commit 0e6e800c89c7cfef255491179473e13de5f72d03 Author: David Goulet <dgoulet@torproject.org> Date: Wed Jan 9 11:03:49 2019 -0500 sendme: Always close stream if deliver window is negative Previously, we would only close the stream when our deliver window was negative at the circuit-level but _not_ at the stream-level when receiving a DATA cell. This commit adds an helper function connection_edge_end_close() which sends an END and then mark the stream for close for a given reason. That function is now used both in case the deliver window goes below zero for both circuit and stream level. Part of #26840 Signed-off-by: David Goulet <dgoulet@torproject.org> --- src/core/or/connection_edge.c | 19 +++++++++++++++++++ src/core/or/connection_edge.h | 1 + src/core/or/relay.c | 14 +++++--------- 3 files changed, 25 insertions(+), 9 deletions(-) diff --git a/src/core/or/connection_edge.c b/src/core/or/connection_edge.c index fa72fb771..8ed403456 100644 --- a/src/core/or/connection_edge.c +++ b/src/core/or/connection_edge.c @@ -4565,6 +4565,25 @@ circuit_clear_isolation(origin_circuit_t *circ) circ->socks_username_len = circ->socks_password_len = 0; } +/** Send an END and mark for close the given edge connection conn using the + * given reason that has to be a stream reason. + * + * Note: We don't unattached the AP connection (if applicable) because we + * don't want to flush the remaining data. This function aims at ending + * everything quickly regardless of the connection state. + * + * This function can't fail and does nothing if conn is NULL. */ +void +connection_edge_end_close(edge_connection_t *conn, uint8_t reason) +{ + if (!conn) { + return; + } + + connection_edge_end(conn, reason); + connection_mark_for_close(TO_CONN(conn)); +} + /** Free all storage held in module-scoped variables for connection_edge.c */ void connection_edge_free_all(void) diff --git a/src/core/or/connection_edge.h b/src/core/or/connection_edge.h index 68d8b19a1..e82b6bd76 100644 --- a/src/core/or/connection_edge.h +++ b/src/core/or/connection_edge.h @@ -80,6 +80,7 @@ int connection_edge_process_inbuf(edge_connection_t *conn, int connection_edge_destroy(circid_t circ_id, edge_connection_t *conn); int connection_edge_end(edge_connection_t *conn, uint8_t reason); int connection_edge_end_errno(edge_connection_t *conn); +void connection_edge_end_close(edge_connection_t *conn, uint8_t reason); int connection_edge_flushed_some(edge_connection_t *conn); int connection_edge_finished_flushing(edge_connection_t *conn); int connection_edge_finished_connecting(edge_connection_t *conn); diff --git a/src/core/or/relay.c b/src/core/or/relay.c index 06e201f20..6ff053d8a 100644 --- a/src/core/or/relay.c +++ b/src/core/or/relay.c @@ -1550,17 +1550,12 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, ++stats_n_data_cells_received; /* Update our circuit-level deliver window that we received a DATA cell. - * If the deliver window goes below 0, we end the connection due to a - * protocol failure. */ + * If the deliver window goes below 0, we end the circuit and stream due + * to a protocol failure. */ if (sendme_circuit_data_received(circ, layer_hint) < 0) { log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "(relay data) circ deliver_window below 0. Killing."); - if (conn) { - /* XXXX Do we actually need to do this? Will killing the circuit - * not send an END and mark the stream for close as appropriate? */ - connection_edge_end(conn, END_STREAM_REASON_TORPROTOCOL); - connection_mark_for_close(TO_CONN(conn)); - } + connection_edge_end_close(conn, END_STREAM_REASON_TORPROTOCOL); return -END_CIRC_REASON_TORPROTOCOL; } @@ -1590,11 +1585,12 @@ connection_edge_process_relay_cell(cell_t *cell, circuit_t *circ, /* Update our stream-level deliver window that we just received a DATA * cell. Going below 0 means we have a protocol level error so the - * circuit is closed. */ + * stream and circuit are closed. */ if (sendme_stream_data_received(conn) < 0) { log_fn(LOG_PROTOCOL_WARN, LD_PROTOCOL, "(relay data) conn deliver_window below 0. Killing."); + connection_edge_end_close(conn, END_STREAM_REASON_TORPROTOCOL); return -END_CIRC_REASON_TORPROTOCOL; } /* Total all valid application bytes delivered */