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kaffeine/kaffeine/src/input/dvb/lib/libdvben50221/en50221_transport.c

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/*
en50221 encoder An implementation for libdvb
an implementation for the en50221 transport layer
Copyright (C) 2004, 2005 Manu Abraham (manu@kromtek.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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_private
{
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_private *tl, uint8_t slot_id,
uint8_t *data, uint32_t data_length);
static int en50221_tl_poll_tc(struct en50221_transport_layer_private *tl, uint8_t slot_id, uint8_t connection_id);
static int en50221_tl_alloc_new_tc(struct en50221_transport_layer_private *tl, uint8_t slot_id);
static void queue_message(struct en50221_transport_layer_private *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_private *private,
uint8_t slot_id, uint8_t connection_id);
static int en50221_tl_handle_delete_tc(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id);
static int en50221_tl_handle_delete_tc_reply(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id);
static int en50221_tl_handle_request_tc(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id);
static int en50221_tl_handle_data_more(struct en50221_transport_layer_private *private,
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_private *private,
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_private *private,
uint8_t slot_id, uint8_t connection_id,
uint8_t *data, uint32_t data_length);
en50221_transport_layer en50221_tl_create(uint8_t max_slots, uint8_t max_connections_per_slot)
{
struct en50221_transport_layer_private *private = NULL;
int i;
int j;
// setup structure
private = (struct en50221_transport_layer_private*) malloc(sizeof(struct en50221_transport_layer_private));
if (private == NULL)
goto error_exit;
private->max_slots = max_slots;
private->max_connections_per_slot = max_connections_per_slot;
private->slots = NULL;
private->slot_pollfds = NULL;
private->slots_changed = 1;
private->callback = NULL;
private->callback_arg = NULL;
private->error_slot = 0;
private->error = 0;
pthread_mutex_init(&private->global_lock, NULL);
pthread_mutex_init(&private->setcallback_lock, NULL);
// create the slots
private->slots = malloc(sizeof(struct en50221_slot) * max_slots);
if (private->slots == NULL)
goto error_exit;
// set them up
for(i=0; i< max_slots; i++) {
private->slots[i].ca_hndl = -1;
// create the connections for this slot
private->slots[i].connections = malloc(sizeof(struct en50221_connection) * max_connections_per_slot);
if (private->slots[i].connections == NULL)
goto error_exit;
// create a mutex for the slot
pthread_mutex_init(&private->slots[i].slot_lock, NULL);
// set them up
for(j = 0; j < max_connections_per_slot; j++) {
private->slots[i].connections[j].state = T_STATE_IDLE;
private->slots[i].connections[j].tx_time.tv_sec = 0;
private->slots[i].connections[j].last_poll_time.tv_sec = 0;
private->slots[i].connections[j].last_poll_time.tv_usec = 0;
private->slots[i].connections[j].chain_buffer = NULL;
private->slots[i].connections[j].buffer_length = 0;
private->slots[i].connections[j].send_queue = NULL;
private->slots[i].connections[j].send_queue_tail = NULL;
}
}
// create the pollfds
private->slot_pollfds = malloc(sizeof(struct pollfd) * max_slots);
if (private->slot_pollfds == NULL) {
goto error_exit;
}
memset(private->slot_pollfds, 0, sizeof(struct pollfd) * max_slots);
return private;
error_exit:
en50221_tl_destroy(private);
return NULL;
}
// Destroy an instance of the transport layer
void en50221_tl_destroy(en50221_transport_layer tl)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
int i, j;
if (private) {
if (private->slots) {
for(i=0; i< private->max_slots; i++) {
if (private->slots[i].connections) {
for(j=0; j<private->max_connections_per_slot; j++) {
if (private->slots[i].connections[j].chain_buffer) {
free(private->slots[i].connections[j].chain_buffer);
}
struct en50221_message *cur_msg = private->slots[i].connections[j].send_queue;
while(cur_msg) {
struct en50221_message *next_msg = cur_msg->next;
free(cur_msg);
cur_msg = next_msg;
}
private->slots[i].connections[j].send_queue = NULL;
private->slots[i].connections[j].send_queue_tail = NULL;
}
free(private->slots[i].connections);
pthread_mutex_destroy(&private->slots[i].slot_lock);
}
}
free(private->slots);
}
if (private->slot_pollfds) {
free(private->slot_pollfds);
}
pthread_mutex_destroy(&private->setcallback_lock);
pthread_mutex_destroy(&private->global_lock);
free(private);
}
}
// this can be called from the user-space app to
// register new slots that we should work with
int en50221_tl_register_slot(en50221_transport_layer tl, int ca_hndl, uint8_t slot,
uint32_t response_timeout, uint32_t poll_delay)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
// lock
pthread_mutex_lock(&private->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 < private->max_slots; i++) {
if (private->slots[i].ca_hndl == -1) {
slot_id = i;
break;
}
}
if (slot_id == -1) {
private->error = EN50221ERR_OUTOFSLOTS;
pthread_mutex_unlock(&private->global_lock);
return -1;
}
// set up the slot struct
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
private->slots[slot_id].ca_hndl = ca_hndl;
private->slots[slot_id].slot = slot;
private->slots[slot_id].response_timeout = response_timeout;
private->slots[slot_id].poll_delay = poll_delay;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
private->slots_changed = 1;
pthread_mutex_unlock(&private->global_lock);
return slot_id;
}
void en50221_tl_destroy_slot(en50221_transport_layer tl, uint8_t slot_id)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
int i;
if (slot_id >= private->max_slots)
return;
// lock
pthread_mutex_lock(&private->global_lock);
// clear the slot
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
private->slots[slot_id].ca_hndl = -1;
for(i=0; i<private->max_connections_per_slot; i++) {
private->slots[slot_id].connections[i].state = T_STATE_IDLE;
private->slots[slot_id].connections[i].tx_time.tv_sec = 0;
private->slots[slot_id].connections[i].last_poll_time.tv_sec = 0;
private->slots[slot_id].connections[i].last_poll_time.tv_usec = 0;
if (private->slots[slot_id].connections[i].chain_buffer) {
free(private->slots[slot_id].connections[i].chain_buffer);
}
private->slots[slot_id].connections[i].chain_buffer = NULL;
private->slots[slot_id].connections[i].buffer_length = 0;
struct en50221_message *cur_msg = private->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;
}
private->slots[slot_id].connections[i].send_queue = NULL;
private->slots[slot_id].connections[i].send_queue_tail = NULL;
}
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
// tell upper layers
pthread_mutex_lock(&private->setcallback_lock);
en50221_tl_callback cb = private->callback;
void *cb_arg = private->callback_arg;
pthread_mutex_unlock(&private->setcallback_lock);
if (cb)
cb(cb_arg, T_CALLBACK_REASON_SLOTCLOSE, NULL, 0, slot_id, 0);
private->slots_changed = 1;
pthread_mutex_unlock(&private->global_lock);
}
int en50221_tl_poll(en50221_transport_layer tl)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
uint8_t data[4096];
int slot_id;
int j;
// make up pollfds if the slots have changed
pthread_mutex_lock(&private->global_lock);
if (private->slots_changed) {
for(slot_id = 0; slot_id < private->max_slots; slot_id++) {
if (private->slots[slot_id].ca_hndl != -1) {
private->slot_pollfds[slot_id].fd = private->slots[slot_id].ca_hndl;
private->slot_pollfds[slot_id].events = POLLIN|POLLPRI|POLLERR;
private->slot_pollfds[slot_id].revents = 0;
} else {
private->slot_pollfds[slot_id].fd = 0;
private->slot_pollfds[slot_id].events = 0;
private->slot_pollfds[slot_id].revents = 0;
}
}
private->slots_changed = 0;
}
pthread_mutex_unlock(&private->global_lock);
// anything happened?
if (poll(private->slot_pollfds, private->max_slots, 10) < 0) {
private->error_slot = -1;
private->error = EN50221ERR_CAREAD;
return -1;
}
// go through all slots (even though poll may not have reported any events
for(slot_id = 0; slot_id < private->max_slots; slot_id++) {
// check if this slot is still used and get its handle
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
if (private->slots[slot_id].ca_hndl == -1) {
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
continue;
}
int ca_hndl = private->slots[slot_id].ca_hndl;
if (private->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) {
private->error_slot = slot_id;
private->error = EN50221ERR_CAREAD;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
// process it if we got some
if (readcnt > 0) {
if (private->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 < private->max_slots; new_slot_id++) {
if ((private->slots[new_slot_id].ca_hndl == ca_hndl) && (private->slots[new_slot_id].slot == r_slot_id))
break;
}
if (new_slot_id != private->max_slots) {
// we found the requested CAM
pthread_mutex_lock(&private->slots[new_slot_id].slot_lock);
if (en50221_tl_process_data(private, new_slot_id, data, readcnt)) {
pthread_mutex_unlock(&private->slots[new_slot_id].slot_lock);
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
pthread_mutex_unlock(&private->slots[new_slot_id].slot_lock);
} else {
private->error = EN50221ERR_BADSLOTID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
}
else if (en50221_tl_process_data(private, slot_id, data, readcnt)) {
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
}
} else if (private->slot_pollfds[slot_id].revents & POLLERR) {
// an error was reported
private->error_slot = slot_id;
private->error = EN50221ERR_CAREAD;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
// poll the connections on this slot + check for timeouts
for(j=0; j < private->max_connections_per_slot; j++) {
// ignore connection if idle
if (private->slots[slot_id].connections[j].state == T_STATE_IDLE) {
continue;
}
// send queued data
if (private->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 (private->slots[slot_id].connections[j].send_queue &&
(private->slots[slot_id].connections[j].tx_time.tv_sec == 0)) {
// get the message
struct en50221_message *msg = private->slots[slot_id].connections[j].send_queue;
if (msg->next != NULL) {
private->slots[slot_id].connections[j].send_queue = msg->next;
} else {
private->slots[slot_id].connections[j].send_queue = NULL;
private->slots[slot_id].connections[j].send_queue_tail = NULL;
}
// send the message
if (dvbca_link_write(private->slots[slot_id].ca_hndl, private->slots[slot_id].slot, j, msg->data, msg->length) < 0) {
free(msg);
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
print(LOG_LEVEL, ERROR, 1, "CAWrite failed");
return -1;
}
gettimeofday(&private->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)) {
private->slots[slot_id].connections[j].state = T_STATE_IN_DELETION;
if (private->slots[slot_id].connections[j].chain_buffer) {
free(private->slots[slot_id].connections[j].chain_buffer);
}
private->slots[slot_id].connections[j].chain_buffer = NULL;
private->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 (private->slots[slot_id].connections[j].state & T_STATE_ACTIVE) {
if ((private->slots[slot_id].connections[j].tx_time.tv_sec == 0) &&
(time_after(private->slots[slot_id].connections[j].last_poll_time, private->slots[slot_id].poll_delay))) {
gettimeofday(&private->slots[slot_id].connections[j].last_poll_time, 0);
if (en50221_tl_poll_tc(private, slot_id, j)) {
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
}
}
// check for timeouts - in any state
if (private->slots[slot_id].connections[j].tx_time.tv_sec &&
(time_after(private->slots[slot_id].connections[j].tx_time, private->slots[slot_id].response_timeout))) {
if (private->slots[slot_id].connections[j].state & (T_STATE_IN_CREATION|T_STATE_IN_DELETION)) {
private->slots[slot_id].connections[j].state = T_STATE_IDLE;
} else if (private->slots[slot_id].connections[j].state & (T_STATE_ACTIVE|T_STATE_ACTIVE_DELETEQUEUED)) {
private->error_slot = slot_id;
private->error = EN50221ERR_TIMEOUT;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
}
}
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
}
return 0;
}
void en50221_tl_register_callback(en50221_transport_layer tl, en50221_tl_callback callback, void *arg)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
pthread_mutex_lock(&private->setcallback_lock);
private->callback = callback;
private->callback_arg = arg;
pthread_mutex_unlock(&private->setcallback_lock);
}
int en50221_tl_get_error_slot(en50221_transport_layer tl)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
return private->error_slot;
}
int en50221_tl_get_error(en50221_transport_layer tl)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
return private->error;
}
int en50221_tl_send_data(en50221_transport_layer tl, uint8_t slot_id, uint8_t connection_id,
uint8_t *data, uint32_t data_size)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
#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 >= private->max_slots) {
private->error = EN50221ERR_BADSLOTID;
return -1;
}
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
if (private->slots[slot_id].ca_hndl == -1) {
private->error = EN50221ERR_BADSLOTID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (connection_id >= private->max_connections_per_slot) {
private->error_slot = slot_id;
private->error = EN50221ERR_BADCONNECTIONID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (private->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) {
private->error = EN50221ERR_BADCONNECTIONID;
pthread_mutex_unlock(&private->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) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFMEMORY;
pthread_mutex_unlock(&private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_ASNENCODE;
pthread_mutex_unlock(&private->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(private, slot_id, connection_id, msg);
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return 0;
}
int en50221_tl_send_datav(en50221_transport_layer tl, uint8_t slot_id, uint8_t connection_id,
struct iovec *vector, int iov_count)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
#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 >= private->max_slots) {
private->error = EN50221ERR_BADSLOTID;
return -1;
}
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
if (private->slots[slot_id].ca_hndl == -1) {
private->error = EN50221ERR_BADSLOTID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (connection_id >= private->max_connections_per_slot) {
private->error_slot = slot_id;
private->error = EN50221ERR_BADCONNECTIONID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (private->slots[slot_id].connections[connection_id].state != T_STATE_ACTIVE) {
private->error = EN50221ERR_BADCONNECTIONID;
pthread_mutex_unlock(&private->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) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFMEMORY;
pthread_mutex_unlock(&private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_ASNENCODE;
pthread_mutex_unlock(&private->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(private, slot_id, connection_id, msg);
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return 0;
}
int en50221_tl_new_tc(en50221_transport_layer tl, uint8_t slot_id)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
// check
if (slot_id >= private->max_slots) {
private->error = EN50221ERR_BADSLOTID;
return -1;
}
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
if (private->slots[slot_id].ca_hndl == -1) {
private->error = EN50221ERR_BADSLOTID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
// allocate a new connection if possible
int conid = en50221_tl_alloc_new_tc(private, slot_id);
if (conid == -1) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFCONNECTIONS;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
// allocate msg structure
struct en50221_message *msg = malloc(sizeof(struct en50221_message)+3);
if (msg == NULL) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFMEMORY;
pthread_mutex_unlock(&private->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(private, slot_id, conid, msg);
// done
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return conid;
}
int en50221_tl_del_tc(en50221_transport_layer tl, uint8_t slot_id, uint8_t connection_id)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
// check
if (slot_id >= private->max_slots) {
private->error = EN50221ERR_BADSLOTID;
return -1;
}
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
if (private->slots[slot_id].ca_hndl == -1) {
private->error = EN50221ERR_BADSLOTID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (connection_id >= private->max_connections_per_slot) {
private->error_slot = slot_id;
private->error = EN50221ERR_BADCONNECTIONID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (!(private->slots[slot_id].connections[connection_id].state &
(T_STATE_ACTIVE|T_STATE_IN_DELETION))) {
private->error_slot = slot_id;
private->error = EN50221ERR_BADSTATE;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
// allocate msg structure
struct en50221_message *msg = malloc(sizeof(struct en50221_message)+3);
if (msg == NULL) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFMEMORY;
pthread_mutex_unlock(&private->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(private, slot_id, connection_id, msg);
private->slots[slot_id].connections[connection_id].state = T_STATE_ACTIVE_DELETEQUEUED;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return 0;
}
int en50221_tl_get_connection_state(en50221_transport_layer tl,
uint8_t slot_id, uint8_t connection_id)
{
struct en50221_transport_layer_private *private = (struct en50221_transport_layer_private *) tl;
if (slot_id >= private->max_slots) {
private->error = EN50221ERR_BADSLOTID;
return -1;
}
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
if (private->slots[slot_id].ca_hndl == -1) {
private->error = EN50221ERR_BADSLOTID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
if (connection_id >= private->max_connections_per_slot) {
private->error_slot = slot_id;
private->error = EN50221ERR_BADCONNECTIONID;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return -1;
}
int state = private->slots[slot_id].connections[connection_id].state;
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
return state;
}
// ask the module for new data
static int en50221_tl_poll_tc(struct en50221_transport_layer_private *private, uint8_t slot_id, uint8_t connection_id)
{
gettimeofday(&private->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(private->slots[slot_id].ca_hndl, private->slots[slot_id].slot, connection_id, hdr, 3) < 0) {
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
return -1;
}
return 0;
}
// handle incoming data
static int en50221_tl_process_data(struct en50221_transport_layer_private *private, 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);
private->error_slot = slot_id;
private->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);
private->error_slot = slot_id;
private->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 >= private->max_connections_per_slot) {
print(LOG_LEVEL, ERROR, 1, "Received bad connection id %02x from module on slot %02x\n", connection_id, slot_id);
private->error_slot = slot_id;
private->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(private, slot_id, connection_id)) < 0) {
return -1;
}
break;
case T_DELETE_T_C:
if ((result = en50221_tl_handle_delete_tc(private, slot_id, connection_id)) < 0) {
return -1;
}
break;
case T_D_T_C_REPLY:
if ((result = en50221_tl_handle_delete_tc_reply(private, slot_id, connection_id)) < 0) {
return -1;
}
break;
case T_REQUEST_T_C:
if ((result = en50221_tl_handle_request_tc(private, slot_id, connection_id)) < 0) {
return -1;
}
break;
case T_DATA_MORE:
if ((result = en50221_tl_handle_data_more(private, slot_id, connection_id, data, asn_data_length)) < 0) {
return -1;
}
break;
case T_DATA_LAST:
if ((result = en50221_tl_handle_data_last(private, slot_id, connection_id, data, asn_data_length)) < 0) {
return -1;
}
break;
case T_SB:
if ((result = en50221_tl_handle_sb(private, 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);
private->error_slot = slot_id;
private->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_private *private,
uint8_t slot_id, uint8_t connection_id)
{
// set this connection to state active
if (private->slots[slot_id].connections[connection_id].state == T_STATE_IN_CREATION) {
private->slots[slot_id].connections[connection_id].state = T_STATE_ACTIVE;
private->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0;
// tell upper layers
pthread_mutex_lock(&private->setcallback_lock);
en50221_tl_callback cb = private->callback;
void *cb_arg = private->callback_arg;
pthread_mutex_unlock(&private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_BADCAMDATA;
return -1;
}
return 0;
}
static int en50221_tl_handle_delete_tc(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id)
{
// immediately delete this connection and send D_T_C_REPLY
if (private->slots[slot_id].connections[connection_id].state & (T_STATE_ACTIVE|T_STATE_IN_DELETION))
{
// clear down the slot
private->slots[slot_id].connections[connection_id].state = T_STATE_IDLE;
if (private->slots[slot_id].connections[connection_id].chain_buffer) {
free(private->slots[slot_id].connections[connection_id].chain_buffer);
}
private->slots[slot_id].connections[connection_id].chain_buffer = NULL;
private->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(private->slots[slot_id].ca_hndl, private->slots[slot_id].slot, connection_id, hdr, 3) < 0) {
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
return -1;
}
// tell upper layers
pthread_mutex_lock(&private->setcallback_lock);
en50221_tl_callback cb = private->callback;
void *cb_arg = private->callback_arg;
pthread_mutex_unlock(&private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_BADCAMDATA;
return -1;
}
return 0;
}
static int en50221_tl_handle_delete_tc_reply(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id)
{
// delete this connection, should be in T_STATE_IN_DELETION already
if (private->slots[slot_id].connections[connection_id].state == T_STATE_IN_DELETION) {
private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_BADCAMDATA;
return -1;
}
return 0;
}
static int en50221_tl_handle_request_tc(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id)
{
// allocate a new connection if possible
int conid = en50221_tl_alloc_new_tc(private, slot_id);
int ca_hndl = private->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, private->slots[slot_id].slot, connection_id, hdr, 4) < 0) {
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
return -1;
}
private->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, private->slots[slot_id].slot, connection_id, hdr, 4) < 0) {
private->slots[slot_id].connections[conid].state = T_STATE_IDLE;
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
return -1;
}
private->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, private->slots[slot_id].slot, conid, hdr, 3) < 0) {
private->slots[slot_id].connections[conid].state = T_STATE_IDLE;
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
return -1;
}
gettimeofday(&private->slots[slot_id].connections[conid].tx_time, 0);
// tell upper layers
pthread_mutex_lock(&private->setcallback_lock);
en50221_tl_callback cb = private->callback;
void *cb_arg = private->callback_arg;
pthread_mutex_unlock(&private->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_private *private,
uint8_t slot_id, uint8_t connection_id,
uint8_t *data, uint32_t data_length)
{
// connection in correct state?
if (private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_BADCAMDATA;
return -1;
}
// a chained data packet is coming in, save
// it to the buffer and wait for more
private->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0;
int new_data_length =
private->slots[slot_id].connections[connection_id].buffer_length + data_length;
uint8_t *new_data_buffer =
realloc(private->slots[slot_id].connections[connection_id].chain_buffer, new_data_length);
if (new_data_buffer == NULL) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFMEMORY;
return -1;
}
private->slots[slot_id].connections[connection_id].chain_buffer = new_data_buffer;
memcpy(private->slots[slot_id].connections[connection_id].chain_buffer +
private->slots[slot_id].connections[connection_id].buffer_length,
data, data_length);
private->slots[slot_id].connections[connection_id].buffer_length = new_data_length;
return 0;
}
static int en50221_tl_handle_data_last(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id,
uint8_t *data, uint32_t data_length)
{
// connection in correct state?
if (private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_BADCAMDATA;
return -1;
}
// last package of a chain or single package comes in
private->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0;
if (private->slots[slot_id].connections[connection_id].chain_buffer == NULL)
{
// single package => dispatch immediately
pthread_mutex_lock(&private->setcallback_lock);
en50221_tl_callback cb = private->callback;
void *cb_arg = private->callback_arg;
pthread_mutex_unlock(&private->setcallback_lock);
if (cb && data_length) {
pthread_mutex_unlock(&private->slots[slot_id].slot_lock);
cb(cb_arg, T_CALLBACK_REASON_DATA, data, data_length, slot_id, connection_id);
pthread_mutex_lock(&private->slots[slot_id].slot_lock);
}
}
else
{
int new_data_length = private->slots[slot_id].connections[connection_id].buffer_length + data_length;
uint8_t *new_data_buffer =
realloc(private->slots[slot_id].connections[connection_id].chain_buffer, new_data_length);
if (new_data_buffer == NULL) {
private->error_slot = slot_id;
private->error = EN50221ERR_OUTOFMEMORY;
return -1;
}
memcpy(new_data_buffer + private->slots[slot_id].connections[connection_id].buffer_length, data, data_length);
// clean the buffer position
private->slots[slot_id].connections[connection_id].chain_buffer = NULL;
private->slots[slot_id].connections[connection_id].buffer_length = 0;
// tell the upper layers
pthread_mutex_lock(&private->setcallback_lock);
en50221_tl_callback cb = private->callback;
void *cb_arg = private->callback_arg;
pthread_mutex_unlock(&private->setcallback_lock);
if (cb && data_length) {
pthread_mutex_unlock(&private->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(&private->slots[slot_id].slot_lock);
}
free(new_data_buffer);
}
return 0;
}
static int en50221_tl_handle_sb(struct en50221_transport_layer_private *private,
uint8_t slot_id, uint8_t connection_id,
uint8_t *data, uint32_t data_length)
{
// is the connection id ok?
if (private->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);
private->error_slot = slot_id;
private->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);
private->error_slot = slot_id;
private->error = EN50221ERR_BADCAMDATA;
return -1;
}
// tell it to send the data if it says there is some
if (data[0] & 0x80) {
int ca_hndl = private->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, private->slots[slot_id].slot, connection_id, hdr, 3) < 0) {
private->error_slot = slot_id;
private->error = EN50221ERR_CAWRITE;
return -1;
}
gettimeofday(&private->slots[slot_id].connections[connection_id].tx_time, 0);
} else {
// no data - indicate not waiting for anything now
private->slots[slot_id].connections[connection_id].tx_time.tv_sec = 0;
}
return 0;
}
static int en50221_tl_alloc_new_tc(struct en50221_transport_layer_private *private, 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 < private->max_connections_per_slot; i++) {
if (private->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
private->slots[slot_id].connections[conid].state = T_STATE_IN_CREATION;
private->slots[slot_id].connections[conid].chain_buffer = NULL;
private->slots[slot_id].connections[conid].buffer_length = 0;
return conid;
}
static void queue_message(struct en50221_transport_layer_private *private, uint8_t slot_id,
uint8_t connection_id, struct en50221_message *msg)
{
msg->next = NULL;
if (private->slots[slot_id].connections[connection_id].send_queue_tail) {
private->slots[slot_id].connections[connection_id].send_queue_tail->next = msg;
} else {
private->slots[slot_id].connections[connection_id].send_queue = msg;
private->slots[slot_id].connections[connection_id].send_queue_tail = msg;
}
}
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