protover: Add node functions for IPv6 extend support

Part of 33226.

2 files changed, 19 insertions, 0 deletions

diff --git a/src/core/or/or.h b/src/core/or/or.h
index 28211b48c6..7e02da6648 100644
--- a/src/core/or/or.h
+++ b/src/core/or/or.h
@@ -815,6 +815,18 @@ typedef struct protover_summary_flags_t {
    * accept EXTEND2 cells. This requires Relay=2. */
   unsigned int supports_extend2_cells:1;
 
+  /** True iff this router has a version or protocol list that allows it to
+   * accept IPv6 connections. This requires Relay=2 or Relay=3. */
+  unsigned int supports_accepting_ipv6_extends:1;
+
+  /** True iff this router has a version or protocol list that allows it to
+   * initiate IPv6 connections. This requires Relay=3. */
+  unsigned int supports_initiating_ipv6_extends:1;
+
+  /** True iff this router has a version or protocol list that allows it to
+   * consider IPv6 connections canonical. This requires Relay=3. */
+  unsigned int supports_canonical_ipv6_conns:1;
+
   /** True iff this router has a protocol list that allows it to negotiate
    * ed25519 identity keys on a link handshake with us. This
    * requires LinkAuth=3. */
diff --git a/src/core/or/versions.c b/src/core/or/versions.c
index 2a33bf68fe..a8dfe7e61c 100644
--- a/src/core/or/versions.c
+++ b/src/core/or/versions.c
@@ -437,6 +437,13 @@ memoize_protover_summary(protover_summary_flags_t *out,
 
   out->supports_extend2_cells =
     protocol_list_supports_protocol(protocols, PRT_RELAY, 2);
+  out->supports_accepting_ipv6_extends = (
+    protocol_list_supports_protocol(protocols, PRT_RELAY, 2) ||
+    protocol_list_supports_protocol(protocols, PRT_RELAY, 3));
+  out->supports_initiating_ipv6_extends =
+    protocol_list_supports_protocol(protocols, PRT_RELAY, 3);
+  out->supports_canonical_ipv6_conns =
+    protocol_list_supports_protocol(protocols, PRT_RELAY, 3);
 
   out->supports_ed25519_link_handshake_compat =
     protocol_list_supports_protocol(protocols, PRT_LINKAUTH, 3);