Commit graph

403 commits

Author SHA1 Message Date
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)
4c6ee53f31 BGP: Make routing loops silent
One of previous commits added error logging of invalid routes. This
also inadvertently caused error logging of route loops, which should
be ignored silently. Fix that.
2022-01-28 18:13:18 +01:00
Ondrej Zajicek (work)
963b2c7ce2 BGP: Use proper class in attribute error messages
Most error messages in attribute processing are in rx/decode step and
these use L_REMOTE log class. But there are few that are in tx/export
step and these should use L_ERR log class.

Use tx-specific macro (REJECT()) in tx/export code and rename field
err_withdraw to err_reject in struct bgp_export_state to ensure that
appropriate error reporting macros are called in proper contexts.
2022-01-28 05:35:22 +01:00
Ondrej Zajicek (work)
75d01ecc2d BGP: Improve 'invalid next hop' error reporting
Distinguish multiple causes of 'invalid next hop' message and report
the relevant next hop address.

Thanks to Simon Ruderich for the original patch.
2022-01-28 05:03:03 +01:00
Ondrej Zajicek (work)
9dbb7eb6eb BGP: Log route updates that were changed to withdraws
Typical BGP error handling is treat-as-withdraw, where an invalid route
is replaced with a withdraw. Log route network when it happens.
2022-01-24 03:44:21 +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
Ondrej Zajicek (work)
91d0458389 BGP: Ensure that freed neighbor entry is not accessed
Routes from downed protocols stay in rtable (until next rtable prune
cycle ends) and may be even exported to another protocol. In BGP case,
source BGP protocol is examined, although dynamic parts (including
neighbor entries) are already freed. That may lead to crash under some
race conditions. Ensure that freed neighbor entry is not accessed to
avoid this issue.
2021-06-01 02:20:26 +02:00
Ondrej Zajicek (work)
7a74ad5a61 BGP: Do not keep BAF_EXT_LEN flag internally
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.
2021-03-30 16:59:11 +02:00
Ondrej Zajicek (work)
5a6e8380f8 BGP: Do not show statistics
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.
2021-03-18 15:44:04 +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)
d774f6d721 MRT: Fix IPv6 table dumps
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.
2021-01-12 15:37:01 +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)
2465867712 BGP: Zero the newly allocated bucket structure
This fixes an issue with dirty node passed to add_tail().

Thanks to Andreas Rammhold for the initial patch.
2020-11-25 15:48:22 +01:00
Ondrej Zajicek (work)
c9ae81656f Some minor sl_allocz() cleanups 2020-11-24 03:21:44 +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
Maria Matejka
048eb2ddf1 Merge remote-tracking branch 'origin/mq-static-analysis' 2020-05-01 15:34:17 +02:00
Maria Matejka
258be56539 Nest: Added const to ea_show just to declare that this shouldn't really change anything 2020-05-01 15:19:12 +02:00
Ondrej Zajicek (work)
17de3a023f BGP: Fix handling of strange IPv6 link-local-only next hops
There are three common ways how to encode IPv6 link-local-only next hops:
(:: ll), (ll), and (ll ll). We use the first one but we should accept all
three. The patch fixes handling of the last one.

Thanks to Sebastian Hahn for the bugreport.
2020-04-29 02:50:29 +02:00
Maria Matejka
d607205486 Not calling memcpy with n=0. 2020-04-28 16:21:06 +02:00
Nasato Goto
a6548d5b5b BGP: Fix handling of 16bit-only ASN translation
The bug generated invalid AGGREGATOR attribute during translation of
32bit ASN to 16bit-only BGP peer. The patch fixes that.
2020-04-15 03:46:53 +02:00
Maria Matejka
fd9f0c0640 Configuration strings are constant.
This is merely a const propagation. There was no problem in there.
2020-04-09 15:37:14 +02:00
Ondrej Zajicek (work)
78e4a123bb BGP: Handle flowspec rules without dst part
The RFC 5575 does not explicitly reject flowspec rules without dst part,
it just requires dst part in validation procedure for feasibility, which
we do not implement anyway. Thus flow without dst prefix is syntactically
valid, but unfeasible (if feasibilty testing is done).

Thanks to Alex D. for the bugreport.
2020-03-03 17:45:16 +01:00
Ondrej Zajicek (work)
757cab18d6 BGP: Support for MD5SIG together with remote range
When dynamic BGP with remote range is configured, MD5SIG needs to use
newer socket option (TCP_MD5SIG_EXT) to specify remote addres range for
listening socket.

Thanks to Adam Kułagowski for the suggestion.
2020-02-27 17:29:17 +01:00
Ondrej Zajicek (work)
21d09632a5 BGP: Add some statistics
Add some statistic counters to BGP consistent with BGP MIB (RFC 4273),
including persistent 'FSM established transitions'.
2019-12-03 18:05:41 +01:00
Ondrej Zajicek (work)
0f88200247 BGP: Fix processing of IPv6 Flowspec
During NLRI parsing of IPv6 Flowspec, dst prefix was not properly
extracted from NLRI, therefore a received flow was stored in a different
position in flowspec routing table, and was not reachable by command
'show route <flow>'.

Add proper prefix part accessors to flowspec code and use them from BGP
NLRI parsing code.

Thanks to Alex D. for the bugreport.
2019-11-18 17:56:51 +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)
be7c1aef42 BGP: RFC 8654 got released 2019-10-26 01:32:24 +02:00
Ondrej Zajicek (work)
ec331acf48 BGP: Fix handling of transitive extended communities
Transitive extended communities should be removed on external sessions,
the old code them in all cases.

Thanks to Jean-Daniel Pauget for the original patch.
2019-10-24 17:50:19 +02:00
Ondrej Zajicek (work)
6c9cda6f92 BGP: Fix reconfiguration with import table
Change of some options requires route refresh, but when import table is
active, channel reload is done from it instead of doing full route
refresh. So in this case we request it internally.
2019-10-10 23:33:40 +02:00
Ondrej Zajicek (work)
09ee846d92 BGP: AIGP metric support (RFC 7311) 2019-10-09 17:53:23 +02:00
Ondrej Zajicek (work)
eb1e43a9af BGP: Fix setup with multiple dynamic BGP ranges
Based on a patch from Liam Nattrass, thanks.
2019-09-17 14:45:14 +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)
8388f5a7e1 BGP: Fix bugs in handling of shutdown messages
There is an improper check for valid message size, which may lead to
stack overflow and buffer leaks to log when a large message is received.

Thanks to Daniel McCarney for bugreport and analysis.
2019-09-09 03:13:35 +02:00
Ondrej Zajicek (work)
4fa0e472cf BGP: Use reallocation for capability structure
Instead of having large stack buffer for max amount of AFI/SAFI pairs.
The old code is not correct w.r.t. extendeded option length, as more
AFI/SAFI pairs may fit into the capability option.
2019-08-21 17:16:08 +02:00
Ondrej Zajicek (work)
524d253853 BGP: Implement extended optional parameters length
Extends BGP options/capabilities data length to 16bit, to avoid issues
with too many capabilities. See draft-ietf-idr-ext-opt-param-07
2019-08-20 19:15:50 +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)
e2b530aa72 BGP: Improve reconfiguration
Several BGP channel options (including 'next hop self') could be
reconfigured without session reset, with just route refeed/refresh.
The patch improves reconfiguration code to do it that way.
2019-08-06 15:29:06 +02:00
Ondrej Zajicek (work)
f6a6a77640 BGP: Fix 'deterministic med' to work with 'merge paths'
The 'deterministic med' option is implemented by suppressing other than
best-in-group routes (grouped by ASN) from best route selection. This
interferes with 'merge paths' as supressed routes are no longer mergable
with best route. This is fixed by suppressing only those routes that are
not mergable with best-in-group route.
2019-08-06 15:09:42 +02:00
Ondrej Zajicek (work)
cec40a7467 Merge remote-tracking branch 'origin/mq-filter-stack' 2019-07-24 15:38:32 +02:00
Ondrej Zajicek (work)
15b0a92294 RPKI: Fix reconfiguration when ssh parameters are undefined 2019-07-23 01:52:18 +02:00
Ondrej Zajicek (work)
cf7ff99513 BFD: Support for VRFs
Allow multiple BFD instances in separate VRFs, dispatch BFD requests
according to VRFs.

Thanks to Alexander Zubkov for notice and patches.
2019-07-17 16:20:35 +02:00
Maria Matejka
eac9250fd5 Merge branch 'master' into mq-filter-stack 2019-07-03 11:12:25 +02:00
Maria Matejka
78976974e7 Dynamic attributes definition split whether it is bitmask or not. 2019-07-03 00:00:11 +02:00
Maria Jan Matejka
026bfedb33 BGP: Prefix hash is too small, increase its max size.
This doesn't make any change for you until you have
millions of updates waiting to be sent. Increasing
the max hash size from 2^20 to 2^24.
2019-07-01 09:05:54 +02:00
Maria Jan Matejka
9dac814ee8 BGP: split tx explicitly
If BGP has too many data to send and BIRD is slower than the link, TX is
always possible until all data is sent. This patch limits maximum number
of generated BGP messages in one iteration of TX hook.
2019-07-01 09:05:50 +02:00
Ondrej Zajicek (work)
8a68316eb9 Nest: Add command to request graceful restart
When 'graceful down' command is entered, protocols are shut down
with regard to graceful restart. Namely Kernel protocol does
not remove routes and BGP protocol does not send notification,
just closes the connection.
2019-06-30 21:29:24 +02:00
Ondrej Zajicek (work)
d35fb9d732 BGP: Fix bug introduced in one of last patches 2019-06-12 16:37:12 +02:00