[tor-commits] [tor/release-0.3.3] dir auths no longer vote Guard if they're not voting V2Dir

[nickm at torproject.org]

commit 961d2ad597134df0171dbbed2e035ae93e2215c6
Author: Roger Dingledine <arma at torproject.org>
Date:   Mon Apr 2 00:20:01 2018 -0400

    dir auths no longer vote Guard if they're not voting V2Dir
    
    Directory authorities no longer vote in favor of the Guard flag
    for relays that don't advertise directory support.
    
    Starting in Tor 0.3.0.1-alpha, Tor clients have been avoiding using
    such relays in the Guard position, leading to increasingly broken load
    balancing for the 5%-or-so of Guards that don't advertise directory
    support.
    
    Fixes bug 22310; bugfix on 0.3.0.6.
---
 changes/bug22310 | 8 ++++++++
 src/or/dirserv.c | 1 +
 2 files changed, 9 insertions(+)

diff --git a/changes/bug22310 b/changes/bug22310
new file mode 100644
index 000000000..c8017daff
--- /dev/null
+++ b/changes/bug22310
@@ -0,0 +1,8 @@
+  o Major bugfixes (performance, load balancing):
+    - Directory authorities no longer vote in favor of the Guard flag
+      for relays that don't advertise directory support. Starting in Tor
+      0.3.0.1-alpha, Tor clients have been avoiding using such relays in
+      the Guard position, leading to increasingly broken load balancing
+      for the 5%-or-so of Guards that don't advertise directory support.
+      Fixes bug 22310; bugfix on 0.3.0.6.
+
diff --git a/src/or/dirserv.c b/src/or/dirserv.c
index 0f47a8398..f0333e288 100644
--- a/src/or/dirserv.c
+++ b/src/or/dirserv.c
@@ -2266,6 +2266,7 @@ set_routerstatus_from_routerinfo(routerstatus_t *rs,
   rs->is_valid = node->is_valid;
 
   if (node->is_fast && node->is_stable &&
+      ri->supports_tunnelled_dir_requests &&
       ((options->AuthDirGuardBWGuarantee &&
         routerbw_kb >= options->AuthDirGuardBWGuarantee/1000) ||
        routerbw_kb >= MIN(guard_bandwidth_including_exits_kb,