR, 1, + "CREATE_T_C failed: no more connections available\n"); + return -1; + } + // set up the connection struct + tl->slots[slot_id].connections[conid].state = T_STATE_IN_CREATION; + tl->slots[slot_id].connections[conid].chain_buffer = NULL; + tl->slots[slot_id].connections[conid].buffer_length = 0; + + return conid; +} + +static void queue_message(struct en50221_transport_layer *tl, + uint8_t slot_id, uint8_t connection_id, + struct en50221_message *msg) +{ + msg->next = NULL; + if (tl->slots[slot_id].connections[connection_id].send_queue_tail) { + tl->slots[slot_id].connections[connection_id].send_queue_tail->next = msg; + tl->slots[slot_id].connections[connection_id].send_queue_tail = msg; + } else { + tl->slots[slot_id].connections[connection_id].send_queue = msg; + tl->slots[slot_id].connections[connection_id].send_queue_tail = msg; + } +} |