hs: Transfer ccontrol from circuit to cpath

Once the cpath is finalized, e2e encryption setup, transfer the ccontrol
from the rendezvous circuit to the cpath.

This allows the congestion control subsystem to properly function for
both upload and download side of onion services.

Closes #40586

Signed-off-by: David Goulet <dgoulet@torproject.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/feature/hs/hs_circuit.c b/src/feature/hs/hs_circuit.c
index f8a0e06d90..6c4e315e4e 100644
--- a/src/feature/hs/hs_circuit.c
+++ b/src/feature/hs/hs_circuit.c
@@ -131,6 +131,12 @@ finalize_rend_circuit(origin_circuit_t *circ, crypt_path_t *hop,
    * so we can actually use it. */
   circ->hs_circ_has_timed_out = 0;
 
+  /* If congestion control, transfer ccontrol onto the cpath. */
+  if (TO_CIRCUIT(circ)->ccontrol) {
+    hop->ccontrol = TO_CIRCUIT(circ)->ccontrol;
+    TO_CIRCUIT(circ)->ccontrol = NULL;
+  }
+
   /* Append the hop to the cpath of this circuit */
   cpath_extend_linked_list(&circ->cpath, hop);
 
@@ -416,6 +422,11 @@ launch_rendezvous_point_circuit,(const hs_service_t *service,
       .sendme_inc_cells = congestion_control_sendme_inc(),
     };
 
+    /* It is setup on the circuit in order to indicate that congestion control
+     * is enabled. It will be transferred to the RP crypt_path_t once the
+     * handshake is finalized in finalize_rend_circuit() because the final hop
+     * is not available until then. */
+
     /* Initialize ccontrol for appropriate path type */
     if (service->config.is_single_onion) {
       TO_CIRCUIT(circ)->ccontrol = congestion_control_new(&circ_params,
@@ -533,6 +544,11 @@ retry_service_rendezvous_point(const origin_circuit_t *circ)
       .sendme_inc_cells = TO_CIRCUIT(circ)->ccontrol->sendme_inc,
     };
 
+    /* It is setup on the circuit in order to indicate that congestion control
+     * is enabled. It will be transferred to the RP crypt_path_t once the
+     * handshake is finalized in finalize_rend_circuit() because the final hop
+     * is not available until then. */
+
     /* As per above, in this case, we are a full 3 hop rend, even if we're a
      * single-onion service */
     if (get_options()->HSLayer3Nodes) {