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relay: Double the size of the relay reentry set

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This is to minimize false positive and thus deny reentry to Exit connections
that were in reality not re-entering. Helps with overall UX.

Signed-off-by: David Goulet <dgoulet@torproject.org>
This commit is contained in:
David Goulet 2021-02-01 09:04:50 -05:00
parent 2c3c30e58f
commit 838e07be9d
1 changed files with 6 additions and 2 deletions
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8
src/feature/nodelist/nodelist.c
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@ -670,8 +670,12 @@ nodelist_set_consensus(const networkstatus_t *ns)
address_set_free(the_nodelist->node_addrs);
addr_port_set_free(the_nodelist->reentry_set);
the_nodelist->node_addrs = address_set_new(estimated_addresses);
/* Times two here is for both the ORPort and DirPort. */
the_nodelist->reentry_set = addr_port_set_new(estimated_addresses * 2);
/* Times two here is for both the ORPort and DirPort. We double it again in
* order to minimize as much as possible the false positive when looking up
* this set. Reason is that Exit streams that are legitimate but end up a
* false positive against this set will thus be considered reentry and be
* rejected which means a bad UX. */
the_nodelist->reentry_set = addr_port_set_new(estimated_addresses * 2 * 2);
SMARTLIST_FOREACH_BEGIN(ns->routerstatus_list, routerstatus_t *, rs) {
node_t *node = node_get_or_create(rs->identity_digest);