Further updates to README for 2.5.0 release

History from the 2.4.x series is moved to Changes-2.4.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

Changes-2.4

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+What's new in ppp-2.4.9.
+************************
+
+* Support for new EAP (Extensible Authentication Protocol) methods:
+  - Support for EAP-TLS, from Jan Just Keijser and others
+  - Support for EAP-MSCHAPv2, from Eivind Næss, Thomas Omerzu, Tijs
+    Van Buggenhout and others
+
+* New pppd options:
+  - chap-timeout
+  - chapms-strip-domain
+  - replacedefaultroute
+  - noreplacedefaultroute
+  - ipv6cp-accept-remote
+  - lcp-echo-adaptive
+  - ip-up-script
+  - ip-down-script
+  - ca
+  - capath
+  - cert
+  - key
+  - crl-dir
+  - crl
+  - max-tls-version
+  - need-peer-eap
+
+* Fixes for CVE-2020-8597 and CVE-2015-3310.
+
+* libpcap is now required when compiling on Linux (previously, if
+  libpcap was not present, pppd would be compiled without packet
+  filtering support).
+
+* The rp-pppoe plugin has been renamed to pppoe, to distinguish it
+  from the upstream rp-pppoe code.  Its options have changed names,
+  but the old names are kept as aliases.
+
+* The configure script now supports cross-compilation.
+
+* Many bug fixes and cleanups.
+
+
+What was new in ppp-2.4.8.
+**************************
+
+* New pppd options have been added:
+  - ifname, to set the name for the PPP interface device
+  - defaultroute-metric, to set the metric for the default route
+  - defaultroute6, to add an IPv6 default route (with nodefaultroute6
+    to prevent adding an IPv6 default route)
+  - up_sdnotify, to have pppd notify systemd when the link is up.
+
+* The rp-pppoe plugin has new options:
+  - host-uniq, to set the Host-Uniq value to send
+  - pppoe-padi-timeout, to set the timeout for discovery packets
+  - pppoe-padi-attempts, to set the number of discovery attempts.
+
+* Added the CLASS attribute in radius packets.
+
+* Sundry bug fixes.
+
+* Fixed warnings and issues found by static analysis.
+
+* Added Submitting-patches.md.
+
+
+What was new in ppp-2.4.7.
+**************************
+
+* Fixed a potential security issue in parsing option files (CVE-2014-3158).
+
+* There is a new "stop-bits" option, which takes an argument of 1 or 2,
+  indicating the number of stop bits to use for async serial ports.
+
+* Various bug fixes.
+
+
+What was new in ppp-2.4.6.
+**************************
+
+* Man page updates.
+
+* Several bug fixes.
+
+* Options files can now set and unset environment variables for
+  scripts.
+
+* The timeout for chat scripts can now be taken from an environment
+  variable.
+
+* There is a new option, master_detach, which allows pppd to detach
+  from the controlling terminal when it is the multilink bundle master
+  but its own link has terminated, even if the nodetach option has
+  been given.
+
+
+What was new in ppp-2.4.5.
+**************************
+
+* Under Linux, pppd can now operate in a mode where it doesn't request
+  the peer's IP address, as some peers refuse to supply an IP address.
+  Since Linux supports device routes as well as gateway routes, it's
+  possible to have no remote IP address assigned to the ppp interface
+  and still route traffic over it.
+
+* Pppd now works better with 3G modems that do strange things such as
+  sending IPCP Configure-Naks with the same values over and over again.
+
+* The PPP over L2TP plugin is included, which works with the pppol2tp
+  PPP channel code in the Linux kernel.  This allows pppd to be used
+  to set up tunnels using the Layer 2 Tunneling Protocol.
+
+* A new 'enable-session' option has been added, which enables session
+  accounting via PAM or wtwp/wtmpx, as appropriate.  See the pppd man
+  page for details.
+
+* Several bugs have been fixed.
+
+
+What was new in ppp-2.4.4.
+**************************
+
+* Pppd will now run /etc/ppp/ip-pre-up, if it exists, after creating
+  the ppp interface and configuring its IP addresses but before
+  bringing it up.  This can be used, for example, for adding firewall
+  rules for the interface.
+
+* Lots of bugs fixed, particularly in the area of demand-dialled and
+  persistent connections.
+
+* The rp-pppoe plugin now accepts any interface name (that isn't an
+  existing pppd option name) without putting "nic-" on the front of
+  it, not just eth*, nas*, tap* and br*.
+
+
+What was new in ppp-2.4.3.
+**************************
+
+* The configure script now accepts --prefix and --sysconfdir options.
+  These default to /usr/local and /etc.  If you want pppd put in
+  /usr/sbin as before, use ./configure --prefix=/usr.
+
+* Doing `make install' no longer puts example configuration files in
+  /etc/ppp.  Use `make install-etcppp' if you want that.
+
+* The code has been updated to work with version 0.8.3 of libpcap.
+  Unfortunately the libpcap maintainers removed support for the
+  "inbound" and "outbound" keywords on PPP links, meaning that if you
+  link pppd with libpcap-0.8.3, you can't use those keywords in the
+  active-filter and pass-filter expressions.  The support has been
+  reinstated in the CVS version and should be in future libpcap
+  releases.  If you need the in/outbound keywords, use a later release
+  than 0.8.3, or get the CVS version from http://www.tcpdump.org.
+
+* There is a new option, child-timeout, which sets the length of time
+  that pppd will wait for child processes (such as the command
+  specified with the pty option) to exit before exiting itself.  It
+  defaults to 5 seconds.  After the timeout, pppd will send a SIGTERM
+  to any remaining child processes and exit.  A value of 0 means no
+  timeout.
+
+* Various bugs have been fixed, including some CBCP packet parsing
+  bugs that could lead to the peer being able to crash pppd if CBCP
+  support is enabled.
+
+* Various fixes and enhancements to the radius and rp-pppoe plugins
+  have been added.
+
+* There is a new winbind plugin, from Andrew Bartlet of the Samba
+  team, which provides the ability to authenticate the peer against an
+  NT domain controller using MS-CHAP or MS-CHAPV2.
+
+* There is a new pppoatm plugin, by various authors, sent in by David
+  Woodhouse.
+
+* The multilink code has been substantially reworked.  The first pppd
+  for a bundle still controls the ppp interface, but it doesn't exit
+  until all the links in the bundle have terminated.  If the first
+  pppd is signalled to exit, it signals all the other pppds
+  controlling links in the bundle.
+
+* The TDB code has been updated to the latest version.  This should
+  eliminate the problem that some people have seen where the database
+  file (/var/run/pppd.tdb) keeps on growing.  Unfortunately, however,
+  the new code uses an incompatible database format.  For this reason,
+  pppd now uses /var/run/pppd2.tdb as the database filename.
+
+
+What was new in ppp-2.4.2.
+**************************
+
+* The CHAP code has been rewritten.  Pppd now has support for MS-CHAP
+  V1 and V2 authentication, both as server and client.  The new CHAP
+  code is cleaner than the old code and avoids some copyright problems
+  that existed in the old code.
+
+* MPPE (Microsoft Point-to-Point Encryption) support has been added,
+  although the current implementation shouldn't be considered
+  completely secure.  (There is no assurance that the current code
+  won't ever transmit an unencrypted packet.)
+
+* James Carlson's implementation of the Extensible Authentication
+  Protocol (EAP) has been added.
+
+* Support for the Encryption Control Protocol (ECP) has been added.
+
+* Some new plug-ins have been included:
+  - A plug-in for kernel-mode PPPoE (PPP over Ethernet)
+  - A plug-in for supplying the PAP password over a pipe from another
+    process
+  - A plug-in for authenticating using a Radius server.
+
+* Updates and bug-fixes for the Solaris port.
+
+* The CBCP (Call Back Control Protocol) code has been updated.  There
+  are new options `remotenumber' and `allow-number'.
+
+* Extra hooks for plugins to use have been added.
+
+* There is now a `maxoctets' option, which causes pppd to terminate
+  the link once the number of bytes passed on the link exceeds a given
+  value.
+
+* There are now options to control whether pppd can use the IPCP
+  IP-Address and IP-Addresses options: `ipcp-no-address' and
+  `ipcp-no-addresses'.
+
+* Fixed several bugs, including potential buffer overflows in chat.
+
+
+What was new in ppp-2.4.1.
+**************************
+
+* Pppd can now print out the set of options that are in effect.  The
+  new `dump' option causes pppd to print out the option values after
+  option parsing is complete.  The `dryrun' option causes pppd to
+  print the options and then exit.
+
+* The option parsing code has been fixed so that options in the
+  per-tty options file are parsed correctly, and don't override values
+  from the command line in most cases.
+
+* The plugin option now looks in /usr/lib/pppd/<pppd-version> (for
+  example, /usr/lib/pppd/2.4.1b1) for shared objects for plugins if
+  there is no slash in the plugin name.
+
+* When loading a plugin, pppd will now check the version of pppd for
+  which the plugin was compiled, and refuse to load it if it is
+  different to pppd's version string.  To enable this, the plugin
+  source needs to #include "pppd.h" and have a line saying:
+	char pppd_version[] = VERSION;
+
+* There is a bug in zlib, discovered by James Carlson, which can cause
+  kernel memory corruption if Deflate is used with the lowest setting,
+  8.  As a workaround pppd will now insist on using at least 9.
+
+* Pppd should compile on Solaris and SunOS again.
+
+* Pppd should now set the MTU correctly on demand-dialled interfaces.
+
+
+What was new in ppp-2.4.0.
+**************************
+
+* Multilink: this package now allows you to combine multiple serial
+  links into one logical link or `bundle', for increased bandwidth and
+  reduced latency.  This is currently only supported under the
+  2.4.x and later Linux kernels.
+
+* All the pppd processes running on a system now write information
+  into a common database.  I used the `tdb' code from samba for this.
+
+* New hooks have been added.
+
+For a list of the changes made during the 2.3 series releases of this
+package, see the Changes-2.3 file.