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Commit Graph

120 Commits

Author SHA1 Message Date
Ondrej Zajicek
9d456d5366 BGP: Add MPLS support
When MPLS is active, received routes on MPLS-aware SAFIs (ipvX-mpls,
vpnX-mpls) are automatically labeled according to active label policy and
corresponding MPLS routes are automatically generated. Also routes sent
on MPLS-aware SAFIs announce local labels when it should be done.
2023-10-04 13:01:21 +02:00
Maria Matejka
8ad9c4bb33 BGP config: Splitting Route Refresh and Enhanced Route Refresh
Both toggles are on by default but if some implementation needs one or
another to be switched off separately, then it's possible now.
2023-09-27 20:18:46 +02:00
katerina.kubecova
a0fb0eaa67 BGP: Setting and unsetting unknown attributes
All these must be declared as bytestring. Allows operators to delete
unwanted attributes breaking the Internet:

    https://blog.benjojo.co.uk/post/bgp-path-attributes-grave-error-handling
2023-09-20 14:15:18 +02:00
Maria Matejka
6f798683a3 Conf: config warnings show the file position 2023-09-12 15:58:07 +02:00
Ondrej Zajicek
f5140d1027 Conf: Allow keywords to be redefined by user symbols
Most syntactic constructs in BIRD configuration (e.g. protocol options)
are defined as keywords, which are distinct from symbols (user-defined
names for protocols, variables, ...). That may cause backwards
compatibility issue when a new feature is added, as it may collide with
existing user names.

We can allow keywords to be shadowed by symbols in almost all cases to
avoid this issue.

This replaces the previous mechanism, where shadowable symbols have to be
explictly added to kw_syms.
2023-08-25 23:50:44 +02:00
Ondrej Zajicek
a8a64ca0fe Conf: Improve handling of keywords
For whatever reason, parser allocated a symbol for every parsed keyword
in each scope. That wasted time and memory. The effect is worsened with
recent changes allowing local scopes, so keywords often promote soft
scopes (with no symbols) to real scopes.

Do not allocate a symbol for a keyword. Take care of keywords that could
be promoted to symbols (kw_sym) and do it explicitly.
2023-04-27 18:41:01 +02:00
Trisha Biswas
9e44ace392 BGP: Add 'allow bgp_med' option for EBGP sessions
This option allows to treat bgp_med as regular transitive attribute
on EBGP sessions (without hacks in filters).

Minor changes from committer.
2023-04-14 04:28:37 +02:00
Ondrej Zajicek
d1cd5e5a63 BGP: Allow role specific keywords to be used as symbols
Some of these new BGP role keywords use generic names that collides with
user-defined symbols. Allow them to be redefined. Also remove duplicit
keyword definition for 'prefer'.
2023-01-03 19:11:34 +01:00
Ondrej Zajicek
3859e4efc1 BGP: Improve handling of hold and keepalive timers
The effective keepalive time now scales relative to the negotiated
hold time, to maintain proportion between the keepalive time and the
hold time. This avoids issues when both keepalive and hold times
were configured, the hold time was negotiated to a smaller value,
but the keepalive time stayed the same.

Add new options 'min hold time' and 'min keepalive time', which reject
session attempts with too small hold time.

Improve validation of config options an their documentation.

Thanks to Alexander Zubkov and Sergei Goriunov for suggestions.
2022-12-09 05:53:24 +01:00
Ondrej Zajicek
8f79e6b93e BGP: Add option 'next hop prefer global'
Add BGP channel option 'next hop prefer global' that modifies BGP
recursive next hop resolution to use global next hop IPv6 address instead
of link-local next hop IPv6 address for immediate next hop of received
routes.
2022-10-10 05:06:19 +02:00
Ondrej Zajicek
971721c9b5 BGP: Minor improvements to BGP roles
Add support for bgp_otc in filters and warning for configuration
inside confederations.
2022-07-12 15:03:17 +02:00
Eugene Bogomazov
c73b5d2d3d BGP: Implement BGP roles
Implement BGP roles as described in RFC 9234. It is  a mechanism for
route leak prevention and automatic route filtering based on common BGP
topology relationships. It defines role capability (controlled by 'local
role' option) and OTC route attribute, which is used for automatic route
filtering and leak detection.

Minor changes done by commiter.
2022-07-11 17:25:54 +02:00
Ondrej Zajicek (work)
53a2540687 Merge branch 'oz-trie-table' 2022-02-06 23:42:10 +01:00
Ondrej Zajicek (work)
1f2eb2aca8 BGP: Implement flowspec validation procedure
Implement flowspec validation procedure as described in RFC 8955 sec. 6
and RFC 9117. The Validation procedure enforces that only routers in the
forwarding path for a network can originate flowspec rules for that
network.

The patch adds new mechanism for tracking inter-table dependencies, which
is necessary as the flowspec validation depends on IP routes, and flowspec
rules must be revalidated when best IP routes change.

The validation procedure is disabled by default and requires that
relevant IP table uses trie, as it uses interval queries for subnets.
2022-02-06 23:27:13 +01:00
Ondrej Zajicek (work)
60e9def9ef BGP: Add option 'free bind'
The BGP 'free bind' option applies the IP_FREEBIND/IPV6_FREEBIND
socket option for the BGP listening socket.

Thanks to Alexander Zubkov for the idea.
2022-01-09 02:44:32 +01:00
Vincent Bernat
714238716e BGP: Add support for BGP hostname capability
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.
2021-02-10 16:53:57 +01:00
Ondrej Zajicek (work)
4155104c90 BGP: Deprecate 'missing lladdr' option
The option is not implemented since transition to 2.0 and no plan to add it.
Also remove some deprecated RTS_* valus from documentation.

Thanks to Sébastien Parisot for notification.
2021-01-06 14:44:23 +01:00
Ondrej Zajicek (work)
3b56bf8849 BFD: Better handling of BFD options in BGP configs
Merge multiple BFD option blocks in BGP configs instead of using the last
one. That is necessary for proper handling of templates when BFD options
are used both in a BGP template and in a BGP protocol derived from that
template.
2020-11-12 04:02:38 +01:00
Ondrej Zajicek (work)
9d3fc3062b BFD: Allow per-request session options
BFD session options are configured per interface in BFD protocol. This
patch allows to specify them also per-request in protocols requesting
sessions (currently limited to BGP).
2020-11-08 15:33:22 +01:00
Ondrej Zajicek (work)
0b228fca04 BGP: Add option to enforce first AS in AS_PATH
This is optional check described in RFC 4271. Although this can be also
done by filters, it is widely implemented option in BGP implementations.

Thanks to Eugene Bogomazov for the original patch.
2019-11-10 02:06:07 +01:00
Ondrej Zajicek (work)
a52476c9be BGP: Add option to reject AS_SETs
There is a pending draft to make them obsolete
2019-11-04 22:09:35 +01:00
Ondrej Zajicek (work)
09ee846d92 BGP: AIGP metric support (RFC 7311) 2019-10-09 17:53:23 +02:00
Ondrej Zajicek (work)
1127887a8b BGP: Fix handling of bgp_aggregator atttribute
The attribute should not be modifiable by filters as we do not
support its type.
2019-09-09 13:17:30 +02:00
Ondrej Zajicek (work)
b7d7599ce3 BGP: implement Adj-RIB-Out
The patch implements optional internal export table to a channel and
hooks it to BGP so it can be used as Adj-RIB-Out. When enabled, all
exported (post-filtered) routes are stored there. An export table can be
examined using e.g. 'show route export table bgp1.ipv4'.
2019-08-14 06:02:33 +02:00
Ondrej Zajicek (work)
e0835db4f1 BGP: Dynamic BGP
Support for dynamically spawning BGP protocols for incoming connections.
Use 'neighbor range' to specify range of valid neighbor addresses, then
incoming connections from these addresses spawn new BGP instances.
2019-04-30 13:32:39 +02:00
Ondrej Zajicek (work)
23ee6b1cd6 BGP: Promiscuous ASN mode
Allow to specify just 'internal' or 'external' for remote neighbor
instead of specific ASN. In the second case that means BGP peers with
any non-local ASNs are accepted.
2019-04-03 15:54:50 +02:00
Ondrej Zajicek (work)
3c3605818f BGP: Mandatory option for channels
Allow to mark channel to be mandatory, and do not allow BGP sessions if
no common AFI/SAFI is established.
2019-03-19 17:44:50 +01:00
Ondrej Zajicek (work)
1cab2b4a7c BGP: Extend 'next hop keep' and 'next hop self' options
Extend 'next hop keep' and 'next hop self' options to have boolean values
(enabled / disabled) and also values 'ibgp'/ 'ebgp' to restrict it to
routes received from IBGP / EBGP. This allows to have it enabled by
default in some cases, matches features of other implementations, and
allows to handle some strange cases like EBGP border router with 'next
hop self' also doing IBGP route reflecting.

Change default of 'next hop keep' to enabled for route servers, and
'ibgp' for route reflectors.

Update documentation for these options.
2018-12-16 23:44:24 +01:00
Ondrej Zajicek (work)
682d3f7de0 BGP: implement Adj-RIB-In
The patch implements optional internal import table to a channel and
hooks it to BGP so it can be used as Adj-RIB-In. When enabled, all
received (pre-filtered) routes are stored there and import filters can
be re-evaluated without explicit route refresh. An import table can be
examined using e.g. 'show route import table bgp1.ipv4'.
2018-12-12 14:46:24 +01:00
Ondrej Zajicek (work)
5bd734317c BGP: Long-lived graceful restart
The patch implements long-lived graceful restart for BGP, namely
draft-uttaro-idr-bgp-persistence-03.
2018-07-31 18:40:38 +02:00
Jan Maria Matejka
f851f0d7e3 Config: Dropping CF_ADDTO. 2018-06-26 14:29:03 +02:00
Jan Maria Matejka
ee7e2ffd26 Protocol: Introducing an enum protocol_class
This supersedes the EAP_* constants.
2018-05-29 12:35:06 +02:00
Ondrej Zajicek (work)
75d98b6013 Merge branch 'master' into int-new 2018-01-23 18:29:32 +01:00
Ondrej Zajicek (work)
63472779ad BGP: Implement 'disable after cease' option
The option allows to specify that some cease subcodes should
disable the protocol when received.
2018-01-16 19:17:04 +01:00
Ondrej Zajicek (work)
3831b61966 BGP: Require explicit import and export policies for EBGP channels
To comply with RFC 8212 requirements.
2018-01-16 04:14:49 +01:00
Ondrej Zajicek (work)
72163bd5f3 Nest: Allow modification of channels inherited from templates
Multiple definitions of same channels are forbidden, but inherited
channel can be redefined. In such case channel options are merged.
2018-01-09 18:42:22 +01:00
Ondrej Zajicek (work)
dea9886454 BGP: Link check just for single-hop 2017-12-08 17:04:59 +01:00
Ondrej Zajicek (work)
517d05dff1 Enable ECMP and Link detection by default
ECMP is not enabled on BSD, where it is not supported by BIRD.
2017-12-08 16:00:33 +01:00
Ondrej Zajicek (work)
e919601aaf Merge master into int-new 2017-04-28 11:19:12 +02:00
Ondrej Zajicek (work)
711d617dc1 BGP: Add support for SAFI 129 (VPN multicast)
Which, in contrast to SAFI 128, does not use MPLS labels.
2017-04-12 16:04:22 +02:00
Ondrej Zajicek (work)
6fe11c9941 BGP: Simplify igp table options 2017-03-29 15:31:04 +02:00
Ondrej Zajicek (work)
ef57b70fa5 BGP: Support for routes with mixed-AF next hops
Covers IPv4/VPNv4 routes with IPv6 next hop (RFC 5549), IPv6 routes with
IPv4 next hop (RFC 4798) and VPNv6 routes with IPv4 next hop (RFC 4659).
Unfortunately it also makes next hop hooks more messy.

Each BGP channel now could have two IGP tables, one for IPv4 next hops,
the other for IPv6 next hops.
2017-03-26 19:20:15 +02:00
Ondrej Zajicek (work)
1e37e35c3e BGP: Support for MPLS labels and VPN SAFI
Basic support for SAFI 4 and 128 (MPLS labeled IP and VPN) for IPv4 and
IPv6. Should work for route reflector, but does not properly handle
originating routes with next hop self.

Based on patches from Jan Matejka.
2017-03-22 18:16:49 +01:00
Ondrej Zajicek (work)
1950a479c0 BGP: Allow exchanging LOCAL_PREF with eBGP peers
Adds option 'allow bgp_local_pref' to override the usual restriction of
LOCAL_PREF on eBGP sessions.

Thanks to Lennert Buytenhek for the patch.
2017-02-23 16:32:07 +01:00
Ondrej Zajicek (work)
d8022d26fc BGP: Partial support for IPv4 routes with IPv6 next hop (RFC 5549)
Mostly capability signalling
2017-01-24 02:00:35 +01:00
Ondrej Zajicek (work)
f8aad5d5b7 Minor cleanups 2017-01-03 16:30:27 +01:00
Ondrej Zajicek (work)
ac3ad139f6 BGP: Add support for flowspec (RFC 5575) 2016-12-07 18:29:34 +01:00
Ondrej Zajicek (work)
d15b0b0a1b BGP redesign
Integrated and extensible BGP with generalized AFI handling,
support for IPv4+IPv6 AFI and unicast+multicast SAFI.
2016-12-07 14:20:52 +01:00
Ondrej Zajicek (work)
8860e991f6 Merge branch 'master' into int-new 2016-11-08 19:27:58 +01:00
Ondrej Zajicek (work)
66dbdbd993 BGP: Support for large communities
Add support for large communities (draft-ietf-idr-large-community),
96bit alternative to RFC 1997 communities.

Thanks to Matt Griswold for the original patch.
2016-10-03 12:48:56 +02:00