November 2018 - Bird-users

Adding more then one bgp community at once
by Борис Коваленко 05 May '23

05 May '23

Hello! Is this possible to add many communites at once? bgp_community.add([(1,1), (1,2)]) is wrong "Setting clist attribute to non-clist value" Regards, Boris -- С уважением, Борис Коваленко

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[PATCH] feature to keep protocol's state while configuring
by Alexander Zubkov 29 Jan '23

29 Jan '23

Hello. I have created a patch (attached) with new protocol option: disabled keep on|off. To keep the protocol's state while loading new config. It is useful when protocols disabled manually in the runtime, but we want to keep that state when loading new config. Patch is attached. I have made it against the current int-new branch.

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Bug: BFD confuses sessions with identical IPv6 link-local addresses
by Julian Brost 14 Jan '21

14 Jan '21

Hi, I just tried to enable BFD for some OSPF and BGP connections and ran into an issue which BFD sessions flapping up and down and Bird logging many messages like these: bfd1: Bad packet from fe80::2 - unknown session id (130079069) bfd1: Bad packet from fe80::2 - unknown session id (3102513000) bfd1: Bad packet from fe80::2 - unknown session id (3650438750) bfd1: Bad packet from fe80::2 - unknown session id (1597034259) This presumably happens due to this piece of code in bfd_rx_hook() in proto/bfd/packets.c: s = bfd_find_session_by_addr(p, sk->faddr); I use fe80::1/fe80::2 as addresses for most of my IPv6 peering connections and sk->faddr is just a 128 bit value, so it contains no interface identifier, which likely leads to Bird confusing multiple BFD sessions. Regards, Julian

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[PATCH] babel: Set onlink flag for IPv4 routes with unreachable next hop
by Toke Høiland-Jørgensen 14 Apr '20

14 Apr '20

If the next hop of a route is not a reachable address, the route should be installed as onlink. This enables a configuration common in mesh networks where the mesh interface is assigned a /32 and babel handles the routing by installing onlink routes. Signed-off-by: Toke Høiland-Jørgensen <toke(a)toke.dk> --- proto/babel/babel.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/proto/babel/babel.c b/proto/babel/babel.c index 88c4711e..4fd88042 100644 --- a/proto/babel/babel.c +++ b/proto/babel/babel.c @@ -640,6 +640,13 @@ babel_announce_rte(struct babel_proto *p, struct babel_entry *e) .nh.iface = r->neigh->ifa->iface, }; + /* If we cannot find a reachable neighbour, set the entry to be onlink. This + * makes it possible to, e.g., assign /32 addresses on a mesh interface and + * have routing work. + */ + if (!neigh_find2(&p->p, &r->next_hop, r->neigh->ifa->iface, 0)) + a0.nh.flags = RNF_ONLINK; + rta *a = rta_lookup(&a0); rte *rte = rte_get_temp(a); rte->u.babel.seqno = r->seqno; -- 2.17.0

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Bird 1.6.3 removing IPv6 device routes on Linux (3.10.0)
by Ben Arblaster 12 Oct '19

12 Oct '19

Hi, I’m seeing an issue with bird 1.6.3 where IPv6 device routes are unexpectedly removed from the kernel table on Linux (3.10.0, CentOS 7) when bird removes a matching route learned via another protocol (in this case OSPF). To reproduce, I’ve rigged up a very simple test with two bird6 instances running OSPF in a single area 0 over a ptp tunnel. Configs are here - https://gist.github.com/andatche/ca5b5ac120e09b6b8171ec5ca95d2e25 If I add an address/network (e.g. fd00::1/64) to an interface (dummy0) on host A, the route is flooded by A, learned by B and correctly installed in the kernel table on B: fd00::/64 via fe80::5efe:ae2:b006 dev tun0 proto bird metric 1024 If I then add the same address/network (e.g. fd00::1/64) to an interface (dummy0) on host B, at that instant a device route is installed in the kernel table alongside the existing route on host B and it now looks like this: fd00::/64 dev dummy0 proto kernel metric 256 fd00::/64 via fe80::5efe:ae2:b006 dev tun0 proto bird metric 1024 Shortly after, bird picks up the new address/network on dummy0, recalculates the area and correctly selects the connected route as the new best. It then removes the old route via host A from the kernel table, as expected: kernel1 < removed fd00::/64 via fe80::5efe:ae2:b006 on tun0 However, this causes both the route via host A *and* the device route to be removed from the kernel table, leaving the kernel table on host B with no route to fd00::/64 at all. # ip -6 route show fd00::/64 # This is a change in behaviour from 1.4.5 and seems like a bug, rather than the expected behaviour? Regards, Ben -- Ben Arblaster e: ben(a)andatche.com t: +447943860840 w: https://andatche.com

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For developer, required some explanation on code with timer and BGP
by Mattia Milani 06 Apr '19

06 Apr '19

Hello all, this is a message for developer and who know how bird use timer, and buffer. Sorry for the length of this mail. For first, the protocol i want to modify and upgrade is BGP, i see that there isn't the timer MRAI implemented and it will be useful for some studies on information propagation, so i decided to develop a first version of it. The actual process to send any kind of pkt is to call the function bgp_fire_tx() and it's called by two other function respectively bgp_kick_tx() and bgp_tx() and the function bgp_fire_tx() take care to read from the buffer the message that has to be sent and send it. bgp_kick_tx() and bgp_tx() call bgp_fire_tx() while it don't return 0, so the clear all the buffer of the message that has to be sent. So my idea to introduce MRAI was that: Create a timer (for now I created it for connection, after like say RFC 4271 this timer has to be set for every route) and put it on the connection. Initialize it with the other timer of the conn when the state of the conn goes up i set it to some value and start the timer. when the timer finish i call the function MRAI_finish() that call the function bgp_fire_tx() while there is something to send more ore less like the while loop in bgp_kick_tx() and bgp_tx() when it's called bgp_fire_tx() on the update message part i written a check, if the timer isn't at 0 i can't send the update, because the function can be called from bgp_kick_tx() or bgp_tx(), but if it 0 it is finished so i can send the message When all the message had been send i reset the timer and start it again. But unfortunately i see something that doesn't make my code work. when something call bgp_kick_tx() or bgp_tx() the call bgp_fire_tx() and they clear all the buffer, including update message that wasn't sended so when the timer finish it didn't found anything on the buffer. Now how can i change that? My idea is to use a secondary buffer, when in bgp_fire_tx() i see that i can't send the update I will insert the pkt in this secondary buffer and consume the pkt on the main buffer. when bgp_kick_tx() or bgp_tx() have send all the messages I will transfer all the pkt in the secondary buffer into the main buffer. So I ask you it's possible that? there is something in the code already written that could help me? do you see another way to implement the MRAI timer? Thanks a lot to everyone, Mattia

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BIRD 2.0.2 documentation build failure
by Robert Scheck 11 Dec '18

11 Dec '18

Hello, I'm trying to build the documentation of BIRD 2.0.2 on Fedora and RHEL/ CentOS 7 which fails like this: --- snipp --- + /usr/bin/make -j4 -C doc make: Entering directory `/builddir/build/BUILD/bird-2.0.2/doc' make: Leaving directory `/builddir/build/BUILD/bird-2.0.2/doc' make: *** No rule to make target `/tools/progdoc', needed by `prog.sgml'. Stop. --- snapp --- When I decided to replace "$(srcdir)" in doc/Makefile by ".." it goes further, but still fails. Replacing "$(objdir)" by "../obj" and finally replacing "$(doc-srcdir)" by "." leads to the message that bird.sgml has a loop reference (which leads to an empty bird.sgml). And when removing this target, $(o)%.sgml: $(s)%.sgml $(objdir)/.dir-stamp cp $< $@ the documentation build even succeeds. In total that's then this diff: --- snipp --- --- bird-2.0.2/doc/Makefile 2018-01-16 10:46:06.000000000 +0100 +++ bird-2.0.2/doc/Makefile.doc 2018-11-25 16:38:22.988423717 +0100 @@ -1,7 +1,7 @@ # Force rebuilds .PHONY: progspell docs progdocs userdocs -doc-srcdir := $(shell cd $(s) && pwd) +doc-srcdir = . sgml2 := $(doc-srcdir)/sgml2 docs: progdocs userdocs @@ -16,11 +16,8 @@ userdocs: $(o)bird.html $(o)bird.pdf progspell: $(o)prog.spell -$(o)prog.sgml: $(srcdir)/tools/progdoc $(objdir)/.dir-stamp - $(srcdir)/tools/progdoc $(srcdir) $@ - -$(o)%.sgml: $(s)%.sgml $(objdir)/.dir-stamp - cp $< $@ +$(o)prog.sgml: ../tools/progdoc ../obj/.dir-stamp + ../tools/progdoc .. $@ $(o)%.html: $(o)%.sgml cd $(dir $@) && $(sgml2)html $(notdir $<) --- snapp --- Do you have any pointers? Is this a bug in BIRD or is this a Fedora/RHEL build system issue? Regards, Robert

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Bird 2.0 in ubuntu
by marcelo henrique 30 Nov '18

30 Nov '18

I would like upgrade bird, in moment i am using bird 1.6 with ubuntu. Someone already compiled package bird 2.0 for ubuntu ? I searched this but not found . Thanks a lot

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Counting prefered routes for a protocol with bird2
by Alarig Le Lay 29 Nov '18

29 Nov '18

Hi, With bird1, I can know how much routes are used for each protocol just by parsing birdc: [alarig@nominoe ~]$ birdc show protocols all bgp_breizhix | grep 'Routes:' Routes: 75 imported, 0 filtered, 4 exported, 73 preferred With bird2, I don’t see this information: [alarig@budic ~]$ birdc -r show protocols all bgp_breizhix_ipv4 BIRD 2.0.2 ready. Access restricted Name Proto Table State Since Info bgp_breizhix_ipv4 BGP --- up 2018-11-21 Established Description: BreizhIX BGP state: Established Neighbor address: 185.1.89.1 Neighbor AS: 206165 Neighbor ID: 185.1.89.1 Local capabilities Multiprotocol AF announced: ipv4 Route refresh Graceful restart 4-octet AS numbers Enhanced refresh Neighbor capabilities Multiprotocol AF announced: ipv4 Route refresh Graceful restart 4-octet AS numbers Enhanced refresh Session: external AS4 Source address: 185.1.89.13 Hold timer: 216.225/240 Keepalive timer: 12.810/80 Channel ipv4 State: UP Table: master4 Preference: 100 Input filter: bgp_filter_breizhix_in_ipv4 Output filter: (unnamed) Receive limit: 800000 Action: block Export limit: 4 Action: block Routes: 75 imported, 0 filtered, 4 exported Route change stats: received rejected filtered ignored accepted Import updates: 90 0 0 0 90 Import withdraws: 15 0 --- 0 15 Export updates: 5738200 88 5738108 --- 4 Export withdraws: 155358 --- --- --- 0 BGP Next hop: 185.1.89.13 The only way I found is by using 'show route count primary', but it takes so many time: [alarig@nominoe ~]$ time birdc show protocols all bgp_breizhix | grep 'Routes:' | sed -Ee '/preferred/{ s/^.* ([0-9]+) 'preferred'.*$/\1/; p;}' -e d 73 real 0m0.003s user 0m0.000s sys 0m0.006s [alarig@budic ~]$ time birdc -r show route count primary table master4 protocol bgp_breizhix_ipv4 | awk '/routes/ { print $1 }' 73 real 0m0.612s user 0m0.000s sys 0m0.003s Is there a faster manner to do this? My goal is to adapt https://git.grifon.fr/alarig/munin-bird/src/branch/master/bird_ to bird2. Thanks, -- Alarig

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show route export & not up proto
by Mikhail Mayorov 18 Nov '18

18 Nov '18

Hi all! How to display routes that will be exported to a specific peer (in my case it is BGP peer) if the session is not established? -- Regards, Mikhail V. Majorov

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