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+Changes in version 0.3.0.6 - 2017-04-??
+  draft draft draft
+
+  o Major features (directory authority, security):
+    - The default for AuthDirPinKeys is now 1: directory authorities
+      will reject relays where the RSA identity key matches a previously
+      seen value, but the Ed25519 key has changed. Closes ticket 18319.
+
+  o Major features (guard selection algorithm):
+    - Tor's guard selection algorithm has been redesigned from the
+      ground up, to better support unreliable networks and restrictive
+      sets of entry nodes, and to better resist guard-capture attacks by
+      hostile local networks. Implements proposal 271; closes
+      ticket 19877.
+
+  o Major features (next-generation hidden services):
+    - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
+      prop224 aka "Next Generation Hidden Services". Service and clients
+      don't use this functionality yet. Closes ticket 19043. Based on
+      initial code by Alec Heifetz.
+    - Relays now support the HSDir version 3 protocol, so that they can
+      can store and serve v3 descriptors. This is part of the next-
+      generation onion service work detailled in proposal 224. Closes
+      ticket 17238.
+
+  o Major features (protocol, ed25519 identity keys):
+    - Clients now support including Ed25519 identity keys in the EXTEND2
+      cells they generate. By default, this is controlled by a consensus
+      parameter, currently disabled. You can turn this feature on for
+      testing by setting ExtendByEd25519ID in your configuration. This
+      might make your traffic appear different than the traffic
+      generated by other users, however. Implements part of ticket
+      15056; part of proposal 220.
+    - Relays now understand requests to extend to other relays by their
+      Ed25519 identity keys. When an Ed25519 identity key is included in
+      an EXTEND2 cell, the relay will only extend the circuit if the
+      other relay can prove ownership of that identity. Implements part
+      of ticket 15056; part of proposal 220.
+    - Relays now use Ed25519 to prove their Ed25519 identities and to
+      one another, and to clients. This algorithm is faster and more
+      secure than the RSA-based handshake we've been doing until now.
+      Implements the second big part of proposal 220; Closes
+      ticket 15055.
+
+  o Major features (security):
+    - Change the algorithm used to decide DNS TTLs on client and server
+      side, to better resist DNS-based correlation attacks like the
+      DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
+      Feamster. Now relays only return one of two possible DNS TTL
+      values, and clients are willing to believe DNS TTL values up to 3
+      hours long. Closes ticket 19769.
+
+  o Major bugfixes (client, onion service, also in 0.2.9.9):
+    - Fix a client-side onion service reachability bug, where multiple
+      socks requests to an onion service (or a single slow request)
+      could cause us to mistakenly mark some of the service's
+      introduction points as failed, and we cache that failure so
+      eventually we run out and can't reach the service. Also resolves a
+      mysterious "Remote server sent bogus reason code 65021" log
+      warning. The bug was introduced in ticket 17218, where we tried to
+      remember the circuit end reason as a uint16_t, which mangled
+      negative values. Partially fixes bug 21056 and fixes bug 20307;
+      bugfix on 0.2.8.1-alpha.
+
+  o Major bugfixes (crash, directory connections):
+    - Fix a rare crash when sending a begin cell on a circuit whose
+      linked directory connection had already been closed. Fixes bug
+      21576; bugfix on Tor 0.2.9.3-alpha. Reported by Alec Muffett.
+
+  o Major bugfixes (directory authority):
+    - During voting, when marking a relay as a probable sybil, do not
+      clear its BadExit flag: sybils can still be bad in other ways
+      too. (We still clear the other flags.) Fixes bug 21108; bugfix
+      on 0.2.0.13-alpha.
+
+  o Major bugfixes (DNS):
+    - Fix a bug that prevented exit nodes from caching DNS records for
+      more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
+
+  o Major bugfixes (IPv6 Exits):
+    - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
+      any IPv6 addresses. Instead, only reject a port over IPv6 if the
+      exit policy rejects that port on more than an IPv6 /16 of
+      addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
+      which rejected a relay's own IPv6 address by default. Fixes bug
+      21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
+
+  o Major bugfixes (parsing):
+    - Fix an integer underflow bug when comparing malformed Tor
+      versions. This bug could crash Tor when built with
+      --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
+      0.2.9.8, which were built with -ftrapv by default. In other cases
+      it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
+      on 0.0.8pre1. Found by OSS-Fuzz.
+    - When parsing a malformed content-length field from an HTTP
+      message, do not read off the end of the buffer. This bug was a
+      potential remote denial-of-service attack against Tor clients and
+      relays. A workaround was released in October 2016, to prevent this
+      bug from crashing Tor. This is a fix for the underlying issue,
+      which should no longer matter (if you applied the earlier patch).
+      Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
+      using AFL (http://lcamtuf.coredump.cx/afl/).
+
+  o Major bugfixes (scheduler):
+    - Actually compare circuit policies in ewma_cmp_cmux(). This bug
+      caused the channel scheduler to behave more or less randomly,
+      rather than preferring channels with higher-priority circuits.
+      Fixes bug 20459; bugfix on 0.2.6.2-alpha.
+
+  o Major bugfixes (security, also in 0.2.9.9):
+    - Downgrade the "-ftrapv" option from "always on" to "only on when
+      --enable-expensive-hardening is provided."  This hardening option, like
+      others, can turn survivable bugs into crashes--and having it on by
+      default made a (relatively harmless) integer overflow bug into a
+      denial-of-service bug. Fixes bug 21278 (TROVE-2017-001); bugfix on
+      0.2.9.1-alpha.
+
+  o Minor feature (client):
+    - Enable IPv6 traffic on the SocksPort by default. To disable this,
+      a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
+
+  o Minor feature (fallback scripts):
+    - Add a check_existing mode to updateFallbackDirs.py, which checks
+      if fallbacks in the hard-coded list are working. Closes ticket
+      20174. Patch by haxxpop.
+
+  o Minor feature (protocol versioning):
+    - Add new protocol version for proposal 224. HSIntro now advertises
+      version "3-4" and HSDir version "1-2". Fixes ticket 20656.
+
+  o Minor features (ciphersuite selection):
+    - Allow relays to accept a wider range of ciphersuites, including
+      chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
+    - Clients now advertise a list of ciphersuites closer to the ones
+      preferred by Firefox. Closes part of ticket 15426.
+
+  o Minor features (controller):
+    - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
+      shared-random values to the controller. Closes ticket 19925.
+    - When HSFETCH arguments cannot be parsed, say "Invalid argument"
+      rather than "unrecognized." Closes ticket 20389; patch from
+      Ivan Markin.
+
+  o Minor features (controller, configuration):
+    - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
+      and so on, now comes with a __*Port variant that will not be saved
+      to the torrc file by the controller's SAVECONF command. This
+      change allows TorBrowser to set up a single-use domain socket for
+      each time it launches Tor. Closes ticket 20956.
+    - The GETCONF command can now query options that may only be
+      meaningful in context-sensitive lists. This allows the controller
+      to query the mixed SocksPort/__SocksPort style options introduced
+      in feature 20956. Implements ticket 21300.
+
+  o Minor features (diagnostic, directory client):
+    - Warn when we find an unexpected inconsistency in directory
+      download status objects. Prevents some negative consequences of
+      bug 20593.
+
+  o Minor features (directory authorities):
+    - Directory authorities now reject descriptors that claim to be
+      malformed versions of Tor. Helps prevent exploitation of
+      bug 21278.
+    - Reject version numbers with components that exceed INT32_MAX.
+      Otherwise 32-bit and 64-bit platforms would behave inconsistently.
+      Fixes bug 21450; bugfix on 0.0.8pre1.
+
+  o Minor features (directory authority):
+    - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
+      default) to control whether authorities should try to probe relays
+      by their Ed25519 link keys. This option will go away in a few
+      releases--unless we encounter major trouble in our ed25519 link
+      protocol rollout, in which case it will serve as a safety option.
+
+  o Minor features (directory cache):
+    - Relays and bridges will now refuse to serve the consensus they
+      have if they know it is too old for a client to use. Closes
+      ticket 20511.
+
+  o Minor features (ed25519 link handshake):
+    - Advertise support for the ed25519 link handshake using the
+      subprotocol-versions mechanism, so that clients can tell which
+      relays can identity themselves by Ed25519 ID. Closes ticket 20552.
+
+  o Minor features (entry guards):
+    - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
+      break regression tests.
+    - Require UseEntryGuards when UseBridges is set, in order to make
+      sure bridges aren't bypassed. Resolves ticket 20502.
+
+  o Minor features (fallback directories):
+    - Allow 3 fallback relays per operator, which is safe now that we
+      are choosing 200 fallback relays. Closes ticket 20912.
+    - Annotate updateFallbackDirs.py with the bandwidth and consensus
+      weight for each candidate fallback. Closes ticket 20878.
+    - Display the relay fingerprint when downloading consensuses from
+      fallbacks. Closes ticket 20908.
+    - Exclude relays affected by bug 20499 from the fallback list.
+      Exclude relays from the fallback list if they are running versions
+      known to be affected by bug 20499, or if in our tests they deliver
+      a stale consensus (i.e. one that expired more than 24 hours ago).
+      Closes ticket 20539.
+    - Make it easier to change the output sort order of fallbacks.
+      Closes ticket 20822.
+    - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
+      ticket 18828.
+    - Require fallback directories to have the same address and port for
+      7 days (now that we have enough relays with this stability).
+      Relays whose OnionOO stability timer is reset on restart by bug
+      18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
+      this issue. Closes ticket 20880; maintains short-term fix
+      in 0.2.8.2-alpha.
+    - Require fallbacks to have flags for 90% of the time (weighted
+      decaying average), rather than 95%. This allows at least 73% of
+      clients to bootstrap in the first 5 seconds without contacting an
+      authority. Part of ticket 18828.
+    - Select 200 fallback directories for each release. Closes
+      ticket 20881.
+
+  o Minor features (fingerprinting resistence, authentication):
+    - Extend the length of RSA keys used for TLS link authentication to
+      2048 bits. (These weren't used for forward secrecy; for forward
+      secrecy, we used P256.) Closes ticket 13752.
+
+  o Minor features (geoip):
+    - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
+      Country database.
+    - Update geoip and geoip6 to the March 7 2017 Maxmind GeoLite2
+      Country database.
+
+  o Minor features (geoip, also in 0.2.9.9):
+    - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
+      Country database.
+
+  o Minor features (infrastructure):
+    - Implement smartlist_add_strdup() function. Replaces the use of
+      smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
+
+  o Minor features (linting):
+    - Enhance the changes file linter to warn on Tor versions that are
+      prefixed with "tor-". Closes ticket 21096.
+
+  o Minor features (logging):
+    - In several places, describe unset ed25519 keys as "<unset>",
+      rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
+
+  o Minor features (portability, compilation):
+    - Autoconf now checks to determine if OpenSSL structures are opaque,
+      instead of explicitly checking for OpenSSL version numbers. Part
+      of ticket 21359.
+    - Support building with recent LibreSSL code that uses opaque
+      structures. Closes ticket 21359.
+
+  o Minor features (relay):
+    - We now allow separation of exit and relay traffic to different
+      source IP addresses, using the OutboundBindAddressExit and
+      OutboundBindAddressOR options respectively. Closes ticket 17975.
+      Written by Michael Sonntag.
+
+  o Minor features (reliability, crash):
+    - Try better to detect problems in buffers where they might grow (or
+      think they have grown) over 2 GB in size. Diagnostic for
+      bug 21369.
+
+  o Minor features (testing):
+    - During 'make test-network-all', if tor logs any warnings, ask
+      chutney to output them. Requires a recent version of chutney with
+      the 21572 patch. Implements 21570.
+
+  o Minor bugfix (control protocol):
+    - The reply to a "GETINFO config/names" request via the control
+      protocol now spells the type "Dependent" correctly. This is a
+      breaking change in the control protocol. (The field seems to be
+      ignored by the most common known controllers.) Fixes bug 18146;
+      bugfix on 0.1.1.4-alpha.
+
+  o Minor bugfix (logging):
+    - Don't recommend the use of Tor2web in non-anonymous mode.
+      Recommending Tor2web is a bad idea because the client loses all
+      anonymity. Tor2web should only be used in specific cases by users
+      who *know* and understand the issues. Fixes bug 21294; bugfix
+      on 0.2.9.3-alpha.
+
+  o Minor bugfixes (bug resilience):
+    - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
+      19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
+      Hans Jerry Illikainen.
+
+  o Minor bugfixes (build):
+    - Replace obsolete Autoconf macros with their modern equivalent and
+      prevent similar issues in the future. Fixes bug 20990; bugfix
+      on 0.1.0.1-rc.
+
+  o Minor bugfixes (certificate expiration time):
+    - Avoid using link certificates that don't become valid till some
+      time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
+
+  o Minor bugfixes (client):
+    - Always recover from failures in extend_info_from_node(), in an
+      attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
+      bugfix on 0.2.3.1-alpha.
+    - When clients that use bridges start up with a cached consensus on
+      disk, they were ignoring it and downloading a new one. Now they
+      use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
+
+  o Minor bugfixes (code correctness):
+    - Repair a couple of (unreachable or harmless) cases of the risky
+      comparison-by-subtraction pattern that caused bug 21278.
+
+  o Minor bugfixes (config):
+    - Don't assert on startup when trying to get the options list and
+      LearnCircuitBuildTimeout is set to 0: we are currently parsing the
+      options so of course they aren't ready yet. Fixes bug 21062;
+      bugfix on 0.2.9.3-alpha.
+
+  o Minor bugfixes (configuration):
+    - Accept non-space whitespace characters after the severity level in
+      the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
+    - Support "TByte" and "TBytes" units in options given in bytes.
+      "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
+      supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
+
+  o Minor bugfixes (configure, autoconf):
+    - Rename the configure option --enable-expensive-hardening to
+      --enable-fragile-hardening. Expensive hardening makes the tor
+      daemon abort when some kinds of issues are detected. Thus, it
+      makes tor more at risk of remote crashes but safer against RCE or
+      heartbleed bug category. We now try to explain this issue in a
+      message from the configure script. Fixes bug 21290; bugfix
+      on 0.2.5.4-alpha.
+
+  o Minor bugfixes (consensus weight):
+    - Add new consensus method that initializes bw weights to 1 instead
+      of 0. This prevents a zero weight from making it all the way to
+      the end (happens in small testing networks) and causing an error.
+      Fixes bug 14881; bugfix on 0.2.2.17-alpha.
+
+  o Minor bugfixes (dead code):
+    - Remove a redundant check for PidFile changes at runtime in
+      options_transition_allowed(): this check is already performed
+      regardless of whether the sandbox is active. Fixes bug 21123;
+      bugfix on 0.2.5.4-alpha.
+
+  o Minor bugfixes (descriptors):
+    - Correctly recognise downloaded full descriptors as valid, even
+      when using microdescriptors as circuits. This affects clients with
+      FetchUselessDescriptors set, and may affect directory authorities.
+      Fixes bug 20839; bugfix on 0.2.3.2-alpha.
+
+  o Minor bugfixes (directory mirrors):
+    - Allow relays to use directory mirrors without a DirPort: these
+      relays need to be contacted over their ORPorts using a begindir
+      connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
+    - Clarify the message logged when a remote relay is unexpectedly
+      missing an ORPort or DirPort: users were confusing this with a
+      local port. Fixes another case of bug 20711; bugfix
+      on 0.2.8.2-alpha.
+
+  o Minor bugfixes (directory system):
+    - Bridges and relays now use microdescriptors (like clients do)
+      rather than old-style router descriptors. Now bridges will blend
+      in with clients in terms of the circuits they build. Fixes bug
+      6769; bugfix on 0.2.3.2-alpha.
+    - Download all consensus flavors, descriptors, and authority
+      certificates when FetchUselessDescriptors is set, regardless of
+      whether tor is a directory cache or not. Fixes bug 20667; bugfix
+      on all recent tor versions.
+
+  o Minor bugfixes (documentation):
+    - Update the tor manual page to document every option that can not
+      be changed while tor is running. Fixes bug 21122.
+
+  o Minor bugfixes (ed25519 certificates):
+    - Correctly interpret ed25519 certificates that would expire some
+      time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
+
+  o Minor bugfixes (fallback directories):
+    - Avoid checking fallback candidates' DirPorts if they are down in
+      OnionOO. When a relay operator has multiple relays, this
+      prioritizes relays that are up over relays that are down. Fixes
+      bug 20926; bugfix on 0.2.8.3-alpha.
+    - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
+      Fixes bug 20877; bugfix on 0.2.8.3-alpha.
+    - Stop failing when a relay has no uptime data in
+      updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
+
+  o Minor bugfixes (hidden service):
+    - Clean up the code for expiring intro points with no associated
+      circuits. It was causing, rarely, a service with some expiring
+      introduction points to not open enough additional introduction
+      points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
+    - Resolve two possible underflows which could lead to creating and
+      closing a lot of introduction point circuits in a non-stop loop.
+      Fixes bug 21302; bugfix on 0.2.7.2-alpha.
+    - Stop setting the torrc option HiddenServiceStatistics to "0" just
+      because we're not a bridge or relay. Instead, we preserve whatever
+      value the user set (or didn't set). Fixes bug 21150; bugfix
+      on 0.2.6.2-alpha.
+
+  o Minor bugfixes (hidden services):
+    - Make hidden services check for failed intro point connections,
+      even when they have exceeded their intro point creation limit.
+      Fixes bug 21596; bugfix on Tor 0.2.7.2-alpha. Reported by
+      Alec Muffett.
+    - Make hidden services with 8 to 10 introduction points check for
+      failed circuits immediately after startup. Previously, they would
+      wait for 5 minutes before performing their first checks. Fixes bug
+      21594; bugfix on Tor 0.2.3.9-alpha. Reported by Alec Muffett.
+    - Stop ignoring misconfigured hidden services. Instead, refuse to
+      start tor until the misconfigurations have been corrected. Fixes
+      bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
+      and earlier.
+
+  o Minor bugfixes (IPv6):
+    - Make IPv6-using clients try harder to find an IPv6 directory
+      server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
+    - When IPv6 addresses have not been downloaded yet (microdesc
+      consensus documents don't list relay IPv6 addresses), use hard-
+      coded addresses for authorities, fallbacks, and configured
+      bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
+      20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
+
+  o Minor bugfixes (memory leak at exit):
+    - Fix a small harmless memory leak at exit of the previously unused
+      RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
+      on 0.2.7.2-alpha.
+
+  o Minor bugfixes (onion services):
+    - Allow the number of introduction points to be as low as 0, rather
+      than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
+
+  o Minor bugfixes (portability):
+    - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
+      It is supported by OpenBSD itself, and also by most OpenBSD
+      variants (such as Bitrig). Fixes bug 20980; bugfix
+      on 0.1.2.1-alpha.
+
+  o Minor bugfixes (portability, also in 0.2.9.9):
+    - Avoid crashing when Tor is built using headers that contain
+      CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
+      without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
+      on 0.2.9.1-alpha.
+    - Fix Libevent detection on platforms without Libevent 1 headers
+      installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
+
+  o Minor bugfixes (relay):
+    - Avoid a double-marked-circuit warning that could happen when we
+      receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
+      on 0.1.0.1-rc.
+    - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
+      initializing the keys would reset the DataDirectory to 0700
+      instead of 0750 even if DataDirectoryGroupReadable was set to 1.
+      Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
+
+  o Minor bugfixes (testing):
+    - Fix Raspbian build issues related to missing socket errno in
+      test_util.c. Fixes bug 21116; bugfix on tor-0.2.8.2. Patch
+      by "hein".
+    - Remove undefined behavior from the backtrace generator by removing
+      its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
+    - Use bash in src/test/test-network.sh. This ensures we reliably
+      call chutney's newer tools/test-network.sh when available. Fixes
+      bug 21562; bugfix on 0.2.9.1-alpha.
+
+  o Minor bugfixes (tor-resolve):
+    - The tor-resolve command line tool now rejects hostnames over 255
+      characters in length. Previously, it would silently truncate them,
+      which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
+      Patch by "junglefowl".
+
+  o Minor bugfixes (unit tests):
+    - Allow the unit tests to pass even when DNS lookups of bogus
+      addresses do not fail as expected. Fixes bug 20862 and 20863;
+      bugfix on unit tests introduced in 0.2.8.1-alpha
+      through 0.2.9.4-alpha.
+
+  o Minor bugfixes (util):
+    - When finishing writing a file to disk, if we were about to replace
+      the file with the temporary file created before and we fail to
+      replace it, remove the temporary file so it doesn't stay on disk.
+      Fixes bug 20646; bugfix on tor-0.2.0.7-alpha. Patch by fk.
+
+  o Minor bugfixes (Windows services):
+    - Be sure to initialize the monotonic time subsystem before using
+      it, even when running as an NT service. Fixes bug 21356; bugfix
+      on 0.2.9.1-alpha.
+
+  o Minor bugfixes (Windows):
+    - Check for getpagesize before using it to mmap files. This fixes
+      compilation in some MinGW environments. Fixes bug 20530; bugfix on
+      0.1.2.1-alpha. Reported by "ice".
+
+  o Code simplification and refactoring:
+    - Abolish all global guard context in entrynodes.c; replace with new
+      guard_selection_t structure as preparation for proposal 271.
+      Closes ticket 19858.
+    - Extract magic numbers in circuituse.c into defined variables.
+    - Introduce rend_service_is_ephemeral() that tells if given onion
+      service is ephemeral. Replace unclear NULL-checkings for service
+      directory with this function. Closes ticket 20526.
+    - Refactor circuit_is_available_for_use to remove unnecessary check.
+    - Refactor circuit_predict_and_launch_new for readability and
+      testability. Closes ticket 18873.
+    - Refactor code to manipulate global_origin_circuit_list into
+      separate functions. Closes ticket 20921.
+    - Refactor large if statement in purpose_needs_anonymity to use
+      switch statement instead. Closes part of ticket 20077.
+    - Refactor the hashing API to return negative values for errors, as
+      is done as throughout the codebase. Closes ticket 20717.
+    - Remove data structures that were used to index or_connection
+      objects by their RSA identity digests. These structures are fully
+      redundant with the similar structures used in the
+      channel abstraction.
+    - Remove duplicate code in the channel_write_*cell() functions.
+      Closes ticket 13827; patch from Pingl.
+    - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
+      use only purpose_needs_anonymity. Closes part of ticket 20077.
+    - The code to generate and parse EXTEND and EXTEND2 cells has been
+      replaced with code automatically generated by the
+      "trunnel" utility.
+
+  o Documentation (formatting):
+    - Clean up formatting of tor.1 man page and HTML doc, where <pre>
+      blocks were incorrectly appearing. Closes ticket 20885.
+
+  o Documentation (man page):
+    - Clarify many options in tor.1 and add some min/max values for
+      HiddenService options. Closes ticket 21058.
+
+  o Documentation:
+    - Change '1' to 'weight_scale' in consensus bw weights calculation
+      comments, as that is reality. Closes ticket 20273. Patch
+      from pastly.
+    - Clarify that when ClientRejectInternalAddresses is enabled (which
+      is the default), multicast DNS hostnames for machines on the local
+      network (of the form *.local) are also rejected. Closes
+      ticket 17070.
+    - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
+      250 KBytes to 2 MBytes. Fixes bug 20435; bugfix
+      on tor-0.2.5.6-alpha.
+    - Include the "TBits" unit in Tor's man page. Fixes part of bug
+      20622; bugfix on tor-0.2.5.1-alpha.
+    - Small fixes to the fuzzing documentation. Closes ticket 21472.
+    - Stop the man page from incorrectly stating that HiddenServiceDir
+      must already exist. Fixes 20486.
+    - Update the description of the directory server options in the
+      manual page, to clarify that a relay no longer needs to set
+      DirPort in order to be a directory cache. Closes ticket 21720.
+
+  o Removed features:
+    - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
+      limit for relays running on a single IP applies to authority IP
+      addresses as well as to non-authority IP addresses. Closes
+      ticket 20960.
+    - The UseDirectoryGuards torrc option no longer exists: all users
+      that use entry guards will also use directory guards. Related to
+      proposal 271; implements part of ticket 20831.
+
+  o Testing:
+    - Add tests for networkstatus_compute_bw_weights_v10.
+    - Add unit tests circuit_predict_and_launch_new.
+    - Extract dummy_origin_circuit_new so it can be used by other
+      test functions.
+    - New unit tests for tor_htonll(). Closes ticket 19563. Patch
+      from "overcaffeinated".
+    - Perform the coding style checks when running the tests and fail
+      when coding style violations are found. Closes ticket 5500.