August 2022 - Bird-users

[PATCH] Bus error on ARMv7 when using OSPF
by Matthew Reeve 18 Dec '24

18 Dec '24

Hi, when using bird 2.0.8 on openwrt 21.02 (and other versions) on a Netgear R7800 router, if the OSPF protocol is used, either v2 or v3, bird immediately crashes on startup with: Fri Jun 11 14:41:11 2021 daemon.info bird: Started Fri Jun 11 14:41:11 2021 kern.err kernel: [ 3500.853248] Alignment trap: not handling instruction f44c0a1f at [<00035848>] Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.853283] 8<--- cut here --- Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.859363] Unhandled fault: alignment exception (0x801) at 0x007e0624 Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.862443] pgd = 0bbef4fd Fri Jun 11 14:41:11 2021 kern.alert kernel: [ 3500.868821] [007e0624] *pgd=5d6ca835, *pte=5c40b75f, *ppte=5c40bc7f This router uses an ARMv7 processor and the issue seems to be to do with memory alignment issues. I've debugged it and traced it to an access to the top_hash_entry struct. I've found that if I add the PACKED macro to the struct definition then it fixes the problem, as per this patch: --- a/proto/ospf/topology.h +++ b/proto/ospf/topology.h @@ -41,7 +41,7 @@ struct top_hash_entry u8 mode; /* LSA generated during RT calculation (LSA_RTCALC or LSA_STALE)*/ u8 nhs_reuse; /* Whether nhs nodes can be reused during merging. See a note in rt.c:add_cand() */ -}; +} PACKED; /* Prevents ospf_hash_find() to ignore the entry, for p->lsrqh and p->lsrth */ Thanks.

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logging via udp
by Alexander Zubkov 13 Dec '23

13 Dec '23

Hello, Made some dirty patch for myself to allow bird to send logs via udp. But it may be useful not only for me, so posting it here. It could be useful when server experiencing high IO-load. As syslog and file operations in bird are blocking, it can be blocked on writing to it for indefinite time, which could lead to various problems like protocol timeouts. So udp logging comes in handy here. The tradeoff is that we can miss some logs if they are not processed in time. You can specify udp log destination like that: log udp [host IP|"hostname"] [port NUMBER|"portname"] ... By default it uses destination ip 127.0.0.1 and port 514. There are some constraints like not much error handling. And this destination replaces file destination, i.e. you can not use those simultaneously and it may leak descriptors and some memory probably if both are specified. It also makes a new socket every time configuration is reloaded even if there is no change in options, but this is not a great deal.

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BIRD show bgp summary for cli
by Roman Bulakh 14 Jun '23

14 Jun '23

Hi, we use BIRD in our environment, and it would be very nice to have some command like `show bgp summary` in juniper. This command show information about peer IP, peer AS, last update, prefixes received/best/exported and last state. Example: bird> show bgp summary Peer AS Last state change Prfx rcvd/best/export State X.X.X.X asXXXX 2021-01-27 6786/6785/109000 Established Y.Y.Y.Y asYYYY 2020-12-16 0/0/0 Passive BGP Error: Hold timer expired The are patch created for BIRD 1.3.4 and 1.3.6, but it would be good to have this in upstream software, without rebuilding and patching. as I understand it, no functionality should be affected by these changes, this is only a visual update for cli. Old patches describes at pages: https://marc.info/?l=bird-users&m=132155489919052&w=2 http://trubka.network.cz/pipermail/bird-users/attachments/20120228/a1499be7… https://bird-users.network.narkive.com/Px6EH3yl/bird-1-3-6-show-bgp-summary…

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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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Expiration for ROA tables until when the VRP is valid?
by Robert Scheck 07 Mar '23

07 Mar '23

Hello all, rpki-client recently implemented the "expires" instruction for roa-sets that OpenBGPD provides [1][2]. As of writing, BIRD does not seem to have something similar...any chance for it? From my understanding this only applies to included ROA files with VRP, not to RTR. [1] https://man.openbsd.org/bgpd.conf#roa-set [2] https://github.com/rpki-client/rpki-client-openbsd/commit/7bf63da6ec80f37bd… Kind regards Robert Scheck

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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.

3 16

BIRD Crashes
by Ian Chilton 04 Oct '22

04 Oct '22

Hi, We are an IXP running 2x route servers with BIRD, each running separate daemons for IPv4 and IPv6. We are running BIRD 2.0.8-1 on Debian 10 and have around 250 peers, ~150k routes on v4 and ~50k routes on v6. Since upgrading to BIRD 2 nearly 3 years ago, it was really stable until May this year. Since then we've had 3 crashes of the daemon for v4 on one of the servers. The v6 daemon on that server has been fine, as has the second route server, running the same, with the same peers and therefore in theory, the same routes. The first two of these crashes happened a week apart, after which I rebooted the VM to ensure everything was clean and it was fine for 90 days, but then did the same yesterday. Our BIRD configuration is generated by IXP Manager and updated hourly. We then run a "bird re-validate" cron job every hour (at twenty past the hour): /usr/sbin/birdc -s /run/bird-ipv6.ctl reload in all > /dev/null ; /usr/sbin/birdc -s /run/bird-ipv4.ctl reload in all Interestingly all 3 crashes have happened at just after twenty past the hour, i.e soon after this cron job has run. It looks like the following in the logs: Aug 17 17:20:01 rs1 CRON[29229]: (root) CMD (/usr/sbin/birdc -s /run/bird-ipv6.ctl reload in all > /dev/null ; /usr/sbin/birdc -s /run/bird-ipv4.ctl reload in all > /dev/null) Aug 17 17:20:01 rs1 bird: Reloading protocol device1 Aug 17 17:20:01 rs1 bird: Reloading protocol pp_0121_asxx ..etc.. Aug 17 17:20:01 rs1 bird: Reloading protocol pp_1082_asxxxxxx Aug 17 17:20:01 rs1 bird: Reloading protocol pb_1082_asxxxxxx Aug 17 17:20:01 rs1 bird: Tagging invalid ROA 2001:xxxx:xxxx::/48 for ASN xxxxx ..etc.. Aug 17 17:21:17 rs1 bird: Tagging invalid ROA x.x.x.x/23 for ASN xxxx Aug 17 17:21:19 rs1 kernel: [7811815.959943] bird[586]: segfault at f30021 ip 000055a1bf450fc3 sp 00007ffe64f3da98 error 4 in bird[55a1bf42a000+d8000] Aug 17 17:21:19 rs1 kernel: [7811815.966760] Code: 95 78 01 00 00 5b 5d 41 5c c3 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 48 85 ff b8 01 00 00 00 74 15 48 85 f6 0f 84 a6 00 00 00 <0f> b6 46 21 0f b6 57 21 29 d0 74 11 f3 c3 0f 1f 44 00 00 66 2e 0f Aug 17 17:21:19 rs1 systemd[1]: bird-ipv4.service: Main process exited, code=killed, status=11/SEGV Aug 17 17:21:19 rs1 systemd[1]: bird-ipv4.service: Failed with result 'signal'. Aug 17 17:21:19 rs1 systemd[1]: bird-ipv4.service: Service RestartSec=100ms expired, scheduling restart. Aug 17 17:21:19 rs1 systemd[1]: bird-ipv4.service: Scheduled restart job, restart counter is at 1. Aug 17 17:21:19 rs1 systemd[1]: Stopped BIRD - ipv4. Aug 17 17:21:19 rs1 systemd[1]: Starting BIRD - ipv4... Aug 17 17:21:22 rs1 systemd[1]: Started BIRD - ipv4. Aug 17 17:21:22 rs1 bird: Started When the second crash happened, we happened to be at RIPE84 so we chatted to Maria in person. She said that it was possible to debug it, but would need a core dump. After looking in to this, I did: ulimit -S -c unlimited and installed the systemd-coredump package. ...which was supposed to dump a core file if a process crashed. I tested this by killing a sleep command from the shell with kill -s 6 and it worked. When the crash happened again yesterday, I hoped to have a core file to send, but there is no sign of it having generated one :( Testing on a test server, killing sleep generates a core file, but not killing bird. So two things - has anyone experienced similar crashes or have any ideas why we might be seeing this? Can anyone advise how to reliably get a core dump if bird crashes? Thanks! Ian

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bind RIP protocol to specified address
by Ivan 25 Aug '22

25 Aug '22

Hi all. I use bird2 (2.0.7) on linux, I want to configure the RIP protocol so that it uses the specified source address. I have two addresses assigned on the network interface, for example 192.0.2.1/32 and 198.51.100.1/31. bird chooses 192.0.2.1 as the source address, but I want the source address to be 198.51.100.1. How do I set the source address for the RIP protocol ? Thank you.

2 1

v2.0.10 for bullseye-backports?
by Christoph 15 Aug '22

15 Aug '22

Hi, are there any plans to update bird2 in debian backports from 2.0.8 to 2.0.10? thanks! Christoph

3 2

OSPF default metric
by Marcus Büttemeyer 11 Aug '22

11 Aug '22

Hello again, I'm wondering how OSPF default metrics are calculated by BIRD? Background: I'm running 4 Linux VMs with BIRD under Hyper-V and BIRD gives me a metric of 10 for every connection, be it 10G (which seems to be the default for vSwitches on Hyper-V), 1G or wireless. Even though the physical speed is passed from the hypervisor to the VMs. At least "cat /sys/class/net/INT/speed" gives the proper value. If I knew where the metric comes from, I could try to fix that on the OS-level and save myself separate cost definitions for every interface. Thanks in advance, Marcus Büttemeyer

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