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sendme: Helper to know if next cell is a SENDME
We'll use it this in order to know when to hash the cell for the SENDME instead of doing it at every cell. Part of #26288 Signed-off-by: David Goulet <dgoulet@torproject.org>
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@ -286,6 +286,29 @@ send_circuit_level_sendme(circuit_t *circ, crypt_path_t *layer_hint,
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return 0;
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}
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/*
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* Public API
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*/
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/** Return true iff the next cell for the given cell window is expected to be
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* a SENDME.
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*
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* We are able to know that because the package or deliver window value minus
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* one cell (the possible SENDME cell) should be a multiple of the increment
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* window value. */
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bool
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sendme_circuit_is_next_cell(int window)
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{
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/* Is this the last cell before a SENDME? The idea is that if the package or
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* deliver window reaches a multiple of the increment, after this cell, we
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* should expect a SENDME. */
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if (((window - 1) % CIRCWINDOW_INCREMENT) != 0) {
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return false;
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}
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/* Next cell is expected to be a SENDME. */
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return true;
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}
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/** Called when we've just received a relay data cell, when we've just
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* finished flushing all bytes to stream <b>conn</b>, or when we've flushed
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* *some* bytes to the stream <b>conn</b>.
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@ -550,7 +573,7 @@ sendme_note_cell_digest(circuit_t *circ)
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/* Is this the last cell before a SENDME? The idea is that if the
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* package_window reaches a multiple of the increment, after this cell, we
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* should expect a SENDME. */
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if (((circ->package_window - 1) % CIRCWINDOW_INCREMENT) != 0) {
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if (!sendme_circuit_is_next_cell(circ->package_window)) {
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return;
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}
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@ -37,6 +37,9 @@ int sendme_note_stream_data_packaged(edge_connection_t *conn);
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/* Track cell digest. */
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void sendme_note_cell_digest(circuit_t *circ);
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/* Circuit level information. */
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bool sendme_circuit_is_next_cell(int window);
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/* Private section starts. */
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#ifdef SENDME_PRIVATE
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