September 2016 - Bird-users

BIRD memory usage
by Justin Cattle 19 Sep '16

19 Sep '16

Hi, A colleague of mine reported a memory usage issue with the bird daemon last year, which resulted in a request for a core dump, but we never followed it up. I'd like to re-open this discussion and see if anything can be done to fix it. I'll provide some information regarding a production environment, where the problem is most obvious. But any further details and diagnostics will have to come from our lab environment. Please note, in production we mostly run 1.5, but in the lab we are on 1.6, however we see the same symptoms in both environments on both versions. The symptoms are twofold, but potentially related - greater than expected memory usage reported by the bird daemon itself for the number of routes, but also massively more memory actually used by the daemon process. When the process is started, we see "normal" memory usage, which then seems to grow indefinitely in distinct steps, separated by a period of a few hours. In production, this consumes most of the 32G of memory until the kernel oom-killer to intervenes. Production: BIRD 1.5.0 ready. bird> show memory BIRD memory usage Routing tables: 1405 MB Route attributes: 84 kB ROA tables: 192 B Protocols: 45 kB Total: 1405 MB bird> show route count 2273 of 2273 routes for 1142 networks # ps u -p 3441 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND bird 3441 0.1 55.4 18275124 18241540 ? Ssl Aug10 73:39 /usr/sbin/bird -f -u bird -g bird ..so that's ~1.4G reported by bird, and ~18G actually consumed by the process. Lab: BIRD 1.6.0 ready. bird> show mem BIRD memory usage Routing tables: 693 MB Route attributes: 28 kB ROA tables: 192 B Protocols: 41 kB Total: 693 MB bird> show route count 175 of 175 routes for 91 networks # ps u -p 29085 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND bird 29085 0.0 14.9 4994852 4915032 ? Ssl Aug05 19:41 /usr/sbin/bird -f -u bird -g bird ..so that's ~ 0.7G reported by bird, and ~5G actually consumed by the process. I also attached the bird config from the lab. Any help is much appreciated! Thanks. Cheers, Just -- Notice: This email is confidential and may contain copyright material of members of the Ocado Group. Opinions and views expressed in this message may not necessarily reflect the opinions and views of the members of the Ocado Group. If you are not the intended recipient, please notify us immediately and delete all copies of this message. Please note that it is your responsibility to scan this message for viruses. Fetch and Sizzle are trading names of Speciality Stores Limited and Fabled is a trading name of Marie Claire Beauty Limited, both members of the Ocado Group. References to the “Ocado Group” are to Ocado Group plc (registered in England and Wales with number 7098618) and its subsidiary undertakings (as that expression is defined in the Companies Act 2006) from time to time. The registered office of Ocado Group plc is Titan Court, 3 Bishops Square, Hatfield Business Park, Hatfield, Herts. AL10 9NE.

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[PATCH] Netlink: add krt_scope attribute
by Vincent Bernat 16 Sep '16

16 Sep '16

The general-purpose scope attribute is detailed in the documentation as an attribute that BIRD won't set and won't use. Therefore, to expose the scope of a kernel route, this commit adds a new attribute, krt_scope. Its possible values are the numeric values for SCOPE_* variables (1 is SCOPE_LINK for example), not the values from the kernel (253 is RT_SCOPE_LINK). Both import and export are supported. A typical use case is to install "scope link" routes for directly connected destinations, as the kernel won't accept routes with a broader scope when issuing an internal lookup. It would have been neat to be able to use "SCOPE_LINK" in a filter or to show "SCOPE_LINK" when displaying the route, but currently, only the numerical value can be used. Signed-off-by: Vincent Bernat <vincent(a)bernat.im> --- sysdep/linux/krt-sys.h | 1 + sysdep/linux/netlink.Y | 3 ++- sysdep/linux/netlink.c | 40 ++++++++++++++++++++++++++++++++++------ 3 files changed, 37 insertions(+), 7 deletions(-) diff --git a/sysdep/linux/krt-sys.h b/sysdep/linux/krt-sys.h index 96688e34c860..6d6586d10f02 100644 --- a/sysdep/linux/krt-sys.h +++ b/sysdep/linux/krt-sys.h @@ -36,6 +36,7 @@ static inline struct ifa * kif_get_primary_ip(struct iface *i) { return NULL; } #define EA_KRT_PREFSRC EA_CODE(EAP_KRT, 0x10) #define EA_KRT_REALM EA_CODE(EAP_KRT, 0x11) +#define EA_KRT_SCOPE EA_CODE(EAP_KRT, 0x12) #define KRT_METRICS_MAX 0x10 /* RTAX_QUICKACK+1 */ diff --git a/sysdep/linux/netlink.Y b/sysdep/linux/netlink.Y index a1c22f3ece17..c1c9503c33ec 100644 --- a/sysdep/linux/netlink.Y +++ b/sysdep/linux/netlink.Y @@ -10,7 +10,7 @@ CF_HDR CF_DECLS -CF_KEYWORDS(KERNEL, TABLE, METRIC, KRT_PREFSRC, KRT_REALM, KRT_MTU, KRT_WINDOW, +CF_KEYWORDS(KERNEL, TABLE, METRIC, KRT_PREFSRC, KRT_REALM, KRT_SCOPE, KRT_MTU, KRT_WINDOW, KRT_RTT, KRT_RTTVAR, KRT_SSTRESH, KRT_CWND, KRT_ADVMSS, KRT_REORDERING, KRT_HOPLIMIT, KRT_INITCWND, KRT_RTO_MIN, KRT_INITRWND, KRT_QUICKACK, KRT_LOCK_MTU, KRT_LOCK_WINDOW, KRT_LOCK_RTT, KRT_LOCK_RTTVAR, @@ -28,6 +28,7 @@ kern_sys_item: CF_ADDTO(dynamic_attr, KRT_PREFSRC { $$ = f_new_dynamic_attr(EAF_TYPE_IP_ADDRESS, T_IP, EA_KRT_PREFSRC); }) CF_ADDTO(dynamic_attr, KRT_REALM { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_KRT_REALM); }) +CF_ADDTO(dynamic_attr, KRT_SCOPE { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_ENUM_SCOPE, EA_KRT_SCOPE); }) CF_ADDTO(dynamic_attr, KRT_MTU { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_KRT_MTU); }) CF_ADDTO(dynamic_attr, KRT_WINDOW { $$ = f_new_dynamic_attr(EAF_TYPE_INT, T_INT, EA_KRT_WINDOW); }) diff --git a/sysdep/linux/netlink.c b/sysdep/linux/netlink.c index 9bdcc0d2ff19..9f73e0feeeaf 100644 --- a/sysdep/linux/netlink.c +++ b/sysdep/linux/netlink.c @@ -900,6 +900,15 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int op, int d r.r.rtm_dst_len = net->n.pxlen; r.r.rtm_protocol = RTPROT_BIRD; r.r.rtm_scope = RT_SCOPE_UNIVERSE; + if (ea = ea_find(eattrs, EA_KRT_SCOPE)) + switch (ea->u.data) + { + case SCOPE_HOST: r.r.rtm_scope = RT_SCOPE_HOST; break; + case SCOPE_LINK: r.r.rtm_scope = RT_SCOPE_LINK; break; + case SCOPE_SITE: r.r.rtm_scope = RT_SCOPE_SITE; break; + case SCOPE_UNIVERSE: r.r.rtm_scope = RT_SCOPE_UNIVERSE; break; + } + nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix); /* @@ -1157,7 +1166,6 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h) return; } - if (a[RTA_DST]) { memcpy(&dst, RTA_DATA(a[RTA_DST]), sizeof(dst)); @@ -1195,11 +1203,6 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h) if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK)) SKIP("strange class/scope\n"); - // ignore rtm_scope, it is not a real scope - // if (i->rtm_scope != RT_SCOPE_UNIVERSE) - // SKIP("scope %u\n", i->rtm_scope); - - switch (i->rtm_protocol) { case RTPROT_UNSPEC: @@ -1304,6 +1307,27 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h) return; } + int krt_scope = -1; + switch (i->rtm_scope) + { + case RT_SCOPE_HOST: krt_scope = SCOPE_HOST; break; + case RT_SCOPE_LINK: krt_scope = SCOPE_LINK; break; + case RT_SCOPE_SITE: krt_scope = SCOPE_SITE; break; + case RT_SCOPE_UNIVERSE: krt_scope = SCOPE_UNIVERSE; break; + } + if (krt_scope != -1) + { + ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr)); + ea->next = ra->eattrs; + ra->eattrs = ea; + ea->flags = EALF_SORTED; + ea->count = 1; + ea->attrs[0].id = EA_KRT_SCOPE; + ea->attrs[0].flags = 0; + ea->attrs[0].type = EAF_TYPE_INT; + ea->attrs[0].u.data = krt_scope; + } + if (a[RTA_PREFSRC]) { ip_addr ps; @@ -1633,6 +1657,10 @@ krt_sys_get_attr(eattr *a, byte *buf, int buflen UNUSED) bsprintf(buf, "realm"); return GA_NAME; + case EA_KRT_SCOPE: + bsprintf(buf, "scope"); + return GA_NAME; + case EA_KRT_LOCK: buf += bsprintf(buf, "lock:"); ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX); -- 2.9.3

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BGP, OSPF and Routing
by Robert Sander 16 Sep '16

16 Sep '16

Hi, I have two BIRD routers in two locations connected to the same CIX-LAN. Both establish BGP sessions to the route server of the CIX. Both routers do OSPF on their internal interfaces and see each other there (in area 0). How do I prevent the following situation: When I disable one of the BGP sessions to the route server the router still has direct routes into the CIX LAN because it learned them via OSPF from its partner. I would like to see the routes pointing to the router that still has the BGP sessions established (even if that means a hop more). Is that even possible? Do I really have to take down the interface to the CIX LAN? Regards -- Robert Sander Heinlein Support GmbH Schwedter Str. 8/9b, 10119 Berlin http://www.heinlein-support.de Tel: 030 / 405051-43 Fax: 030 / 405051-19 Zwangsangaben lt. §35a GmbHG: HRB 93818 B / Amtsgericht Berlin-Charlottenburg, Geschäftsführer: Peer Heinlein -- Sitz: Berlin

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[PATCH v3] IPv6 ECMP support fixes for linux v3
by Mikhail Sennikovskii 14 Sep '16

14 Sep '16

Hi all, Here is the third version of the Linux IPv6 ECMP support patch. In addition to v2 version, it fixes ECMP IPv6 route removal. The patch is against bird 1.6 version, but adopting to the int-new branch is strait-forward, and I could send the patch against it if the community wants to integrate it. Regards, Mikhail

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bird does not install route to the kernel
by Volodymyr Samodid 13 Sep '16

13 Sep '16

Hi community, i played with bird6 and ospf3 and faced with issue. In my schema bird does not install route to the kernel, but propagates route to another ospfv3 routers. That leads to routing loop. Here is simple schema: eth0 ------- R0 ------- eth1 ------- bridge ------ eth0 ------- R1 ospfv3 made adjacency R0 bird> show ospf neighbors TEST_OSPF: Router ID Pri State DTime Interface Router IP 198.51.100.11 1 Full/BDR 00:34 eth1 fe80::602c:e2ff:fe96:9c41 R1 bird> show ospf neighbors TEST_OSPF: Router ID Pri State DTime Interface Router IP 198.51.100.10 1 Full/DR 00:34 eth0 fe80::88e0:e3ff:fe08:7842 Now add ipv6 address to eth1 on R0 R0# ip a add 2001:DB8::1/64 dev eth1 on R1, got next bird> >>> TEST_OSPF > added [best] 2001:db8::/64 dev eth0 bird> show route 2001:db8::/64 dev eth0 [TEST_OSPF 13:58:11] * I (150/10) [198.51.100.11] R1# ip -6 ro s fe80::/64 dev eth0 proto kernel metric 256 pref medium added ipv6 address to eth0 on R0 R0# ip a add 2001:DB8:1::1/64 dev eth0 on R1 bird> >>> TEST_OSPF > added [best] 2001:db8:1::/64 via fe80::88e0:e3ff:fe08:7842 on eth0 >>> kernel1 < added 2001:db8:1::/64 via fe80::88e0:e3ff:fe08:7842 on eth0 bird> show route 2001:db8::/64 dev eth0 [TEST_OSPF 13:58:11] * I (150/10) [198.51.100.11] 2001:db8:1::/64 via fe80::88e0:e3ff:fe08:7842 on eth0 [TEST_OSPF 14:05:31] * I (150/20) [198.51.100.10] R1# ip -6 ro s 2001:db8:1::/64 via fe80::88e0:e3ff:fe08:7842 dev eth0 proto bird metric 1024 pref medium fe80::/64 dev eth0 proto kernel metric 256 pref medium R1## ip monitor route 2001:db8:1::/64 via fe80::88e0:e3ff:fe08:7842 dev eth0 proto bird metric 1024 pref medium I can add such route manual. R1# ip ro add 2001:db8::/64 dev eth0 -- С уважением, Самодед Владимир SVAJ-RIPE

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bird on Xenial doesn't restart after reboot
by Neil Jerram 12 Sep '16

12 Sep '16

Is this the right place to report and discuss an apparent bug with packaging in ppa:cz.nic-labs/bird ? If not, please advise where would be better. If it is the right place... I'd like to report that bird on Xenial doesn't restart after a reboot, using bird version 1.6.0-1+xenial+1 from http://ppa.launchpad.net/cz.nic-labs/bird/ubuntu xenial/main amd64. It appears the package is a bit inconsistent in its init system handling: - It installs init configuration files for SysV, upstart and systemd. - Its postinst (install-time) script calls 'update-rc.d bird defaults' and 'invoke-rc.d bird start'. On Xenial (which uses systemd), the invoke-rc.d call goes through to systemd - or at least, systemctl status bird indicates running after an 'invoke-rc.d bird start', and inactive after an 'invoke-rc.d bird stop' - but the update-rc.d call does not call on to 'systemctl enable bird'. Hence the observation that bird is not restarted on reboot. Thoughts? From analogy with other packages (that are systemd-enabled when installed), I think the fix may be as simple as: - adding '--with systemd' to the dh invocation - adding dh-systemd as a build dep. Thanks, Neil

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bgp : rejected by protocol
by Patrick Lamaiziere 05 Sep '16

05 Sep '16

Hello, I'm not sure to understand what "rejected by protocol" means. When a (bgp) route is updated on a bgp peer, bird learns the route and the route is then always rejected by protocol (bgp protocol). log: bgp_renater: Got UPDATE bgp_renater > added [best] 0.0.0.0/0 via 193.XX.XX.XX on ix0 bgp_renater < rejected by protocol 0.0.0.0/0 via 193.XX.XX.XX on ix0 config: protocol static routes_renater { table Trenater; route 129.20.0.0/16 via 129.20.252.1; ... } # peer BGP RENATER protocol bgp bgp_renater from bgptemplate { table Trenater; description "RenaterV4"; neighbor 193.XX.XX.XX as 2200; export filter { if proto != "routes_renater" then reject; accept; }; import filter fbgp_renater_in; } Thanks, regards.

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[PATCH] birdc: wider columns in show protocol output
by Simon Ruderich 01 Sep '16

01 Sep '16

-- Hello, The show protocol output gets more difficult to read with longer protocol names. This patch increases the column width to 15 characters. Regards Simon Index: bird-1.6.0/nest/proto.c =================================================================== --- bird-1.6.0.orig/nest/proto.c +++ bird-1.6.0/nest/proto.c @@ -1498,13 +1498,13 @@ proto_cmd_show(struct proto *p, uint ver /* First protocol - show header */ if (!cnt) - cli_msg(-2002, "name proto table state since info"); + cli_msg(-2002, "name proto table state since info"); buf[0] = 0; if (p->proto->get_status) p->proto->get_status(p, buf); tm_format_datetime(tbuf, &config->tf_proto, p->last_state_change); - cli_msg(-1002, "%-8s %-8s %-8s %-5s %-10s %s", + cli_msg(-1002, "%-15s %-8s %-8s %-5s %-10s %s", p->name, p->proto->name, p->table->name, -- + privacy is necessary + using gnupg http://gnupg.org + public key id: 0x92FEFDB7E44C32F9

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How to make a aggregate function in bird ?
by Xavier Beaudouin 01 Sep '16

01 Sep '16

Hello, I am attempting to make some intelligent stuff on one lab bird. I am sorry if this has been already asked since I do not have very mutch experience about bird, and some of my google:// didn't find what I am looking for. My idea is to find which aggregate I have within a bunch of subnet I have. For example : get_aggregate( 192.0.2.1/32 ) will return 192.0.2.0/24 Is there any nice way to make such function ? Also in the same work I would like to find how old is the route received in BGP. Any good pointers or examples are really appreciated. Kind regards, Xavier

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