multicast disaster mitigation

[l2tpns.git] / Changes

* Sat May 21 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.21
- Cluster changes from Michael, intended to prevent a stray master
  from trashing a cluster:
  + Ignore heartbeats from peers claiming to be the master before the
    timeout on the old master has expired.
  + A master receiving a stray heartbeat sends a unicast HB back, which
    should cause the rogue to die due to the tie-breaker code.
  + Keep probing the master for late heartbeats.
  + Drop BGP as soon as we become master with peers (TODO: pre-emptively
    drop routes if the master is late and we are the best candidate).
  + A slave (presumably a recently restarted master) receiving a
    LASTSEEN message sends a zero basetime ping (as sent by the master
    on clean shutdown).
  
* Mon May 16 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.20
- Add handling of "throttle=N" RADIUS attributes.
- Fix RADIUS indexing (should have 16K entries with 64 sockets).

* Sat May 7 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.19
- Fix leak in session freelist when initial RADIUS session allocation
  fails.

* Tue May 3 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.18
- Add a Cisco-Avpair with intercept details to RADIUS Start/Stop
  records.

* Mon May 2 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.17
- Only send RADIUS stop record in sessionshutdown when there's an ip address.
- Reset .die on master takeover (so that dying sessions don't have to
  hang around until the new master has the same uptime as the old one).
- Update .last_packet in cluster_handle_bytes only when there have
  been bytes received from the modem (dead sessions were having the
  idle timeout reset by stray packets).

* Mon Feb 14 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.16
- Ensure that sessionkill is not called on an unopened session (borks
  the freelist).
- Bump MAXSESSION to 60K.
- Fix off-by-one errors in session/tunnel initialisation and
  sessiont <-> sessionidt functions.
- Use session[s].opened consistently when checking for in-use sessions
  (rather than session[s].tunnel).
- Use <= cluster_highest_sessionid rather than < MAXSESSION in a
  couple of loops.
- Don't kill a whole tunnel if we're out of sessions.
- Change session[s].ip to 0 if set from RADIUS to 255.255.255.254;
  avoids the possibility that it will be interpreted as a valid IP
  address.
- Avoid a possible buffer overflow in processpap.
- Kill session if authentication was rejected.

* Thu Jan 13 2005 Brendan O'Dea <bod@optusnet.com.au> 2.0.15
- More DoS prevention:  add packet_limit option to apply a hard limit
  to downstream packets per session.
- Fix "clear counters".
- Log "Accepted connection to CLI" at 4 when connection is from localhost
  to reduce noise in logs.
- Show time since last counter reset in "show counters".

* Mon Dec 20 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.14
- Throttle outgoing LASTSEEN packets to at most one per second for a
  given seq#.

* Fri Dec 17 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.13
- Better cluster master collision resolution: keep a counter of state
  changes, propagated in the heartbeats; the master with the highest #
  of changes (that has kept in contact with the LAC through the
  outage) prevails.
- Skip newlines in ringbuffer messages to CLI.
- Drop "Session N is closing" message level to 4; don't process PPPIP
  packets in this state.
- Use gzip --best for man pages, include pid_file in sample
  startup-config (from Jonathan's Debian package patches).
- Read multiple packets off cluster_sockfd as well as udpfd, tunfd in an
  attempt to avoid losing the cluster in high load (DoS) conditions.
- Add counters for select_called, multi_read_used and multi_read_exceeded.
- Compress logs.
- Retain counters of shutdown sessions to dump once per minute.
- Use standard uintN_t types for portability.

* Wed Dec 1 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.12
- The "This time, for sure!" release.
- Fix throttlectl plugin argument parsing.

* Wed Dec 1 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.11
- Don't send a RADIUS start record when ungardening on shutdown.

* Wed Dec 1 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.10
- Fix byte ordering of LCP header length (thanks Yuri).
- Increase ip_conntrack_max due to dropped packets.

* Tue Nov 30 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.9
- Revise CCP, send ConfigReq once only.
- Don't copy the old buffer into Config{Nak,Rej} LCP responses (oops);
  add length checks when appending.
- Do copy the identifier from the request and update length.
- Have makeppp print a backtrace on overflow.
- Check control serial before clearing window, prevents looping tunnel
  setup in some instances.
- Implement named access-lists which may be applied to a session
  either via Filter-Id RADIUS responses, or using the CLI.
- Drop ip address from LOG.
- autothrottle: revise parsing; ignore lcp:interface-config avpairs
  which don't start with serv[ice-policy].
- Add THANKS file.

* Sat Nov 20 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.8
- Ignore gateway address in Framed-Route (from Jonathan McDowell).
- Don't route Framed-IP-Address if contained in a Framed-Route.
- Call sessionshutdown() when a tunnel is dropped rather than
  sessionkill() to ensure that RADIUS stop records are sent.
- Cleanup: make a bunch of global functions/variables static.
- Remove reference to old -a command line argument.
- Add l2tpns(8) and nsctl(8) manpages from Jonathan McDowell.
- Add startup-config(5) manpage.
- Revise nsctl to allow arbitrary strings/args to be passed to plugins.
- Add snoopctl, throttlectl plugins.
- Fix deletion from linked list.
- Allow LCP re-negotiation after connection completes (thanks Yuri).

* Mon Nov 15 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.7
- Fix socket creation in host_unreachable() (thanks to Bjørn Augestad)
- Don't assume BGP peer sends back negotiated hold time, pick smallest

* Thu Nov 11 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.6
- Make BGP keepalive/hold time configurable
- Revise BGP config to use "router bgp AS" syntax (requires libcli >= 1.8.2)

* Tue Nov 9 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.5
- Handle routing properly in lone-master case
- Fix intercepts:  don't double-snoop throttled customers, ensure
  byte/packet counts are only updated once
- Add a callback to allow plugins to fetch values from the running config

* Mon Nov 8 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.4
- Added setrxspeed plugin
- Added peer_address config option
- Rename wrapper macros to LOG()/LOG_HEX(), use p->log() in plugins
- Replace some PPP{PAP,CHAP} magic numebrs with constants
- Nak asyncmap (unless == 0)
- Bundle ConfigRej options
- Clean up initlcp handling

* Wed Nov 3 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.3
- Added support for hidden AVPs by Robert Clark
- l2tpns-chap-response.patch from Robert Clark
- Merge l2tpns-config-hostname.patch from Robert Clark
- l2tpns-dont-timeshift-unidirectional-traffic.patch from Robert Clark - Dump accounting data if cin OR cout is non-zero
- Don't write accounting files if no accounting dir is set - Yuri
- Fix checking for mmap success
- Renegotiate MRU - Yuri
- Take LCP ConfigReq length from the packet length field - Yuri
- Hostname set via command line not config
- Make number of throttle buckets configurable
- Shared_malloc returns NULL on failure
- Sync changes
- Unfsck 4->8 indenting change
- Use 2 seperate u16 values for throttle rate in/out
- Defer adding radius fds to the select loop until become_master

* Thu Sep 02 2004 David Parrish <david@dparrish.com> 2.0.2
- Combined LCP patches from Iain and Yuri. This should allow Windows 2k/XP
  clients to connect, as well Linksys DSL modems.
- Apply patch to fix -v option from Juergen Kammer.
- Makefile fix from Juergen Kammer to not overwrite existing config files on
  make install
- Configurable radius port patch from Juergen Kammer.
- Send my_address if no bind_address when doing IPCP
- Write pid file if filename is set
- Add startup script and monitor script from Yuri
- Some logging correctness fixes from Iain Wade
- Add support for LCP Ident and CallBack (rejection only) from Yuri
- Initiate LCP if not attempted by the client, or in renegotiation - Yuri
- Indentation and style cleanups
- Per-user upload and download throttle rates - Yuri
- Make autothrottle.so understand cisco lcp:interface-config - Yuri
- Show filter stats in show session - Yuri
- Cleanup from Michael to change sid to unique_id
- Add plugin to remove domain name from auth requests
- Add .spec file for RPM generation

* Tue Jul 13 2004 Brendan O'Dea <bod@optusnet.com.au> 2.0.1
- Update INSTALL, Docs/manual.html documentation.
- Add INTERNALS documentation.
- Add lock_pages option.
- TerminateAck fix from Yuri
- Adject cli_loop args for libcli 1.8.0
- Allow for backward compatabity in C_PING packets
- Don't send RADIUS stop messages from sessionshutdown when called from
  sessionkill.
- s/tap/tun/ .
- Fix for LASTSEEN breakage:  don't do anything in the CLI other than
  flag changes to be made by the parent.
- Split out master parts from cluster_check_master() into cluster_check_slaves().
- Set hostname in CLI prompt.
- Make cluster_hb_interval work; include interval/timeout in heartbeats
  so that a change on the master is propagated immediately to the slaves.
- Use fast heartbeats when there are slaves not up to date.
- Ensure basetime of shut down master is set to zero (prevent delayed election).
- Fix radius session leak on IPCP timeout.
- Fix some off-by-one errors in tunnel/session loops.
- Add "limp along" fix for when a slave drops temporarily from the mcast group.
- Rename l2tpns.cfg as startup-config to match CONFIGFILE.
- Update cli callbacks to work with libcli 1.6.
  This supports privileged and unprivileged commands, as well as a configuration
  mode.
- Add help for all cli commands.
- Add "show version" command.
- Fix uptime counter display.
- Fix nasty bug where cluster basetime can be set to 0 when sending initial
  heartbeat.
- Don't rmmod ip_conntrack, as this can take a lot of time.
- Re-order logging in routeset such that the action is given before any error.
- Use the correct gateway address when deleting routes.
- Remove any routes when address changes.
- Require authentication if telnet from remote ip.
- Require enable password always.
- Return error if show pool done on slave.
- We MUST immediately exit if we're the wrong master!

* Wed Jun 23 2004 David Parrish <david@dparrish.com> 2.0.0
- Major release
- Completely replace active/standby clustering with a new peer-to-peer
  clustering method which allows much greater throughput and is a lot more fault
  tolerant
- Add internal tbf implementation for throttling without relying on tc and
  kernel HTB
- Add support for iBGP and eBGP to advertise routes
- Add cli commands "show cluster", "show bgp", "show ipcache", "show throttle",
  "show tbf", "suspend bgp", "restart bgp", "show user"
- Interception destination must be set per-user
- If SMP machine, allow use of SCHED_FIFO, which should improve performance
- Added config option to send GARP at startup
- Added plugin_become_master and plugin_new_session_master plugin hooks
- Remove useless sessionsendarp(). This isn't needed now that we are using TUN
  instead of TAP.
- ICMP rate limiting so not every unreachable packet is replied with an ICMP
  unreachable message
- mangle table is not required on anything but the cluster master, so slaves
  will drop the mangle table and attempt to unload the ip_conntrack module
- Statically assigned IP addresses (by Radius) work now
- Add -d command-line flag to detach and become a daemon
- Configuration file is now "/etc/l2tpns/startup-config"
- Reduced MIN_IP_SIZE to 0x19 to stop a pile of Short IP warnings
- Resend initial IPCP request until it's acknowleged by the client
- Better radius session cleanup logic
- Many miscellaenous bugfixes and performance enhancements
- Thanks to Michael O'Reilly and Brendan O'Dea for most of these new features

* Mon May 24 2004 David Parrish <david@dparrish.com> 1.2.0
- Fix SEGFAULT in garden module
- Use multiple radius sockets to allow more concurrent authentication requests
- Add username parameter to "show users" command
- Fix counting tunnel rx errors as tunnel tx errors
- Add "show throttle" command
- Add gcc __attribute__ to logging functions
- Fix warnings shown by __attribute__
- Make sure regular cleanup happens regularly under high load
- Add variable cleanup_interval for changing cleanup interval
- Add support for reading more than one packet per fd in each processing loop
- This is configurable with the multi_read_count variable
- Remove segv handler so core dumps can happen
- Use nonblocking sockets
- Increase tun queue length
- Fix minimum length of IP packets
- Remove per-packet plugin hooks (they are slow)
- Don't drop session if no free RADIUS
- Don't expire more than 1000 sessions per cleanup interval
- Remove -a and -c command-line options. They don't work anyway
- Don't require file: in log_filename
- Bump version to 1.2.0
- Check return code when throttling users

* Mon Apr 5 2004 David Parrish <david@dparrish.com> 1.1.1
- Don't mention configure anymore, it's not used
- Added the autosnoop and autothrottle modules
- Don't default to using a htb for the class root

* Fri Mar 5 2004 David Parrish <david@dparrish.com> 1.1.0
- Change all strcpy() calls to strncpy() to avoid buffer overflow potential
- Add ICMP host unreachable support
- Logging to syslog if log_file = "syslog:facility"
- Now requires libcli 1.5
- All configuration moves to a config structure
- Ability to modify and write config on the fly through command-line interface
- Config file support is removed, and now handled by the cli
- Show hostname in cli prompt
- Keep current state type for tunnels
- Add uptime command do CLI, which also shows real-time bandwidth utilisation
- Add goodbye command to cluster master, which forces droppping a slave
- Cache IP address allocation, so that reconnecting users get the same address
- Fix tunnel resend timeouts, so that dead tunnels will be cleaned up
- Allocate tunnels and radius without using a linked list which had issues
- Fix some off-by-one errors in tunnel and session and radius arrays
- Save and reload ip address pool when dieing
- Check version and size of reloaded data when restarting
- Remove plugin_config support
- Remove old support for TBF which didn't work anyway. HTB is required to do throttling now.
- Add COPYING and Changes files