New upstream version 3.1.1

CHANGELOG.md

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+# Changelog
+
+## n2n 2.8 (August 2020)
+
+This release brings significant new features to n2n's crypto world and offers
+some compression opportunities. The added support for routing table manipulation
+might increase comfort. Besides further honing existing features, this release
+addresses some bugs.
+
+### New Features
+
+* Two lightweight stream ciphers: ChaCha20 (optional, through OpenSSL) & SPECK (integrated)
+* Full Header Encryption (including packet checksumming as well as replay protection)
+* A callback interface to better integrate n2n in third party software (you can still use it stand-alone)
+* Enable the integrated LZO1x compression
+* Add optional ZSTD compression (through zstdlib)
+* Support for changing system routes at program start and end
+* User and group id parameter for supernode
+* Application of cryptography in n2n is seperately documented
+* Add a new pseudo random number generator with higher periodicity seeded with more entropy if available
+
+### Improvements
+
+* Have AES and ChaCha20 use OpenSSL's `evp_*` interface to make better use of available hardware acceleration
+* Fix invalid sendto when supernode name resolution fails
+* Update to supernode's purge logic
+* Extended management supernode's port output
+* Fix read tap device failed when OS wakes up from sleep
+* Free choice of supernode's management UDP port (for multiple supernodes on one machine)
+* Additional trace messages to better indicate established connections and connection type
+* Fix edge's register-to-supernode loop
+* Remove redundant code
+* Restructure the code in directories
+* Clean-up platform-dependant code
+* Compile fixes for Windows
+* Fix build warnings
+* …and many more under-the-hood fixes and tunings
+
+## n2n 2.6 (March 2020)
+
+The 2.6 release is mostly a maintenance release to address the issues 
+of 2.4 that has been the first release since a long time of silence.
+
+### New Features
+
+* AES encryption that features an overall speed bump (12x speed) and security with respect to Twofish used in the previous n2n version
+* Add ability to specify a whitelist of allowed communities on the supernode
+* Implement local peers discovery via multicast
+* Full peer-to-peer topology support.
+* Add support for multiple edge systemd services
+* Add benchmark tool for the encryption throughput
+* Implement packet stats for P2P vs supernode communication
+* Automatically drop privileges to user n2n
+* Add support for ARM64 build
+* More options to control MTU, P2P connections, TOS and log verbosity
+* Implement a wireshark dissector for the n2n protocol
+* Implement n2n-decode utility to decode and dump traffic to PCAP
+
+
+### Improvements
+* Extensive Windows and OpenWRT support.
+* Windows compilation fixes and instructions
+* Instructions and makefile file to build n2n on OpenWRT
+* MacOS compilation fixes and instructions
+* Improve the connection stability and the chances to establish a P2P connection
+* Stable and more resilient connection.
+* Remove keyschedule support to simplify the encryption code
+* Replace peers linked list with hash table for faster lookup in big networks
+* Integrate the changes made in the meyerd fork of n2n
+* Remove calls to system() in tuntap_linux and use netlink instead
+* n2n version improvements
+
+## n2n 2.4 (August 2018)
+
+This is the first release after 2012 and thus it is focusing mainly
+on making it work on current operating system versions, so that the
+next release will be based on modern code.
+
+### New Features
+* Added deb/rpm packages
+* Added systemd configuration files
+* Added ability to read configuration files instead of using only the CLI (needed for packaging)
+* Added n2n Android app
+* Implemented simple API to embed n2n in applications (in addition to use it stand-alone)
+
+### Improvements
+* Major code cleanup
+* Fixed compilation issues on MacOS
+* Fixed Linux segmentation fault