Bug 31356: Propogate protover padding support to circpad

src/core/or/circuitpadding.c

@@ -2696,8 +2696,9 @@ circpad_node_supports_padding(const node_t *node)
 {
   if (node->rs) {
     log_fn(LOG_INFO, LD_CIRC, "Checking padding: %s",
-           node->rs->pv.supports_padding ? "supported" : "unsupported");
-    return node->rs->pv.supports_padding;
+           node->rs->pv.supports_hs_setup_padding ?
+              "supported" : "unsupported");
+    return node->rs->pv.supports_hs_setup_padding;
   }
 
   log_fn(LOG_INFO, LD_CIRC, "Empty routerstatus in padding check");

src/core/or/or.h

@@ -841,8 +841,8 @@ typedef struct protover_summary_flags_t {
   unsigned int supports_v3_rendezvous_point: 1;
 
   /** True iff this router has a protocol list that allows clients to
-   * negotiate link-level padding. Requires Padding>=1. */
-  unsigned int supports_padding : 1;
+   * negotiate hs circuit setup padding. Requires Padding>=2. */
+  unsigned int supports_hs_setup_padding : 1;
 } protover_summary_flags_t;
 
 typedef struct routerinfo_t routerinfo_t;

src/core/or/protover.h

@@ -28,6 +28,8 @@ struct smartlist_t;
 #define PROTOVER_HS_INTRO_V3 4
 /** The protover version number that signifies HSv3 rendezvous point support */
 #define PROTOVER_HS_RENDEZVOUS_POINT_V3 2
+/** The protover that signals support for HS circuit setup padding machines */
+#define PROTOVER_HS_SETUP_PADDING 2
 
 /** List of recognized subprotocols. */
 /// C_RUST_COUPLED: src/rust/protover/ffi.rs `translate_to_rust`

src/core/or/versions.c

@@ -448,8 +448,9 @@ memoize_protover_summary(protover_summary_flags_t *out,
   out->supports_v3_rendezvous_point =
     protocol_list_supports_protocol(protocols, PRT_HSREND,
                                     PROTOVER_HS_RENDEZVOUS_POINT_V3);
-    out->supports_padding =
-      protocol_list_supports_protocol(protocols, PRT_PADDING, 1);
+  out->supports_hs_setup_padding =
+    protocol_list_supports_protocol(protocols, PRT_PADDING,
+              PROTOVER_HS_SETUP_PADDING);
 
   protover_summary_flags_t *new_cached = tor_memdup(out, sizeof(*out));
   cached = strmap_set(protover_summary_map, protocols, new_cached);

src/test/test_circuitpadding.c

@@ -90,10 +90,10 @@ static void
 nodes_init(void)
 {
   padding_node.rs = tor_malloc_zero(sizeof(routerstatus_t));
-  padding_node.rs->pv.supports_padding = 1;
+  padding_node.rs->pv.supports_hs_setup_padding = 1;
 
   non_padding_node.rs = tor_malloc_zero(sizeof(routerstatus_t));
-  non_padding_node.rs->pv.supports_padding = 0;
+  non_padding_node.rs->pv.supports_hs_setup_padding = 0;
 }
 
 static void