/** Process a 'relay' or 'relay_early' <b>cell</b> that just arrived from
* <b>conn</b>. Make sure it came in with a recognized circ_id. Pass it on to
* circuit_receive_relay_cell() for actual processing.
*/
static void
command_process_relay_cell(cell_t *cell, or_connection_t *conn)
{
circuit_t *circ;
int reason, direction;
circ = circuit_get_by_circid_orconn(cell->circ_id, conn);
if (!circ) {
log_debug(LD_OR,
"unknown circuit %d on connection from %s:%d. Dropping.",
cell->circ_id, conn->_base.address, conn->_base.port);
return;
}
if (circ->state == CIRCUIT_STATE_ONIONSKIN_PENDING) {
log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,"circuit in create_wait. Closing.");
circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
return;
}
if (CIRCUIT_IS_ORIGIN(circ)) {
/* if we're a relay and treating connections with recent local
* traffic better, then this is one of them. */
conn->client_used = time(NULL);
}
if (!CIRCUIT_IS_ORIGIN(circ) &&
cell->circ_id == TO_OR_CIRCUIT(circ)->p_circ_id)
direction = CELL_DIRECTION_OUT;
else
direction = CELL_DIRECTION_IN;
/* If we have a relay_early cell, make sure that it's outbound, and we've
* gotten no more than MAX_RELAY_EARLY_CELLS_PER_CIRCUIT of them. */
if (cell->command == CELL_RELAY_EARLY) {
if (direction == CELL_DIRECTION_IN) {
/* XXX Allow an unlimited number of inbound relay_early cells for
* now, for hidden service compatibility. See bug 1038. -RD */
} else {
or_circuit_t *or_circ = TO_OR_CIRCUIT(circ);
if (or_circ->remaining_relay_early_cells == 0) {
log_fn(LOG_PROTOCOL_WARN, LD_OR,
"Received too many RELAY_EARLY cells on circ %d from %s:%d."
" Closing circuit.",
cell->circ_id, safe_str(conn->_base.address), conn->_base.port);
circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
return;
}
--or_circ->remaining_relay_early_cells;
}
}
if ((reason = circuit_receive_relay_cell(cell, circ, direction)) < 0) {
log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,"circuit_receive_relay_cell "
"(%s) failed. Closing.",
direction==CELL_DIRECTION_OUT?"forward":"backward");
circuit_mark_for_close(circ, -reason);
}
}
/** Process a 'relay' or 'relay_early' <b>cell</b> that just arrived from
* <b>conn</b>. Make sure it came in with a recognized circ_id. Pass it on to
* circuit_receive_relay_cell() for actual processing.
*/
static void
command_process_relay_cell(cell_t *cell, channel_t *chan)
{
circuit_t *circ;
int reason, direction;
circ = circuit_get_by_circid_channel(cell->circ_id, chan);
if (!circ) {
log_debug(LD_OR,
"unknown circuit %u on connection from %s. Dropping.",
(unsigned)cell->circ_id,
channel_get_canonical_remote_descr(chan));
return;
}
if (circ->state == CIRCUIT_STATE_ONIONSKIN_PENDING) {
log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,"circuit in create_wait. Closing.");
circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
return;
}
if (CIRCUIT_IS_ORIGIN(circ)) {
/* if we're a relay and treating connections with recent local
* traffic better, then this is one of them. */
channel_timestamp_client(chan);
}
if (!CIRCUIT_IS_ORIGIN(circ) &&
cell->circ_id == TO_OR_CIRCUIT(circ)->p_circ_id)
direction = CELL_DIRECTION_OUT;
else
direction = CELL_DIRECTION_IN;
/* If we have a relay_early cell, make sure that it's outbound, and we've
* gotten no more than MAX_RELAY_EARLY_CELLS_PER_CIRCUIT of them. */
if (cell->command == CELL_RELAY_EARLY) {
if (direction == CELL_DIRECTION_IN) {
/* Allow an unlimited number of inbound relay_early cells,
* for hidden service compatibility. There isn't any way to make
* a long circuit through inbound relay_early cells anyway. See
* bug 1038. -RD */
} else {
or_circuit_t *or_circ = TO_OR_CIRCUIT(circ);
if (or_circ->remaining_relay_early_cells == 0) {
log_fn(LOG_PROTOCOL_WARN, LD_OR,
"Received too many RELAY_EARLY cells on circ %u from %s."
" Closing circuit.",
(unsigned)cell->circ_id,
safe_str(channel_get_canonical_remote_descr(chan)));
circuit_mark_for_close(circ, END_CIRC_REASON_TORPROTOCOL);
return;
}
--or_circ->remaining_relay_early_cells;
}
}
if ((reason = circuit_receive_relay_cell(cell, circ, direction)) < 0) {
log_fn(LOG_PROTOCOL_WARN,LD_PROTOCOL,"circuit_receive_relay_cell "
"(%s) failed. Closing.",
direction==CELL_DIRECTION_OUT?"forward":"backward");
circuit_mark_for_close(circ, -reason);
}
}
