BIRD uses hacked LinuxDocTools for building documentation, keeping some
parts locally and using remaining parts from system-installed one. This
setup breaks when LinuxDocTools makes some internal changes and is hard
to keep consistent.

Just include full LinuxDocTools code (both hacked and unmodified parts)
to avoid consistency issues. Note that we still need some binaries from
LinuxDocTools, so it still needs to be installed to build documentation.

/misc/docker/:
+ debian 11 (i386+amd64) added,
+ fedora 32 added,
+ fedora 33 added,
+ fedora 34 added,
+ opensuse 15.2 added,
+ opensuse 15.3 added,
+ ubuntu 20.04 added,
+ ubuntu 20.10 added,
+ ubuntu 21.04 added,
- ubuntu 19.10 removed.

/.gitlab-ci.yml:
+ stages 'image' and 'build' updated.

This fixes an internal table cleanup bug introduced
in ff397df7.

Stefan Haller authored 3 years ago and Ondřej Zajíček committed 3 years ago

For logging purposes a stack allocated net_addr struct was passed by
value as vararg (instead of the expected pointer). This resulted in
a segfault when the specific error condition got logged.

The code in tm_format_real_time() mixed up two buffers and their
sizes, which may cause crash in MRT dumping code.

Thanks to Piotr Wydrych for the bugreport.

We support 32bit table and realm/flow ids, we should also accept them as
constants.

Thanks to Patrick Hemmer for the bugreport.

Thanks to Matt Corallo for the bugreport.

This saves some bytes of memory for complex ea's.

This also fixes memory leaks from import/export tables being never
cleaned up and freed.

The flag makes sense just in external representation. It is reset during
BGP export, but keeping it internally broke MRT dumps for short attributes
that used it anyways.

Thanks to Simon Marsh for the bugreport and the patch.

Debian 7 Wheezy has been superseded by Debian 8 Jessie on Apr 25, 2015,
with LTS support ending on May 31, 2018.

Debian 7 Wheezy's default GCC doesn't fully support C11. It should
anyway still be possible to build BIRD for Debian 7 if you backport
a C11-capable compiler there.

From now, there are no auxiliary pointers stored in the free slab nodes.
This led to strange debugging problems if use-after-free happened in
slab-allocated structures, especially if the structure's first member is
a next pointer.

This also reduces the memory needed by 1 pointer per allocated object.
OTOH, we now rely on pages being aligned to their size's multiple, which
is quite common anyway.

BGP statistics code was preliminary and i wanted to replace it by
separate 'show X stats' command. The patch hides the preliminary
output in 'show protocols all' so it is not part of the released
version.

Pipe channels are kind-of implicit, so setting protocol debug flags
should also set pipe debug flags.

In OSPFv3, only Hello and DBDes packets contain flags specifying whether
RFC 7166 authentication trailer is used. Other packets are processed
based on stored authentication state in neighbor structure. Update this
state with each received Hello to handle authentication change from
reconfigurations.

Thanks to Joakim Tjernlund and Kenth Eriksson for the bugreport.

When a link-local address is set, use the existing iface for scope.

Thanks to Marcel Krüger for the bugreport.

In general, events are code handling some some condition, which is
scheduled when such condition happened and executed independently from
I/O loop. Work-events are a subgroup of events that are scheduled
repeatedly until some (often significant) work is done (e.g. feeding
routes to protocol). All scheduled events are executed during each
I/O loop iteration.

Separate work-events from regular events to a separate queue and
rate limit their execution to a fixed number per I/O loop iteration.
That should prevent excess latency when many work-events are
scheduled at one time (e.g. simultaneous reload of many BGP sessions).

Also, no automatic reload for BGP channels without import/export table.

Vincent Bernat authored 4 years ago and Ondřej Zajíček committed 4 years ago

This is an implementation of draft-walton-bgp-hostname-capability-02.
It is implemented since quite some time for FRR and in datacenter, this
gives a nice output to avoid using IP addresses.

It is disabled by default. The hostname is retrieved from uname(2) and
can be overriden with "hostname" option. The domain name is never set
nor displayed.

Minor changes by committer.

If there are roa_check() calls in channel filters, then the channel
subscribes to ROA table notifications, which are sent when ROA tables
are updated (subject to settle time) and trigger channel reload or
refeed.

Add macros for recursive filter iteration that allows to examine
all instructions reachable from a filter.

Flag signalling that MP-BGP mode should be used got reset after first
batch of routes, so remaining routes were processed without that, leading
to missing MP_REACH_NLRI attribute.

Thanks to Piotr Wydrych for the bugreport.

With net.ipv4.conf.XXX.ignore_routes_with_linkdown sysctl, a user can
ensure the kernel does not use a route whose target interface is down.
Such route is marked with a 'dead' / RTNH_F_DEAD flag.

Ignore these routes or multipath nexthops during scan.

Thanks to Vincent Bernat for the original patch.

Add fake MP_REACH_NLRI attribute with BGP next hop when encoding MRT
table dumps for IPv6 routes. That is necessary to encode next hop as
NEXT_HOP attribute is not used for MP-BGP.

Thanks to Santiago Aggio for the bugreport.

Direct BFD sessions needs to be dispatched not only by IP addresses, but
also by interfaces, in order to avoid collisions between neighbors with
the same IPv6 link-local addresses.

Extend BFD session hash_ip key by interface index to handle that. Use 0
for multihop sessions.

Thanks to Sebastian Hahn for the original patch.

It was mixed-up if hostname is IPv6 address, and reporting separate
values (like port) on separate lines fits better into key-value style
of 'show protocols all' output. Also, the patch simplifies transport
identification formatting (although it is unused now).

Thanks to Alarig Le Lay for the suggestion.

So one can define kernel protocol template without channels.
For other protocols, it is either irrelevant or already done.

Thanks to Clemens Schrimpe for the bugreport.

Also remove description of (no longer supported) per-route 'bfd' option,
and add examples of IPv6 routes with link-local nexthops.