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Add exitpolicy summaries to the consensus

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svn:r16554
This commit is contained in:
Peter Palfrader 2008-08-14 23:01:31 +00:00
parent e4f426a306
commit fd05b385e3
1 changed files with 25 additions and 4 deletions
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proposals/141-jit-sd-downloads.txt
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@ -259,11 +259,32 @@ Status: Draft
use an accept-style summary and list as much of the port list as is
possible within these 1000 bytes.
Similarly to IP address, ports, and timestamp a consensus should list
the exit policy matching the descriptor digest referenced in the
consensus document (See dir-spec section 3.4).
3.4.1 Consensus selection
3.4.1 Client behaviour
When building a consensus, authorities have to agree on a digest of
the server descriptor to list in the router line for each router.
This is documented in dir-spec section 3.4.
All authorities that listed that agreed upon descriptor digest in
their vote should also list the same exit policy summary - or list
none at all if the authority has not been upgraded to list that
information in their vote.
If we have votes with matching server descriptor digest of which at
least one of them has an exit policy then we differ between two cases:
a) all authorities agree (or abstained) on the policy summary, and we
use the exit policy summary that they all listed in their vote,
b) something went wrong (or some authority is playing foul) and we
have different policy summaries. In that case we pick the one
that is most commonly listed in votes with the matching
descriptor. We break ties in favour of the lexigraphically larger
vote.
If none one of the votes with a matching server descriptor digest has
an exit policy summary we use the most commonly listed one in all
votes, breaking ties like in case b above.
3.4.2 Client behaviour
When choosing an exit node for a specific request a Tor client will
choose from the list of nodes that exit to the requested port as given