tor

commit 8ac3efda2fb27271307421d008f64787fdb12c8c
parent 1d2a4ac27a90415e16fdd4f7053033b7d7bcebc9
Author: Nick Mathewson <nickm@torproject.org>
Date:   Thu, 17 Apr 2025 19:39:43 -0400

Add a much-needed convenience accessor for max payload len.

Diffstat:
M
src/core/or/relay_msg.c
 | 
12
++++++++++++
M
src/core/or/relay_msg.h
 | 
3
+++

2 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/src/core/or/relay_msg.c b/src/core/or/relay_msg.c
@@ -300,3 +300,15 @@ circuit_get_relay_format(const circuit_t *circ, const crypt_path_t *cpath)
     tor_assert_unreached();
   }
 }
+
+/**
+ * Return the maximum relay payload that can be sent to the chosen
+ * point, with the specified command.
+ */
+size_t
+circuit_get_max_relay_payload(const circuit_t *circ, const crypt_path_t *cpath,
+                              uint8_t relay_command)
+{
+  relay_cell_fmt_t fmt = circuit_get_relay_format(circ, cpath);
+  return relay_cell_max_payload_size(fmt, relay_command);
+}
diff --git a/src/core/or/relay_msg.h b/src/core/or/relay_msg.h
@@ -34,6 +34,9 @@ relay_msg_t *relay_msg_decode_cell(
 /* Getters */
 relay_cell_fmt_t circuit_get_relay_format(const circuit_t *circ,
                                           const crypt_path_t *cpath);
+size_t circuit_get_max_relay_payload(const circuit_t *circ,
+                              const crypt_path_t *cpath,
+                              uint8_t relay_command);
 
 /*
  * NOTE: The following are inlined for performance reasons. These values are