Add ClientUseIPv4 and ClientPreferIPv6DirPort torrc options

ClientUseIPv4 0 tells tor to avoid IPv4 client connections.
ClientPreferIPv6DirPort 1 tells tor to prefer IPv6 directory connections.

Refactor policy for IPv4/IPv6 preferences.

Fix a bug where node->ipv6_preferred could become stale if
ClientPreferIPv6ORPort was changed after the consensus was loaded.

Update documentation, existing code, add unit tests.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/or/nodelist.h b/src/or/nodelist.h
index a131e0dd4e..fa1f22e630 100644
--- a/src/or/nodelist.h
+++ b/src/or/nodelist.h
@@ -21,6 +21,8 @@ MOCK_DECL(const node_t *, node_get_by_id, (const char *identity_digest));
 const node_t *node_get_by_hex_id(const char *identity_digest);
 node_t *nodelist_set_routerinfo(routerinfo_t *ri, routerinfo_t **ri_old_out);
 node_t *nodelist_add_microdesc(microdesc_t *md);
+int nodelist_prefer_ipv6_orport(const or_options_t *options);
+int nodelist_prefer_ipv6_dirport(const or_options_t *options);
 void nodelist_set_consensus(networkstatus_t *ns);
 
 void nodelist_remove_microdesc(const char *identity_digest, microdesc_t *md);
@@ -55,10 +57,17 @@ void node_get_address_string(const node_t *node, char *cp, size_t len);
 long node_get_declared_uptime(const node_t *node);
 time_t node_get_published_on(const node_t *node);
 const smartlist_t *node_get_declared_family(const node_t *node);
-int node_ipv6_preferred(const node_t *node);
+
+/* Deprecated - use node_ipv6_or_preferred or node_ipv6_dir_preferred */
+#define node_ipv6_preferred(node) node_ipv6_or_preferred(node)
+int node_ipv6_or_preferred(const node_t *node);
 int node_get_prim_orport(const node_t *node, tor_addr_port_t *ap_out);
 void node_get_pref_orport(const node_t *node, tor_addr_port_t *ap_out);
 void node_get_pref_ipv6_orport(const node_t *node, tor_addr_port_t *ap_out);
+int node_ipv6_dir_preferred(const node_t *node);
+int node_get_prim_dirport(const node_t *node, tor_addr_port_t *ap_out);
+void node_get_pref_dirport(const node_t *node, tor_addr_port_t *ap_out);
+void node_get_pref_ipv6_dirport(const node_t *node, tor_addr_port_t *ap_out);
 int node_has_curve25519_onion_key(const node_t *node);
 
 MOCK_DECL(smartlist_t *, nodelist_get_list, (void));