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Re: bird6 segfault
by Ondrej Zajicek 31 May '10

31 May '10

On Mon, May 31, 2010 at 09:05:40AM +0200, Arjan Filius wrote: > Hello Ondrej, bird-users, > > An updated report, and a bird6 with debug info included. > posted as html to prevent wrapping. Thanks, the problem found. We will fix it in the next release. -- Elen sila lumenn' omentielvo Ondrej 'SanTiago' Zajicek (email: santiago(a)crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."

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bird6 segfault
by Arjan Filius 29 May '10

29 May '10

Hello, Starting to configure bird6 for iBGP and ran in a repeatable crash running 1.2.2 from ppa on ubuntu 10.04 LTS x64. as soon as i configure in a protocol bgp it's neighbor like: neighbor 2A00:1388:FFFF::3 as MYAS; bird6 crashes i unset the ulimit core to produce a core file, but no debugging info is included: # gdb `which bird6` core GNU gdb (GDB) 7.1-ubuntu Copyright (C) 2010 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-linux-gnu". For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>... Reading symbols from /usr/sbin/bird6...(no debugging symbols found)...done. [New Thread 16308] warning: Can't read pathname for load map: Input/output error. Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done. Loaded symbols for /lib/librt.so.1 Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done. Loaded symbols for /lib/libc.so.6 Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)...done. Loaded symbols for /lib/libpthread.so.0 Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done. Loaded symbols for /lib64/ld-linux-x86-64.so.2 Core was generated by `bird6'. Program terminated with signal 11, Segmentation fault. #0 0x00007f4c985bddd5 in ?? () (gdb) bt #0 0x00007f4c985bddd5 in ?? () #1 0x00007f4c985be22f in ?? () #2 0x00007f4c9859ec33 in ?? () #3 0x00007f4c98596850 in ?? () #4 0x00007f4c985bc447 in ?? () #5 0x00007f4c985be458 in ?? () #6 0x00007f4c985c1cec in main () (gdb) network on the interface is: 2a00:1388:ffff::2/124 as soon i change the IP a little so it leaves the /124 it doesn't crash anymore. i've a succesfull eBGP setup. Now to try to debug the situation i tried to compile a 1.2.2 ipv6 version from source, but i run stuck at the moment: ran: bird-1.2.2# ./configure --sysconfdir=/ --enable-debug --enable-ipv6 checking for gcc... gcc checking for C compiler default output file name... a.out checking whether the C compiler works... yes checking whether we are cross compiling... no checking for suffix of executables... checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether gcc accepts -g... yes checking for gcc option to accept ISO C89... none needed checking for library containing clock_gettime... -lrt checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking for gcc... (cached) gcc checking whether we are using the GNU C compiler... (cached) yes checking whether gcc accepts -g... (cached) yes checking for gcc option to accept ISO C89... (cached) none needed checking what CFLAGS should we use... -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign checking how to run the C preprocessor... gcc -E checking for a BSD-compatible install... /usr/bin/install -c checking for ranlib... ranlib checking for flex... flex checking for bison... bison checking for gm4... no checking for m4... m4 checking Linux kernel version... VERSION: UTS_RELEASE checking which OS configuration should we use... ./sysdep/cf/linux-v6.h checking system-dependent directories... sysdep/linux/netlink sysdep/linux sysdep/unix lib checking protocols... ok checking for linux/rtnetlink.h... yes checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking syslog.h usability... yes checking syslog.h presence... yes checking for syslog.h... yes checking alloca.h usability... yes checking alloca.h presence... yes checking for alloca.h... yes checking whether 'struct sockaddr' has sa_len... no checking whether byte ordering is bigendian... no checking for char... yes checking size of char... 1 checking for short int... yes checking size of short int... 2 checking for int... yes checking size of int... 4 checking for long int... yes checking size of long int... 8 checking for 8-bit type... char checking for 16-bit type... short int checking for 32-bit type... int checking usual alignment of structures... 16 checking characteristics of time_t... 64-bit signed checking for struct ip_mreqn... yes checking for dmalloc_debug in -ldmalloc... no checking for malloc in -lefence... no checking for add_history in -lhistory... yes checking for tgetent in -lncurses... yes checking for rl_callback_read_char in -lreadline... yes checking for rl_crlf in -lreadline... yes checking for rl_ding in -lreadline... yes configure: creating ./config.status config.status: creating Makefile config.status: creating obj/Makefile config.status: creating obj/Rules config.status: creating obj/sysdep/autoconf.h config.status: obj/sysdep/autoconf.h is unchanged config.status: executing merge commands Merging system-dependent modules (sysdep/linux/netlink sysdep/linux sysdep/unix lib) BIRD was configured with the following options: Source directory: . Object directory: obj System configuration: ./sysdep/cf/linux-v6.h Debugging: yes Routing protocols: bgp ospf pipe rip static Client: yes bird-1.2.2# make make -C obj all make[1]: Entering directory `/root/arfi/src/bird-1.2.2/obj' make depend make[2]: Entering directory `/root/arfi/src/bird-1.2.2/obj' mkdir -p nest filter proto/bgp proto/ospf proto/pipe proto/rip proto/static client doc touch .dir-stamp set -e ; for a in lib conf ; do make -C $a depend ; done make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/lib' gcc -I../ -I../.. -MM bitops.c checksum.c event.c io.c ip.c ipv6.c krt.c lists.c log.c main.c md5.c mempool.c netlink.c patmatch.c printf.c random.c resource.c slab.c slists.c xmalloc.c >depend make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/lib' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/conf' m4 -P ../../conf/gen_keywords.m4 ../../conf/confbase.Y ../../sysdep/unix/config.Y ../../sysdep/unix/krt.Y ../../sysdep/linux/netlink/netlink.Y ../../nest/config.Y ../../filter/config.Y ../../proto/bgp/config.Y ../../proto/ospf/config.Y ../../proto/pipe/config.Y ../../proto/rip/config.Y ../../proto/static/config.Y >keywords.h m4 -P ../../conf/gen_commands.m4 ../../client/cmds.m4 ../../conf/confbase.Y ../../sysdep/unix/config.Y ../../sysdep/unix/krt.Y ../../sysdep/linux/netlink/netlink.Y ../../nest/config.Y ../../filter/config.Y ../../proto/bgp/config.Y ../../proto/ospf/config.Y ../../proto/pipe/config.Y ../../proto/rip/config.Y ../../proto/static/config.Y | sort >commands.h m4 -P ../../conf/gen_parser.m4 ../../conf/confbase.Y ../../sysdep/unix/config.Y ../../sysdep/unix/krt.Y ../../sysdep/linux/netlink/netlink.Y ../../nest/config.Y ../../filter/config.Y ../../proto/bgp/config.Y ../../proto/ospf/config.Y ../../proto/pipe/config.Y ../../proto/rip/config.Y ../../proto/static/config.Y >cf-parse.y bison -bcf-parse -dv -pcf_ cf-parse.y flex -s -B -8 -ocf-lex.c -Pcf_ cf-lex.l gcc -I../ -I../.. -MM cf-parse.tab.c cf-lex.c conf.c >depend make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/conf' set -e ; for a in nest filter proto/bgp proto/ospf proto/pipe proto/rip proto/static client ; do make -C $a -f /root/arfi/src/bird-1.2.2/$a/Makefile depend ; done make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/nest' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/nest' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/filter' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/filter' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/proto/bgp' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/proto/bgp' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/proto/ospf' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/proto/ospf' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/proto/pipe' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/proto/pipe' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/proto/rip' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/proto/rip' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/proto/static' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/proto/static' make[3]: Entering directory `/root/arfi/src/bird-1.2.2/obj/client' make[3]: `depend' is up to date. make[3]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/client' make[2]: Leaving directory `/root/arfi/src/bird-1.2.2/obj' touch .dep-stamp set -e ; for a in lib conf ; do make -C $a subdir ; done make[2]: Entering directory `/root/arfi/src/bird-1.2.2/obj/lib' gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o bitops.o -c bitops.c gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o checksum.o -c checksum.c gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o event.o -c event.c event.c: In function âev_run_listâ: ../lib/lists.c:132: warning: dereferencing pointer â({anonymous})â does break strict-aliasing rules ../lib/lists.c:115: note: initialized from here gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o io.o -c io.c io.c: In function âsysio_process_rx_cmsgsâ: io.c:704: error: dereferencing pointer to incomplete type io.c:705: error: dereferencing pointer to incomplete type io.c: In function âsk_readâ: io.c:1380: error: invalid application of âsizeofâ to incomplete type âstruct in6_pktinfoâ make[2]: *** [io.o] Error 1 make[2]: Leaving directory `/root/arfi/src/bird-1.2.2/obj/lib' make[1]: *** [subdir] Error 2 make[1]: Leaving directory `/root/arfi/src/bird-1.2.2/obj' make: *** [all] Error 2 bird-1.2.2# Tried the ppa-source too, but same result. Anyone an idea: 1)what may go wrong causing the bird6 crash on startup? 2) what to do to get bird compiled from source. Thanks in advance. -- Arjan Filius mailto:iafilius@xs4all.nl

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Compiling for IPv6
by Simone Morandini 28 May '10

28 May '10

Hi all, I'd like to set up an IPv6 instance of BIRD for our members, but I'm having some troubles with "make". When I issue "./configure --enable-ipv6" everything goes fine, but the subsequent "make" at a certain poing gives these errors: [...] gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o bitops.o -c bitops.c gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o checksum.o -c checksum.c gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o event.o -c event.c event.c: In function ‘ev_run_list’: ../lib/lists.c:132: warning: dereferencing pointer ‘({anonymous})’ does break strict-aliasing rules ../lib/lists.c:115: note: initialized from here gcc -I../ -I../.. -g -O2 -Wall -Wstrict-prototypes -Wno-parentheses -Wno-pointer-sign -o io.o -c io.c io.c: In function ‘sysio_process_rx_cmsgs’: io.c:704: error: dereferencing pointer to incomplete type io.c:705: error: dereferencing pointer to incomplete type io.c: In function ‘sk_read’: io.c:1380: error: invalid application of ‘sizeof’ to incomplete type ‘struct in6_pktinfo’ make[2]: *** [io.o] Error 1 make[2]: Leaving directory `/usr/local/src/bird-1.2.2/obj/lib' make[1]: *** [subdir] Error 2 make[1]: Leaving directory `/usr/local/src/bird-1.2.2/obj' make: *** [all] Error 2 [root@rs1 bird-1.2.2]# On the same machine BIRD compiles successfully without the v6 option. Am I missing something basic here? The box runs on a Fedora 12. Thanks a lot, Simone. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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showing pre/post imported routes?
by Arjan Filius 27 May '10

27 May '10

Hello bird-users, many thanks for the previous answers, but yet another question running bird 1.2.2 In order to prepare for running production, i try to check and see if "everything" is ok. advertized routes by my AS are easely showed with: show route preexport <BGPprotocol> [count] show route export <BGPprotocol> [count] which lets mee see easy what i propagate, and what i filter. now the oposite seems not so easy. i can use a : show route protocol <BGPprotocol> [count] but here is no pre/post (import) option. it is possible to apply a filter like: show route protocol <BGPprotocol> filter <the applied filter> but in this case i've used a function, and it seemes no function is allowed as filter option. Can this be done? Thanks, -- Arjan Filius mailto:iafilius@xs4all.nl

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input filter function <NULL>
by Arjan Filius 27 May '10

27 May '10

Hello bird-users, another question, using bird 1.2.2 defined a function: function bgp_in(int peeras) { # enforce the presence of the peer AS as the first AS of the path if !(bgp_path.first = peeras) then return false; # basic sanity checks if (invalid_prefix()) then return false; return true; } invalid_prefix() is another function started to use the function like: # definition define MYNEIGBORDEFINITIONAS = xxxx; in the bgp protocol definition: import where bgp_in(MYNEIGBORDEFINITIONAS); export filter bgp_out; now, when i do a "birdc# show protocols all" i see a: Input filter: <NULL> Output filter: bgp_out I wasn't expecting a <NULL> here. Is that usual for a function in import, or is it because i do something wrong? Thanks in advance, -- Arjan Filius mailto:iafilius@xs4all.nl

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Adding and deleting communities...
by Simone Morandini 26 May '10

26 May '10

Hi all, I need your help to understand what I'm missing... One of the rs clients sends a route with no-export community, so I have to strip it on ingress and re-attach it on egress. I thought I have two alternatives: using "interpret community no" in the bgp table of the peer, or playing with bgp_community.add and delete. I would expect to receive a "duplicate" network on my peering router, one learned via the direct peering and one learned via the route server. So far I only see the network from the direct peering. Relevant part of the config file: protocol pipe P_MYPEER { table master; mode transparent; peer table T_MYPEER; export where bgp_out(<mypeer>) = true; import where bgp_mypeer_in(<mypeer>) = true; } in the bgp_mypeer_in function, after checking that it is a legitimate network for that peer, I added: bgp_community.delete ((65535, 65281)); just before the final "return true". in the bgp_out function, after checking if a filtering community is set, I added: if (bgp_path.first = <mypeer>) then bgp_community.add ((65535, 65281)); just before the final "return true". I also set "interpret community no" in protocol bgp MYPEER. If I issue a "show route where bgp_path.first=<my-peer> all" I see that the no-export community is actually being stripped, but I still see one network on my peering router (sh ip bgp regexp ^<mypeer>, via the direct peering). TIA for any help, Simone. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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choice version (ubuntu 10.04 LTS) native or ppa/latest greatest ?
by Arjan Filius 25 May '10

25 May '10

Hello, i'm configuring 2 ubuntu 10.05 LTS bgp (production) servers for eBGP/iBGP standard bird version is : 1.1.5-1 i saw there are quite some newer version already, and even a ppa version is created on https://launchpad.net/~ondrej/+archive/bird latest version there 1.2.2-1~lucid+1 which is also the latest on bird.network.cz. as the 1.1.5-1 is almost a year old i can imagine it is preferred to have a later version installed. has anyone an (strong) opininion/advice what to take for a new bgp setup? Regards, -- Arjan Filius mailto:iafilius@xs4all.nl

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iBGP over redundant link/ospf and dummy interface
by Arjan Filius 25 May '10

25 May '10

Hello bird users. new on the list. What i like to do is a bird (linux) doing iBGP with another bird bgp router, direct connected with 2 links (for redundancy) until now, i wanted to do this with a single iBGP session to/from IP's configured on a dummy(loopback) interface, and let a simple ospf handle this. iBGP should then become multihop, and there starts my trouble. My gateway (neigbour iBGP) is dynamic (ospf) and bird likes to have a predefined one. My questions: 1)am i on the right track with ospf handling the local redundancy/routing ? 2)or is it perhaps a better idea to have to iBGP sessions over both (redundant) links ? Another question, not related. this morning i found my disk full (bird debug logging), and noticed my ubuntu 10.04 TLS didn't handle that. is there a preferred way to handle logrotte/reopen logfiles without any change distubing the bird/bgp proces? Regards, and thanks in advance. -- Arjan Filius mailto:iafilius@xs4all.nl

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rpsltool templates for BIRD route servers
by md＠Linux.IT 24 May '10

24 May '10

I released a new version of rpsltool[1] which contains an example configuration file and template for generating the complete configuration of a BIRD route server. (There is an OpenBGPd template as well, does anybody want to contribute one for quagga?) It has been used in production at MINAP[2] for more than one month, and at least by another IX as well. rpsltool is a program which can be used to generate the complete BGP configuration of a router using a template, a configuration file containing the list of peers (in YAML, a simple and human-readable serialization format) and IRR data. It is usually used to generate the BGP configuration and filters of IX peerings sessions, but it can used for customer sessions or a route server as well. Just like irrtoolset, except that it is made of 1500 lines of perl instead of tens of thousands of C++. [1] http://www.linux.it/~md/software/rpsltool-1.5.tgz [2] http://www.minap.it/ the other IX in Milano -- ciao, Marco

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BIRD OSPF floods illegal LSA seq no 0x80000000 after premature aging
by Dennis Koegel 24 May '10

24 May '10

Cheers, we have reproducible case in the lab where BIRD's OSPF sends LSUPDs with illegal sequence number 0x80000000. Here's what happens: - The OSPF is up and running fine, including BIRD - A change to bird.conf is made that affects OSPF routes - BIRD receives a SIGHUP - Apparently as part of reconfiguration, BIRD floods LSAs with MaxAge and MaxSequenceNumber 0x7fffffff (premature aging -- so far ok) - Immediately after that, but before any other OSPF packet is received (!), BIRD floods the same LSAs again, but with an Age of 2 or 3 (NOT MaxAge) and sequence number 0x80000000 We have a capture file (pcap) of this. If this is any help, I'm happy to e-mail it. The bug here is that sequence number 0x80000000 is reserved and not to be used (RFC 2328, section 12.1.6). As far as I can see, originate_ext_lsa() is called and simply looks up a matching entry in its database (*en). It finds the previously- originated entry with 0x7fffffff, blindly increments it to 0x80000000 (proto/ospf/topology.c:990) and then floods it.

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