mirrors/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2025-02-24 22:58:50 +01:00
Code Issues Projects Releases Wiki Activity

Circuit padding cell event callbacks.

Browse source 
These callbacks allow the padding state machines to react to various types of
sent and received relay cells.

Co-authored-by: George Kadianakis <desnacked@riseup.net>
This commit is contained in:
Mike Perry 2018-10-23 20:03:35 +00:00 • committed by George Kadianakis
parent 43701e1ebe
commit 7be71903da
2 changed files with 21 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

3
src/core/or/or.h
View file

@ -207,6 +207,9 @@ struct curve25519_public_key_t;
#define RELAY_COMMAND_RENDEZVOUS_ESTABLISHED 39
#define RELAY_COMMAND_INTRODUCE_ACK 40
#define RELAY_COMMAND_PADDING_NEGOTIATE 41
#define RELAY_COMMAND_PADDING_NEGOTIATED 42
/* Reasons why an OR connection is closed. */
#define END_OR_CONN_REASON_DONE 1
#define END_OR_CONN_REASON_REFUSED 2 /* connection refused */

25
src/core/or/relay.c
View file

@ -55,6 +55,7 @@
#include "core/or/circuitbuild.h"
#include "core/or/circuitlist.h"
#include "core/or/circuituse.h"
#include "core/or/circuitpadding.h"
#include "lib/compress/compress.h"
#include "app/config/config.h"
#include "core/mainloop/connection.h"
@ -80,7 +81,6 @@
#include "feature/nodelist/describe.h"
#include "feature/nodelist/routerlist.h"
#include "core/or/scheduler.h"
#include "feature/stats/rephist.h"
#include "core/or/cell_st.h"
#include "core/or/cell_queue_st.h"
@ -293,7 +293,9 @@ circuit_receive_relay_cell(cell_t *cell, circuit_t *circ,
return 0;
}
/* not recognized. pass it on. */
/* not recognized. inform circpad and pass it on. */
circpad_deliver_unrecognized_cell_events(circ, cell_direction);
if (cell_direction == CELL_DIRECTION_OUT) {
cell->circ_id = circ->n_circ_id; /* switch it */
chan = circ->n_chan;
@ -524,6 +526,7 @@ relay_command_to_string(uint8_t command)
case RELAY_COMMAND_INTRODUCE_ACK: return "INTRODUCE_ACK";
case RELAY_COMMAND_EXTEND2: return "EXTEND2";
case RELAY_COMMAND_EXTENDED2: return "EXTENDED2";
case RELAY_COMMAND_PADDING_NEGOTIATE: return "PADDING_NEGOTIATE";
default:
tor_snprintf(buf, sizeof(buf), "Unrecognized relay command %u",
(unsigned)command);
@ -577,8 +580,8 @@ relay_send_command_from_edge_,(streamid_t stream_id, circuit_t *circ,
log_debug(LD_OR,"delivering %d cell %s.", relay_command,
cell_direction == CELL_DIRECTION_OUT ? "forward" : "backward");
if (relay_command == RELAY_COMMAND_DROP)
rep_hist_padding_count_write(PADDING_TYPE_DROP);
/* Tell circpad we're sending a relay cell */
circpad_deliver_sent_relay_cell_events(circ, relay_command);
/* If we are sending an END cell and this circuit is used for a tunneled
* directory request, advance its state. */
@ -1483,9 +1486,11 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
}
}
/* Tell circpad that we've recieved a recognized cell */
circpad_deliver_recognized_relay_cell_events(circ, rh.command, layer_hint);
/* either conn is NULL, in which case we've got a control cell, or else
* conn points to the recognized stream. */
if (conn && !connection_state_is_open(TO_CONN(conn))) {
if (conn->base_.type == CONN_TYPE_EXIT &&
(conn->base_.state == EXIT_CONN_STATE_CONNECTING ||
@ -1506,8 +1511,14 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ,
switch (rh.command) {
case RELAY_COMMAND_DROP:
rep_hist_padding_count_read(PADDING_TYPE_DROP);
// log_info(domain,"Got a relay-level padding cell. Dropping.");
/* Already examined in circpad_deliver_recognized_relay_cell_events */
return 0;
case RELAY_COMMAND_PADDING_NEGOTIATE:
circpad_handle_padding_negotiate(circ, cell);
return 0;
case RELAY_COMMAND_PADDING_NEGOTIATED:
if (circpad_handle_padding_negotiated(circ, cell, layer_hint) == 0)
circuit_read_valid_data(TO_ORIGIN_CIRCUIT(circ), rh.length);
return 0;
case RELAY_COMMAND_BEGIN:
case RELAY_COMMAND_BEGIN_DIR: