commit 2938fd3b859a71b9f484623b8dae61e8e7a7f7ec Author: George Kadianakis desnacked@riseup.net Date: Tue Jan 17 12:59:41 2017 +0200
prop271: When we exhaust all guards, mark all of them for retry.
In the past, when we exhausted all guards in our sampled set, we just waited there till we mark a guard for retry again (usually takes 10 mins for a primary guard, 1 hour for a non-primary guard). This patch marks all guards as maybe-reachable when we exhaust all guards (this can happen when network is down for some time). --- changes/bug21052 | 4 ++++ src/or/entrynodes.c | 39 +++++++++++++++++++++++++++++++-------- 2 files changed, 35 insertions(+), 8 deletions(-)
diff --git a/changes/bug21052 b/changes/bug21052 new file mode 100644 index 0000000..0597b3b --- /dev/null +++ b/changes/bug21052 @@ -0,0 +1,4 @@ + o Minor bugfixes (client, guards): + - Fix a bug of the new guard algorithm where tor could stall for up to 10 + minutes before retrying a guard after a long period of no network. + Fixes bug 21052; bugfix on 0.3.0.1-alpha. diff --git a/src/or/entrynodes.c b/src/or/entrynodes.c index ca3e57b..2b70230 100644 --- a/src/or/entrynodes.c +++ b/src/or/entrynodes.c @@ -1900,7 +1900,9 @@ select_entry_guard_for_circuit(guard_selection_t *gs, SAMPLE_EXCLUDE_PRIMARY | SAMPLE_EXCLUDE_PENDING); if (guard == NULL) { - log_info(LD_GUARD, "Absolutely no sampled guards were available."); + log_info(LD_GUARD, "Absolutely no sampled guards were available. " + "Marking all guards for retry and starting from top again."); + mark_all_guards_maybe_reachable(gs); return NULL; } guard->is_pending = 1; @@ -1937,6 +1939,21 @@ entry_guards_note_guard_failure(guard_selection_t *gs, entry_guard_describe(guard)); }
+/* Mark <b>guard</b> as maybe reachable again. */ +static void +mark_guard_maybe_reachable(entry_guard_t *guard) +{ + if (guard->is_reachable != GUARD_REACHABLE_NO) { + return; + } + + /* Note that we do not clear failing_since: this guard is now only + * _maybe-reachable_. */ + guard->is_reachable = GUARD_REACHABLE_MAYBE; + if (guard->is_filtered_guard) + guard->is_usable_filtered_guard = 1; +} + /** * Called when the network comes up after having seemed to be down for * a while: Mark the primary guards as maybe-reachable so that we'll @@ -1945,19 +1962,25 @@ entry_guards_note_guard_failure(guard_selection_t *gs, STATIC void mark_primary_guards_maybe_reachable(guard_selection_t *gs) { + tor_assert(gs); + if (!gs->primary_guards_up_to_date) entry_guards_update_primary(gs);
SMARTLIST_FOREACH_BEGIN(gs->primary_entry_guards, entry_guard_t *, guard) { - if (guard->is_reachable != GUARD_REACHABLE_NO) - continue; + mark_guard_maybe_reachable(guard); + } SMARTLIST_FOREACH_END(guard); +}
- /* Note that we do not clear failing_since: this guard is now only - * _maybe-reachable_. */ - guard->is_reachable = GUARD_REACHABLE_MAYBE; - if (guard->is_filtered_guard) - guard->is_usable_filtered_guard = 1; +/* Called when we exhaust all guards in our sampled set: Marks all guards as + * maybe-reachable so that we 'll try them again. */ +static void +mark_all_guards_maybe_reachable(guard_selection_t *gs) +{ + tor_assert(gs);
+ SMARTLIST_FOREACH_BEGIN(gs->sampled_entry_guards, entry_guard_t *, guard) { + mark_guard_maybe_reachable(guard); } SMARTLIST_FOREACH_END(guard); }